Merge branch 'development'

31 files changed, 1441 insertions, 648 deletions

diff --git a/src/main/java/eu/siacs/conversations/Config.java b/src/main/java/eu/siacs/conversations/Config.java
index 779cbbe8..ce91244d 100644
--- a/src/main/java/eu/siacs/conversations/Config.java
+++ b/src/main/java/eu/siacs/conversations/Config.java
@@ -32,6 +32,8 @@ public final class Config {
 	public static final boolean EXTENDED_SM_LOGGING = true; // log stanza counts
 	public static final boolean RESET_ATTEMPT_COUNT_ON_NETWORK_CHANGE = true; //setting to true might increase power consumption
 
+	public static final boolean ENCRYPT_ON_HTTP_UPLOADED = false;
+
 	public static final long MILLISECONDS_IN_DAY = 24 * 60 * 60 * 1000;
 	public static final long MAM_MAX_CATCHUP =  MILLISECONDS_IN_DAY / 2;
 	public static final int MAM_MAX_MESSAGES = 500;
diff --git a/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java b/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
index ad5a4132..505c4b0f 100644
--- a/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
+++ b/src/main/java/eu/siacs/conversations/crypto/PgpEngine.java
@@ -59,9 +59,9 @@ public class PgpEngine {
 								message.setEncryption(Message.ENCRYPTION_DECRYPTED);
 								final HttpConnectionManager manager = mXmppConnectionService.getHttpConnectionManager();
 								if (message.trusted()
-										&& message.bodyContainsDownloadable()
+										&& message.treatAsDownloadable() != Message.Decision.NEVER
 										&& manager.getAutoAcceptFileSize() > 0) {
-									manager.createNewConnection(message);
+									manager.createNewDownloadConnection(message);
 								}
 								callback.success(message);
 							}
@@ -98,7 +98,7 @@ public class PgpEngine {
 						switch (result.getIntExtra(OpenPgpApi.RESULT_CODE,
 								OpenPgpApi.RESULT_CODE_ERROR)) {
 						case OpenPgpApi.RESULT_CODE_SUCCESS:
-							URL url = message.getImageParams().url;
+							URL url = message.getFileParams().url;
 							mXmppConnectionService.getFileBackend().updateFileParams(message,url);
 							message.setEncryption(Message.ENCRYPTION_DECRYPTED);
 							PgpEngine.this.mXmppConnectionService
@@ -143,11 +143,15 @@ public class PgpEngine {
 		params.putExtra(OpenPgpApi.EXTRA_ACCOUNT_NAME, message
 				.getConversation().getAccount().getJid().toBareJid().toString());
 
-		if (message.getType() == Message.TYPE_TEXT) {
+		if (!message.needsUploading()) {
 			params.putExtra(OpenPgpApi.EXTRA_REQUEST_ASCII_ARMOR, true);
-
-			InputStream is = new ByteArrayInputStream(message.getBody()
-					.getBytes());
+			String body;
+			if (message.hasFileOnRemoteHost()) {
+				body = message.getFileParams().url.toString();
+			} else {
+				body = message.getBody();
+			}
+			InputStream is = new ByteArrayInputStream(body.getBytes());
 			final OutputStream os = new ByteArrayOutputStream();
 			api.executeApiAsync(params, is, os, new IOpenPgpCallback() {
 
@@ -184,7 +188,7 @@ public class PgpEngine {
 					}
 				}
 			});
-		} else if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE) {
+		} else {
 			try {
 				DownloadableFile inputFile = this.mXmppConnectionService
 						.getFileBackend().getFile(message, true);
diff --git a/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java b/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java
index 10cd3167..c95a62df 100644
--- a/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java
+++ b/src/main/java/eu/siacs/conversations/crypto/sasl/ScramSha1.java
@@ -185,7 +185,7 @@ public class ScramSha1 extends SaslMechanism {
 			case RESPONSE_SENT:
 				final String clientCalculatedServerFinalMessage = "v=" +
 					Base64.encodeToString(serverSignature, Base64.NO_WRAP);
-				if (!clientCalculatedServerFinalMessage.equals(new String(Base64.decode(challenge, Base64.DEFAULT)))) {
+				if (challenge == null || !clientCalculatedServerFinalMessage.equals(new String(Base64.decode(challenge, Base64.DEFAULT)))) {
 					throw new AuthenticationException("Server final message does not match calculated final message");
 				}
 				state = State.VALID_SERVER_RESPONSE;
diff --git a/src/main/java/eu/siacs/conversations/entities/Account.java b/src/main/java/eu/siacs/conversations/entities/Account.java
index 6e6dcb6a..f472361f 100644
--- a/src/main/java/eu/siacs/conversations/entities/Account.java
+++ b/src/main/java/eu/siacs/conversations/entities/Account.java
@@ -44,6 +44,10 @@ public class Account extends AbstractEntity {
 	public static final int OPTION_REGISTER = 2;
 	public static final int OPTION_USECOMPRESSION = 3;
 
