FileTransfer reworked (first steps - functionality as is), HttpUpload

separated, some bugfixes
- HttpUpload moved into own package
- FileTransfer managed by a central manager class, several
  FileTransferService implementation can be used
  - Security initializations moved to ConversationsPlusApplication
  - Access to PowerManager moved to ConversationsPlusApplication
  - Removed unused code fragments
  - Access to HttpConnectionManager is now static

39 files changed, 1165 insertions, 199 deletions

diff --git a/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java b/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java
index a9f0c6ad..26854205 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ConversationsPlusApplication.java
@@ -3,12 +3,20 @@ 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.HttpConnectionManager;
 import de.thedevstack.conversationsplus.persistance.FileBackend;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferManager;
+import de.thedevstack.conversationsplus.services.filetransfer.httpupload.HttpUploadFileTransferService;
+import de.thedevstack.conversationsplus.services.filetransfer.jingle.JingleFileTransferService;
 import de.thedevstack.conversationsplus.utils.ImageUtil;
+import de.thedevstack.conversationsplus.utils.PRNGFixes;
 import de.thedevstack.conversationsplus.utils.SerialSingleThreadExecutor;
 
 /**
@@ -23,6 +31,9 @@ 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.
      */
@@ -30,8 +41,20 @@ 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();
+    }
+
+    /**
+     * Initializes security features.
+     */
+    private void initializeSecurity() {
+        PRNGFixes.apply();
+        this.secureRandom = new SecureRandom();
+        ConversationsPlusApplication.updateMemorizingTrustmanager();
     }
 
     /**
@@ -100,4 +123,31 @@ 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);
+    }
+
+    public static SecureRandom getSecureRandom() {
+        return getInstance().secureRandom;
+    }
 }
diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/PgpEngine.java b/src/main/java/de/thedevstack/conversationsplus/crypto/PgpEngine.java
index bba52954..d0b30d6d 100644
--- a/src/main/java/de/thedevstack/conversationsplus/crypto/PgpEngine.java
+++ b/src/main/java/de/thedevstack/conversationsplus/crypto/PgpEngine.java
@@ -65,12 +65,11 @@ public class PgpEngine {
 									&& message.getUuid().equals(uuid)) {
 								message.setBody(os.toString());
 								message.setEncryption(Message.ENCRYPTION_DECRYPTED);
-								final HttpConnectionManager manager = mXmppConnectionService.getHttpConnectionManager();
 								if (message.trusted()
 										&& message.treatAsDownloadable() != Message.Decision.NEVER
                                         && (message.isHttpUploaded() || ConversationsPlusPreferences.autoDownloadFileLink())
 										&& ConversationsPlusPreferences.autoAcceptFileSize() > 0) {
-									manager.createNewDownloadConnection(message);
+									HttpConnectionManager.createNewDownloadConnection(message);
 								}
 								mXmppConnectionService.updateMessage(message);
 								callback.success(message);
diff --git a/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java b/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java
index 4bc27a7d..5e302011 100644
--- a/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java
+++ b/src/main/java/de/thedevstack/conversationsplus/crypto/axolotl/AxolotlServiceImpl.java
@@ -34,6 +34,7 @@ import java.util.Random;
 import java.util.Set;
 
 import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.entities.Account;
 import de.thedevstack.conversationsplus.entities.Contact;
 import de.thedevstack.conversationsplus.entities.Conversation;
@@ -462,7 +463,7 @@ public class AxolotlServiceImpl implements OnAdvancedStreamFeaturesLoaded, Axolo
 			PrivateKey x509PrivateKey = KeyChain.getPrivateKey(mXmppConnectionService, account.getPrivateKeyAlias());
 			X509Certificate[] chain = KeyChain.getCertificateChain(mXmppConnectionService, account.getPrivateKeyAlias());
 			Signature verifier = Signature.getInstance("sha256WithRSA");
-			verifier.initSign(x509PrivateKey,mXmppConnectionService.getRNG());
+			verifier.initSign(x509PrivateKey, ConversationsPlusApplication.getSecureRandom());
 			verifier.update(axolotlPublicKey.serialize());
 			byte[] signature = verifier.sign();
 			IqPacket packet = mXmppConnectionService.getIqGenerator().publishVerification(signature, chain, getOwnDeviceId());
@@ -669,7 +670,7 @@ public class AxolotlServiceImpl implements OnAdvancedStreamFeaturesLoaded, Axolo
 							verifier.update(identityKey.serialize());
 							if (verifier.verify(verification.second)) {
 								try {
-									mXmppConnectionService.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(verification.first, "RSA");
+									ConversationsPlusApplication.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(verification.first, "RSA");
 									String fingerprint = session.getFingerprint();
 									Log.d(Config.LOGTAG, "verified session with x.509 signature. fingerprint was: "+fingerprint);
 									setFingerprintTrust(fingerprint, XmppAxolotlSession.Trust.TRUSTED_X509);
diff --git a/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java b/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java
index 9df0cc21..2d4c8f6a 100644
--- a/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java
+++ b/src/main/java/de/thedevstack/conversationsplus/generator/IqGenerator.java
@@ -20,7 +20,6 @@ import de.thedevstack.conversationsplus.Config;
 import de.thedevstack.conversationsplus.crypto.axolotl.AxolotlService;
 import de.thedevstack.conversationsplus.entities.Account;
 import de.thedevstack.conversationsplus.entities.Conversation;
-import de.thedevstack.conversationsplus.entities.DownloadableFile;
 import de.thedevstack.conversationsplus.services.MessageArchiveService;
 import de.thedevstack.conversationsplus.utils.Xmlns;
 import de.thedevstack.conversationsplus.xml.Element;
@@ -244,18 +243,6 @@ public class IqGenerator extends AbstractGenerator {
 		return packet;
 	}
 
-	public IqPacket requestHttpUploadSlot(Jid host, DownloadableFile file, String mime) {
-		IqPacket packet = new IqPacket(IqPacket.TYPE.GET);
-		packet.setTo(host);
-		Element request = packet.addChild("request", Xmlns.HTTP_UPLOAD);
-		request.addChild("filename").setContent(file.getName());
-		request.addChild("size").setContent(String.valueOf(file.getExpectedSize()));
-		if (mime != null) {
-			request.addChild("content-type").setContent(mime);
-		}
-		return packet;
-	}
-
 	public IqPacket generateCreateAccountWithCaptcha(Account account, String id, Data data) {
 		final IqPacket register = new IqPacket(IqPacket.TYPE.SET);
 
diff --git a/src/main/java/de/thedevstack/conversationsplus/http/HttpConnectionManager.java b/src/main/java/de/thedevstack/conversationsplus/http/HttpConnectionManager.java
index 59c54662..529d12c4 100644
--- a/src/main/java/de/thedevstack/conversationsplus/http/HttpConnectionManager.java
+++ b/src/main/java/de/thedevstack/conversationsplus/http/HttpConnectionManager.java
@@ -17,6 +17,7 @@ import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLSocketFactory;
 import javax.net.ssl.X509TrustManager;
 
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.entities.Message;
 import de.thedevstack.conversationsplus.services.AbstractConnectionManager;
 import de.thedevstack.conversationsplus.services.XmppConnectionService;
@@ -24,29 +25,23 @@ import de.thedevstack.conversationsplus.utils.CryptoHelper;
 import de.thedevstack.conversationsplus.utils.SSLSocketHelper;
 
 public class HttpConnectionManager extends AbstractConnectionManager {
+	private static HttpConnectionManager INSTANCE;
 
