Merge remote-tracking branch 'remotes/origin/trz/rename' into trz/rebase

62 files changed, 2900 insertions, 143 deletions

diff --git a/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java b/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java
index 4b11bb4a..fb1e9392 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java
@@ -3,15 +3,25 @@ package de.thedevstack.conversationsplus;
 import android.app.Application;
 import android.content.Context;
 import android.content.pm.PackageManager;
+import android.os.PowerManager;
 import android.preference.PreferenceManager;
 
 import java.io.File;
+import java.security.SecureRandom;
 
+import de.duenndns.ssl.MemorizingTrustManager;
+import de.thedevstack.conversationsplus.http.HttpClient;
 import de.thedevstack.conversationsplus.utils.ImageUtil;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferManager;
+import de.thedevstack.conversationsplus.services.filetransfer.http.upload.HttpUploadFileTransferService;
+import de.thedevstack.conversationsplus.services.filetransfer.jingle.JingleFileTransferService;
 
 import eu.siacs.conversations.R;
+import eu.siacs.conversations.http.HttpConnectionManager;
+import eu.siacs.conversations.utils.PRNGFixes;
 import eu.siacs.conversations.persistance.FileBackend;
 import eu.siacs.conversations.utils.SerialSingleThreadExecutor;
+import okhttp3.OkHttpClient;
 
 /**
  * This class is used to provide static access to the applicationcontext.
@@ -25,6 +35,9 @@ public class ConversationsPlusApplication extends Application {
     private final SerialSingleThreadExecutor mFileAddingExecutor = new SerialSingleThreadExecutor();
     private final SerialSingleThreadExecutor mDatabaseExecutor = new SerialSingleThreadExecutor();
 
+    private MemorizingTrustManager memorizingTrustManager;
+    private SecureRandom secureRandom;
+
     /**
      * Initializes the application and saves its instance.
      */
@@ -32,8 +45,21 @@ public class ConversationsPlusApplication extends Application {
         super.onCreate();
         ConversationsPlusApplication.instance = this;
         ConversationsPlusPreferences.init(PreferenceManager.getDefaultSharedPreferences(getAppContext()));
+        this.initializeSecurity();
         ImageUtil.initBitmapCache();
         FileBackend.init();
+        FileTransferManager.init(new HttpUploadFileTransferService(), new JingleFileTransferService());
+        HttpConnectionManager.init();
+        HttpClient.init();
+    }
+
+    /**
+     * Initializes security features.
+     */
+    private void initializeSecurity() {
+        PRNGFixes.apply();
+        this.secureRandom = new SecureRandom();
+        ConversationsPlusApplication.updateMemorizingTrustmanager();
     }
 
     /**
@@ -102,4 +128,36 @@ public class ConversationsPlusApplication extends Application {
     public static String getNameAndVersion() {
         return getName() + " " + getVersion();
     }
+
+    public static PowerManager.WakeLock createPartialWakeLock(String name) {
+        PowerManager powerManager = (PowerManager) getAppContext().getSystemService(Context.POWER_SERVICE);
+        return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, name);
+    }
+
+    public static MemorizingTrustManager getMemorizingTrustManager() {
+        return getInstance().memorizingTrustManager;
+    }
+
+    public void setMemorizingTrustManager(MemorizingTrustManager trustManager) {
+        this.memorizingTrustManager = trustManager;
+    }
+
+    public static void updateMemorizingTrustmanager() {
+        final MemorizingTrustManager tm;
+        if (ConversationsPlusPreferences.dontTrustSystemCAs()) {
+            tm = new MemorizingTrustManager(getAppContext(), null);
+        } else {
+            tm = new MemorizingTrustManager(getAppContext());
+        }
+        getInstance().setMemorizingTrustManager(tm);
+    }
+
+    private static void initHttpClient() {
+        OkHttpClient client = new OkHttpClient.Builder()
+                .build();
+    }
+
+    public static SecureRandom getSecureRandom() {
+        return getInstance().secureRandom;
+    }
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/dto/RemoteFile.java b/src/main/java/de/thedevstack/conversationsplus/dto/RemoteFile.java
new file mode 100644
index 00000000..58b64b28
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/dto/RemoteFile.java
@@ -0,0 +1,37 @@
+package de.thedevstack.conversationsplus.dto;
+
+import android.support.annotation.NonNull;
+
+import java.io.Serializable;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public class RemoteFile implements Serializable {
+    private static final long serialVersionUID = 34564871234564L;
+    private final String path;
+
+    public RemoteFile(@NonNull String path) {
+        this.path = path;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        RemoteFile that = (RemoteFile) o;
+
+        return path.equals(that.path);
+
+    }
+
+    @Override
+    public int hashCode() {
+        return path.hashCode();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/entities/FileParams.java b/src/main/java/de/thedevstack/conversationsplus/entities/FileParams.java
new file mode 100644
index 00000000..1eef078f
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/entities/FileParams.java
@@ -0,0 +1,130 @@
+package de.thedevstack.conversationsplus.entities;
+
+import de.thedevstack.conversationsplus.enums.FileStatus;
+
+import eu.siacs.conversations.utils.MimeUtils;
+
+/**
+ *
+ */
+public class FileParams {
+    private String name;
+    private String path;
+    private String url;
+    private String mimeType;
+    private long size = 0;
+    private int width = 0;
+    private int height = 0;
+    private FileStatus fileStatus;
+
+    public FileParams() {
+        fileStatus = FileStatus.UNDEFINED;
+    }
+
+    public FileParams(String url) {
+        this();
+        this.url = url;
+    }
+
+    public FileParams(String url, long size) {
+        this(url);
+        this.size = size;
+    }
+
+    public FileParams(String url, long size, int width, int height) {
+        this(url, size);
+        this.width = width;
+        this.height = height;
+    }
+
+    public String getUrl() {
+        return url;
+    }
+
+    public void setUrl(String url) {
+        this.url = url;
+    }
+
+    public long getSize() {
+        return size;
+    }
+
+    public void setSize(long size) {
+        this.size = size;
+    }
+
+    public int getWidth() {
+        return width;
+    }
+
+    public void setWidth(int width) {
+        this.width = width;
+    }
+
+    public int getHeight() {
+        return height;
+    }
+
+    public void setHeight(int height) {
+        this.height = height;
+    }
+
+    public String getMimeType() {
+        return mimeType;
+    }
+
+    public void setMimeType(String mimeType) {
+        this.mimeType = mimeType;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getPath() {
+        return path;
+    }
+
+    /**
+     * Sets the path to the file.
+     * If no file name is stored yet here - this method tries to extract the file name from the path.
+     * If the file name is stored here and the path does not end with the name - the name is appended to the path.
+     * @param path the path to be stored
+     */
+    public void setPath(String path) {
+        if (null != path) {
+            if (null != this.name) {
+                path = (!path.endsWith(this.name)) ? path + "/" + this.name : path;
+            } else {
+                if (!path.endsWith("/")) {
+                    this.setName(path.substring(path.lastIndexOf('/') + 1));
+                }
+            }
+            if (null == this.mimeType) {
+                int start = path.lastIndexOf('.') + 1;
+                if (start < path.length()) {
+                    String extension = path.substring(start);
+                    this.mimeType = MimeUtils.guessMimeTypeFromExtension(extension);
+                }
+            }
+        }
+
+        this.path = path;
+    }
+
+    public boolean isRemoteAvailable() {
+        return null != this.url || FileStatus.UPLOADED == this.fileStatus || FileStatus.DELETE_FAILED == this.fileStatus;
+    }
+
+    public void setFileStatus(FileStatus fileStatus) {
+        this.fileStatus = fileStatus;
+    }
+
+    public FileStatus getFileStatus() {
+        return this.fileStatus;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/enums/FileStatus.java b/src/main/java/de/thedevstack/conversationsplus/enums/FileStatus.java
new file mode 100644
index 00000000..b6a4ef9a
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/enums/FileStatus.java
@@ -0,0 +1,17 @@
+package de.thedevstack.conversationsplus.enums;
+
+/**
+ * Created by steckbrief on 23.08.2016.
+ */
+public enum FileStatus {
+    NOT_DOWNLOADED,
+    DOWNLOADED,
+    DOWNLOAD_FAILED,
+    DELETED,
+    DELETE_FAILED,
+    UPLOADED,
+    NEEDS_UPLOAD,
+    UNDEFINED,
+    NEEDS_DOWNLOAD,
+    DELETING;
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/http/HttpClient.java b/src/main/java/de/thedevstack/conversationsplus/http/HttpClient.java
new file mode 100644
index 00000000..e1a38067
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/http/HttpClient.java
@@ -0,0 +1,82 @@
+package de.thedevstack.conversationsplus.http;
+
+import org.apache.http.conn.ssl.StrictHostnameVerifier;
+
+import java.security.KeyManagementException;
+import java.security.NoSuchAlgorithmException;
+
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.X509TrustManager;
+
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+
+import eu.siacs.conversations.utils.CryptoHelper;
+import eu.siacs.conversations.utils.SSLSocketHelper;
+
+import okhttp3.OkHttpClient;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public final class HttpClient {
+    private static HttpClient INSTANCE;
+    private boolean interactive = false;
+    private OkHttpClient client;
+
+    public static void init() {
+        INSTANCE = new HttpClient();
+    }
+
+    public static synchronized OkHttpClient getClient(boolean interactive) {
+        if (INSTANCE.interactive != interactive) {
+            INSTANCE.interactive = interactive;
+            INSTANCE.buildClient();
+        }
+        return INSTANCE.client;
+    }
+
+    private HttpClient() {
+        this.buildClient();
+    }
+
+    private void buildClient() {
+        OkHttpClient.Builder builder = new OkHttpClient.Builder();
+        this.initTrustManager(builder);
+        this.client = builder.build();
+    }
+
+    public void initTrustManager(final OkHttpClient.Builder builder) {
+        final X509TrustManager trustManager;
+        final HostnameVerifier hostnameVerifier;
+        if (interactive) {
+            trustManager = ConversationsPlusApplication.getMemorizingTrustManager();
+            hostnameVerifier = ConversationsPlusApplication.getMemorizingTrustManager().wrapHostnameVerifier(
+                    new StrictHostnameVerifier());
+        } else {
+            trustManager = ConversationsPlusApplication.getMemorizingTrustManager()
+                    .getNonInteractive();
+            hostnameVerifier = ConversationsPlusApplication.getMemorizingTrustManager()
+                    .wrapHostnameVerifierNonInteractive(
+                            new StrictHostnameVerifier());
+        }
+        try {
+            final SSLContext sc = SSLSocketHelper.getSSLContext();
+            sc.init(null, new X509TrustManager[]{trustManager},
+                    ConversationsPlusApplication.getSecureRandom());
+
+            final SSLSocketFactory sf = sc.getSocketFactory();
+            final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
+                    sf.getSupportedCipherSuites());
+            if (cipherSuites.length > 0) {
+                sc.getDefaultSSLParameters().setCipherSuites(cipherSuites);
+
+            }
+
+            builder.sslSocketFactory(sf, trustManager);
+            builder.hostnameVerifier(hostnameVerifier);
+        } catch (final KeyManagementException | NoSuchAlgorithmException ignored) {
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/persistance/MessageDatabaseAccess.java b/src/main/java/de/thedevstack/conversationsplus/persistance/MessageDatabaseAccess.java
deleted file mode 100644
index ba5f4a2c..00000000
--- a/src/main/java/de/thedevstack/conversationsplus/persistance/MessageDatabaseAccess.java
+++ /dev/null
@@ -1,60 +0,0 @@
-package de.thedevstack.conversationsplus.persistance;
-
-import android.content.ContentValues;
-import android.database.Cursor;
-import android.database.sqlite.SQLiteDatabase;
-
-import de.thedevstack.android.logcat.Logging;
-
-import eu.siacs.conversations.entities.Message;
-import eu.siacs.conversations.xmpp.jid.InvalidJidException;
-import eu.siacs.conversations.xmpp.jid.Jid;
-
-/**
- * Created by steckbrief on 15.04.2016.
- */
-public class MessageDatabaseAccess {
-    public static final String TABLE_NAME_ADDITIONAL_PARAMETERS = "message_parameters";
-    public static final String COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD = "httpupload";
-    public static final String COLUMN_NAME_MSG_PARAMS_MSGUUID = "message_uuid";
-    public static final String COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION = "treatasdownloadable_decision";
-
-    public static final String TABLE_ADDITIONAL_PARAMETERS_CREATE_V0 = "CREATE TABLE " + MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS + " ("
-            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + " TEXT, "
-            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD + " INTEGER DEFAULT 0, "
-            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION + " TEXT DEFAULT 'NOT_DECIDED', "
-            + "FOREIGN KEY(" + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + ") REFERENCES " + Message.TABLENAME + "(" + Message.UUID + ") ON DELETE CASCADE)";
-
-    public static ContentValues getAdditionalParametersContentValues(Message message) {
-        ContentValues additionalParameters = new ContentValues();
-        additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID, message.getUuid());
-        additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD, message.isHttpUploaded() ? 1 : 0);
-        additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION, message.treatAsDownloadable().name());
-
-        return additionalParameters;
-    }
-
-    public static void populateMessageParametersFromCursor(Cursor cursor, Message message) {
-        boolean isHttpUploaded = CursorHelper.getInt(cursor, COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD) == 1;
-        message.setHttpUploaded(isHttpUploaded);
-        String downloadable = CursorHelper.getString(cursor, COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION);
-        Message.Decision treatAsDownloadable = Message.Decision.NOT_DECIDED;
-        try {
-            treatAsDownloadable = Message.Decision.valueOf(downloadable);
-        } catch (IllegalArgumentException e) {
-            // Should only happen if the database is corrupted, but to be on the save side catch it here
-            Logging.e("db.msg", "Unknown Decision for treatAsDownloadable found: '" + downloadable + "'");
-        }
-        message.setTreatAsDownloadable(treatAsDownloadable);
-    }
-
-    public static void populateMessageParameters(SQLiteDatabase db, Message message) {
-        Cursor paramsCursor = db.query(MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS,
-                null, MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + "=?",
-                new String[] {message.getUuid()},
-                null, null, null, null);
-        paramsCursor.moveToNext();
-        MessageDatabaseAccess.populateMessageParametersFromCursor(paramsCursor, message);
-        paramsCursor.close();
-    }
-}
diff --git a/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/AbstractDatabaseAccess.java b/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/AbstractDatabaseAccess.java
new file mode 100644
index 00000000..407859c7
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/AbstractDatabaseAccess.java
@@ -0,0 +1,21 @@
+package de.thedevstack.conversationsplus.persistance.db.access;
+
+import android.database.sqlite.SQLiteDatabase;
+
+/**
+ * Created by steckbrief on 24.08.2016.
+ */
+public abstract class AbstractDatabaseAccess {
+    static void executeAlterStatements(SQLiteDatabase db, String... alterStatements) {
+        for (String alterStatement : alterStatements) {
+            db.execSQL(alterStatement);
+        }
+    }
+
+    static void addNewColumns(SQLiteDatabase db, String tableName, String... columnDefinitions) {
+        for (String columnDefinition : columnDefinitions) {
+            String alterStatement = "ALTER TABLE " + tableName + " ADD COLUMN " + columnDefinition;
+            db.execSQL(alterStatement);
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/persistance/CursorHelper.java b/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/CursorHelper.java
index 7e3fdab0..122e5160 100644
--- a/src/main/java/de/thedevstack/conversationsplus/persistance/CursorHelper.java
+++ b/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/CursorHelper.java
@@ -1,4 +1,4 @@
-package de.thedevstack.conversationsplus.persistance;
+package de.thedevstack.conversationsplus.persistance.db.access;
 
 import android.database.Cursor;
 