+	public boolean httpUploadAvailable() {
+		return xmppConnection != null && xmppConnection.getFeatures().httpUpload();
+	}
+
 	public static enum State {
 		DISABLED,
 		OFFLINE,
diff --git a/src/main/java/eu/siacs/conversations/entities/Downloadable.java b/src/main/java/eu/siacs/conversations/entities/Downloadable.java
deleted file mode 100644
index d25bf93a..00000000
--- a/src/main/java/eu/siacs/conversations/entities/Downloadable.java
+++ /dev/null
@@ -1,28 +0,0 @@
-package eu.siacs.conversations.entities;
-
-public interface Downloadable {
-
-	public final String[] VALID_IMAGE_EXTENSIONS = {"webp", "jpeg", "jpg", "png", "jpe"};
-	public final String[] VALID_CRYPTO_EXTENSIONS = {"pgp", "gpg", "otr"};
-
-	public static final int STATUS_UNKNOWN = 0x200;
-	public static final int STATUS_CHECKING = 0x201;
-	public static final int STATUS_FAILED = 0x202;
-	public static final int STATUS_OFFER = 0x203;
-	public static final int STATUS_DOWNLOADING = 0x204;
-	public static final int STATUS_DELETED = 0x205;
-	public static final int STATUS_OFFER_CHECK_FILESIZE = 0x206;
-	public static final int STATUS_UPLOADING = 0x207;
-
-	public boolean start();
-
-	public int getStatus();
-
-	public long getFileSize();
-
-	public int getProgress();
-
-	public String getMimeType();
-
-	public void cancel();
-}
diff --git a/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java b/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java
index 7c8f95d1..ae9ba1f1 100644
--- a/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java
+++ b/src/main/java/eu/siacs/conversations/entities/DownloadableFile.java
@@ -20,6 +20,8 @@ import javax.crypto.spec.IvParameterSpec;
 import javax.crypto.spec.SecretKeySpec;
 
 import eu.siacs.conversations.Config;
+import eu.siacs.conversations.utils.MimeUtils;
+
 import android.util.Log;
 
 public class DownloadableFile extends File {
@@ -56,16 +58,11 @@ public class DownloadableFile extends File {
 
 	public String getMimeType() {
 		String path = this.getAbsolutePath();
-		try {
-			String mime = URLConnection.guessContentTypeFromName(path.replace("#",""));
-			if (mime != null) {
-				return mime;
-			} else if (mime == null && path.endsWith(".webp")) {
-				return "image/webp";
-			} else {
-				return "";
-			}
-		} catch (final StringIndexOutOfBoundsException e) {
+		int start = path.lastIndexOf('.') + 1;
+		if (start < path.length()) {
+			String mime = MimeUtils.guessMimeTypeFromExtension(path.substring(start));
+			return mime == null ? "" : mime;
+		} else {
 			return "";
 		}
 	}
diff --git a/src/main/java/eu/siacs/conversations/entities/Message.java b/src/main/java/eu/siacs/conversations/entities/Message.java
index a63d033d..28ef89df 100644
--- a/src/main/java/eu/siacs/conversations/entities/Message.java
+++ b/src/main/java/eu/siacs/conversations/entities/Message.java
@@ -9,6 +9,7 @@ import java.util.Arrays;
 
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.utils.GeoHelper;
+import eu.siacs.conversations.utils.MimeUtils;
 import eu.siacs.conversations.utils.UIHelper;
 import eu.siacs.conversations.xmpp.jid.InvalidJidException;
 import eu.siacs.conversations.xmpp.jid.Jid;
@@ -69,7 +70,7 @@ public class Message extends AbstractEntity {
 	protected String remoteMsgId = null;
 	protected String serverMsgId = null;
 	protected Conversation conversation = null;
-	protected Downloadable downloadable = null;
+	protected Transferable transferable = null;
 	private Message mNextMessage = null;
 	private Message mPreviousMessage = null;
 