-	public HttpConnectionManager(XmppConnectionService service) {
-		super(service);
-	}
+    public static void init() {
+        INSTANCE = new HttpConnectionManager();
+    }
 
 	private List<HttpDownloadConnection> downloadConnections = new CopyOnWriteArrayList<>();
 	private List<HttpUploadConnection> uploadConnections = new CopyOnWriteArrayList<>();
 
-	public HttpDownloadConnection createNewDownloadConnection(Message message) {
-		return this.createNewDownloadConnection(message, false);
+	public static HttpDownloadConnection createNewDownloadConnection(Message message) {
+		return createNewDownloadConnection(message, false);
 	}
 
-	public HttpDownloadConnection createNewDownloadConnection(Message message, boolean interactive) {
-		HttpDownloadConnection connection = new HttpDownloadConnection(this);
+	public static HttpDownloadConnection createNewDownloadConnection(Message message, boolean interactive) {
+		HttpDownloadConnection connection = new HttpDownloadConnection(INSTANCE);
 		connection.init(message,interactive);
-		this.downloadConnections.add(connection);
-		return connection;
-	}
-
-	public HttpUploadConnection createNewUploadConnection(Message message, boolean delay) {
-		HttpUploadConnection connection = new HttpUploadConnection(this);
-		connection.init(message,delay);
-		this.uploadConnections.add(connection);
+		INSTANCE.downloadConnections.add(connection);
 		return connection;
 	}
 
@@ -58,26 +53,24 @@ public class HttpConnectionManager extends AbstractConnectionManager {
 		this.uploadConnections.remove(httpUploadConnection);
 	}
 
-	public void setupTrustManager(final HttpsURLConnection connection, final boolean interactive) {
+	public static void setupTrustManager(final HttpsURLConnection connection, final boolean interactive) {
 		final X509TrustManager trustManager;
 		final HostnameVerifier hostnameVerifier;
 		if (interactive) {
-			trustManager = mXmppConnectionService.getMemorizingTrustManager();
-			hostnameVerifier = mXmppConnectionService
-					.getMemorizingTrustManager().wrapHostnameVerifier(
+			trustManager = ConversationsPlusApplication.getMemorizingTrustManager();
+			hostnameVerifier = ConversationsPlusApplication.getMemorizingTrustManager().wrapHostnameVerifier(
 							new StrictHostnameVerifier());
 		} else {
-			trustManager = mXmppConnectionService.getMemorizingTrustManager()
+			trustManager = ConversationsPlusApplication.getMemorizingTrustManager()
 					.getNonInteractive();
-			hostnameVerifier = mXmppConnectionService
-					.getMemorizingTrustManager()
+			hostnameVerifier = ConversationsPlusApplication.getMemorizingTrustManager()
 					.wrapHostnameVerifierNonInteractive(
 							new StrictHostnameVerifier());
 		}
 		try {
 			final SSLContext sc = SSLSocketHelper.getSSLContext();
 			sc.init(null, new X509TrustManager[]{trustManager},
-					mXmppConnectionService.getRNG());
+					ConversationsPlusApplication.getSecureRandom());
 
 			final SSLSocketFactory sf = sc.getSocketFactory();
 			final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
diff --git a/src/main/java/de/thedevstack/conversationsplus/http/HttpDownloadConnection.java b/src/main/java/de/thedevstack/conversationsplus/http/HttpDownloadConnection.java
index 424dc96a..3facc14a 100644
--- a/src/main/java/de/thedevstack/conversationsplus/http/HttpDownloadConnection.java
+++ b/src/main/java/de/thedevstack/conversationsplus/http/HttpDownloadConnection.java
@@ -32,6 +32,7 @@ import de.thedevstack.conversationsplus.services.AbstractConnectionManager;
 import de.thedevstack.conversationsplus.services.XmppConnectionService;
 import de.thedevstack.conversationsplus.utils.CryptoHelper;
 import de.thedevstack.conversationsplus.utils.FileUtils;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
 
 public class HttpDownloadConnection implements Transferable {
 
@@ -48,7 +49,7 @@ public class HttpDownloadConnection implements Transferable {
 
 	public HttpDownloadConnection(HttpConnectionManager manager) {
 		this.mHttpConnectionManager = manager;
-		this.mXmppConnectionService = manager.getXmppConnectionService();
+		this.mXmppConnectionService = XmppConnectionServiceAccessor.xmppConnectionService;
 	}
 
 	@Override
@@ -265,7 +266,7 @@ public class HttpDownloadConnection implements Transferable {
 
 		private void download() throws SSLHandshakeException, IOException {
             InputStream is = null;
-            PowerManager.WakeLock wakeLock = mHttpConnectionManager.createWakeLock("http_download_"+message.getUuid());
+            PowerManager.WakeLock wakeLock = ConversationsPlusApplication.createPartialWakeLock("http_download_"+message.getUuid());
             try {
                 wakeLock.acquire();
                 HttpURLConnection connection = (HttpURLConnection) mUrl.openConnection();
diff --git a/src/main/java/de/thedevstack/conversationsplus/http/HttpUploadConnection.java b/src/main/java/de/thedevstack/conversationsplus/http/HttpUploadConnection.java
index 231a6ca7..7c791e70 100644
--- a/src/main/java/de/thedevstack/conversationsplus/http/HttpUploadConnection.java
+++ b/src/main/java/de/thedevstack/conversationsplus/http/HttpUploadConnection.java
@@ -30,11 +30,21 @@ import de.thedevstack.conversationsplus.services.XmppConnectionService;
 import de.thedevstack.conversationsplus.ui.UiCallback;
 import de.thedevstack.conversationsplus.utils.CryptoHelper;
 import de.thedevstack.conversationsplus.utils.Xmlns;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
 import de.thedevstack.conversationsplus.xml.Element;
 import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
+import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredContentException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredElementException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.XmppException;
+import de.thedevstack.conversationsplus.xmpp.httpupload.HttpUpload;
+import de.thedevstack.conversationsplus.xmpp.httpupload.HttpUploadRequestSlotPacketGenerator;
+import de.thedevstack.conversationsplus.xmpp.httpupload.HttpUploadSlot;
+import de.thedevstack.conversationsplus.xmpp.httpupload.SlotPacketParser;
+import de.thedevstack.conversationsplus.xmpp.httpupload.SlotRequestPacket;
 import de.thedevstack.conversationsplus.xmpp.jid.Jid;
 import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
 
+@Deprecated
 public class HttpUploadConnection implements Transferable {
 
 	private HttpConnectionManager mHttpConnectionManager;
@@ -57,7 +67,7 @@ public class HttpUploadConnection implements Transferable {
 
 	public HttpUploadConnection(HttpConnectionManager httpConnectionManager) {
 		this.mHttpConnectionManager = httpConnectionManager;
-		this.mXmppConnectionService = httpConnectionManager.getXmppConnectionService();
+		this.mXmppConnectionService = XmppConnectionServiceAccessor.xmppConnectionService;
 	}
 