@@ -7,7 +7,7 @@ import android.database.Cursor;
  */
 public abstract class CursorHelper {
 
-    static double getDouble(Cursor cursor, String columnName) {
+    public static double getDouble(Cursor cursor, String columnName) {
         if (null == cursor) {
             return Double.MIN_VALUE;
         }
@@ -18,7 +18,7 @@ public abstract class CursorHelper {
         return getDouble(cursor, columnIndex);
     }
 
-    static String getString(Cursor cursor, String columnName) {
+    public static String getString(Cursor cursor, String columnName) {
         if (null == cursor) {
             return null;
         }
@@ -29,7 +29,7 @@ public abstract class CursorHelper {
         return getString(cursor, columnIndex);
     }
 
-    static float getFloat(Cursor cursor, String columnName) {
+    public static float getFloat(Cursor cursor, String columnName) {
         if (null == cursor) {
             return Float.MIN_VALUE;
         }
@@ -40,7 +40,7 @@ public abstract class CursorHelper {
         return getFloat(cursor, columnIndex);
     }
 
-    static int getInt(Cursor cursor, String columnName) {
+    public static int getInt(Cursor cursor, String columnName) {
         if (null == cursor) {
             return Integer.MIN_VALUE;
         }
@@ -51,7 +51,7 @@ public abstract class CursorHelper {
         return getInt(cursor, columnIndex);
     }
 
-    static long getLong(Cursor cursor, String columnName) {
+    public static long getLong(Cursor cursor, String columnName) {
         if (null == cursor) {
             return Long.MIN_VALUE;
         }
@@ -62,7 +62,7 @@ public abstract class CursorHelper {
         return getLong(cursor, columnIndex);
     }
 
-    static int getShort(Cursor cursor, String columnName) {
+    public static int getShort(Cursor cursor, String columnName) {
         if (null == cursor) {
             return Short.MIN_VALUE;
         }
@@ -73,7 +73,7 @@ public abstract class CursorHelper {
         return getShort(cursor, columnIndex);
     }
 
-    static byte[] getBlob(Cursor cursor, String columnName) {
+    public static byte[] getBlob(Cursor cursor, String columnName) {
         if (null == cursor) {
             return null;
         }
@@ -94,7 +94,7 @@ public abstract class CursorHelper {
      * the column name does not exist.
      * @see Cursor#getColumnIndexOrThrow(String)
      */
-    static  int getColumnIndex(Cursor cursor, String columnName) {
+    public static int getColumnIndex(Cursor cursor, String columnName) {
         return cursor.getColumnIndex(columnName);
     }
 
@@ -108,7 +108,7 @@ public abstract class CursorHelper {
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a byte array.
      */
-    static  byte[] getBlob(Cursor cursor, int columnIndex) {
+    public static byte[] getBlob(Cursor cursor, int columnIndex) {
         return cursor.getBlob(columnIndex);
     }
 
@@ -122,7 +122,7 @@ public abstract class CursorHelper {
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a String.
      */
-    static  String getString(Cursor cursor, int columnIndex) {
+    public static String getString(Cursor cursor, int columnIndex) {
         return cursor.getString(columnIndex);
     }
 
@@ -137,7 +137,7 @@ public abstract class CursorHelper {
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a short.
      */
-    static  short getShort(Cursor cursor, int columnIndex) {
+    public static short getShort(Cursor cursor, int columnIndex) {
         return cursor.getShort(columnIndex);
     }
 
@@ -152,7 +152,7 @@ public abstract class CursorHelper {
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as an int.
      */
-    static  int getInt(Cursor cursor, int columnIndex) {
+    public static int getInt(Cursor cursor, int columnIndex) {
         return cursor.getInt(columnIndex);
     }
 
@@ -167,7 +167,7 @@ public abstract class CursorHelper {
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a long.
      */
-    static  long getLong(Cursor cursor, int columnIndex) {
+    public static long getLong(Cursor cursor, int columnIndex) {
         return cursor.getLong(columnIndex);
     }
 
@@ -182,7 +182,7 @@ public abstract class CursorHelper {
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a float.
      */
-    static  float getFloat(Cursor cursor, int columnIndex) {
+    public static float getFloat(Cursor cursor, int columnIndex) {
         return cursor.getFloat(columnIndex);
     }
 