@@ -307,12 +308,12 @@ public class Message extends AbstractEntity {
 		this.trueCounterpart = trueCounterpart;
 	}
 
-	public Downloadable getDownloadable() {
-		return this.downloadable;
+	public Transferable getTransferable() {
+		return this.transferable;
 	}
 
-	public void setDownloadable(Downloadable downloadable) {
-		this.downloadable = downloadable;
+	public void setTransferable(Transferable transferable) {
+		this.transferable = transferable;
 	}
 
 	public boolean equals(Message message) {
@@ -363,8 +364,8 @@ public class Message extends AbstractEntity {
 	public boolean mergeable(final Message message) {
 		return message != null &&
 				(message.getType() == Message.TYPE_TEXT &&
-						this.getDownloadable() == null &&
-						message.getDownloadable() == null &&
+						this.getTransferable() == null &&
+						message.getTransferable() == null &&
 						message.getEncryption() != Message.ENCRYPTION_PGP &&
 						this.getType() == message.getType() &&
 						//this.getStatus() == message.getStatus() &&
@@ -375,8 +376,8 @@ public class Message extends AbstractEntity {
 						(message.getTimeSent() - this.getTimeSent()) <= (Config.MESSAGE_MERGE_WINDOW * 1000) &&
 						!GeoHelper.isGeoUri(message.getBody()) &&
 						!GeoHelper.isGeoUri(this.body) &&
-						!message.bodyContainsDownloadable() &&
-						!this.bodyContainsDownloadable() &&
+						message.treatAsDownloadable() == Decision.NEVER &&
+						this.treatAsDownloadable() == Decision.NEVER &&
 						!message.getBody().startsWith(ME_COMMAND) &&
 						!this.getBody().startsWith(ME_COMMAND) &&
 						!this.bodyIsHeart() &&
@@ -434,48 +435,97 @@ public class Message extends AbstractEntity {
 		return (status > STATUS_RECEIVED || (contact != null && contact.trusted()));
 	}
 
-	public boolean bodyContainsDownloadable() {
-		/**
-		 * there are a few cases where spaces result in an unwanted behavior, e.g.
-		 * "http://example.com/image.jpg text that will not be shown /abc.png"
-		 * or more than one image link in one message.
-		 */
-		if (body.trim().contains(" ")) {
+	public boolean fixCounterpart() {
+		Presences presences = conversation.getContact().getPresences();
+		if (counterpart != null && presences.has(counterpart.getResourcepart())) {
+			return true;
+		} else if (presences.size() >= 1) {
+			try {
+				counterpart = Jid.fromParts(conversation.getJid().getLocalpart(),
+						conversation.getJid().getDomainpart(),
+						presences.asStringArray()[0]);
+				return true;
+			} catch (InvalidJidException e) {
+				counterpart = null;
+				return false;
+			}
+		} else {
+			counterpart = null;
 			return false;
 		}
+	}
+
+	public enum Decision {
+		MUST,
+		SHOULD,
+		NEVER,
+	}
+
+	private static String extractRelevantExtension(URL url) {
+		String path = url.getPath();
+		if (path == null || path.isEmpty()) {
+			return null;
+		}
+		String filename = path.substring(path.lastIndexOf('/') + 1).toLowerCase();
+		String[] extensionParts = filename.split("\\.");
+		if (extensionParts.length == 2) {
+			return extensionParts[extensionParts.length - 1];
+		} else if (extensionParts.length == 3 && Arrays
+				.asList(Transferable.VALID_CRYPTO_EXTENSIONS)
+				.contains(extensionParts[extensionParts.length - 1])) {
+			return extensionParts[extensionParts.length -2];
+		}
+		return null;
+	}
+
+	public String getMimeType() {
+		if (relativeFilePath != null) {
+			int start = relativeFilePath.lastIndexOf('.') + 1;
+			if (start < relativeFilePath.length()) {
+				return MimeUtils.guessMimeTypeFromExtension(relativeFilePath.substring(start));
+			} else {
+				return null;
+			}
+		} else {
+			try {
+				return MimeUtils.guessMimeTypeFromExtension(extractRelevantExtension(new URL(body.trim())));
+			} catch (MalformedURLException e) {
+				return null;
+			}
+		}
+	}
+
+	public Decision treatAsDownloadable() {
+		if (body.trim().contains(" ")) {
+			return Decision.NEVER;
+		}
 		try {
 			URL url = new URL(body);
-			if (!url.getProtocol().equalsIgnoreCase("http")
-					&& !url.getProtocol().equalsIgnoreCase("https")) {
-				return false;
+			if (!url.getProtocol().equalsIgnoreCase("http") && !url.getProtocol().equalsIgnoreCase("https")) {
+				return Decision.NEVER;
 			}
-
-			String sUrlPath = url.getPath();
-			if (sUrlPath == null || sUrlPath.isEmpty()) {
-				return false;
+			String extension = extractRelevantExtension(url);
+			if (extension == null) {
+				return Decision.NEVER;
 			}
+			String ref = url.getRef();
+			boolean encrypted = ref != null && ref.matches("([A-Fa-f0-9]{2}){48}");
 