 	@Override
@@ -107,7 +117,7 @@ public class HttpUploadConnection implements Transferable {
 				|| message.getEncryption() == Message.ENCRYPTION_AXOLOTL
 				|| message.getEncryption() == Message.ENCRYPTION_OTR) {
 			this.key = new byte[48];
-			mXmppConnectionService.getRNG().nextBytes(this.key);
+            ConversationsPlusApplication.getSecureRandom().nextBytes(this.key);
 			this.file.setKeyAndIv(this.key);
 		}
 		Pair<InputStream,Integer> pair;
@@ -119,29 +129,25 @@ public class HttpUploadConnection implements Transferable {
 		}
 		this.file.setExpectedSize(pair.second);
 		this.mFileInputStream = pair.first;
-		Jid host = account.getXmppConnection().findDiscoItemByFeature(Xmlns.HTTP_UPLOAD);
-		IqPacket request = mXmppConnectionService.getIqGenerator().requestHttpUploadSlot(host,file,mime);
+		Jid host = account.getXmppConnection().findDiscoItemByFeature(HttpUpload.NAMESPACE);
+        IqPacket request = HttpUploadRequestSlotPacketGenerator.generate(host, file.getName(), file.getSize(), mime);
 		mXmppConnectionService.sendIqPacket(account, request, new OnIqPacketReceived() {
 			@Override
 			public void onIqPacketReceived(Account account, IqPacket packet) {
-				if (packet.getType() == IqPacket.TYPE.RESULT) {
-					Element slot = packet.findChild("slot",Xmlns.HTTP_UPLOAD);
-					if (slot != null) {
-						try {
-							mGetUrl = new URL(slot.findChildContent("get"));
-							mPutUrl = new URL(slot.findChildContent("put"));
-							if (!canceled) {
-								new Thread(new FileUploader()).start();
-							}
-						} catch (MalformedURLException e) {
-							fail();
-						}
-					} else {
-						fail();
-					}
-				} else {
-					fail();
-				}
+                try {
+                    HttpUploadSlot slot = SlotPacketParser.parseGetAndPutUrl(packet);
+                    mGetUrl = new URL(slot.getGetUrl());
+                    mPutUrl = new URL(slot.getPutUrl());
+                    if (!canceled) {
+                        new Thread(new FileUploader()).start();
+                    }
+                } catch (XmppException e) {
+                    Logging.e("httpupload", e.getMessage());
+                    fail();
+                } catch (MalformedURLException e) {
+                    Logging.e("httpupload", "malformed url retrieved from slot", e);
+                    fail();
+                }
 			}
 		});
 		message.setTransferable(this);
@@ -159,7 +165,7 @@ public class HttpUploadConnection implements Transferable {
 			OutputStream os = null;
             InputStream errorStream = null;
 			HttpURLConnection connection = null;
-			PowerManager.WakeLock wakeLock = mHttpConnectionManager.createWakeLock("http_upload_"+message.getUuid());
+			PowerManager.WakeLock wakeLock = ConversationsPlusApplication.createPartialWakeLock("http_upload_"+message.getUuid());
 			try {
 				wakeLock.acquire();
 				Logging.d(Config.LOGTAG, "uploading to " + mPutUrl.toString());
diff --git a/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java b/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java
index a8e5929b..2f1701df 100644
--- a/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java
+++ b/src/main/java/de/thedevstack/conversationsplus/parser/MessageParser.java
@@ -472,7 +472,7 @@ public class MessageParser extends AbstractParser implements
                     && message.treatAsDownloadable() != Message.Decision.NEVER
                     && ConversationsPlusPreferences.autoAcceptFileSize() > 0
                     && (message.isHttpUploaded() || ConversationsPlusPreferences.autoDownloadFileLink())) {
-				this.mXmppConnectionService.getHttpConnectionManager().createNewDownloadConnection(message);
+				HttpConnectionManager.createNewDownloadConnection(message);
 			} else {
 				if (query == null) {
 					mXmppConnectionService.getNotificationService().push(message);
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/AbstractConnectionManager.java b/src/main/java/de/thedevstack/conversationsplus/services/AbstractConnectionManager.java
index 7c937475..5456430a 100644
--- a/src/main/java/de/thedevstack/conversationsplus/services/AbstractConnectionManager.java
+++ b/src/main/java/de/thedevstack/conversationsplus/services/AbstractConnectionManager.java
@@ -31,22 +31,14 @@ import javax.crypto.spec.IvParameterSpec;
 import javax.crypto.spec.SecretKeySpec;
 
 import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.entities.DownloadableFile;
 
 public class AbstractConnectionManager {
-	protected XmppConnectionService mXmppConnectionService;
-
-	public AbstractConnectionManager(XmppConnectionService service) {
-		this.mXmppConnectionService = service;
-	}
-
-	public XmppConnectionService getXmppConnectionService() {
-		return this.mXmppConnectionService;
-	}
 
 	public boolean hasStoragePermission() {
 		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
-			return mXmppConnectionService.checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
+			return ConversationsPlusApplication.getAppContext().checkSelfPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED;
 		} else {
 			return true;
 		}
@@ -125,9 +117,4 @@ public class AbstractConnectionManager {
 			return null;
 		}
 	}
-
-	public PowerManager.WakeLock createWakeLock(String name) {
-		PowerManager powerManager = (PowerManager) mXmppConnectionService.getSystemService(Context.POWER_SERVICE);
-		return powerManager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,name);
-	}
 }
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..d6ce4769
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/FileTransferService.java
@@ -0,0 +1,31 @@
+package de.thedevstack.conversationsplus.services;
+
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.entities.Transferable;
+
+/**
+ *
+ */
+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);
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/MessageArchiveService.java b/src/main/java/de/thedevstack/conversationsplus/services/MessageArchiveService.java
index cd55b42f..6402f4ed 100644
--- a/src/main/java/de/thedevstack/conversationsplus/services/MessageArchiveService.java
+++ b/src/main/java/de/thedevstack/conversationsplus/services/MessageArchiveService.java
@@ -10,6 +10,7 @@ import java.util.List;
 
 import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.R;
 import de.thedevstack.conversationsplus.entities.Account;
 import de.thedevstack.conversationsplus.entities.Conversation;
@@ -290,7 +291,7 @@ public class MessageArchiveService implements OnAdvancedStreamFeaturesLoaded {
 			this.account = account;
 			this.start = start;
 			this.end = end;
-			this.queryId = new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
+			this.queryId = new BigInteger(50, ConversationsPlusApplication.getSecureRandom()).toString(32);
 		}
 		