@@ -197,7 +197,7 @@ public abstract class CursorHelper {
      * @param columnIndex the zero-based index of the target column.
      * @return the value of that column as a double.
      */
-    static  double getDouble(Cursor cursor, int columnIndex) {
+    public static double getDouble(Cursor cursor, int columnIndex) {
         return cursor.getDouble(columnIndex);
     }
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/MessageDatabaseAccess.java b/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/MessageDatabaseAccess.java
new file mode 100644
index 00000000..139dc419
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/persistance/db/access/MessageDatabaseAccess.java
@@ -0,0 +1,181 @@
+package de.thedevstack.conversationsplus.persistance.db.access;
+
+import android.content.ContentValues;
+import android.database.Cursor;
+import android.database.sqlite.SQLiteDatabase;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.entities.FileParams;
+import de.thedevstack.conversationsplus.enums.FileStatus;
+import de.thedevstack.conversationsplus.persistance.db.migrations.FileParamsBodyToDatabaseFieldsMigration;
+
+import eu.siacs.conversations.entities.Message;
+
+/**
+ *
+ */
+public class MessageDatabaseAccess extends AbstractDatabaseAccess {
+    // since cplus db version 1
+    public static final String TABLE_NAME_ADDITIONAL_PARAMETERS = "message_parameters";
+    private static final String COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD = "httpupload";
+    private static final String COLUMN_NAME_MSG_PARAMS_MSGUUID = "message_uuid";
+    private static final String COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION = "treatasdownloadable_decision";
+    // since cplus db version 3
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_SIZE = "file_size";
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_TYPE = "file_type";
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_WIDTH = "file_width";
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_HEIGHT = "file_height";
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_STATUS = "file_status";
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_NAME = "file_name";
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_PATH = "file_path";
+    private static final String COLUMN_NAME_MSG_PARAMS_FILE_URL = "file_url";
+
+    private static final String TABLE_ADDITIONAL_PARAMETERS_CREATE_V1 = "CREATE TABLE " + MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS + " ("
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + " TEXT, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD + " INTEGER DEFAULT 0, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION + " TEXT DEFAULT 'NOT_DECIDED', "
+            + "FOREIGN KEY(" + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + ") REFERENCES " + Message.TABLENAME + "(" + Message.UUID + ") ON DELETE CASCADE)";
+
+    private static final String TABLE_ADDITIONAL_PARAMETERS_CREATE = "CREATE TABLE " + MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS + " ("
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + " TEXT, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD + " INTEGER DEFAULT 0, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION + " TEXT DEFAULT 'NOT_DECIDED', "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_TYPE + " TEXT DEFAULT NULL, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_SIZE + " INTEGER DEFAULT 0, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_HEIGHT + " INTEGER DEFAULT 0, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_WIDTH + " INTEGER DEFAULT 0, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_STATUS + " TEXT DEFAULT 'UNDEFINED', "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_NAME + " TEXT DEFAULT NULL, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_PATH + " TEXT DEFAULT NULL, "
+            + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_URL + " TEXT DEFAULT NULL, "
+            + "FOREIGN KEY(" + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + ") REFERENCES " + Message.TABLENAME + "(" + Message.UUID + ") ON DELETE CASCADE)";
+
+    public static void updateMessageParameters(SQLiteDatabase db, Message message, String uuid) {
+        String[] args = {uuid};
+        db.update(MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS, MessageDatabaseAccess.getAdditionalParametersContentValues(message), MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + "=?", args);
+    }
+
+    public static ContentValues getAdditionalParametersContentValues(Message message) {
+        ContentValues additionalParameters = new ContentValues();
+        additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID, message.getUuid());
+        additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD, message.isHttpUploaded() ? 1 : 0);
+        additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION, message.treatAsDownloadable().name());
+        if (null != message.getFileParams()) {
+            FileParams fileParams = message.getFileParams();
+            additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_TYPE, fileParams.getMimeType());
+            additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_SIZE, fileParams.getSize());
+            additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_HEIGHT, fileParams.getHeight());
+            additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_WIDTH, fileParams.getWidth());
+            additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_PATH, fileParams.getPath());
+            additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_URL, fileParams.getUrl());
+            if (null != fileParams.getFileStatus()) {
+                additionalParameters.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_STATUS, fileParams.getFileStatus().name());
+            }
+        }
+
+        return additionalParameters;
+    }
+
+    private static void populateMessageParametersFromCursor(Cursor cursor, Message message) {
+        boolean isHttpUploaded = CursorHelper.getInt(cursor, COLUMN_NAME_MSG_PARAMS_HTTPUPLOAD) == 1;
+        message.setHttpUploaded(isHttpUploaded);
+        String downloadable = CursorHelper.getString(cursor, COLUMN_NAME_MSG_PARAMS_TREATASDOWNLOADABLE_DECISION);
+        Message.Decision treatAsDownloadable = Message.Decision.NOT_DECIDED;
+        try {
+            treatAsDownloadable = Message.Decision.valueOf(downloadable);
+        } catch (IllegalArgumentException e) {
+            // Should only happen if the database is corrupted, but to be on the save side catch it here
+            Logging.e("db.msg", "Unknown Decision for treatAsDownloadable found: '" + downloadable + "'");
+        }
+
+        message.setTreatAsDownloadable(treatAsDownloadable);
+
+        if (message.hasFileAttached()) {
+            FileParams fileParams = new FileParams(message.getBody());
+            String fileType = CursorHelper.getString(cursor, COLUMN_NAME_MSG_PARAMS_FILE_TYPE);
+            fileParams.setMimeType(fileType);
+            String name = CursorHelper.getString(cursor, COLUMN_NAME_MSG_PARAMS_FILE_NAME);
+            fileParams.setName(name);
+            String path = CursorHelper.getString(cursor, COLUMN_NAME_MSG_PARAMS_FILE_PATH);
+            fileParams.setPath(path);
+            String url = CursorHelper.getString(cursor, COLUMN_NAME_MSG_PARAMS_FILE_URL);
+            fileParams.setUrl(url);
+            long fileSize = CursorHelper.getLong(cursor, COLUMN_NAME_MSG_PARAMS_FILE_SIZE);
+            fileParams.setSize(fileSize);
+            int imageHeight = CursorHelper.getInt(cursor, COLUMN_NAME_MSG_PARAMS_FILE_HEIGHT);
+            fileParams.setHeight(imageHeight);
+            int imageWidth = CursorHelper.getInt(cursor, COLUMN_NAME_MSG_PARAMS_FILE_WIDTH);
+            fileParams.setWidth(imageWidth);
+            String status = CursorHelper.getString(cursor, COLUMN_NAME_MSG_PARAMS_FILE_STATUS);
+            if (null != status && !status.isEmpty()) {
+                FileStatus fileStatus = FileStatus.UNDEFINED;
+                try {
+                    fileStatus = FileStatus.valueOf(status);
+                } catch (IllegalArgumentException e) {
+                    // Should only happen if the database is corrupted, but to be on the save side catch it here
+                    Logging.e("db.msg", "Unknown FileStatus for fileParams.fileStatus found: '" + status + "'");
+                }
+                fileParams.setFileStatus(fileStatus);
+            }
+            message.setFileParams(fileParams);
+        }
+    }
+
+    public static void populateMessageParameters(SQLiteDatabase db, Message message) {
+        Cursor paramsCursor = db.query(MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS,
+                null, MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + "=?",
+                new String[] {message.getUuid()},
+                null, null, null, null);
+        paramsCursor.moveToNext();
+        MessageDatabaseAccess.populateMessageParametersFromCursor(paramsCursor, message);
+        paramsCursor.close();
+    }
+
+    public static void upgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
+        if (oldVersion < 1 && newVersion >= 1) {
+            Logging.d("db.upgrade.cplus", "Creating additional parameters table for messages.");
+            db.execSQL(MessageDatabaseAccess.TABLE_ADDITIONAL_PARAMETERS_CREATE_V1);
+            db.execSQL("INSERT INTO " + MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS + "(" + MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + ") "
+                    + " SELECT " + Message.UUID + " FROM " + Message.TABLENAME);
+        }
+        if (oldVersion < 3 && newVersion >= 3) {
+            Logging.d("db.upgrade.cplus", "Upgrade " + MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS);
+            String[] columnDefinitions = {
+                    MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_TYPE + " TEXT DEFAULT NULL",
+                    MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_SIZE + " INTEGER DEFAULT 0",
+                    MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_HEIGHT + " INTEGER DEFAULT 0",
+                    MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_WIDTH + " INTEGER DEFAULT 0",
+                    MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_STATUS + " TEXT DEFAULT 'UNDEFINED'",
+                    MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_NAME + " TEXT DEFAULT NULL",
+                    MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_PATH + " TEXT DEFAULT NULL",
+            };
+
+            addNewColumns(db, MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS, columnDefinitions);
+
+            Logging.d("db.upgrade.cplus", "Migrate file params from message body to database fields");
+            Cursor cursor = db.rawQuery("SELECT " + Message.UUID + ", " + Message.BODY + " FROM " + Message.TABLENAME + " WHERE " + Message.TYPE + "=? OR " + Message.TYPE + "=?", new String[] {String.valueOf(Message.TYPE_FILE), String.valueOf(Message.TYPE_IMAGE)});
+            while (cursor.moveToNext()) {
+                String uuid = CursorHelper.getString(cursor, Message.UUID);
+                String body = CursorHelper.getString(cursor, Message.BODY);
+                FileParams fileParams = FileParamsBodyToDatabaseFieldsMigration.getFileParams(body);
+                String newBody = fileParams.getUrl();
+                ContentValues values = new ContentValues();
+                values.put(Message.BODY, newBody);
+                db.update(Message.TABLENAME, values, Message.UUID + "=?", new String[] {uuid});
+
+                ContentValues parameterValues = new ContentValues();
+                parameterValues.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_SIZE, fileParams.getSize());
+                parameterValues.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_HEIGHT, fileParams.getHeight());
+                parameterValues.put(MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_FILE_WIDTH, fileParams.getWidth());
+
+                db.update(MessageDatabaseAccess.TABLE_NAME_ADDITIONAL_PARAMETERS, parameterValues, MessageDatabaseAccess.COLUMN_NAME_MSG_PARAMS_MSGUUID + "=?", new String[] {uuid});
+            }
+            cursor.close();
+        }
+    }
+
+    public static void create(SQLiteDatabase db) {
+        // Create Conversations+ related tables
+        db.execSQL(MessageDatabaseAccess.TABLE_ADDITIONAL_PARAMETERS_CREATE);
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/persistance/db/migrations/FileParamsBodyToDatabaseFieldsMigration.java b/src/main/java/de/thedevstack/conversationsplus/persistance/db/migrations/FileParamsBodyToDatabaseFieldsMigration.java
new file mode 100644
index 00000000..c0aa63c0
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/persistance/db/migrations/FileParamsBodyToDatabaseFieldsMigration.java
@@ -0,0 +1,101 @@
+package de.thedevstack.conversationsplus.persistance.db.migrations;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import de.thedevstack.conversationsplus.entities.FileParams;
+
+/**
+ * Created by steckbrief on 24.08.2016.
+ */
+public class FileParamsBodyToDatabaseFieldsMigration {
+
+    public static FileParams getFileParams(String body) {
+        FileParams params = getLegacyFileParams(body);
+        if (params != null) {
+            return params;
+        }
+        params = new FileParams();
+        if (body == null) {
+            return params;
+        }
+        String parts[] = body.split("\\|");
+        switch (parts.length) {
+            case 1:
+                try {
+                    params.setSize(Long.parseLong(parts[0]));
+                } catch (NumberFormatException e) {
+                    try {
+                        URL url = new URL(parts[0]);
+                        params.setUrl(url.toString());
+                    } catch (MalformedURLException e1) {
+                    }
+                }
+                break;
+            case 2:
+            case 4:
+                try {
+                    URL url = new URL(parts[0]);
+                    params.setUrl(url.toString());
+                } catch (MalformedURLException e1) {
+                }
+                try {
+                    params.setSize(Long.parseLong(parts[1]));
+                } catch (NumberFormatException e) {
+                }
+                try {
+                    params.setWidth(Integer.parseInt(parts[2]));
+                } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
+                }
+                try {
+                    params.setHeight(Integer.parseInt(parts[3]));
+                } catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
+                }
+                break;
+            case 3:
+                try {
+                    params.setSize(Long.parseLong(parts[0]));
+                } catch (NumberFormatException e) {
+                }
+                try {
+                    params.setWidth(Integer.parseInt(parts[1]));
+                } catch (NumberFormatException e) {
+                }
+                try {
+                    params.setHeight(Integer.parseInt(parts[2]));
+                } catch (NumberFormatException e) {
+                }
+                break;
+        }
+        return params;
+    }
+
+    private static FileParams getLegacyFileParams(String body) {
+        FileParams params = new FileParams();
+        if (body == null) {
+            return params;
+        }
+        String parts[] = body.split(",");
+        if (parts.length == 3) {
+            try {
+                params.setSize(Long.parseLong(parts[0]));
+            } catch (NumberFormatException e) {
+                return null;
+            }
+            try {
+                params.setWidth(Integer.parseInt(parts[1]));
+            } catch (NumberFormatException e) {
+                return null;
+            }
+            try {
+                params.setHeight(Integer.parseInt(parts[2]));
+            } catch (NumberFormatException e) {
+                return null;
+            }
+            return params;
+        } else {
+            return null;
+        }
+    }
+
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/FileTransferService.java b/src/main/java/de/thedevstack/conversationsplus/services/FileTransferService.java
new file mode 100644
index 00000000..300d25e9
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/FileTransferService.java
@@ -0,0 +1,36 @@
+package de.thedevstack.conversationsplus.services;
+
+import eu.siacs.conversations.entities.Message;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferStatusListener;
+
+/**
+ * An implementation of this class transfers a file to another entity or server.
+ */
+public interface FileTransferService {
+    /**
+     * Transfers a file for the corresponding message.
+     * @param message the message containing the file to transfer
+     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
+     */
+    boolean transferFile(Message message);
+    /**
+     * Transfers a file for the corresponding message.
+     * @param message the message containing the file to transfer
+     * @param delay whether the message is delayed or not
+     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
+     */
+    boolean transferFile(Message message, boolean delay);
+
+    /**
+     * Checks whether a message can be sent using this service or not.
+     * @param message the message to be checked
+     * @return <code>true</code> if the message can be processed, <code>false</code> otherwise
+     */
+    boolean accept(Message message);
+
+    /**
+     * Adds one or more file transfer status listeners.
+     * @param listeners the listeners to add
+     */
+    void addFileTransferStatusListener(FileTransferStatusListener... listeners);
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/AbstractFileTransferService.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/AbstractFileTransferService.java
new file mode 100644
index 00000000..c24603b7
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/AbstractFileTransferService.java
@@ -0,0 +1,23 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import de.thedevstack.conversationsplus.services.FileTransferService;
+
+/**
+ *
+ */
+public abstract class AbstractFileTransferService implements FileTransferService {
+    private List<FileTransferStatusListener> statusListeners = new ArrayList<>();
+
+    @Override
+    public void addFileTransferStatusListener(FileTransferStatusListener... listeners) {
+        this.statusListeners.addAll(Arrays.asList(listeners));
+    }
+
+    protected void addStatusListenerToEntity(FileTransferEntity entity) {
+        entity.addFileTransferStatusListener(this.statusListeners.toArray(new FileTransferStatusListener[0]));
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferEntity.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferEntity.java
new file mode 100644
index 00000000..7799fe8f
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferEntity.java
@@ -0,0 +1,235 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+import java.io.InputStream;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import de.thedevstack.conversationsplus.utils.StreamUtil;
+
+import eu.siacs.conversations.entities.DownloadableFile;
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.entities.Transferable;
+import eu.siacs.conversations.persistance.FileBackend;
+
+/**
+ *
+ */
+public class FileTransferEntity implements Transferable {
+    /**
+     * Listeners to inform about a status change.
+     */
+    private final List<FileTransferStatusListener> statusListeners = new ArrayList<>();
+    /**
+     * The associated message.
+     */
+    private final Message message;
+    /**
+     * Number of attempts.
+     */
+    private int attempts = 0;
+    /**
+     * The status of the file transfer.
+     */
+    private FileTransferStatusEnum transferStatus;
+    /**
+     * Number of bytes transmitted.
+     */
+    private long transmitted = 0;
+    /**
+     * The associated file.
+     */
+    private DownloadableFile file;
+    /**
+     * The associated file as stream.
+     */
+    private InputStream fileInputStream;
+
+    /**
+     * Initializes the FileTransferEntity based on the associated message.
+     * This initialization includes loading the file and associating this transferable to the message.
+     * @param message the message in which the file to transfer is contained.
+     */
+    public FileTransferEntity(Message message) {
+        this.message = message;
+        this.message.setTransferable(this);
+        this.file = FileBackend.getFile(message, false);
+    }
+
+    /**
+     * Start something.
+     * Empty implementation since documentation in interface is missing.
+     * @return <code>false</code>
+     */
+    @Override
+    public boolean start() {
+        return false;
+    }
+
+    /**
+     * Returns the global transferable status.
+     *
+     * @return {@value STATUS_FAILED} if #isFailed returns <code>true</code>, {@value STATUS_UPLOADING} otherwise
+     */
+    @Override
+    public int getStatus() {
+        int status = (isFailed()) ? STATUS_FAILED : STATUS_UPLOADING;
+        return status;
+    }
+
+    /**
+     * Returns the expected file size of the underlying file.
+     * @return the expected file size or 0 if no file is associated.
+     */
+    @Override
+    public long getFileSize() {
+        return file == null ? 0 : file.getExpectedSize();
+    }
+
+    /**
+     * Calculates the current progress in percent.
+     *
+     * @return the current progress in percent
+     */
+    @Override
+    public int getProgress() {
+        if (file == null) {
+            return 0;
+        }
+        return (int) ((((double) transmitted) / file.getExpectedSize()) * 100);
+    }
+
+    /**
+     * Cancels the file transfer and informs the listeners about cancellation.
+     */
+    @Override
+    public void cancel() {