-			int iSlashIndex = sUrlPath.lastIndexOf('/') + 1;
-
-			String sLastUrlPath = sUrlPath.substring(iSlashIndex).toLowerCase();
-
-			String[] extensionParts = sLastUrlPath.split("\\.");
-			if (extensionParts.length == 2
-					&& Arrays.asList(Downloadable.VALID_IMAGE_EXTENSIONS).contains(
-					extensionParts[extensionParts.length - 1])) {
-				return true;
-			} else if (extensionParts.length == 3
-					&& Arrays
-					.asList(Downloadable.VALID_CRYPTO_EXTENSIONS)
-					.contains(extensionParts[extensionParts.length - 1])
-					&& Arrays.asList(Downloadable.VALID_IMAGE_EXTENSIONS).contains(
-					extensionParts[extensionParts.length - 2])) {
-				return true;
+			if (encrypted) {
+				if (MimeUtils.guessMimeTypeFromExtension(extension) != null) {
+					return Decision.MUST;
+				} else {
+					return Decision.NEVER;
+				}
+			} else if (Arrays.asList(Transferable.VALID_IMAGE_EXTENSIONS).contains(extension)
+					|| Arrays.asList(Transferable.WELL_KNOWN_EXTENSIONS).contains(extension)) {
+				return Decision.SHOULD;
 			} else {
-				return false;
+				return Decision.NEVER;
 			}
+
 		} catch (MalformedURLException e) {
-			return false;
+			return Decision.NEVER;
 		}
 	}
 
@@ -483,74 +533,77 @@ public class Message extends AbstractEntity {
 		return body != null && UIHelper.HEARTS.contains(body.trim());
 	}
 