 		private Query page(String reference) {
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java b/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java
index 9c0e55db..83cefc80 100644
--- a/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java
+++ b/src/main/java/de/thedevstack/conversationsplus/services/XmppConnectionService.java
@@ -12,7 +12,6 @@ import android.graphics.Bitmap;
 import android.media.AudioManager;
 import android.net.ConnectivityManager;
 import android.net.NetworkInfo;
-import android.net.Uri;
 import android.os.Binder;
 import android.os.Build;
 import android.os.Bundle;
@@ -58,8 +57,7 @@ import de.duenndns.ssl.MemorizingTrustManager;
 import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
-import de.thedevstack.conversationsplus.exceptions.FileCopyException;
-import de.thedevstack.conversationsplus.utils.FileUtils;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferManager;
 import de.thedevstack.conversationsplus.utils.ImageUtil;
 import de.thedevstack.conversationsplus.utils.MessageUtil;
 import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
@@ -97,7 +95,6 @@ import de.thedevstack.conversationsplus.ui.UiCallback;
 import de.thedevstack.conversationsplus.utils.CryptoHelper;
 import de.thedevstack.conversationsplus.utils.ExceptionHelper;
 import de.thedevstack.conversationsplus.utils.OnPhoneContactsLoadedListener;
-import de.thedevstack.conversationsplus.utils.PRNGFixes;
 import de.thedevstack.conversationsplus.utils.PhoneHelper;
 import de.thedevstack.conversationsplus.utils.Xmlns;
 import de.thedevstack.conversationsplus.xml.Element;
@@ -148,7 +145,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			startService(intent);
 		}
 	};
-	private MemorizingTrustManager mMemorizingTrustManager;
 	private NotificationService mNotificationService = new NotificationService(
 			this);
 	private OnMessagePacketReceived mMessageParser = new MessageParser(this);
@@ -169,8 +165,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	private MessageGenerator mMessageGenerator = new MessageGenerator();
 	private PresenceGenerator mPresenceGenerator = new PresenceGenerator();
 	private List<Account> accounts;
-	private JingleConnectionManager mJingleConnectionManager = new JingleConnectionManager(
-			this);
+	private JingleConnectionManager mJingleConnectionManager = new JingleConnectionManager();
 	public OnContactStatusChanged onContactStatusChanged = new OnContactStatusChanged() {
 
 		@Override
@@ -197,8 +192,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			}
 		}
 	};
-	private HttpConnectionManager mHttpConnectionManager = new HttpConnectionManager(
-			this);
 	private MessageArchiveService mMessageArchiveService = new MessageArchiveService(this);
 	private PushManagementService mPushManagementService = new PushManagementService(this);
 	private OnConversationUpdate mOnConversationUpdate = null;
@@ -239,7 +232,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	private int mucRosterChangedListenerCount = 0;
 	private OnKeyStatusUpdated mOnKeyStatusUpdated = null;
 	private int keyStatusUpdatedListenerCount = 0;
-	private SecureRandom mRandom;
 	private LruCache<Pair<String,String>,ServiceDiscoveryResult> discoCache = new LruCache<>(20);
 	private final OnBindListener mOnBindListener = new OnBindListener() {
 
@@ -311,7 +303,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 						&& checkListeners();
 				Logging.d(Config.LOGTAG,account.getJid().toBareJid()+": push mode "+Boolean.toString(pushMode));
 				if (!disabled && !pushMode) {
-					int timeToReconnect = mRandom.nextInt(20) + 10;
+					int timeToReconnect = ConversationsPlusApplication.getSecureRandom().nextInt(20) + 10;
 					scheduleWakeUpCall(timeToReconnect, account.getUuid().hashCode());
 				}
 			} else if (account.getStatus() == Account.State.REGISTRATION_SUCCESSFUL) {
@@ -334,8 +326,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	private OpenPgpServiceConnection pgpServiceConnection;
 	private PgpEngine mPgpEngine = null;
 	private WakeLock wakeLock;
-	private PowerManager pm;
-	private LruCache<String, Bitmap> mBitmapCache;
 	private Thread mPhoneContactMergerThread;
 	private EventReceiver mEventReceiver = new EventReceiver();
 
@@ -577,17 +567,8 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	@Override
 	public void onCreate() {
 		ExceptionHelper.init(getApplicationContext());
-		PRNGFixes.apply();
-		this.mRandom = new SecureRandom();
-		updateMemorizingTrustmanager();
 		final int maxMemory = (int) (Runtime.getRuntime().maxMemory() / 1024);
 		final int cacheSize = maxMemory / 8;
-		this.mBitmapCache = new LruCache<String, Bitmap>(cacheSize) {
-			@Override
-			protected int sizeOf(final String key, final Bitmap bitmap) {
-				return bitmap.getByteCount() / 1024;
-			}
-		};
 
 		this.databaseBackend = DatabaseBackend.getInstance(getApplicationContext());
 		this.accounts = databaseBackend.getAccounts();
@@ -614,8 +595,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			this.pgpServiceConnection.bindToService();
 		}
 
-		this.pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
-		this.wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "XmppConnectionService");
+		this.wakeLock = ConversationsPlusApplication.createPartialWakeLock("XmppConnectionService");
 		toggleForegroundService();
 		updateUnreadCountBadge();
         UiUpdateHelper.initXmppConnectionService(this);
@@ -628,7 +608,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		super.onTrimMemory(level);
 		if (level >= TRIM_MEMORY_COMPLETE) {
 			Log.d(Config.LOGTAG, "clear cache due to low memory");
-			getBitmapCache().evictAll();
+			ImageUtil.evictBitmapCache();
 		}
 	}
 