+        this.transferStatus = FileTransferStatusEnum.CANCELED;
+
+        this.close();
+
+        for (FileTransferStatusListener listener : this.statusListeners) {
+            listener.onCancel(this);
+        }
+    }
+
+    /**
+     * Starts an transfer attempt.
+     */
+    public void startAttempt() {
+        this.attempts++;
+        this.transferStatus = FileTransferStatusEnum.TRANSFERRING;
+    }
+
+    /**
+     * Fails an file transfer and informs the listeners about failure.
+     *
+     * @param failureReason the reason of failure.
+     */
+    public void fail(FileTransferFailureReason failureReason) {
+        this.transferStatus = FileTransferStatusEnum.FAILED;
+
+        this.close();
+
+        failureReason.setAttempt(this.attempts);
+        for (FileTransferStatusListener listener : this.statusListeners) {
+            listener.onFailure(this, failureReason);
+        }
+    }
+
+    /**
+     * Updates the progress by adding parameter value to current progress value.
+     *
+     * @param progress the number of newly transferred bytes
+     */
+    public void updateProgress(long progress) {
+        if (0 == this.attempts) {
+            this.startAttempt();
+        }
+        this.transmitted += progress;
+    }
+
+    /**
+     * Set the status of the file transfer to FileTransferStatusEnum#TRANSFERRED and informs the listeners about success.
+     */
+    public void transferred() {
+        this.transferStatus = FileTransferStatusEnum.TRANSFERRED;
+
+        this.close();
+
+        for (FileTransferStatusListener listener : this.statusListeners) {
+            listener.onSuccess(this);
+        }
+    }
+
+    /**
+     * Closes the file input stream (if it is not yet closed) and removes association with message.
+     */
+    private void close() {
+        StreamUtil.close(this.fileInputStream);
+        this.getMessage().setTransferable(null);
+    }
+
+    /**
+     * Whether the file is transferred or not.
+     * @return <code>true</code> if the file is successfully transferred, <code>false</code> otherwise
+     */
+    public boolean isTransferred() {
+        return FileTransferStatusEnum.TRANSFERRED == this.transferStatus;
+    }
+
+    /**
+     * Whether the file transfer is canceled or not.
+     * @return <code>true</code> if the file transfer was canceled, <code>false</code> otherwise
+     */
+    public boolean isCanceled() {
+        return FileTransferStatusEnum.CANCELED == this.transferStatus;
+    }
+
+    /**
+     * Whether the file transfer failed or not.
+     * @return <code>true</code> if the file transfer failed, <code>false</code> otherwise
+     */
+    public boolean isFailed() {
+        return FileTransferStatusEnum.FAILED == this.transferStatus;
+    }
+
+    public void setFileInputStream(InputStream fileInputStream) {
+        this.fileInputStream = fileInputStream;
+    }
+
+    public InputStream getFileInputStream() {
+        return fileInputStream;
+    }
+
+    public Message getMessage() {
+        return message;
+    }
+
+    public DownloadableFile getFile() {
+        return file;
+    }
+
+    public void addFileTransferStatusListener(FileTransferStatusListener... listeners) {
+        this.statusListeners.addAll(Arrays.asList(listeners));
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+
+        FileTransferEntity that = (FileTransferEntity) o;
+
+        String uuid = message != null ? message.getUuid() : null;
+        String thatUuid = that.message != null ? that.message.getUuid() : null;
+
+        return uuid != null ? uuid.equals(thatUuid) : thatUuid == null;
+
+    }
+
+    @Override
+    public int hashCode() {
+        return message != null && message.getUuid() != null ? message.getUuid().hashCode() : 0;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferFailureReason.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferFailureReason.java
new file mode 100644
index 00000000..353c34d8
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferFailureReason.java
@@ -0,0 +1,91 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+/**
+ *
+ */
+public final class FileTransferFailureReason {
+    private final FileTransferFailureType type;
+    private int attempt;
+    private Exception causedByException;
+    private String failureMessage;
+
+    public static FileTransferFailureReason createRecoverableFailureReason(Exception e) {
+        return createFailureReason(FileTransferFailureType.RECOVERABLE, e.getMessage(), e);
+    }
+
+    public static FileTransferFailureReason createRecoverableFailureReason(String reason) {
+        return createFailureReason(FileTransferFailureType.RECOVERABLE, reason, null);
+    }
+
+    public static FileTransferFailureReason createRecoverableFailureReason(Exception e, String failureMessage) {
+        return createFailureReason(FileTransferFailureType.RECOVERABLE, failureMessage, e);
+    }
+
+    public static FileTransferFailureReason createLimitedRecoverableFailureReason(Exception e) {
+        return createFailureReason(FileTransferFailureType.LIMITEDRECOVERABLE, e.getMessage(), e);
+    }
+
+    public static FileTransferFailureReason createLimitedRecoverableFailureReason(String reason) {
+        return createFailureReason(FileTransferFailureType.LIMITEDRECOVERABLE, reason, null);
+    }
+
+    public static FileTransferFailureReason createLimitedRecoverableFailureReason(Exception e, String failureMessage) {
+        return createFailureReason(FileTransferFailureType.LIMITEDRECOVERABLE, failureMessage, e);
+    }
+
+    public static FileTransferFailureReason createNonRecoverableFailureReason(Exception e) {
+        return createFailureReason(FileTransferFailureType.NONRECOVERABLE, e.getMessage(), e);
+    }
+
+    public static FileTransferFailureReason createNonRecoverableFailureReason(String reason) {
+        return createFailureReason(FileTransferFailureType.NONRECOVERABLE, reason, null);
+    }
+
+    public static FileTransferFailureReason createNonRecoverableFailureReason(Exception e, String failureMessage) {
+        return createFailureReason(FileTransferFailureType.NONRECOVERABLE, failureMessage, e);
+    }
+
+    private static FileTransferFailureReason createFailureReason(FileTransferFailureType type, String message, Exception e) {
+        FileTransferFailureReason ftfr = new FileTransferFailureReason(type);
+        ftfr.setCausedByException(e);
+        if (null != e && (null == message || message.isEmpty())) {
+            message = e.getMessage();
+        }
+        ftfr.setFailureMessage(message);
+
+        return ftfr;
+
+    }
+
+    private FileTransferFailureReason(FileTransferFailureType type) {
+        this.type = type;
+    }
+
+    public void setFailureMessage(String failureMessage) {
+        this.failureMessage = failureMessage;
+    }
+
+    public String getFailureMessage() {
+        return failureMessage;
+    }
+
+    public FileTransferFailureType getType() {
+        return type;
+    }
+
+    public void setCausedByException(Exception causedByException) {
+        this.causedByException = causedByException;
+    }
+
+    public Exception getCausedByException() {
+        return causedByException;
+    }
+
+    public void setAttempt(int attempt) {
+        this.attempt = attempt;
+    }
+
+    public boolean isRecoverable() {
+        return this.type.isRetryPossible(this.attempt);
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferFailureType.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferFailureType.java
new file mode 100644
index 00000000..3daca38e
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferFailureType.java
@@ -0,0 +1,24 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+/**
+ *
+ */
+public enum FileTransferFailureType {
+    RECOVERABLE(Integer.MAX_VALUE),
+    LIMITEDRECOVERABLE(5),
+    NONRECOVERABLE(1);
+
+    int maxAttempts;
+
+    FileTransferFailureType(int maxAttempts) {
+        this.maxAttempts = maxAttempts;
+    }
+
+    public boolean isRetryPossible(int attempt) {
+        return attempt < this.maxAttempts;
+    }
+
+    public int getMaxAttempts() {
+        return this.maxAttempts;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferManager.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferManager.java
new file mode 100644
index 00000000..112aafd1
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferManager.java
@@ -0,0 +1,178 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.services.FileTransferService;
+import de.thedevstack.conversationsplus.services.filetransfer.http.upload.HttpFileTransferEntity;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
+
+import eu.siacs.conversations.Config;
+import eu.siacs.conversations.entities.Message;
+
+/**
+ *
+ */
+public class FileTransferManager implements FileTransferStatusListener {
+    private SortedSet<WeightedTransferService> transferServices;
+    private static final FileTransferManager INSTANCE = new FileTransferManager();
+    private final HashMap<String, WeightedTransferService> activeTransfers = new HashMap<>();
+
+    private FileTransferManager() {
+        this.transferServices = new TreeSet<>();
+    }
+
+    public static FileTransferManager getInstance() {
+        return INSTANCE;
+    }
+
+    public static void init(FileTransferService... fileTransferServices) {
+        if (null != fileTransferServices && fileTransferServices.length > 0) {
+            for (FileTransferService fts : fileTransferServices) {
+                addFileTransferService(fts);
+            }
+        }
+    }
+
+    public static void init(HashMap<Integer, FileTransferService> fileTransferServices) {
+        for (Map.Entry<Integer, FileTransferService> entry : fileTransferServices.entrySet()) {
+            addFileTransferService(entry.getKey(), entry.getValue());
+        }
+    }
+
+    public static void addFileTransferService(int weight, FileTransferService fts) {
+        fts.addFileTransferStatusListener(INSTANCE);
+        INSTANCE.transferServices.add(new WeightedTransferService(weight, fts));
+    }
+
+    public static void addFileTransferService(FileTransferService fts) {
+        int weight = 1;
+        if (!INSTANCE.transferServices.isEmpty()) {
+            weight = INSTANCE.transferServices.last().weight + 1;
+        }
+        addFileTransferService(weight, fts);
+    }
+
+    /**
+     * Transfers a file for the corresponding message.
+     *
+     * @param message the message containing the file to transfer
+     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
+     */
+    public boolean transferFile(Message message) {
+        return this.transferFile(message, false);
+    }
+
+    /**
+     * Transfers a file for the corresponding message.
+     *
+     * @param message the message containing the file to transfer
+     * @param delay   whether the message is delayed or not
+     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
+     */
+    public boolean transferFile(Message message, boolean delay) {
+        Logging.d(Config.LOGTAG, "send file message");
+        boolean transferSuccessfullyStarted = false;
+        for (WeightedTransferService wts : this.transferServices) {
+            try {
+                if (wts.fileTransferService.accept(message)) {
+                    transferSuccessfullyStarted = this.startFileTransfer(message, delay, wts);
+                    if (transferSuccessfullyStarted) {
+                        break;
+                    }
+                }
+            } catch (Exception e) {
+                //TODO Do real exception handling!!!!!
+            }
+        }
+        return transferSuccessfullyStarted;
+    }
+
+    /**
+     * Checks whether a message can be sent using this service or not.
+     *
+     * @param message the message to be checked
+     * @return <code>true</code> if the message can be processed, <code>false</code> otherwise
+     */
+    public boolean accept(Message message) {
+        return message.needsUploading();
+    }
+
+    @Override
+    public void onFailure(FileTransferEntity entity, FileTransferFailureReason failureReason) {
+        WeightedTransferService wts = this.activeTransfers.get(entity.getMessage().getUuid());
+        if (null == wts) {
+            return;
+        }
+        boolean delayed = (entity instanceof HttpFileTransferEntity) && ((HttpFileTransferEntity) entity).isDelayed();
+        if (failureReason.isRecoverable()) {
+            wts.fileTransferService.transferFile(entity.getMessage(), delayed);
+        } else {
+            boolean retransferStarted = false;
+            this.activeTransfers.remove(entity.getMessage().getUuid());
+            for (WeightedTransferService newWts : this.transferServices.tailSet(wts)) {
+                if (newWts == wts) { // Same Reference
+                    continue;
+                }
+                if (newWts.fileTransferService.accept(entity.getMessage())) {
+                    retransferStarted = startFileTransfer(entity.getMessage(), delayed, newWts);
+                    if (retransferStarted) {
+                        break;
+                    }
+                }
+            }
+            if (!retransferStarted) {
+                MessageUtil.markMessage(entity.getMessage(), Message.STATUS_SEND_FAILED);
+            }
+        }
+    }
+
+    @Override
+    public void onCancel(FileTransferEntity entity) {
+        this.activeTransfers.remove(entity.getMessage().getUuid());
+        MessageUtil.markMessage(entity.getMessage(), Message.STATUS_SEND_FAILED); // TODO New Status CANCELED!
+    }
+
+    @Override
+    public void onSuccess(FileTransferEntity entity) {
+        this.activeTransfers.remove(entity.getMessage().getUuid());
+    }
+
+    private boolean startFileTransfer(Message message, boolean delayed, WeightedTransferService wts) {
+        boolean transferSuccessfullyStarted = wts.fileTransferService.transferFile(message, delayed);
+        if (transferSuccessfullyStarted) {
+            this.activeTransfers.put(message.getUuid(), wts);
+        }
+        return transferSuccessfullyStarted;
+    }
+
+    static class WeightedTransferService implements Comparable<WeightedTransferService> {
+        int weight;
+        FileTransferService fileTransferService;
+
+        WeightedTransferService(int weight, FileTransferService service) {
+            this.weight = weight;
+            this.fileTransferService = service;
+        }
+
+        /**
+         * Compares this object to the specified object to determine their relative
+         * order.
+         *
+         * @param another the object to compare to this instance.
+         * @return a negative integer if this instance is less than {@code another};
+         * a positive integer if this instance is greater than
+         * {@code another}; 0 if this instance has the same order as
+         * {@code another}.
+         * @throws ClassCastException if {@code another} cannot be converted into something
+         *                            comparable to {@code this} instance.
+         */
+        @Override
+        public int compareTo(WeightedTransferService another) {
+            return this.weight - another.weight;
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusEnum.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusEnum.java
new file mode 100644
index 00000000..e55d94d8
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusEnum.java
@@ -0,0 +1,23 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+/**
+ * Status values of a file transfer.
+ */
+public enum FileTransferStatusEnum {
+    /**
+     * The file transfer is in progress.
+     */
+    TRANSFERRING,
+    /**
+     * The file transfer was finished successfully.
+     */
+    TRANSFERRED,
+    /**
+     * The file transfer failed.
+     */
+    FAILED,
+    /**
+     * The file transfer was canceled.
+     */
+    CANCELED;
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusListener.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusListener.java
new file mode 100644
index 00000000..638a20cf
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusListener.java
@@ -0,0 +1,12 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+import eu.siacs.conversations.entities.Message;
+
+/**
+ *
+ */
+public interface FileTransferStatusListener {
+    void onFailure(FileTransferEntity entity, FileTransferFailureReason failureReason);
+    void onSuccess(FileTransferEntity entity);
+    void onCancel(FileTransferEntity entity);
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteRemoteFile.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteRemoteFile.java
new file mode 100644
index 00000000..95b8450a
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteRemoteFile.java
@@ -0,0 +1,22 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.delete;
+
+import android.support.annotation.NonNull;
+
+import eu.siacs.conversations.entities.Message;
+import de.thedevstack.conversationsplus.dto.RemoteFile;
+
+/**
+ *
+ */
+public class DeleteRemoteFile extends RemoteFile {
+    private final Message message;
+
+    public DeleteRemoteFile(@NonNull String path, @NonNull Message message) {
+        super(path);
+        this.message = message;
+    }
+
+    public Message getMessage() {
+        return message;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteRemoteFileService.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteRemoteFileService.java
new file mode 100644
index 00000000..f60efb56
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteRemoteFileService.java
@@ -0,0 +1,50 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.delete;
+
+import de.thedevstack.conversationsplus.enums.FileStatus;
+import de.thedevstack.conversationsplus.ui.listeners.SimpleUserDecisionCallback;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.FileTransferHttp;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.delete.FileTransferHttpDeleteSlotRequestPacketGenerator;
+
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.xmpp.jid.Jid;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public class DeleteRemoteFileService implements SimpleUserDecisionCallback {
+    private Message message;
+
+    public DeleteRemoteFileService(Message message) {
+        this.message = message;
+    }
+
+    public void deleteRemoteFile() {
+        if (this.message.isHttpUploaded()) {
+            String path = this.message.getBody();
+            if (this.message.hasFileOnRemoteHost()) {
+                path = this.message.getFileParams().getUrl();
+            }
+
+            DeleteRemoteFile remoteFile = new DeleteRemoteFile(path, this.message);
+            Account account = this.message.getConversation().getAccount();
+            Jid host = account.getXmppConnection().findDiscoItemByFeature(FileTransferHttp.NAMESPACE);
+            IqPacket request = FileTransferHttpDeleteSlotRequestPacketGenerator.generate(host, path);
+            MessageUtil.setAndSaveFileStatus(this.message, FileStatus.DELETING);
+            XmppSendUtil.sendIqPacket(account, request, new DeleteTokenReceived(remoteFile));
+        }
+    }
+
+    @Override
+    public void onYes() {
+        this.deleteRemoteFile();
+    }
+
+    @Override
+    public void onNo() {
+        // Nothing to do
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteTokenReceived.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteTokenReceived.java
new file mode 100644
index 00000000..3151ca30
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/delete/DeleteTokenReceived.java
@@ -0,0 +1,89 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.delete;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+
+import java.io.IOException;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.enums.FileStatus;
+import de.thedevstack.conversationsplus.http.HttpClient;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
+import de.thedevstack.conversationsplus.xmpp.exceptions.XmppException;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.delete.DeleteSlotPacketParser;
+
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+import eu.siacs.conversations.xmpp.OnIqPacketReceived;
+
+import okhttp3.Call;
+import okhttp3.Callback;
+import okhttp3.OkHttpClient;
+import okhttp3.Request;
+import okhttp3.Response;
+
+/**
+ *
+ */
+public class DeleteTokenReceived implements OnIqPacketReceived {
+    private static final String HEADER_NAME_DELETE_TOKEN = "X-FILETRANSFER-HTTP-DELETE-TOKEN";
+    private final DeleteRemoteFile remoteFile;
+
+    public DeleteTokenReceived(DeleteRemoteFile remoteFile) {
+        this.remoteFile = remoteFile;
+    }
+
+    @Override
+    public void onIqPacketReceived(Account account, IqPacket packet) {
+        try {
+            String url = this.remoteFile.getPath();
+            String deleteToken = DeleteSlotPacketParser.parseDeleteToken(packet);
+            Logging.d("filetransfer.http.delete", "Got delete token '" + deleteToken + "' for remote file '" + remoteFile.getPath() + "'");
+            OkHttpClient client = HttpClient.getClient(true);
+            Request request = new Request.Builder()
+                    .url(url)
+                    .addHeader(HEADER_NAME_DELETE_TOKEN, deleteToken)
+                    .delete()
+                    .build();
+            client.newCall(request).enqueue(new Callback() {
+                @Override
+                public void onFailure(Call call, IOException e) {
+                    Logging.e("filetransfer.http.delete", "Error while connecting to '" + call.request().url() + "': " + e.getMessage());
+                    MessageUtil.setAndSaveFileStatus(remoteFile.getMessage(), FileStatus.DELETE_FAILED);
+                }
+
+                @Override
+                public void onResponse(Call call, Response response) throws IOException {
+                    if (response.isSuccessful()) {
+                        MessageUtil.setAndSaveFileStatus(remoteFile.getMessage(), FileStatus.DELETED);
+                        Logging.i("filetransfer.http.delete", "Remote file successfully deleted '" + remoteFile.getPath() + "'");