-	public ImageParams getImageParams() {
-		ImageParams params = getLegacyImageParams();
+	public FileParams getFileParams() {
+		FileParams params = getLegacyFileParams();
 		if (params != null) {
 			return params;
 		}
-		params = new ImageParams();
-		if (this.downloadable != null) {
-			params.size = this.downloadable.getFileSize();
+		params = new FileParams();
+		if (this.transferable != null) {
+			params.size = this.transferable.getFileSize();
 		}
 		if (body == null) {
 			return params;
 		}
 		String parts[] = body.split("\\|");
-		if (parts.length == 1) {
-			try {
-				params.size = Long.parseLong(parts[0]);
-			} catch (NumberFormatException e) {
-				params.origin = parts[0];
+		switch (parts.length) {
+			case 1:
+				try {
+					params.size = Long.parseLong(parts[0]);
+				} catch (NumberFormatException e) {
+					try {
+						params.url = new URL(parts[0]);
+					} catch (MalformedURLException e1) {
+						params.url = null;
+					}
+				}
+				break;
+			case 2:
+			case 4:
 				try {
 					params.url = new URL(parts[0]);
 				} catch (MalformedURLException e1) {
 					params.url = null;
 				}
-			}
-		} else if (parts.length == 3) {
-			try {
-				params.size = Long.parseLong(parts[0]);
-			} catch (NumberFormatException e) {
-				params.size = 0;
-			}
-			try {
-				params.width = Integer.parseInt(parts[1]);
-			} catch (NumberFormatException e) {
-				params.width = 0;
-			}
-			try {
-				params.height = Integer.parseInt(parts[2]);
-			} catch (NumberFormatException e) {
-				params.height = 0;
-			}
-		} else if (parts.length == 4) {
-			params.origin = parts[0];
-			try {
-				params.url = new URL(parts[0]);
-			} catch (MalformedURLException e1) {
-				params.url = null;
-			}
-			try {
-				params.size = Long.parseLong(parts[1]);
-			} catch (NumberFormatException e) {
-				params.size = 0;
-			}
-			try {
-				params.width = Integer.parseInt(parts[2]);
-			} catch (NumberFormatException e) {
-				params.width = 0;
-			}
-			try {
-				params.height = Integer.parseInt(parts[3]);
-			} catch (NumberFormatException e) {
-				params.height = 0;
-			}
+				try {
+					params.size = Long.parseLong(parts[1]);
+				} catch (NumberFormatException e) {
+					params.size = 0;
+				}
+				try {
+					params.width = Integer.parseInt(parts[2]);
+				} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
+					params.width = 0;
+				}
+				try {
+					params.height = Integer.parseInt(parts[3]);
+				} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
+					params.height = 0;
+				}
+				break;
+			case 3:
+				try {
+					params.size = Long.parseLong(parts[0]);
+				} catch (NumberFormatException e) {
+					params.size = 0;
+				}
+				try {
+					params.width = Integer.parseInt(parts[1]);
+				} catch (NumberFormatException e) {
+					params.width = 0;
+				}
+				try {
+					params.height = Integer.parseInt(parts[2]);
+				} catch (NumberFormatException e) {
+					params.height = 0;
+				}
+				break;
 		}
 		return params;
 	}
 
-	public ImageParams getLegacyImageParams() {
-		ImageParams params = new ImageParams();
+	public FileParams getLegacyFileParams() {
+		FileParams params = new FileParams();
 		if (body == null) {
 			return params;
 		}
@@ -586,11 +639,18 @@ public class Message extends AbstractEntity {
 		return type == TYPE_FILE || type == TYPE_IMAGE;
 	}
 
-	public class ImageParams {
+	public boolean hasFileOnRemoteHost() {
+		return isFileOrImage() && getFileParams().url != null;
+	}
+
+	public boolean needsUploading() {
+		return isFileOrImage() && getFileParams().url == null;
+	}
+
+	public class FileParams {
 		public URL url;
 		public long size = 0;
 		public int width = 0;
 		public int height = 0;
-		public String origin;
 	}
 }
diff --git a/src/main/java/eu/siacs/conversations/entities/Transferable.java b/src/main/java/eu/siacs/conversations/entities/Transferable.java
new file mode 100644
index 00000000..2db6e3c9
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/entities/Transferable.java
@@ -0,0 +1,28 @@
+package eu.siacs.conversations.entities;
+
+public interface Transferable {
+
+	String[] VALID_IMAGE_EXTENSIONS = {"webp", "jpeg", "jpg", "png", "jpe"};
+	String[] VALID_CRYPTO_EXTENSIONS = {"pgp", "gpg", "otr"};
+	String[] WELL_KNOWN_EXTENSIONS = {"pdf","m4a"};
+
+	int STATUS_UNKNOWN = 0x200;
+	int STATUS_CHECKING = 0x201;
+	int STATUS_FAILED = 0x202;
+	int STATUS_OFFER = 0x203;
+	int STATUS_DOWNLOADING = 0x204;
+	int STATUS_DELETED = 0x205;
+	int STATUS_OFFER_CHECK_FILESIZE = 0x206;
+	int STATUS_UPLOADING = 0x207;
+
+
+	boolean start();
+
+	int getStatus();
+
+	long getFileSize();
+
+	int getProgress();
+
+	void cancel();
+}
diff --git a/src/main/java/eu/siacs/conversations/entities/DownloadablePlaceholder.java b/src/main/java/eu/siacs/conversations/entities/TransferablePlaceholder.java
index 03fceceb..e065953e 100644
--- a/src/main/java/eu/siacs/conversations/entities/DownloadablePlaceholder.java
+++ b/src/main/java/eu/siacs/conversations/entities/TransferablePlaceholder.java
@@ -1,10 +1,10 @@
 package eu.siacs.conversations.entities;
 
-public class DownloadablePlaceholder implements Downloadable {
+public class TransferablePlaceholder implements Transferable {
 
 	private int status;
 