@@ -739,16 +719,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
-	private void sendFileMessage(final Message message, final boolean delay) {
-		Logging.d(Config.LOGTAG, "send file message");
-		final Account account = message.getConversation().getAccount();
-		if (account.httpUploadAvailable(FileBackend.getFile(message,false).getSize())) {
-			mHttpConnectionManager.createNewUploadConnection(message, delay);
-		} else {
-			mJingleConnectionManager.createNewConnection(message);
-		}
-	}
-
 	public void sendMessage(final Message message) {
 		sendMessage(message, false, false);
 	}
@@ -776,28 +746,23 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 
 		if (account.isOnlineAndConnected()) {
+            FileTransferManager fileTransferManager = FileTransferManager.getInstance();
 			switch (message.getEncryption()) {
 				case Message.ENCRYPTION_NONE:
-					if (message.needsUploading()) {
-						if (account.httpUploadAvailable(FileBackend.getFile(message,false).getSize())
-								|| message.fixCounterpart()) {
-							this.sendFileMessage(message, delay);
-						} else {
-							break;
-						}
+					if (fileTransferManager.accept(message)) {
+                        if (!fileTransferManager.transferFile(message, delay)) {
+                            break;
+                        }
 					} else {
 						packet = mMessageGenerator.generateChat(message);
 					}
 					break;
 				case Message.ENCRYPTION_PGP:
 				case Message.ENCRYPTION_DECRYPTED:
-					if (message.needsUploading()) {
-						if (account.httpUploadAvailable(FileBackend.getFile(message,false).getSize())
-								|| message.fixCounterpart()) {
-							this.sendFileMessage(message, delay);
-						} else {
-							break;
-						}
+                    if (fileTransferManager.accept(message)) {
+                        if (!fileTransferManager.transferFile(message, delay)) {
+                            break;
+                        }
 					} else {
 						packet = mMessageGenerator.generatePgpChat(message);
 					}
@@ -810,7 +775,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 						} catch (InvalidJidException e) {
 							break;
 						}
-						if (message.needsUploading()) {
+						if (message.needsUploading()) { //TODO: Use FileTransferManager with a preselection of filetransfer method
 							mJingleConnectionManager.createNewConnection(message);
 						} else {
 							packet = mMessageGenerator.generateOtrChat(message);
@@ -828,13 +793,10 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 					break;
 				case Message.ENCRYPTION_AXOLOTL:
 					message.setFingerprint(account.getAxolotlService().getOwnFingerprint());
-					if (message.needsUploading()) {
-						if (account.httpUploadAvailable(FileBackend.getFile(message,false).getSize())
-								|| message.fixCounterpart()) {
-							this.sendFileMessage(message, delay);
-						} else {
-							break;
-						}
+                    if (fileTransferManager.accept(message)) {
+                        if (!fileTransferManager.transferFile(message, delay)) {
+                            break;
+                        }
 					} else {
 						XmppAxolotlMessage axolotlMessage = account.getAxolotlService().fetchAxolotlMessageFromCache(message);
 						if (axolotlMessage == null) {
@@ -1331,7 +1293,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 						callback.onAccountCreated(account);
 						if (Config.X509_VERIFICATION) {
 							try {
-								getMemorizingTrustManager().getNonInteractive().checkClientTrusted(chain, "RSA");
+								ConversationsPlusApplication.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(chain, "RSA");
 							} catch (CertificateException e) {
 								callback.informUser(R.string.certificate_chain_is_not_trusted);
 							}
@@ -1359,7 +1321,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 				databaseBackend.updateAccount(account);
 				if (Config.X509_VERIFICATION) {
 					try {
-						getMemorizingTrustManager().getNonInteractive().checkClientTrusted(chain, "RSA");
+                        ConversationsPlusApplication.getMemorizingTrustManager().getNonInteractive().checkClientTrusted(chain, "RSA");
 					} catch (CertificateException e) {
 						showErrorToastInUi(R.string.certificate_chain_is_not_trusted);
 					}
@@ -1901,7 +1863,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 					}
 					return;
 				}
-				String name = new BigInteger(75, getRNG()).toString(32);
+				String name = new BigInteger(75, ConversationsPlusApplication.getSecureRandom()).toString(32);
 				Jid jid = Jid.fromParts(name, server, null);
 				final Conversation conversation = findOrCreateConversation(account, jid, true);
 				joinMuc(conversation, new OnConferenceJoined() {
@@ -2170,7 +2132,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	public boolean renewSymmetricKey(Conversation conversation) {
 		Account account = conversation.getAccount();
 		byte[] symmetricKey = new byte[32];
-		this.mRandom.nextBytes(symmetricKey);
+		ConversationsPlusApplication.getSecureRandom().nextBytes(symmetricKey);
 		Session otrSession = conversation.getOtrSession();
 		if (otrSession != null) {
 			MessagePacket packet = new MessagePacket();
@@ -2440,36 +2402,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
-	public SecureRandom getRNG() {
-		return this.mRandom;
-	}
-
-	public MemorizingTrustManager getMemorizingTrustManager() {
-		return this.mMemorizingTrustManager;
-	}
-
-	public void setMemorizingTrustManager(MemorizingTrustManager trustManager) {
-		this.mMemorizingTrustManager = trustManager;
-	}
-
-	public void updateMemorizingTrustmanager() {
-		final MemorizingTrustManager tm;
-		if (ConversationsPlusPreferences.dontTrustSystemCAs()) {
-			 tm = new MemorizingTrustManager(getApplicationContext(), null);
-		} else {
-			tm = new MemorizingTrustManager(getApplicationContext());
-		}
-		setMemorizingTrustManager(tm);
-	}
-
-	public PowerManager getPowerManager() {
-		return this.pm;
-	}
-
-	public LruCache<String, Bitmap> getBitmapCache() {
-		return this.mBitmapCache;
-	}
-
 	public void syncRosterToDisk(final Account account) {
 		Runnable runnable = new Runnable() {
 
@@ -2599,10 +2531,6 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		return this.mNotificationService;
 	}
 