+                    } else {
+                        String detailedMessage = response.body().string();
+                        FileStatus fileStatus = FileStatus.DELETE_FAILED;
+                        switch (response.code()) {
+                            case 403:
+                            case 500:
+                                try {
+                                    JSONObject jsonObject = new JSONObject(detailedMessage);
+                                    detailedMessage = jsonObject.getString("msg");
+                                } catch (JSONException e) {
+                                    Logging.e("filetransfer.http.delete", "Failed to get error message from expected json response: " + detailedMessage);
+                                }
+                                break;
+                            case 404:
+                                fileStatus = FileStatus.DELETED;
+                                Logging.i("filetransfer.http.delete", "Failed to delete file - it was already deleted.");
+                                break;
+                        }
+                        Logging.e("filetransfer.http.delete", "Could not delete remote file '" + remoteFile.getPath() + "'. Response Code: " + response.code() + ", details: " + detailedMessage);
+                        MessageUtil.setAndSaveFileStatus(remoteFile.getMessage(), fileStatus);
+                    }
+                }
+            });
+
+        } catch (XmppException e) {
+            Logging.e("filetransfer.http.delete", "Error while trying to get the delete token: " + e.getMessage());
+            MessageUtil.setAndSaveFileStatus(remoteFile.getMessage(), FileStatus.DELETE_FAILED);
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpFileTransferEntity.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpFileTransferEntity.java
new file mode 100644
index 00000000..9ec07679
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpFileTransferEntity.java
@@ -0,0 +1,97 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.upload;
+
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.entities.FileParams;
+import de.thedevstack.conversationsplus.enums.FileStatus;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferEntity;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferFailureReason;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload.HttpUploadSlot;
+
+import eu.siacs.conversations.Config;
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.utils.CryptoHelper;
+
+/**
+ *
+ */
+public class HttpFileTransferEntity extends FileTransferEntity {
+    private HttpUploadSlot slot;
+    private final byte[] key;
+    private final boolean delayed;
+
+    public HttpFileTransferEntity(Message message, boolean delayed) {
+        super(message);
+        this.getMessage().setHttpUploaded(true);
+        this.getMessage().setNoDownloadable(); // TODO Set rmeote file status to uploaded
+        FileParams fileParams = this.getMessage().getFileParams();
+        if (null == fileParams) {
+            fileParams = new FileParams();
+        }
+        fileParams.setFileStatus(FileStatus.NEEDS_UPLOAD);
+        this.getMessage().setFileParams(fileParams);
+        if (Config.ENCRYPT_ON_HTTP_UPLOADED
+                || message.getEncryption() == Message.ENCRYPTION_AXOLOTL
+                || message.getEncryption() == Message.ENCRYPTION_OTR) {
+            this.key = new byte[48];
+            ConversationsPlusApplication.getSecureRandom().nextBytes(this.key);
+            this.getFile().setKeyAndIv(this.key);
+        } else {
+            this.key = null;
+        }
+        this.delayed = delayed;
+    }
+
+    public void setSlot(HttpUploadSlot slot) {
+        this.slot = slot;
+    }
+
+    public String getGetUrl() {
+        return this.slot.getGetUrl();
+    }
+
+    public String getPutUrl() {
+        return this.slot.getPutUrl();
+    }
+
+    public byte[] getKey() {
+        return key;
+    }
+
+    public boolean isDelayed() {
+        return this.delayed;
+    }
+
+    @Override
+    public void fail(FileTransferFailureReason failureReason) {
+        this.getMessage().setHttpUploaded(false);
+        super.fail(failureReason);
+    }
+
+    @Override
+    public void cancel() {
+        this.getMessage().setHttpUploaded(false);
+        super.cancel();
+    }
+
+    @Override
+    public void transferred() {
+        try {
+            URL getUrl = new URL(this.getGetUrl());
+            if (this.getKey() != null) {
+                getUrl = new URL(getUrl.toString() + "#" + CryptoHelper.bytesToHex(this.getKey()));
+            }
+
+            this.getMessage().getFileParams().setFileStatus(FileStatus.UPLOADED);
+            MessageUtil.updateFileParams(this.getMessage(), getUrl);
+        } catch (MalformedURLException e) {
+            Logging.e("httpupload", "Not a valid get url");
+        }
+
+        super.transferred();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpFileUploader.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpFileUploader.java
new file mode 100644
index 00000000..9c949ed9
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpFileUploader.java
@@ -0,0 +1,151 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.upload;
+
+import android.os.PowerManager;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.net.UnknownHostException;
+import java.util.Scanner;
+
+import javax.net.ssl.HttpsURLConnection;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferFailureReason;
+import de.thedevstack.conversationsplus.utils.StreamUtil;
+import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload.HttpUpload;
+
+import eu.siacs.conversations.entities.DownloadableFile;
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.http.HttpConnectionManager;
+import eu.siacs.conversations.persistance.FileBackend;
+
+public class HttpFileUploader implements Runnable {
+    private static final String HTTP_METHOD = "PUT";
+    private static final String MIME_REQUEST_PROPERTY_NAME = "Content-Type";
+    private static final String USER_AGENT_REQUEST_PROPERTY_NAME = "User-Agent";
+    private static final int BUFFER_LENGTH = 4096;
+    private final HttpFileTransferEntity entity;
+
+    public HttpFileUploader(HttpFileTransferEntity entity) {
+        this.entity = entity;
+    }
+
+    @Override
+    public void run() {
+        this.upload();
+    }
+
+    private void upload() {
+        OutputStream os = null;
+
+        HttpURLConnection connection = null;
+        InputStream fileInputStream = null;
+        DownloadableFile file = this.entity.getFile();
+        PowerManager.WakeLock wakeLock = ConversationsPlusApplication.createPartialWakeLock("http_upload_" + entity.getMessage().getUuid());
+        try {
+            wakeLock.acquire();
+            Logging.d("httpupload", "uploading file to " + this.entity.getPutUrl());
+            URL putUrl = new URL(this.entity.getPutUrl());
+            fileInputStream = this.entity.getFileInputStream();
+            connection = (HttpURLConnection) putUrl.openConnection();
+
+            if (connection instanceof HttpsURLConnection) {
+                HttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, true);
+            }
+            connection.setRequestMethod(HTTP_METHOD);
+            connection.setFixedLengthStreamingMode((int) file.getExpectedSize());
+            String mime = file.getMimeType();
+            connection.setRequestProperty(MIME_REQUEST_PROPERTY_NAME, mime == null ? HttpUpload.DEFAULT_MIME_TYPE : mime);
+            connection.setRequestProperty(USER_AGENT_REQUEST_PROPERTY_NAME, ConversationsPlusApplication.getNameAndVersion());
+            connection.setDoOutput(true);
+            connection.connect();
+            os = connection.getOutputStream();
+            int count = -1;
+            byte[] buffer = new byte[BUFFER_LENGTH];
+            while (((count = fileInputStream.read(buffer)) != -1) && !this.entity.isCanceled()) {
+                this.entity.updateProgress(count);
+                os.write(buffer, 0, count);
+                UiUpdateHelper.updateConversationUi();
+            }
+            os.flush();
+            os.close();
+            fileInputStream.close();
+            int code = connection.getResponseCode();
+            if (code == 200 || code == 201) {
+                Logging.d("httpupload", "finished uploading file");
+                this.entity.transferred();
+
+                FileBackend.updateMediaScanner(file, XmppConnectionServiceAccessor.xmppConnectionService); // Why???
+
+                // Send the URL to the counterpart
+                Message message = this.entity.getMessage();
+                message.setBody(this.entity.getGetUrl());
+                message.setCounterpart(message.getConversation().getJid().toBareJid());
+                if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
+                    XmppConnectionServiceAccessor.xmppConnectionService.getPgpEngine().encrypt(message, new HttpUploadedFileEncryptionUiCallback(this.entity));
+                } else {
+                    XmppConnectionServiceAccessor.xmppConnectionService.resendMessage(message, this.entity.isDelayed());
+                }
+            } else {
+                String httpResponseMessage = this.getErrorStreamContent(connection);
+                String errorMessage = "file upload failed: http code (" + code + ") " + httpResponseMessage;
+                Logging.e("httpupload", errorMessage);
+                FileTransferFailureReason failureReason = null;
+                switch (code) {
+                    case 403:
+                        failureReason = FileTransferFailureReason.createLimitedRecoverableFailureReason(errorMessage);
+                        break;
+                    case 404:
+                        failureReason = FileTransferFailureReason.createNonRecoverableFailureReason("Upload URL not found");
+                        break;
+                    case 500:
+                        failureReason = FileTransferFailureReason.createNonRecoverableFailureReason("Internal Server Error");
+                        break;
+                    default:
+                        failureReason = FileTransferFailureReason.createRecoverableFailureReason(errorMessage);
+                }
+                this.entity.fail(failureReason);
+            }
+        } catch (UnknownHostException e) {
+            Logging.e("httpupload", "File upload failed due to unknown host. " + e.getMessage());
+            //if (!HAS_INTERNET_CONNECTION) {
+            this.entity.fail(FileTransferFailureReason.createRecoverableFailureReason(e, "Missing internet connection"));
+            //}
+        } catch (IOException e) {
+            String httpResponseMessage = this.getErrorStreamContent(connection);
+            Logging.e("httpupload", ((null != httpResponseMessage) ? ("http response: " + httpResponseMessage + ", ") : "") + "exception message: " + e.getMessage());
+            // TODO: Differentiate IOException while internet connection wasn't available and others
+            this.entity.fail(FileTransferFailureReason.createRecoverableFailureReason(e, httpResponseMessage));
+        } finally {
+            StreamUtil.close(os);
+            StreamUtil.close(fileInputStream);
+            if (connection != null) {
+                connection.disconnect();
+            }
+            wakeLock.release();
+        }
+    }
+
+    private String getErrorStreamContent(HttpURLConnection connection) {
+        InputStream errorStream = null;
+        String httpResponseMessage = null;
+        try {
+            errorStream = connection.getErrorStream();
+            if (null != errorStream) {
+                Scanner scanner = new Scanner(errorStream).useDelimiter("\\A");
+                if (scanner.hasNext()) {
+                    httpResponseMessage = scanner.next();
+                }
+            }
+        } finally {
+            StreamUtil.close(errorStream);
+        }
+        return httpResponseMessage;
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadFileTransferService.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadFileTransferService.java
new file mode 100644
index 00000000..7fe12dc6
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadFileTransferService.java
@@ -0,0 +1,92 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.upload;
+
+import android.util.Pair;
+
+import java.io.FileNotFoundException;
+import java.io.InputStream;
+
+import de.thedevstack.android.logcat.Logging;
+import eu.siacs.conversations.services.AbstractConnectionManager;
+import de.thedevstack.conversationsplus.services.FileTransferService;
+import de.thedevstack.conversationsplus.services.filetransfer.AbstractFileTransferService;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
+import de.thedevstack.conversationsplus.utils.XmppSendUtil;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload.HttpUpload;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload.HttpUploadRequestSlotPacketGenerator;
+
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.entities.DownloadableFile;
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.xmpp.jid.Jid;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public class HttpUploadFileTransferService extends AbstractFileTransferService implements FileTransferService {
+
+    public HttpUploadFileTransferService() {
+    }
+
+    /**
+     * Transfers a file for the corresponding message.
+     *
+     * @param message the message containing the file to transfer
+     * @return <code>true</code> if the file transfer was started successfully, <code>false</code> otherwise
+     */
+    @Override
+    public boolean transferFile(Message message) {
+        return this.transferFile(message, false);
+    }
+
+    /**
+     * Transfers a file for the corresponding message.
+     *
+     * @param message the message containing the file to transfer
+     * @param delay   whether the message is delayed or not
+     * @return <code>true</code> if the file transfer was started successfully, <code>false</code> otherwise
+     */
+    @Override
+    public boolean transferFile(Message message, boolean delay) {
+        Logging.d("httpupload", "Starting to upload file");
+        boolean started = false;
+        try {
+            final HttpFileTransferEntity entity = new HttpFileTransferEntity(message, delay);
+            this.addStatusListenerToEntity(entity);
+            entity.startAttempt();
+            Account account = message.getConversation().getAccount();
+            DownloadableFile file = entity.getFile();
+            Pair<InputStream, Integer> inputStreamAndExpectedSize = AbstractConnectionManager.createInputStream(file, true);
+
+            entity.setFileInputStream(inputStreamAndExpectedSize.first);
+            file.setExpectedSize(inputStreamAndExpectedSize.second);
+
+            Logging.d("httpupload", "Requesting upload slot for file upload");
+            Jid host = account.getXmppConnection().findDiscoItemByFeature(HttpUpload.NAMESPACE);
+            IqPacket request = HttpUploadRequestSlotPacketGenerator.generate(host, file.getName(), file.getSize(), file.getMimeType());
+            XmppSendUtil.sendIqPacket(account, request, new HttpUploadSlotRequestReceived(entity));
+            MessageUtil.markMessage(message, Message.STATUS_UNSEND);
+
+            Logging.d("httpupload", "Upload slot for file upload requested");
+            started = true;
+        } catch (FileNotFoundException e) {
+            Logging.e("httpupload", "Could not find file, exception message: " + e.getMessage());
+        }
+        return started;
+    }
+
+    /**
+     * Checks whether a message can be sent using this service or not.
+     *
+     * @param message the message to be checked
+     * @return <code>true</code> if the message can be processed, <code>false</code> otherwise
+     */
+    @Override
+    public boolean accept(Message message) {
+        return null != message
+                && null != message.getConversation()
+                && null != message.getConversation().getAccount()
+                && null != message.getFileParams()
+                && message.getConversation().getAccount().httpUploadAvailable(message.getFileParams().getSize());
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadSlotRequestReceived.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadSlotRequestReceived.java
new file mode 100644
index 00000000..5a12a4d4
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadSlotRequestReceived.java
@@ -0,0 +1,36 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.upload;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferFailureReason;
+import de.thedevstack.conversationsplus.xmpp.exceptions.XmppException;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload.HttpUploadSlot;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload.SlotPacketParser;
+
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.xmpp.OnIqPacketReceived;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public class HttpUploadSlotRequestReceived implements OnIqPacketReceived {
+    private final HttpFileTransferEntity entity;
+
+    public HttpUploadSlotRequestReceived(HttpFileTransferEntity entity) {
+        this.entity = entity;
+    }
+
+    @Override
+    public void onIqPacketReceived(Account account, IqPacket packet) {
+        try {
+            HttpUploadSlot slot = SlotPacketParser.parseGetAndPutUrl(packet);
+            this.entity.setSlot(slot);
+            if (!this.entity.isCanceled()) {
+                new Thread(new HttpFileUploader(this.entity)).start();
+            }
+        } catch (XmppException e) {
+            Logging.e("httpupload", e.getMessage());
+            this.entity.fail(FileTransferFailureReason.createNonRecoverableFailureReason(e));
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadedFileEncryptionUiCallback.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadedFileEncryptionUiCallback.java
new file mode 100644
index 00000000..f084bffa
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/http/upload/HttpUploadedFileEncryptionUiCallback.java
@@ -0,0 +1,35 @@
+package de.thedevstack.conversationsplus.services.filetransfer.http.upload;
+
+import android.app.PendingIntent;
+
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferFailureReason;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
+
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.ui.UiCallback;
+
+/**
+ *
+ */
+public class HttpUploadedFileEncryptionUiCallback implements UiCallback<Message> {
+    private final HttpFileTransferEntity entity;
+
+    public HttpUploadedFileEncryptionUiCallback(HttpFileTransferEntity entity) {
+        this.entity = entity;
+    }
+
+    @Override
+    public void success(Message message) {
+        XmppConnectionServiceAccessor.xmppConnectionService.resendMessage(message, this.entity.isDelayed());
+    }
+
+    @Override
+    public void error(int errorCode, Message object) {
+        this.entity.fail(FileTransferFailureReason.createLimitedRecoverableFailureReason("Failed to encrypt"));
+    }
+
+    @Override
+    public void userInputRequried(PendingIntent pi, Message object) {
+        this.entity.fail(FileTransferFailureReason.createLimitedRecoverableFailureReason("Failed to encrypt, user input would have been required"));
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/jingle/JingleFileTransferService.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/jingle/JingleFileTransferService.java
new file mode 100644
index 00000000..e48f30e5
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/jingle/JingleFileTransferService.java
@@ -0,0 +1,53 @@
+package de.thedevstack.conversationsplus.services.filetransfer.jingle;
+
+import de.thedevstack.conversationsplus.services.FileTransferService;
+import de.thedevstack.conversationsplus.services.filetransfer.AbstractFileTransferService;
+
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.xmpp.jingle.JingleConnection;
+import eu.siacs.conversations.xmpp.jingle.JingleConnectionManager;
+
+/**
+ *
+ */
+public class JingleFileTransferService extends AbstractFileTransferService implements FileTransferService {
+    private final JingleConnectionManager jingleConnectionManager;
+
+    public JingleFileTransferService() {
+        this.jingleConnectionManager = new JingleConnectionManager();
+    }
+    /**
+     * Transfers a file for the corresponding message.
+     *
+     * @param message the message containing the file to transfer
+     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
+     */
+    @Override
+    public boolean transferFile(Message message) {
+        return this.transferFile(message, false);
+    }
+
+    /**
+     * Transfers a file for the corresponding message.
+     *
+     * @param message the message containing the file to transfer
+     * @param delay   whether the message is delayed or not
+     * @return <code>true</code> if the file transfer was successful, <code>false</code> otherwise
+     */
+    @Override
+    public boolean transferFile(Message message, boolean delay) {
+        JingleConnection jingleConnection = this.jingleConnectionManager.createNewConnection(message);
+        return null != jingleConnection;
+    }
+
+    /**
+     * Checks whether a message can be sent using this service or not.
+     *
+     * @param message the message to be checked
+     * @return <code>true</code> if the message can be processed, <code>false</code> otherwise
+     */
+    @Override
+    public boolean accept(Message message) {
+        return message.fixCounterpart(); // No clue why - but this seems to be the check for jingle file transfer
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/MessageDetailsDialog.java b/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/MessageDetailsDialog.java
index 4f6cffb4..1b44d09b 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/MessageDetailsDialog.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/MessageDetailsDialog.java
@@ -9,6 +9,7 @@ import java.util.Date;
 
 import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.ConversationsPlusColors;
+import de.thedevstack.conversationsplus.entities.FileParams;
 import de.thedevstack.conversationsplus.utils.ui.TextViewUtil;
 
 import eu.siacs.conversations.R;
@@ -60,10 +61,10 @@ public class MessageDetailsDialog extends AbstractAlertDialog {
             Logging.d("messagedetailsfile", "File is stored in path: " + message.getRelativeFilePath());
             view.findViewById(R.id.dlgMsgDetFileTable).setVisibility(View.VISIBLE);
             if (null != message.getFileParams()) {
-                Message.FileParams params = message.getFileParams();
-                TextViewUtil.setText(view, R.id.dlgMsgDetFileSize, UIHelper.getHumanReadableFileSize(params.size));
+                FileParams params = message.getFileParams();
+                TextViewUtil.setText(view, R.id.dlgMsgDetFileSize, UIHelper.getHumanReadableFileSize(params.getSize()));
+                TextViewUtil.setText(view, R.id.dlgMsgDetFileMimeType, params.getMimeType());
             }
-            TextViewUtil.setText(view, R.id.dlgMsgDetFileMimeType, message.getMimeType());
 
             TextViewUtil.setText(view, R.id.dlgMsgDetFileHttpUploaded, message.isHttpUploaded() ? R.string.cplus_yes : R.string.cplus_no);
         }
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/SimpleConfirmDialog.java b/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/SimpleConfirmDialog.java
new file mode 100644
index 00000000..6bf9c563
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/SimpleConfirmDialog.java
@@ -0,0 +1,37 @@
+package de.thedevstack.conversationsplus.ui.dialogs;
+
+import android.content.Context;
+import android.content.DialogInterface;
+
+import de.thedevstack.conversationsplus.ui.listeners.SimpleUserDecisionCallback;
+
+import eu.siacs.conversations.R;
+
+/**
+ * A dialog to give the user the choice to decide whether to do something or not.
+ * A UserDecisionListener is used to provide the functionality to be performed by clicking on yes, or no.
+ */
+public class SimpleConfirmDialog extends AbstractAlertDialog {
+    protected final SimpleUserDecisionCallback callback;
+
+    public SimpleConfirmDialog(Context context, String title, SimpleUserDecisionCallback userDecisionCallback) {
+        super(context, title);
+        this.callback = userDecisionCallback;
+        this.setPositiveButton(R.string.cplus_ok, new ConfirmOnClickListener());
+        this.setNegativeButton(R.string.cancel, null);
+    }
+
+    public SimpleConfirmDialog(Context context, int titleTextId, SimpleUserDecisionCallback userDecisionCallback) {
+        super(context, titleTextId);
+        this.callback = userDecisionCallback;
+        this.setPositiveButton(R.string.cplus_ok, new ConfirmOnClickListener());
+        this.setNegativeButton(R.string.cancel, null);
+    }
+
+    private class ConfirmOnClickListener implements DialogInterface.OnClickListener {
+        @Override
+        public void onClick(DialogInterface dialog, int which) {
+            callback.onYes();
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/UserDecisionDialog.java b/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/UserDecisionDialog.java
index c29832a5..3305e8e1 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/UserDecisionDialog.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/dialogs/UserDecisionDialog.java
@@ -15,13 +15,11 @@ import eu.siacs.conversations.R;
  * The user also has the choice to save his answer for the future.
  * A UserDecisionListener is used to provide the functionality to be performed by clicking on yes, or no.
  */
-public class UserDecisionDialog extends AbstractAlertDialog {
-    protected final UserDecisionListener listener;
+public class UserDecisionDialog extends SimpleConfirmDialog {
     protected final CheckBox rememberCheckBox;
 
     public UserDecisionDialog(Activity context, int questionResourceId, UserDecisionListener userDecisionListener) {
-        super(context, questionResourceId);
-        this.listener = userDecisionListener;
+        super(context, questionResourceId, userDecisionListener);
 
         int viewId = R.layout.dialog_userdecision;
         View view = context.getLayoutInflater().inflate(viewId, null);
@@ -36,10 +34,10 @@ public class UserDecisionDialog extends AbstractAlertDialog {
     public void decide(UserDecision baseDecision) {
         switch (baseDecision) {
             case ALWAYS:
-                this.listener.onYes();
+                this.callback.onYes();
                 break;
             case NEVER:
-                this.listener.onNo();
+                this.callback.onNo();
                 break;
             case ASK:
                 this.show();
@@ -51,9 +49,9 @@ public class UserDecisionDialog extends AbstractAlertDialog {
 
         @Override
         public void onClick(DialogInterface dialog, int which) {
-            listener.onYes();
+            callback.onYes();
             if (rememberCheckBox.isChecked()) {
-                listener.onRemember(UserDecision.ALWAYS);
+                ((UserDecisionListener)callback).onRemember(UserDecision.ALWAYS);
             }
         }
     }
@@ -62,9 +60,9 @@ public class UserDecisionDialog extends AbstractAlertDialog {
 
         @Override
         public void onClick(DialogInterface dialog, int which) {
-            listener.onNo();
+            callback.onNo();
             if (rememberCheckBox.isChecked()) {
-                listener.onRemember(UserDecision.NEVER);
+                ((UserDecisionListener)callback).onRemember(UserDecision.NEVER);
             }
         }
     }
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/DeleteFileCallback.java b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/DeleteFileCallback.java
new file mode 100644
index 00000000..222e473b
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/DeleteFileCallback.java
@@ -0,0 +1,45 @@
+package de.thedevstack.conversationsplus.ui.listeners;
+
+import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
+
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.entities.Transferable;
+import eu.siacs.conversations.entities.TransferablePlaceholder;
+import eu.siacs.conversations.persistance.FileBackend;
+
+/**
+ * Callback for the user decision if a file should be deleted or not.
+ */
+public class DeleteFileCallback implements SimpleUserDecisionCallback {
+    private final Message message;
+
+    public DeleteFileCallback(Message message) {
+        this.message = message;
+    }
+
+    /**
+     * Deletes the file and updates the UI.
+     */
+    private void deleteFile() {
+        if (FileBackend.deleteFile(this.message)) {
+            this.message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_DELETED));
+            UiUpdateHelper.updateConversationUi();
+        }
+    }
+
+    /**
+     * Deletes the file.
+     */
+    @Override
+    public void onYes() {
+        this.deleteFile();
+    }
+
+    /**
+     * Nothing to do in this case.
+     */
+    @Override
+    public void onNo() {
+        // Nothing to do
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java
index 0cfee1d8..dec6b885 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/ResizePictureUserDecisionListener.java
@@ -13,6 +13,8 @@ import java.io.InputStream;
 import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
+import de.thedevstack.conversationsplus.entities.FileParams;
+import de.thedevstack.conversationsplus.enums.FileStatus;
 import de.thedevstack.conversationsplus.enums.UserDecision;
 import de.thedevstack.conversationsplus.exceptions.UiException;
 import de.thedevstack.conversationsplus.utils.ImageUtil;
@@ -97,20 +99,18 @@ public class ResizePictureUserDecisionListener implements UserDecisionListener {
     @Override
     public void onYes() {
         this.showPrepareFileToast();
-        final Message message;
-        if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
-            message = new Message(conversation, "", Message.ENCRYPTION_DECRYPTED);
-        } else {
-            message = new Message(conversation, "", conversation.getNextEncryption());
-        }
-        message.setCounterpart(conversation.getNextCounterpart());
-        message.setType(Message.TYPE_IMAGE);
+        final Message message = createMessage();
         ConversationsPlusApplication.executeFileAdding(new OnYesRunnable(message, uri));
     }
 
     @Override
     public void onNo() {
         this.showPrepareFileToast();
+        final Message message = createMessage();
+        ConversationsPlusApplication.executeFileAdding(new OnNoRunnable(message, uri));
+    }
+
+    protected Message createMessage() {
         final Message message;
         if (conversation.getNextEncryption() == Message.ENCRYPTION_PGP) {
             message = new Message(conversation, "", Message.ENCRYPTION_DECRYPTED);
@@ -118,8 +118,11 @@ public class ResizePictureUserDecisionListener implements UserDecisionListener {
             message = new Message(conversation, "", conversation.getNextEncryption());
         }
         message.setCounterpart(conversation.getNextCounterpart());
-        message.setType(Message.TYPE_IMAGE);
-        ConversationsPlusApplication.executeFileAdding(new OnNoRunnable(message, uri));
+        //message.setType(Message.TYPE_IMAGE);
+        message.setFileParams(new FileParams());
+        message.getFileParams().setFileStatus(FileStatus.NEEDS_UPLOAD);
+
+        return message;
     }
 
     @Override
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/SimpleUserDecisionCallback.java b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/SimpleUserDecisionCallback.java
new file mode 100644
index 00000000..3ed49c2d
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/SimpleUserDecisionCallback.java
@@ -0,0 +1,9 @@
+package de.thedevstack.conversationsplus.ui.listeners;
+
+/**
+ * Callback to be executed on a user decision.
+ */
+public interface SimpleUserDecisionCallback {
+    void onYes();
+    void onNo();
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/UserDecisionListener.java b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/UserDecisionListener.java
index fbee6290..45576225 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/listeners/UserDecisionListener.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/listeners/UserDecisionListener.java
@@ -3,10 +3,8 @@ package de.thedevstack.conversationsplus.ui.listeners;
 import de.thedevstack.conversationsplus.enums.UserDecision;
 
 /**
- * Created by tzur on 31.10.2015.
+ * Callback to be executed on a user decision with the possibility to remember the decision.
  */
-public interface UserDecisionListener {
-    void onYes();
-    void onNo();
+public interface UserDecisionListener extends SimpleUserDecisionCallback {
     void onRemember(UserDecision decision);
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/ConversationUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/ConversationUtil.java
index 958e9de8..25c8b3ba 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/ConversationUtil.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/ConversationUtil.java
@@ -3,6 +3,7 @@ package de.thedevstack.conversationsplus.utils;
 import android.net.Uri;
 
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.enums.FileStatus;
 import de.thedevstack.conversationsplus.exceptions.FileCopyException;
 
 import eu.siacs.conversations.crypto.PgpEngine;
@@ -45,10 +46,12 @@ public class ConversationUtil {
             message = new Message(conversation, "", conversation.getNextEncryption());
         }
         message.setCounterpart(conversation.getNextCounterpart());
-        message.setType(Message.TYPE_FILE);
+        //message.setType(Message.TYPE_FILE);
+        message.getFileParams().setFileStatus(FileStatus.NEEDS_UPLOAD);
         String path = FileUtils.getPath(uri);
         if (path != null) {
-            message.setRelativeFilePath(path);
+            message.getFileParams().setPath(path);
+            message.setRelativeFilePath(path); // TODO: Remove when everything is moved to fileparams
             MessageUtil.updateFileParams(message);
             if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
                 PgpEngine.getInstance().encrypt(message, callback);
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java
index b28e6f1c..0edf6ad0 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/ImageUtil.java
@@ -338,20 +338,28 @@ public final class ImageUtil {
     public static int calcSampleSize(Uri image, int size) throws FileNotFoundException {
         BitmapFactory.Options options = new BitmapFactory.Options();
         options.inJustDecodeBounds = true;
-        BitmapFactory.decodeStream(StreamUtil.openInputStreamFromContentResolver(image), null, options);
-        return calcSampleSize(options, size);
+        Bitmap bmp = BitmapFactory.decodeStream(StreamUtil.openInputStreamFromContentResolver(image), null, options);
+        int height = options.outHeight;
+        int width = options.outWidth;
+        if (null != bmp) {
+            bmp.recycle();
+        }
+        return calcSampleSize(width, height, size);
     }
 
     public static int calcSampleSize(File image, int size) {
         BitmapFactory.Options options = new BitmapFactory.Options();
         options.inJustDecodeBounds = true;
-        BitmapFactory.decodeFile(image.getAbsolutePath(), options);
-        return calcSampleSize(options, size);
-    }
-
-    public static int calcSampleSize(BitmapFactory.Options options, int size) {
+        Bitmap bmp = BitmapFactory.decodeFile(image.getAbsolutePath(), options);
         int height = options.outHeight;
         int width = options.outWidth;
+        if (null != bmp) {
+            bmp.recycle();
+        }
+        return calcSampleSize(width, height, size);
+    }
+
+    private static int calcSampleSize(int width, int height, int size) {
         int inSampleSize = 1;
 
         if (height > size || width > size) {
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java
index ca24bd1d..37e39285 100644
--- a/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/MessageUtil.java
@@ -1,5 +1,6 @@
 package de.thedevstack.conversationsplus.utils;
 
+import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
 
 import java.net.URL;
@@ -7,6 +8,8 @@ import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.entities.FileParams;
+import de.thedevstack.conversationsplus.enums.FileStatus;
 
 import eu.siacs.conversations.entities.Conversation;
 import eu.siacs.conversations.entities.DownloadableFile;
@@ -19,6 +22,29 @@ import eu.siacs.conversations.persistance.FileBackend;
  */
 public final class MessageUtil {
 
+    public static boolean needsDownload(Message message) {
+        FileStatus fileStatus = (null != message.getFileParams()) ? message.getFileParams().getFileStatus() : null;
+        return (null != fileStatus && (fileStatus == FileStatus.NEEDS_DOWNLOAD
+                || fileStatus == FileStatus.UNDEFINED))
+                && message.treatAsDownloadable() != Message.Decision.NEVER;
+    }
+
+    public static boolean isMessageSent(Message message) {
+        switch (message.getStatus()) {
+            case Message.STATUS_SEND:
+            case Message.STATUS_SEND_DISPLAYED:
+            case Message.STATUS_SEND_RECEIVED:
+                return true;
+            default:
+                return false;
+        }
+    }
+
+    public static void setAndSaveFileStatus(Message message, FileStatus fileStatus) {
+        message.getFileParams().setFileStatus(fileStatus);
+        DatabaseBackend.getInstance().updateMessage(message);
+        UiUpdateHelper.updateConversationUi();
+    }
 
     public static boolean markMessage(Conversation conversation, String uuid, int status) {
         if (uuid == null) {
@@ -67,7 +93,7 @@ public final class MessageUtil {
 
     public static void updateMessageWithImageDetails(Message message, String filePath, long size, int imageWidth, int imageHeight) {
         message.setRelativeFilePath(filePath);
-        MessageUtil.updateMessageBodyWithImageParams(message, size, imageWidth, imageHeight);
+        MessageUtil.updateMessageWithFileParams(message, null, size, imageWidth, imageHeight);
     }
 
     public static void updateFileParams(Message message) {
@@ -81,42 +107,37 @@ public final class MessageUtil {
         if (message.getType() == Message.TYPE_IMAGE || file.getMimeType().startsWith("image/")) {
             BitmapFactory.Options options = new BitmapFactory.Options();
             options.inJustDecodeBounds = true;
-            BitmapFactory.decodeFile(file.getAbsolutePath(), options);
+            Bitmap bmp = BitmapFactory.decodeFile(file.getAbsolutePath(), options);
             imageHeight = options.outHeight;
             imageWidth = options.outWidth;
+            if (null != bmp) {
+                bmp.recycle();
+            }
         }
 
-        MessageUtil.updateMessageBodyWithFileParams(message, url, file.getSize(), imageWidth, imageHeight);
-    }
-
-    private static void updateMessageBodyWithFileParams(Message message, URL url, long fileSize, int imageWidth, int imageHeight) {
-        message.setBody(MessageUtil.getMessageBodyWithImageParams(url, fileSize, imageWidth, imageHeight));
-    }
-
-    private static void updateMessageBodyWithImageParams(Message message, long size, int imageWidth, int imageHeight) {
-        MessageUtil.updateMessageBodyWithImageParams(message, null, size, imageWidth, imageHeight);
+        MessageUtil.updateMessageWithFileParams(message, url, file.getSize(), imageWidth, imageHeight);
     }
 
-    private static void updateMessageBodyWithImageParams(Message message, URL url, long size, int imageWidth, int imageHeight) {
-        message.setBody(MessageUtil.getMessageBodyWithImageParams(url, size, imageWidth, imageHeight));
-    }
-
-    private static String getMessageBodyWithImageParams(URL url, long size, int imageWidth, int imageHeight) {
-        StringBuilder sb = new StringBuilder();
+    private static void updateMessageWithFileParams(Message message, URL url, long size, int imageWidth, int imageHeight) {
+        FileParams fileParams = message.getFileParams();
+        if (null == fileParams) {
+            fileParams = new FileParams();
+        }
+        fileParams.setSize(size);
         if (null != url) {
-            sb.append(url.toString());
-            sb.append('|');
+            fileParams.setUrl(url.toString());
         }
-        sb.append(size);
         if (-1 < imageWidth) {
-            sb.append('|');
-            sb.append(imageWidth);
+            fileParams.setWidth(imageWidth);
         }
         if (-1 < imageHeight) {
-            sb.append('|');
-            sb.append(imageHeight);
+            fileParams.setHeight(imageHeight);
+        }
+        String relativeFilePathFromMessage = message.getRelativeFilePath();
+        if (null != relativeFilePathFromMessage && relativeFilePathFromMessage.startsWith("/")) {
+            fileParams.setPath(relativeFilePathFromMessage);
         }
-        return sb.toString();
+        message.setFileParams(fileParams);
     }
 