-	public HttpConnectionManager getHttpConnectionManager() {
-		return this.mHttpConnectionManager;
-	}
-
 	public void resendFailedMessages(final Message message) {
         if (message.getStatus() == Message.STATUS_SEND_FAILED) {
             message.setTime(System.currentTimeMillis());
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..02bd04b9
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/AbstractFileTransferService.java
@@ -0,0 +1,31 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.services.FileTransferService;
+
+/**
+ *
+ */
+public abstract class AbstractFileTransferService implements FileTransferService, FileTransferStatusListener {
+    protected List<Message> failedMessages = new ArrayList<>();
+
+    @Override
+    public void onFailure(Message message, boolean delay) {
+        this.failedMessages.add(message);
+    }
+
+    @Override
+    public void onSuccess(Message message, boolean delay) {
+        if (this.failedMessages.contains(message)) {
+            this.failedMessages.remove(message);
+        }
+    }
+
+    @Override
+    public boolean accept(Message message) {
+        return !this.failedMessages.contains(message);
+    }
+}
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..a44cf49d
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferEntity.java
@@ -0,0 +1,108 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+import java.io.InputStream;
+
+import de.thedevstack.conversationsplus.entities.DownloadableFile;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.entities.Transferable;
+import de.thedevstack.conversationsplus.persistance.FileBackend;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
+
+/**
+ *
+ */
+public class FileTransferEntity implements Transferable {
+    private final Message message;
+    private int tries = 0;
+    private boolean transferred = false;
+    private boolean canceled = false;
+    private boolean failed = false;
+    private long transmitted = 0;
+    private DownloadableFile file;
+    private InputStream fileInputStream;
+
+    public FileTransferEntity(Message message) {
+        this.message = message;
+        this.message.setTransferable(this);
+        this.file = FileBackend.getFile(message, false);
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        FileTransferEntity other = (FileTransferEntity)o;
+        if ((this.message == null && other.message != null)
+            || (this.message != null && other.message == null)) {
+            return false;
+        } else if (this.message == null && other.message == null) {
+            return true;
+        }
+        return this.message.getUuid().equals(other.message.getUuid());
+    }
+
+    @Override
+    public boolean start() {
+        return false;
+    }
+
+    @Override
+    public int getStatus() {
+        int status = (failed) ? STATUS_FAILED : STATUS_UPLOADING;
+        return status;
+    }
+
+    @Override
+    public long getFileSize() {
+        return file == null ? 0 : file.getExpectedSize();
+    }
+
+    @Override
+    public int getProgress() {
+        if (file == null) {
+            return 0;
+        }
+        return (int) ((((double) transmitted) / file.getExpectedSize()) * 100);
+    }
+
+    @Override
+    public void cancel() {
+        this.canceled = true;
+    }
+
+    public void fail() {
+        this.failed = true;
+        this.getMessage().setTransferable(null);
+        MessageUtil.markMessage(this.getMessage(), Message.STATUS_SEND_FAILED);
+    }
+
+    public Message getMessage() {
+        return message;
+    }
+
+    public boolean isCanceled() {
+        return this.canceled;
+    }
+
+    public boolean isFailed() {
+        return failed;
+    }
+
+    public void updateProgress(long progress) {
+        this.transmitted += progress;
+    }
+
+    public DownloadableFile getFile() {
+        return file;
+    }
+
+    public void transferred() {
+        this.transferred = true;
+    }
+
+    public void setFileInputStream(InputStream fileInputStream) {
+        this.fileInputStream = fileInputStream;
+    }
+
+    public InputStream getFileInputStream() {
+        return fileInputStream;
+    }
+}
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..f7b3f4e2
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferManager.java
@@ -0,0 +1,127 @@
+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.Config;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.services.FileTransferService;
+
+/**
+ *
+ */
+public class FileTransferManager implements FileTransferService {
+    private SortedSet<WeightedTransferService> transferServices;
+    private static final FileTransferManager INSTANCE = new FileTransferManager();
+
+    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) {
+        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
+     */
+    @Override
+    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 = wts.fileTransferService.transferFile(message, delay);
+                    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
+     */
+    @Override
+    public boolean accept(Message message) {
+        return message.needsUploading();
+    }
+
+    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/FileTransferStatusListener.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusListener.java
new file mode 100644
index 00000000..89af5b39
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/FileTransferStatusListener.java
@@ -0,0 +1,11 @@
+package de.thedevstack.conversationsplus.services.filetransfer;
+
+import de.thedevstack.conversationsplus.entities.Message;
+
+/**
+ *
+ */
+public interface FileTransferStatusListener {
+    void onFailure(Message message, boolean delay);
+    void onSuccess(Message message, boolean delay);
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpFileTransferEntity.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpFileTransferEntity.java
new file mode 100644
index 00000000..8efd498b
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpFileTransferEntity.java
@@ -0,0 +1,52 @@
+package de.thedevstack.conversationsplus.services.filetransfer.httpupload;
+
+import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.services.filetransfer.FileTransferEntity;
+import de.thedevstack.conversationsplus.xmpp.httpupload.HttpUploadSlot;
+
+/**
+ *
+ */
+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();
+        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;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpFileUploader.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpFileUploader.java
new file mode 100644
index 00000000..6352c7a7
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpFileUploader.java
@@ -0,0 +1,120 @@
+package de.thedevstack.conversationsplus.services.filetransfer.httpupload;
+
+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.util.Scanner;
+
+import javax.net.ssl.HttpsURLConnection;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.Config;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
+import de.thedevstack.conversationsplus.entities.DownloadableFile;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.http.HttpConnectionManager;
+import de.thedevstack.conversationsplus.persistance.FileBackend;
+import de.thedevstack.conversationsplus.utils.CryptoHelper;
+import de.thedevstack.conversationsplus.utils.MessageUtil;
+import de.thedevstack.conversationsplus.utils.StreamUtil;
+import de.thedevstack.conversationsplus.utils.UiUpdateHelper;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
+import de.thedevstack.conversationsplus.xmpp.httpupload.HttpUpload;
+
+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;
+        InputStream errorStream = 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(Config.LOGTAG, "uploading 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 = this.entity.getFile().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(Config.LOGTAG, "finished uploading file");
+                this.entity.transferred();
+                URL getUrl = new URL(this.entity.getGetUrl());
+                if (this.entity.getKey() != null) {
+                    getUrl = new URL(getUrl.toString() + "#" + CryptoHelper.bytesToHex(this.entity.getKey()));
+                }
+                Message message = this.entity.getMessage();
+                MessageUtil.updateFileParams(message, getUrl);
+                FileBackend.updateMediaScanner(file, XmppConnectionServiceAccessor.xmppConnectionService);
+                message.setTransferable(null);
+                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 {
+                errorStream = connection.getErrorStream();
+                Logging.e("httpupload", "file upload failed: http code (" + code + ") " + new Scanner(errorStream).useDelimiter("\\A").next());
+                this.entity.fail();
+            }
+        } catch (IOException e) {
+            errorStream = (null != connection) ? connection.getErrorStream() : null;
+            String httpResponseMessage = null;
+            if (null != errorStream) {
+                httpResponseMessage = new Scanner(errorStream).useDelimiter("\\A").next();
+            }
+            Logging.e("httpupload", ((null != httpResponseMessage) ? ("http response: " + httpResponseMessage + ", ") : "") + "exception message: " + e.getMessage());
+            this.entity.fail();
+        } finally {
+            StreamUtil.close(os);
+            StreamUtil.close(errorStream);
+            StreamUtil.close(fileInputStream);
+            if (connection != null) {
+                connection.disconnect();
+            }
+            wakeLock.release();
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadFileTransferService.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadFileTransferService.java
new file mode 100644
index 00000000..59957d1e
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadFileTransferService.java
@@ -0,0 +1,84 @@
+package de.thedevstack.conversationsplus.services.filetransfer.httpupload;
+
+import android.util.Pair;
+
+import java.io.FileNotFoundException;
+import java.io.InputStream;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.entities.DownloadableFile;
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.persistance.FileBackend;
+import de.thedevstack.conversationsplus.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.httpupload.HttpUpload;
+import de.thedevstack.conversationsplus.xmpp.httpupload.HttpUploadRequestSlotPacketGenerator;
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.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) {
+        boolean started = false;
+        try {
+            final HttpFileTransferEntity entity = new HttpFileTransferEntity(message, delay);
+            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);
+            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);
+            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()
+                && message.getConversation().getAccount().httpUploadAvailable(FileBackend.getFile(message, false).getSize());
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadSlotRequestReceived.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadSlotRequestReceived.java
new file mode 100644
index 00000000..e0b2332a
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadSlotRequestReceived.java
@@ -0,0 +1,34 @@
+package de.thedevstack.conversationsplus.services.filetransfer.httpupload;
+
+import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.entities.Account;
+import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
+import de.thedevstack.conversationsplus.xmpp.exceptions.XmppException;
+import de.thedevstack.conversationsplus.xmpp.httpupload.HttpUploadSlot;
+import de.thedevstack.conversationsplus.xmpp.httpupload.SlotPacketParser;
+import de.thedevstack.conversationsplus.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();
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadedFileEncryptionUiCallback.java b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadedFileEncryptionUiCallback.java
new file mode 100644
index 00000000..25a16d78
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/httpupload/HttpUploadedFileEncryptionUiCallback.java
@@ -0,0 +1,33 @@
+package de.thedevstack.conversationsplus.services.filetransfer.httpupload;
+
+import android.app.PendingIntent;
+
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.ui.UiCallback;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
+
+/**
+ *
+ */
+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();
+    }
+
+    @Override
+    public void userInputRequried(PendingIntent pi, Message object) {
+        this.entity.fail();
+    }
+}
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..46ee7ce5
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/services/filetransfer/jingle/JingleFileTransferService.java
@@ -0,0 +1,51 @@
+package de.thedevstack.conversationsplus.services.filetransfer.jingle;
+
+import de.thedevstack.conversationsplus.entities.Message;
+import de.thedevstack.conversationsplus.services.FileTransferService;
+import de.thedevstack.conversationsplus.xmpp.jingle.JingleConnection;
+import de.thedevstack.conversationsplus.xmpp.jingle.JingleConnectionManager;
+
+/**
+ *
+ */
+public class JingleFileTransferService 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/ConversationActivity.java b/src/main/java/de/thedevstack/conversationsplus/ui/ConversationActivity.java
index de69c1e6..99d26b64 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/ConversationActivity.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/ConversationActivity.java
@@ -45,6 +45,7 @@ import java.util.concurrent.atomic.AtomicBoolean;
 
 import de.thedevstack.android.logcat.Logging;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
+import de.thedevstack.conversationsplus.http.HttpConnectionManager;
 import de.thedevstack.conversationsplus.ui.dialogs.UserDecisionDialog;
 import de.thedevstack.conversationsplus.ui.listeners.ResizePictureUserDecisionListener;
 import de.thedevstack.conversationsplus.utils.ConversationUtil;
@@ -620,7 +621,7 @@ public class ConversationActivity extends XmppActivity
 				Toast.makeText(this, R.string.not_connected_try_again, Toast.LENGTH_SHORT).show();
 			}
 		} else if (message.treatAsDownloadable() != Message.Decision.NEVER) {
-			xmppConnectionService.getHttpConnectionManager().createNewDownloadConnection(message, true);
+			HttpConnectionManager.createNewDownloadConnection(message, true);
 		}
 	}
 
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/ConversationFragment.java b/src/main/java/de/thedevstack/conversationsplus/ui/ConversationFragment.java
index f065a25b..d6e6f34c 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/ConversationFragment.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/ConversationFragment.java
@@ -46,6 +46,7 @@ import java.util.Collections;
 import java.util.List;
 