     private MessageUtil() {
diff --git a/src/main/java/de/thedevstack/conversationsplus/utils/SimpleCryptoUtil.java b/src/main/java/de/thedevstack/conversationsplus/utils/SimpleCryptoUtil.java
new file mode 100644
index 00000000..0a8c80d1
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/utils/SimpleCryptoUtil.java
@@ -0,0 +1,110 @@
+package de.thedevstack.conversationsplus.utils;
+
+
+import java.security.InvalidKeyException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+import javax.crypto.BadPaddingException;
+import javax.crypto.Cipher;
+import javax.crypto.IllegalBlockSizeException;
+import javax.crypto.NoSuchPaddingException;
+import javax.crypto.SecretKey;
+import javax.crypto.spec.SecretKeySpec;
+
+/**
+ *
+ */
+public final class SimpleCryptoUtil {
+
+    public static String encrypt(String seed, String cleartext) {
+        String result = null;
+        if (null != seed && null != cleartext) {
+            try {
+                byte[] rawKey = getRawKey(seed.getBytes());
+                byte[] encryptedBytes = encrypt(rawKey, cleartext.getBytes());
+                result = toHex(encryptedBytes);
+            } catch (NoSuchAlgorithmException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | NoSuchPaddingException e) {
+                // FIXME
+            }
+        }
+
+        return result;
+    }
+
+    public static String decrypt(String seed, String encrypted) {
+        String result = null;
+        if (null != seed && null != encrypted) {
+            try {
+                byte[] rawKey = getRawKey(seed.getBytes());
+                byte[] enc = toByte(encrypted);
+                byte[] decryptedBytes = decrypt(rawKey, enc);
+                result = new String(decryptedBytes);
+            } catch (NoSuchAlgorithmException | InvalidKeyException | IllegalBlockSizeException | BadPaddingException | NoSuchPaddingException e) {
+                // FIXME
+            }
+        }
+
+        return result;
+    }
+
+    private static byte[] encrypt(byte[] raw, byte[] clear) throws IllegalBlockSizeException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, NoSuchPaddingException {
+        byte[] encrypted = doCipherOperation(raw, clear, Cipher.ENCRYPT_MODE);
+        return encrypted;
+    }
+
+    private static byte[] decrypt(byte[] raw, byte[] encrypted) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
+        byte[] decrypted = doCipherOperation(raw, encrypted, Cipher.DECRYPT_MODE);
+        return decrypted;
+    }
+
+    private static byte[] doCipherOperation(byte[] raw, byte[] input, int mode) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException, IllegalBlockSizeException, BadPaddingException {
+        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
+        Cipher cipher = Cipher.getInstance("AES");
+        cipher.init(mode, skeySpec);
+
+        return cipher.doFinal(input);
+    }
+
+    private static byte[] getRawKey(byte[] seed) throws NoSuchAlgorithmException {
+        MessageDigest md = MessageDigest.getInstance("MD5");
+        byte[] md5Bytes = md.digest(seed); // 128 Bit = 16 byte
+        SecretKey skey = new SecretKeySpec(md5Bytes, "AES");
+        byte[] raw = skey.getEncoded();
+        return raw;
+    }
+
+    public static byte[] toByte(String hexString) {
+        int len = hexString.length() / 2;
+        byte[] result = new byte[len];
+        for (int i = 0; i < len; i++) {
+            result[i] = Integer.valueOf(hexString.substring(2 * i, 2 * i + 2), 16).byteValue();
+        }
+        return result;
+    }
+
+    public static String toHex(byte[] buf) {
+        if (buf == null) {
+            return null;
+        }
+        StringBuffer result = new StringBuffer(2 * buf.length);
+        for (int i = 0; i < buf.length; i++) {
+            appendHex(result, buf[i]);
+        }
+        return result.toString();
+    }
+
+    private final static String HEX = "0123456789ABCDEF";
+
+    private static void appendHex(StringBuffer sb, byte b) {
+        sb.append(HEX.charAt((b >> 4) & 0x0f)).append(HEX.charAt(b & 0x0f));
+    }
+
+    /**
+     * private constructor to avoid instantiation
+     */
+    private SimpleCryptoUtil() {
+        // private constructor to avoid instantiation
+    }
+}
+
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/IqPacketParser.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/IqPacketParser.java
new file mode 100644
index 00000000..eee5b0aa
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/IqPacketParser.java
@@ -0,0 +1,52 @@
+package de.thedevstack.conversationsplus.xmpp;
+
+import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredContentException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredElementException;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ *
+ */
+public abstract class IqPacketParser {
+    public static Element findRequiredChild(Element element, String elementName, String namespace) throws MissingRequiredElementException {
+        Element child = findChild(element, elementName, namespace);
+        if (child == null) {
+            throw new MissingRequiredElementException(elementName, namespace, element);
+        }
+        return child;
+    }
+
+    public static Element findChild(Element element, String elementName, String namespace) {
+        if (null == element) {
+            return null;
+        }
+        return element.findChild(elementName, namespace);
+    }
+
+    public static String findRequiredChildContent(Element element, String elementName) throws MissingRequiredContentException {
+        if (null == element) {
+            return null;
+        }
+        String childContent = element.findChildContent(elementName);
+        if (null == childContent) {
+            throw new MissingRequiredContentException(elementName, element);
+        }
+        return childContent;
+    }
+
+    public static String findRequiredChildContent(Element element, String elementName, String namespace) throws MissingRequiredContentException {
+        String childContent = findChildContent(element, elementName, namespace);
+        if (null == childContent) {
+            throw new MissingRequiredContentException(elementName, namespace, element);
+        }
+        return childContent;
+    }
+
+    public static String findChildContent(Element element, String elementName, String namespace) {
+        if (null == element) {
+            return null;
+        }
+        return element.findChildContent(elementName, namespace);
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/BadRequestIqErrorException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/BadRequestIqErrorException.java
new file mode 100644
index 00000000..120ef495
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/BadRequestIqErrorException.java
@@ -0,0 +1,17 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public class BadRequestIqErrorException extends IqPacketErrorException {
+    public BadRequestIqErrorException(Element context, String errorMessage) {
+        super(context, errorMessage);
+    }
+
+    @Override
+    public String getMessage() {
+        return "Bad Request: " + super.getMessage();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/InternalServerErrorException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/InternalServerErrorException.java
new file mode 100644
index 00000000..1a1cded2
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/InternalServerErrorException.java
@@ -0,0 +1,17 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public class InternalServerErrorException extends IqPacketErrorException {
+    public InternalServerErrorException(Element packet, String errorText) {
+        super(packet, errorText);
+    }
+
+    @Override
+    public String getMessage() {
+        return "Internal Server Error: " + super.getMessage();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/IqPacketErrorException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/IqPacketErrorException.java
new file mode 100644
index 00000000..65e02688
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/IqPacketErrorException.java
@@ -0,0 +1,20 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public class IqPacketErrorException extends XmppException {
+    private final String iqErrorText;
+
+    public IqPacketErrorException(Element context, String errorMessage) {
+        super(context);
+        this.iqErrorText = errorMessage;
+    }
+
+    @Override
+    public String getMessage() {
+        return this.iqErrorText + " in context: " + this.getContext();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredContentException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredContentException.java
new file mode 100644
index 00000000..060bb618
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredContentException.java
@@ -0,0 +1,26 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ *
+ */
+public class MissingRequiredContentException extends XmppException {
+    private String elementName;
+    private String namespace;
+
+    public MissingRequiredContentException(String elementName, Element context) {
+        super(context);
+        this.elementName = elementName;
+    }
+
+    public MissingRequiredContentException(String elementName, String namespace, Element context) {
+        this(elementName, context);
+        this.namespace = namespace;
+    }
+
+    @Override
+    public String getMessage() {
+        return "Missing required element content " + ((namespace != null) ? namespace + ":" : "") + elementName + " in context " + getContext();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredElementException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredElementException.java
new file mode 100644
index 00000000..de24262f
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredElementException.java
@@ -0,0 +1,26 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ *
+ */
+public class MissingRequiredElementException extends XmppException {
+    private String elementName;
+    private String namespace;
+
+    public MissingRequiredElementException(String elementName, Element context) {
+        super(context);
+        this.elementName = elementName;
+    }
+
+    public MissingRequiredElementException(String elementName, String namespace, Element context) {
+        this(elementName, context);
+        this.namespace = namespace;
+    }
+
+    @Override
+    public String getMessage() {
+        return "Missing required element " + ((namespace != null) ? namespace + ":" : "") + elementName + " in context " + getContext();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/ServiceUnavailableException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/ServiceUnavailableException.java
new file mode 100644
index 00000000..88d5389b
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/ServiceUnavailableException.java
@@ -0,0 +1,17 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public class ServiceUnavailableException extends IqPacketErrorException {
+    public ServiceUnavailableException(Element context, String errorMessage) {
+        super(context, errorMessage);
+    }
+
+    @Override
+    public String getMessage() {
+        return "Service unavailable: " + super.getMessage();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/UndefinedConditionException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/UndefinedConditionException.java
new file mode 100644
index 00000000..de821873
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/UndefinedConditionException.java
@@ -0,0 +1,17 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public class UndefinedConditionException extends IqPacketErrorException {
+    public UndefinedConditionException(Element packet, String errorText) {
+        super(packet, errorText);
+    }
+
+    @Override
+    public String getMessage() {
+        return "Undefined Condition: " + super.getMessage();
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/UnexpectedIqPacketTypeException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/UnexpectedIqPacketTypeException.java
new file mode 100644
index 00000000..82f229e8
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/UnexpectedIqPacketTypeException.java
@@ -0,0 +1,25 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import java.util.Arrays;
+
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public class UnexpectedIqPacketTypeException extends XmppException {
+    private final IqPacket.TYPE current;
+    private final IqPacket.TYPE[] expected;
+
+    public UnexpectedIqPacketTypeException(Element context, IqPacket.TYPE current, IqPacket.TYPE... expected) {
+        super(context);
+        this.expected = expected;
+        this.current = current;
+    }
+
+    @Override
+    public String getMessage() {
+        return "Unexpected IQ packet type '" + this.current + "' retrieved. One of " + Arrays.toString(expected) + " was expected.";
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/XmppException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/XmppException.java
new file mode 100644
index 00000000..b8c6c89d
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/XmppException.java
@@ -0,0 +1,56 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ *
+ */
+public class XmppException extends Exception {
+    private Element context;
+    /**
+     * Constructs a new {@code Exception} that includes the current stack trace.
+     */
+    public XmppException() {
+    }
+
+    /**
+     * Constructs a new {@code Exception} that includes the current stack trace.
+     */
+    public XmppException(Element context) {
+        this.context = context;
+    }
+
+    /**
+     * Constructs a new {@code Exception} with the current stack trace and the
+     * specified cause.
+     *
+     * @param throwable the cause of this exception.
+     */
+    public XmppException(Throwable throwable) {
+        super(throwable);
+    }
+
+    /**
+     * Constructs a new {@code Exception} with the current stack trace and the
+     * specified cause.
+     *
+     * @param throwable the cause of this exception.
+     */
+    public XmppException(Element context, Throwable throwable) {
+        super(throwable);
+        this.context = context;
+    }
+
+    @Override
+    public String getMessage() {
+        if (null != context) {
+            return "Error in XMPP Element. XML element is: " + this.context.toString();
+        } else {
+            return super.getMessage();
+        }
+    }
+
+    public Element getContext() {
+        return context;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/FileTransferHttp.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/FileTransferHttp.java
new file mode 100644
index 00000000..28f4f870
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/FileTransferHttp.java
@@ -0,0 +1,8 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http;
+
+/**
+ * Created by steckbrief on 21.08.2016.
+ */
+public interface FileTransferHttp {
+    String NAMESPACE = "urn:xmpp:filetransfer:http";
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/DeleteSlotPacketParser.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/DeleteSlotPacketParser.java
new file mode 100644
index 00000000..a6408e9f
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/DeleteSlotPacketParser.java
@@ -0,0 +1,30 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.delete;
+
+import de.thedevstack.conversationsplus.xmpp.IqPacketParser;
+import de.thedevstack.conversationsplus.xmpp.exceptions.UnexpectedIqPacketTypeException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.XmppException;
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.FileTransferHttp;
+import de.thedevstack.conversationsplus.xmpp.utils.ErrorIqPacketExceptionHelper;
+
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ * Created by steckbrief on 21.08.2016.
+ */
+public class DeleteSlotPacketParser extends IqPacketParser {
+    public static String parseDeleteToken(IqPacket packet) throws XmppException {
+        String deletetoken = null;
+        if (packet.getType() == IqPacket.TYPE.RESULT) {
+            Element slot = findRequiredChild(packet, "slot", FileTransferHttp.NAMESPACE);
+
+            deletetoken = findRequiredChildContent(slot, "deletetoken");
+        } else if (packet.getType() == IqPacket.TYPE.ERROR) {
+            ErrorIqPacketExceptionHelper.throwIqErrorException(packet);
+        } else {
+            throw new UnexpectedIqPacketTypeException(packet, packet.getType(), IqPacket.TYPE.RESULT, IqPacket.TYPE.ERROR);
+        }
+
+        return deletetoken;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/DeleteSlotRequestPacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/DeleteSlotRequestPacket.java
new file mode 100644
index 00000000..67deeb6f
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/DeleteSlotRequestPacket.java
@@ -0,0 +1,35 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.delete;
+
+import de.thedevstack.conversationsplus.xmpp.filetransfer.http.FileTransferHttp;
+
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ * Created by steckbrief on 21.08.2016.
+ */
+public class DeleteSlotRequestPacket extends IqPacket {
+    public static final String ELEMENT_NAME = "request";
+    public static final String FILEURL_ELEMENT_NAME = "fileurl";
+    private Element requestElement;
+    private String fileurl;
+
+    private DeleteSlotRequestPacket() {
+        super(TYPE.GET);
+        this.requestElement = super.addChild(DeleteSlotRequestPacket.ELEMENT_NAME, FileTransferHttp.NAMESPACE);
+        this.requestElement.setAttribute("type", "delete");
+    }
+
+    public DeleteSlotRequestPacket(String fileurl) {
+        this();
+        this.setFileURL(fileurl);
+    }
+
+    public void setFileURL(String fileurl) {
+        if (null == fileurl || fileurl.isEmpty()) {
+            throw new IllegalArgumentException("fileurl must not be null or empty.");
+        }
+        this.fileurl = fileurl;
+        this.requestElement.addChild(FILEURL_ELEMENT_NAME).setContent(fileurl);
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/FileTransferHttpDeleteSlotRequestPacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/FileTransferHttpDeleteSlotRequestPacketGenerator.java
new file mode 100644
index 00000000..fa0f7a34
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/delete/FileTransferHttpDeleteSlotRequestPacketGenerator.java
@@ -0,0 +1,39 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.delete;
+
+import eu.siacs.conversations.xmpp.jid.Jid;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ * Created by steckbrief on 21.08.2016.
+ */
+public final class FileTransferHttpDeleteSlotRequestPacketGenerator {
+    /**
+     * Generates the IqPacket to request a slot to delete a file previously uploaded via http upload.
+     * The attributes from and id are not set in here - this is added while sending the packet.
+     * <pre>
+     * <iq from='romeo@montague.tld/garden'
+     *     id='step_01'
+     *     to='upload.montague.tld'
+     *     type='get'>
+     *   <request type='delete' xmlns='urn:xmpp:filetransfer:http'>
+     *     <fileurl>http://upload.montague.tld/files/1e56ee17-ee4c-4a9c-aedd-cb09cb3984a7/my_juliet.png</fileurl>
+     *   </request>
+     * </iq>
+     * </pre>
+     * @param host the jid of the host to request a slot from
+     * @param fileurl the URL of the file to be deleted
+     * @return the IqPacket
+     */
+    public static IqPacket generate(Jid host, String fileurl) {
+        DeleteSlotRequestPacket packet = new DeleteSlotRequestPacket(fileurl);
+        packet.setTo(host);
+        return packet;
+    }
+
+    /**
+     * Utility class - avoid instantiation
+     */
+    private FileTransferHttpDeleteSlotRequestPacketGenerator() {
+        // Helper class - avoid instantiation
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUpload.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUpload.java
new file mode 100644
index 00000000..3bcbd219
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUpload.java
@@ -0,0 +1,9 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload;
+
+/**
+ *
+ */
+public interface HttpUpload {
+    String NAMESPACE = "urn:xmpp:http:upload";
+    String DEFAULT_MIME_TYPE = "application/octet-stream";
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUploadRequestSlotPacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUploadRequestSlotPacketGenerator.java
new file mode 100644
index 00000000..915cf9a7
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUploadRequestSlotPacketGenerator.java
@@ -0,0 +1,46 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload;
+
+import eu.siacs.conversations.xmpp.jid.Jid;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ * Generates the IQ Packets for requesting a http upload slot
+ * as defined in XEP-0363.
+ * @see <a href="http://xmpp.org/extensions/xep-0363.html">http://xmpp.org/extensions/xep-0363.html</a>
+ */
+public final class HttpUploadRequestSlotPacketGenerator {
+    /**
+     * Generates the IqPacket to request a http upload slot.
+     * The attributes from and id are not set in here - this is added while sending the packet.
+     * <pre>
+     * <iq from='romeo@montague.tld/garden'
+     *     id='step_03'
+     *     to='upload.montague.tld'
+     *     type='get'>
+     *   <request xmlns='urn:xmpp:http:upload'>
+     *     <filename>my_juliet.png</filename>
+     *     <size>23456</size>
+     *     <content-type>image/jpeg</content-type>
+     *   </request>
+     * </iq>
+     * </pre>
+     * @param host the jid of the host to request a slot from
+     * @param filename the filename of the file which will be transferred
+     * @param filesize the filesize of the file which will be transferred
+     * @param mime the mime type of the file which will be transferred - <code>optional</code> and therefore nullable
+     * @return the IqPacket
+     */
+    public static IqPacket generate(Jid host, String filename, long filesize, String mime) {
+        SlotRequestPacket packet = new SlotRequestPacket(filename, filesize);
+        packet.setTo(host);
+        packet.setMime((mime == null) ? HttpUpload.DEFAULT_MIME_TYPE : mime);
+        return packet;
+    }
+
+    /**
+     * Utility class - avoid instantiation
+     */
+    private HttpUploadRequestSlotPacketGenerator() {
+        // Helper class - avoid instantiation
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUploadSlot.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUploadSlot.java
new file mode 100644
index 00000000..1e320afe
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/HttpUploadSlot.java
@@ -0,0 +1,22 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload;
+
+/**
+ *
+ */
+public class HttpUploadSlot {
+    private final String getUrl;
+    private final String putUrl;
+
+    public HttpUploadSlot(String getUrl, String putUrl) {
+        this.getUrl = getUrl;
+        this.putUrl = putUrl;
+    }
+
+    public String getGetUrl() {
+        return this.getUrl;
+    }
+
+    public String getPutUrl() {
+        return this.putUrl;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/SlotPacketParser.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/SlotPacketParser.java
new file mode 100644
index 00000000..40e7db96
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/SlotPacketParser.java
@@ -0,0 +1,31 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload;
+
+import de.thedevstack.conversationsplus.xmpp.IqPacketParser;
+import de.thedevstack.conversationsplus.xmpp.exceptions.UnexpectedIqPacketTypeException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.XmppException;
+import de.thedevstack.conversationsplus.xmpp.utils.ErrorIqPacketExceptionHelper;
+
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public final class SlotPacketParser extends IqPacketParser {
+    public static HttpUploadSlot parseGetAndPutUrl(IqPacket packet) throws XmppException {
+        HttpUploadSlot httpUploadSlot = null;
+        if (packet.getType() == IqPacket.TYPE.RESULT) {
+            Element slot = findRequiredChild(packet, "slot", HttpUpload.NAMESPACE);
+
+            String getUrl = findRequiredChildContent(slot, "get");
+            String putUrl = findRequiredChildContent(slot, "put");
+
+            httpUploadSlot = new HttpUploadSlot(getUrl, putUrl);
+        } else if (packet.getType() == IqPacket.TYPE.ERROR) {
+            ErrorIqPacketExceptionHelper.throwIqErrorException(packet);
+        } else {
+            throw new UnexpectedIqPacketTypeException(packet, packet.getType(), IqPacket.TYPE.RESULT, IqPacket.TYPE.ERROR);
+        }
+        return httpUploadSlot;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/SlotRequestPacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/SlotRequestPacket.java
new file mode 100644
index 00000000..30c5db79
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/filetransfer/http/upload/SlotRequestPacket.java
@@ -0,0 +1,53 @@
+package de.thedevstack.conversationsplus.xmpp.filetransfer.http.upload;
+
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public class SlotRequestPacket extends IqPacket {
+    public static final String ELEMENT_NAME = "request";
+    public static final String FILENAME_ELEMENT_NAME = "filename";
+    public static final String FILESIZE_ELEMENT_NAME = "size";
+    public static final String MIME_ELEMENT_NAME = "content-type";
+    private Element requestElement;
+    private String filename;
+    private long filesize;
+    private String mime;
+
+    private SlotRequestPacket() {
+        super(TYPE.GET);
+        this.requestElement = super.addChild(SlotRequestPacket.ELEMENT_NAME, HttpUpload.NAMESPACE);
+    }
+
+    public SlotRequestPacket(String filename, long filesize) {
+        this();
+        this.setFilename(filename);
+        this.setFilesize(filesize);
+    }
+
+    public void setFilename(String filename) {
+        if (null == filename || filename.isEmpty()) {
+            throw new IllegalArgumentException("filename must not be null or empty.");
+        }
+        this.filename = filename;
+        this.requestElement.addChild(FILENAME_ELEMENT_NAME).setContent(filename);
+    }
+
+    public void setFilesize(long filesize) {
+        if (0 >= filesize) {
+            throw new IllegalArgumentException("filesize must not be null or empty.");
+        }
+        this.filesize = filesize;
+        this.requestElement.addChild(FILESIZE_ELEMENT_NAME).setContent(String.valueOf(filesize));
+    }
+
+    public void setMime(String mime) {
+        if (null == mime || mime.isEmpty()) {
+            throw new IllegalArgumentException("mime type must not be null or empty.");
+        }
+        this.mime = mime;
+        this.requestElement.addChild(MIME_ELEMENT_NAME).setContent(mime);
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/httpuploadim/HttpUploadHint.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpuploadim/HttpUploadHint.java
index 7868a2f5..00bd1158 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/httpuploadim/HttpUploadHint.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpuploadim/HttpUploadHint.java
@@ -3,10 +3,20 @@ package de.thedevstack.conversationsplus.xmpp.httpuploadim;
 import eu.siacs.conversations.xml.Element;
 
 /**
- * Created by steckbrief on 17.04.2016.
+ * Representation of the HttpUploadHint.
+ * <pre>
+ *  <httpupload xmlns="urn:xmpp:hints"/>
+ * </pre>
  */
 public class HttpUploadHint extends Element {
+    /**
+     * The namespace of message processing hints as defined in XEP-0334.
+     * @see <a href="http://xmpp.org/extensions/xep-0334.html">http://xmpp.org/extensions/xep-0334.html</a>
+     */
     public static final String NAMESPACE = "urn:xmpp:hints";
+    /**
+     * The element name of the hint for an http upload.
+     */
     public static final String ELEMENT_NAME = "httpupload";
 
     public HttpUploadHint() {
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacket.java
index 961277cb..31186191 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacket.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacket.java
@@ -4,28 +4,69 @@ import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
 /**
- * Created by tzur on 15.01.2016.
+ * Representation of a PubSub IQ packet as defined in XEP-0060.
+ * <br>One example:
+ * <pre>
+ *   <iq type='get'
+ *       from='romeo@montague.lit'
+ *       to='pubsub.shakespeare.lit'
+ *       id='items1'>
+ *      <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+ *          <items node='urn:xmpp:pubsub:subscription'/>
+ *      </pubsub>
+ *   </iq>
+ * </pre>
+ * @see <a href="http://xmpp.org/extensions/xep-0330.html">http://xmpp.org/extensions/xep-0060.html</a>
  */
 public class PubSubPacket extends IqPacket {
+    /**
+     * The namespace of pubsub.
+     */
     public static final String NAMESPACE = "http://jabber.org/protocol/pubsub";
+    /**
+     * The name of the root element.
+     */
     public static final String ELEMENT_NAME = "pubsub";
+    /**
+     * The PubSub element - everything which is added to this packet is a child of this element.
+     */
     private Element pubSubElement;
 
+    /**
+     * Instantiate the PubSubPacket for the given type.
+     * @param type the IqPacket.TYPE
+     */
     public PubSubPacket(IqPacket.TYPE type) {
         super(type);
         this.pubSubElement = super.addChild(PubSubPacket.ELEMENT_NAME, PubSubPacket.NAMESPACE);
     }
 
+    /**
+     * Adds an element to the PubSub element instead of the IqPacket.
+     * @param child the children to be added
+     * @return the added children
+     */
     @Override
     public Element addChild(Element child) {
         return this.pubSubElement.addChild(child);
     }
 
+    /**
+     * Adds an element to the PubSub element instead of the IqPacket.
+     * @param name name of the children to be added
+     * @return the added children
+     */
     @Override
     public Element addChild(String name) {
         return this.pubSubElement.addChild(name);
     }
 
+    /**
+     * Adds an element to the PubSub element instead of the IqPacket.
+     * @param name name of the children to be added
+     * @param xmlns namespace of the children to be added
+     * @return the added children
+     */
     @Override
     public Element addChild(String name, String xmlns) {
         return this.pubSubElement.addChild(name, xmlns);
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketGenerator.java
index 398ec032..f72bf777 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketGenerator.java
@@ -4,10 +4,32 @@ import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
 /**
- * Created by tzur on 15.01.2016.
+ * Generates the IQ packets for Pubsub Subscription as defined in XEP-0060.
+ * @see <a href="http://xmpp.org/extensions/xep-0060.html">http://xmpp.org/extensions/xep-0060.html</a>
  */
 public final class PubSubPacketGenerator {
 
+    /**
+     * Generates a pubsub publish packet.
+     * The attributes from and id are not set in here - this is added while sending the packet.
+     * <pre>
+     * <iq type='set'
+     *     from='hamlet@denmark.lit/blogbot'
+     *     to='pubsub.shakespeare.lit'
+     *     id='publish1'>
+     *   <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+     *     <publish node='princely_musings'>
+     *       <item id='bnd81g37d61f49fgn581'>
+     *         ...
+     *       </item>
+     *     </publish>
+     *   </pubsub>
+     * </iq>
+     * </pre>
+     * @param nodeName the name of the publish node
+     * @param item the item element
+     * @return the generated PubSubPacket
+     */
     public static PubSubPacket generatePubSubPublishPacket(String nodeName, Element item) {
         final PubSubPacket pubsub = new PubSubPacket(IqPacket.TYPE.SET);
         final Element publish = pubsub.addChild("publish");
@@ -16,6 +38,25 @@ public final class PubSubPacketGenerator {
         return pubsub;
     }
 
+    /**
+     * Generates a pubsub retrieve packet.
+     * The attributes from and id are not set in here - this is added while sending the packet.
+     * <pre>
+     * <iq type='get'
+     *     from='romeo@montague.lit/home'
+     *     to='juliet@capulet.lit'
+     *     id='retrieve1'>
+     *   <pubsub xmlns='http://jabber.org/protocol/pubsub'>
+     *     <items node='urn:xmpp:avatar:data'>
+     *       <item id='111f4b3c50d7b0df729d299bc6f8e9ef9066971f'/>
+     *     </items>
+     *   </pubsub>
+     * </iq>
+     * </pre>
+     * @param nodeName
+     * @param item
+     * @return
+     */
     public static PubSubPacket generatePubSubRetrievePacket(String nodeName, Element item) {
         final PubSubPacket pubsub = new PubSubPacket(IqPacket.TYPE.GET);
         final Element items = pubsub.addChild("items");
@@ -26,6 +67,9 @@ public final class PubSubPacketGenerator {
         return pubsub;
     }
 
+    /**
+     * Utility class - avoid instantiation
+     */
     private PubSubPacketGenerator() {
         // Avoid instantiation
     }
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketParser.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketParser.java
index 394fb5b2..c8df0d5e 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketParser.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/pubsub/PubSubPacketParser.java
@@ -4,16 +4,28 @@ import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
 /**
- * Created by tzur on 15.01.2016.
+ * Parses the IQ Packets for handling pubsub
+ * as defined in XEP-0060.
+ * @see <a href="http://xmpp.org/extensions/xep-0060.html">http://xmpp.org/extensions/xep-0060.html</a>
  */
-public class PubSubPacketParser {
+public final class PubSubPacketParser {
+    /**
+     * Finds the pubsub element within an IQ packet.
+     * @param packet the retrieved IQ packet
+     * @return the {@value PubSubPacket#ELEMENT_NAME} Element or <code>null</code> if the IqPacket is null or the IQ packet does not contain an pubsub element.
+     */
     public static Element findPubSubPacket(IqPacket packet){
         if (null == packet) {
             return null;
         }
-        return packet.findChild("pubsub", "http://jabber.org/protocol/pubsub");
+        return packet.findChild(PubSubPacket.ELEMENT_NAME, PubSubPacket.NAMESPACE);
     }
 
+    /**
+     * Finds the "items" element within an pubSubPacket element.
+     * @param pubSubPacket the pubSubPacket element
+     * @return the  items Element or <code>null</code> if the pubSubPacket is null or the pubSubPacket does not contain an items element.
+     */
     public static Element findItemsFromPubSubElement(Element pubSubPacket) {
         if (null == pubSubPacket) {
             return null;
@@ -21,7 +33,19 @@ public class PubSubPacketParser {
         return pubSubPacket.findChild("items");
     }
 
+    /**
+     * Finds the "items" element within an pubSubPacket element.
+     * @param packet the IqPacket element
+     * @return the  items Element or <code>null</code> if the IqPacket is null or the IQ packet does not contain an pubsub element with an items element.
+     */
     public static Element findItems(IqPacket packet) {
         return PubSubPacketParser.findItemsFromPubSubElement(PubSubPacketParser.findPubSubPacket(packet));
     }
+
+    /**
+     * Utility class - avoid instantiation
+     */
+    private PubSubPacketParser() {
+        // Avoid instantiation
+    }
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/utils/ErrorIqPacketExceptionHelper.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/utils/ErrorIqPacketExceptionHelper.java
new file mode 100644
index 00000000..15771248
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/utils/ErrorIqPacketExceptionHelper.java
@@ -0,0 +1,45 @@
+package de.thedevstack.conversationsplus.xmpp.utils;
+
+import de.thedevstack.conversationsplus.xmpp.IqPacketParser;
+import de.thedevstack.conversationsplus.xmpp.exceptions.BadRequestIqErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.InternalServerErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.IqPacketErrorException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.ServiceUnavailableException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.UndefinedConditionException;
+
+import eu.siacs.conversations.xml.Element;
+
+/**
+ * Created by steckbrief on 22.08.2016.
+ */
+public final class ErrorIqPacketExceptionHelper {
+    private final static String ERROR_NAMESPACE = "urn:ietf:params:xml:ns:xmpp-stanzas";
+
+    public static void throwIqErrorException(Element packet) throws IqPacketErrorException {
+        if (hasErrorElement(packet, "bad-request")) {
+            throw new BadRequestIqErrorException(packet, getErrorText(packet));
+        }
+        if (hasErrorElement(packet, "service-unavailable")) {
+            throw new ServiceUnavailableException(packet, getErrorText(packet));
+        }
+        if (hasErrorElement(packet, "internal-server-error")) {
+            throw new InternalServerErrorException(packet, getErrorText(packet));
+        }
+        if (hasErrorElement(packet, "undefined-condition")) {
+            throw new UndefinedConditionException(packet, getErrorText(packet));
+        }
+        throw new IqPacketErrorException(packet, "Unknown error packet.");
+    }
+
+    private static boolean hasErrorElement(Element packet, String elementName) {
+        return null != IqPacketParser.findChild(packet, elementName, ERROR_NAMESPACE);
+    }
+
+    private static String getErrorText(Element packet) {
+        return IqPacketParser.findChildContent(packet, "text", ERROR_NAMESPACE);
+    }
+
+    private ErrorIqPacketExceptionHelper() {
+
+    }
+}