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
+import de.thedevstack.conversationsplus.http.HttpConnectionManager;
 import de.thedevstack.conversationsplus.http.HttpDownloadConnection;
 import de.thedevstack.conversationsplus.ui.dialogs.MessageDetailsDialog;
 import de.thedevstack.conversationsplus.Config;
@@ -685,8 +686,7 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 	}
 
 	private void downloadFile(Message message) {
-		activity.xmppConnectionService.getHttpConnectionManager()
-				.createNewDownloadConnection(message,true);
+		HttpConnectionManager.createNewDownloadConnection(message,true);
 	}
 
 	private void cancelTransmission(Message message) {
diff --git a/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java b/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java
index 84eb7016..296f8f4f 100644
--- a/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java
+++ b/src/main/java/de/thedevstack/conversationsplus/ui/SettingsActivity.java
@@ -23,6 +23,7 @@ import java.util.List;
 import java.util.Locale;
 
 import de.duenndns.ssl.MemorizingTrustManager;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.services.ExportLogsService;
 import de.tzur.conversations.Settings;
 import de.thedevstack.conversationsplus.R;
@@ -71,7 +72,7 @@ public class SettingsActivity extends XmppActivity implements
 		removeCertsPreference.setOnPreferenceClickListener(new Preference.OnPreferenceClickListener() {
 			@Override
 			public boolean onPreferenceClick(Preference preference) {
-				final MemorizingTrustManager mtm = xmppConnectionService.getMemorizingTrustManager();
+				final MemorizingTrustManager mtm = ConversationsPlusApplication.getMemorizingTrustManager();
 				final ArrayList<String> aliases = Collections.list(mtm.getCertificates());
 				if (aliases.size() == 0) {
 					displayToast(getString(R.string.toast_no_trusted_certs));
@@ -178,7 +179,7 @@ public class SettingsActivity extends XmppActivity implements
 				xmppConnectionService.refreshAllPresences();
 			}
 		} else if (name.equals("dont_trust_system_cas")) {
-			xmppConnectionService.updateMemorizingTrustmanager();
+			ConversationsPlusApplication.updateMemorizingTrustmanager();
 			reconnectAccounts();
 		} else if ("parse_emoticons".equals(name)) {
             EmojiconHandler.setParseEmoticons(Settings.PARSE_EMOTICONS);
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/AbstractIqPacketParser.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/AbstractIqPacketParser.java
new file mode 100644
index 00000000..d777cb64
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/AbstractIqPacketParser.java
@@ -0,0 +1,43 @@
+package de.thedevstack.conversationsplus.xmpp;
+
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredContentException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.MissingRequiredElementException;
+
+/**
+ *
+ */
+public abstract class AbstractIqPacketParser {
+    protected static Element findRequiredChild(Element element, String elementName, String namespace) throws MissingRequiredElementException {
+        if (null == element) {
+            return null;
+        }
+        Element child = element.findChild(elementName, namespace);
+        if (child == null) {
+            throw new MissingRequiredElementException(elementName, namespace, element);
+        }
+        return child;
+    }
+
+    protected 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;
+    }
+
+    protected static String findRequiredChildContent(Element element, String elementName, String namespace) throws MissingRequiredContentException {
+        if (null == element) {
+            return null;
+        }
+        String childContent = element.findChildContent(elementName, namespace);
+        if (null == childContent) {
+            throw new MissingRequiredContentException(elementName, namespace, element);
+        }
+        return childContent;
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
index a89f308f..c5a8fe3b 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/XmppConnection.java
@@ -2,7 +2,6 @@ package de.thedevstack.conversationsplus.xmpp;
 
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
-import android.os.PowerManager;
 import android.os.PowerManager.WakeLock;
 import android.os.SystemClock;
 import android.security.KeyChain;
@@ -50,6 +49,7 @@ import javax.net.ssl.X509TrustManager;
 
 import de.duenndns.ssl.MemorizingTrustManager;
 import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.ConversationsPlusPreferences;
 import de.thedevstack.conversationsplus.dto.SrvRecord;
 import de.thedevstack.conversationsplus.Config;
@@ -199,8 +199,7 @@ public class XmppConnection implements Runnable {
 
 	public XmppConnection(final Account account, final XmppConnectionService service) {
 		this.account = account;
-		this.wakeLock = service.getPowerManager().newWakeLock(
-				PowerManager.PARTIAL_WAKE_LOCK, account.getJid().toBareJid().toString());
+		this.wakeLock = ConversationsPlusApplication.createPartialWakeLock(account.getJid().toBareJid().toString());
 		tagWriter = new TagWriter();
 		mXmppConnectionService = service;
 	}
@@ -382,14 +381,14 @@ public class XmppConnection implements Runnable {
 
 	private TlsFactoryVerifier getTlsFactoryVerifier() throws NoSuchAlgorithmException, KeyManagementException, IOException {
 		final SSLContext sc = SSLSocketHelper.getSSLContext();
-		MemorizingTrustManager trustManager = this.mXmppConnectionService.getMemorizingTrustManager();
+		MemorizingTrustManager trustManager = ConversationsPlusApplication.getMemorizingTrustManager();
 		KeyManager[] keyManager;
 		if (account.getPrivateKeyAlias() != null && account.getPassword().isEmpty()) {
 			keyManager = new KeyManager[]{mKeyManager};
 		} else {
 			keyManager = null;
 		}
-		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager : trustManager.getNonInteractive()}, mXmppConnectionService.getRNG());
+		sc.init(keyManager, new X509TrustManager[]{mInteractive ? trustManager : trustManager.getNonInteractive()}, ConversationsPlusApplication.getSecureRandom());
 		final SSLSocketFactory factory = sc.getSocketFactory();
 		final HostnameVerifier verifier;
 		if (mInteractive) {
@@ -737,13 +736,13 @@ public class XmppConnection implements Runnable {
 		final Element auth = new Element("auth");
 		auth.setAttribute("xmlns", "urn:ietf:params:xml:ns:xmpp-sasl");
 		if (mechanisms.contains("EXTERNAL") && account.getPrivateKeyAlias() != null) {
-			saslMechanism = new External(tagWriter, account, mXmppConnectionService.getRNG());
+			saslMechanism = new External(tagWriter, account, ConversationsPlusApplication.getSecureRandom());
 		} else if (mechanisms.contains("SCRAM-SHA-1")) {
-			saslMechanism = new ScramSha1(tagWriter, account, mXmppConnectionService.getRNG());
+			saslMechanism = new ScramSha1(tagWriter, account, ConversationsPlusApplication.getSecureRandom());
 		} else if (mechanisms.contains("PLAIN")) {
 			saslMechanism = new Plain(tagWriter, account);
 		} else if (mechanisms.contains("DIGEST-MD5")) {
-			saslMechanism = new DigestMd5(tagWriter, account, mXmppConnectionService.getRNG());
+			saslMechanism = new DigestMd5(tagWriter, account, ConversationsPlusApplication.getSecureRandom());
 		}
 		if (saslMechanism != null) {
 			final JSONObject keys = account.getKeys();
@@ -1171,7 +1170,7 @@ public class XmppConnection implements Runnable {
 	}
 
 	private String nextRandomId() {
-		return new BigInteger(50, mXmppConnectionService.getRNG()).toString(32);
+		return new BigInteger(50, ConversationsPlusApplication.getSecureRandom()).toString(32);
 	}
 
 	public String sendIqPacket(final IqPacket packet, final OnIqPacketReceived callback) {
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..8b21cb9c
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredContentException.java
@@ -0,0 +1,26 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import de.thedevstack.conversationsplus.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..8c8162ef
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/MissingRequiredElementException.java
@@ -0,0 +1,26 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import de.thedevstack.conversationsplus.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/UnexpectedIqPacketTypeException.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/UnexpectedIqPacketTypeException.java
new file mode 100644
index 00000000..333f5dca
--- /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 de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.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..8c692f5b
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/exceptions/XmppException.java
@@ -0,0 +1,56 @@
+package de.thedevstack.conversationsplus.xmpp.exceptions;
+
+import de.thedevstack.conversationsplus.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/httpupload/HttpUpload.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/HttpUpload.java
new file mode 100644
index 00000000..28cba280
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/HttpUpload.java
@@ -0,0 +1,9 @@
+package de.thedevstack.conversationsplus.xmpp.httpupload;
+
+/**
+ *
+ */
+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/httpupload/HttpUploadRequestSlotPacketGenerator.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/HttpUploadRequestSlotPacketGenerator.java
new file mode 100644
index 00000000..59851417
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/HttpUploadRequestSlotPacketGenerator.java
@@ -0,0 +1,46 @@
+package de.thedevstack.conversationsplus.xmpp.httpupload;
+
+import de.thedevstack.conversationsplus.xmpp.jid.Jid;
+import de.thedevstack.conversationsplus.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/httpupload/HttpUploadSlot.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/HttpUploadSlot.java
new file mode 100644
index 00000000..14fe5103
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/HttpUploadSlot.java
@@ -0,0 +1,22 @@
+package de.thedevstack.conversationsplus.xmpp.httpupload;
+
+/**
+ *
+ */
+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/httpupload/SlotPacketParser.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/SlotPacketParser.java
new file mode 100644
index 00000000..0630449a
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/SlotPacketParser.java
@@ -0,0 +1,27 @@
+package de.thedevstack.conversationsplus.xmpp.httpupload;
+
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.xmpp.AbstractIqPacketParser;
+import de.thedevstack.conversationsplus.xmpp.exceptions.UnexpectedIqPacketTypeException;
+import de.thedevstack.conversationsplus.xmpp.exceptions.XmppException;
+import de.thedevstack.conversationsplus.xmpp.stanzas.IqPacket;
+
+/**
+ *
+ */
+public final class SlotPacketParser extends AbstractIqPacketParser {
+    public static HttpUploadSlot parseGetAndPutUrl(IqPacket packet) throws XmppException {
+        if (packet.getType() == IqPacket.TYPE.RESULT) {
+            Element slot = findRequiredChild(packet, "slot", HttpUpload.NAMESPACE);
+
+            String getUrl = findRequiredChildContent(slot, "get");
+            String putUrl = findRequiredChildContent(slot, "put");
+
+            return new HttpUploadSlot(getUrl, putUrl);
+        } else if (packet.getType() == IqPacket.TYPE.ERROR) {
+            throw new XmppException(); // Do proper handling of error cases
+        } else {
+            throw new UnexpectedIqPacketTypeException(packet, packet.getType(), IqPacket.TYPE.RESULT, IqPacket.TYPE.ERROR);
+        }
+    }
+}
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/SlotRequestPacket.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/SlotRequestPacket.java
new file mode 100644
index 00000000..d470d2f5
--- /dev/null
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/httpupload/SlotRequestPacket.java
@@ -0,0 +1,53 @@
+package de.thedevstack.conversationsplus.xmpp.httpupload;
+
+import de.thedevstack.conversationsplus.xml.Element;
+import de.thedevstack.conversationsplus.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/jingle/JingleConnection.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleConnection.java
index 422bdff0..ca823926 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleConnection.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleConnection.java
@@ -33,6 +33,7 @@ import de.thedevstack.conversationsplus.persistance.FileBackend;
 import de.thedevstack.conversationsplus.services.AbstractConnectionManager;
 import de.thedevstack.conversationsplus.services.XmppConnectionService;
 import de.thedevstack.conversationsplus.utils.FileUtils;
+import de.thedevstack.conversationsplus.utils.XmppConnectionServiceAccessor;
 import de.thedevstack.conversationsplus.xml.Element;
 import de.thedevstack.conversationsplus.xmpp.OnIqPacketReceived;
 import de.thedevstack.conversationsplus.xmpp.jid.Jid;
@@ -157,8 +158,7 @@ public class JingleConnection implements Transferable {
 
 	public JingleConnection(JingleConnectionManager mJingleConnectionManager) {
 		this.mJingleConnectionManager = mJingleConnectionManager;
-		this.mXmppConnectionService = mJingleConnectionManager
-				.getXmppConnectionService();
+		this.mXmppConnectionService = XmppConnectionServiceAccessor.xmppConnectionService;
 	}
 
 	public String getSessionId() {
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleConnectionManager.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleConnectionManager.java
index 2deb79c6..30ed9024 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleConnectionManager.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleConnectionManager.java
@@ -31,10 +31,6 @@ public class JingleConnectionManager extends AbstractConnectionManager {
 	@SuppressLint("TrulyRandom")
 	private SecureRandom random = new SecureRandom();
 
-	public JingleConnectionManager(XmppConnectionService service) {
-		super(service);
-	}
-
 	public void deliverPacket(Account account, JinglePacket packet) {
 		if (packet.isAction("session-initiate")) {
 			JingleConnection connection = new JingleConnection(this);
diff --git a/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleSocks5Transport.java b/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleSocks5Transport.java
index 9ea268d5..6480251f 100644
--- a/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleSocks5Transport.java
+++ b/src/main/java/de/thedevstack/conversationsplus/xmpp/jingle/JingleSocks5Transport.java
@@ -14,6 +14,7 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 
 import de.thedevstack.android.logcat.Logging;
+import de.thedevstack.conversationsplus.ConversationsPlusApplication;
 import de.thedevstack.conversationsplus.utils.StreamUtil;
 import de.thedevstack.conversationsplus.Config;
 import de.thedevstack.conversationsplus.entities.DownloadableFile;
@@ -84,7 +85,7 @@ public class JingleSocks5Transport extends JingleTransport {
 			@Override
 			public void run() {
 				InputStream fileInputStream = null;
-				final PowerManager.WakeLock wakeLock = connection.getConnectionManager().createWakeLock("jingle_send_"+connection.getSessionId());
+				final PowerManager.WakeLock wakeLock = ConversationsPlusApplication.createPartialWakeLock("jingle_send_"+connection.getSessionId());
 				try {
 					wakeLock.acquire();
 					MessageDigest digest = MessageDigest.getInstance("SHA-1");
@@ -134,7 +135,7 @@ public class JingleSocks5Transport extends JingleTransport {
 			@Override
 			public void run() {
 				OutputStream fileOutputStream = null;
-				final PowerManager.WakeLock wakeLock = connection.getConnectionManager().createWakeLock("jingle_receive_"+connection.getSessionId());
+				final PowerManager.WakeLock wakeLock = ConversationsPlusApplication.createPartialWakeLock("jingle_receive_"+connection.getSessionId());
 				try {
 					wakeLock.acquire();
 					MessageDigest digest = MessageDigest.getInstance("SHA-1");