-	public DownloadablePlaceholder(int status) {
+	public TransferablePlaceholder(int status) {
 		this.status = status;
 	}
 	@Override
@@ -28,11 +28,6 @@ public class DownloadablePlaceholder implements Downloadable {
 	}
 
 	@Override
-	public String getMimeType() {
-		return "";
-	}
-
-	@Override
 	public void cancel() {
 
 	}
diff --git a/src/main/java/eu/siacs/conversations/generator/IqGenerator.java b/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
index d7366daa..47915e3f 100644
--- a/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
+++ b/src/main/java/eu/siacs/conversations/generator/IqGenerator.java
@@ -6,6 +6,7 @@ import java.util.List;
 
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Conversation;
+import eu.siacs.conversations.entities.DownloadableFile;
 import eu.siacs.conversations.services.MessageArchiveService;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.utils.PhoneHelper;
@@ -102,7 +103,7 @@ public class IqGenerator extends AbstractGenerator {
 	public IqPacket retrieveVcardAvatar(final Avatar avatar) {
 		final IqPacket packet = new IqPacket(IqPacket.TYPE.GET);
 		packet.setTo(avatar.owner);
-		packet.addChild("vCard","vcard-temp");
+		packet.addChild("vCard", "vcard-temp");
 		return packet;
 	}
 
@@ -194,4 +195,13 @@ public class IqGenerator extends AbstractGenerator {
 		item.setAttribute("role", role);
 		return packet;
 	}
+
+	public IqPacket requestHttpUploadSlot(Jid host, DownloadableFile file) {
+		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()));
+		return packet;
+	}
 }
diff --git a/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java b/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java
index 474a3e1d..bc1148d9 100644
--- a/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java
+++ b/src/main/java/eu/siacs/conversations/generator/MessageGenerator.java
@@ -73,7 +73,13 @@ public class MessageGenerator extends AbstractGenerator {
 		packet.addChild("no-copy", "urn:xmpp:hints");
 		packet.addChild("no-permanent-store", "urn:xmpp:hints");
 		try {
-			packet.setBody(otrSession.transformSending(message.getBody())[0]);
+			String content;
+			if (message.hasFileOnRemoteHost()) {
+				content = message.getFileParams().url.toString();
+			} else {
+				content = message.getBody();
+			}
+			packet.setBody(otrSession.transformSending(content)[0]);
 			return packet;
 		} catch (OtrException e) {
 			return null;
@@ -86,7 +92,11 @@ public class MessageGenerator extends AbstractGenerator {
 
 	public MessagePacket generateChat(Message message, boolean addDelay) {
 		MessagePacket packet = preparePacket(message, addDelay);
-		packet.setBody(message.getBody());
+		if (message.hasFileOnRemoteHost()) {
+			packet.setBody(message.getFileParams().url.toString());
+		} else {
+			packet.setBody(message.getBody());
+		}
 		return packet;
 	}
 
@@ -96,13 +106,11 @@ public class MessageGenerator extends AbstractGenerator {
 
 	public MessagePacket generatePgpChat(Message message, boolean addDelay) {
 		MessagePacket packet = preparePacket(message, addDelay);
-		packet.setBody("This is an XEP-0027 encryted message");
+		packet.setBody("This is an XEP-0027 encrypted message");
 		if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
-			packet.addChild("x", "jabber:x:encrypted").setContent(
-					message.getEncryptedBody());
+			packet.addChild("x", "jabber:x:encrypted").setContent(message.getEncryptedBody());
 		} else if (message.getEncryption() == Message.ENCRYPTION_PGP) {
-			packet.addChild("x", "jabber:x:encrypted").setContent(
-					message.getBody());
+			packet.addChild("x", "jabber:x:encrypted").setContent(message.getBody());
 		}
 		return packet;
 	}
diff --git a/src/main/java/eu/siacs/conversations/http/HttpConnectionManager.java b/src/main/java/eu/siacs/conversations/http/HttpConnectionManager.java
index 9a2a2405..58a6d1e3 100644
--- a/src/main/java/eu/siacs/conversations/http/HttpConnectionManager.java
+++ b/src/main/java/eu/siacs/conversations/http/HttpConnectionManager.java
@@ -1,11 +1,22 @@
 package eu.siacs.conversations.http;
 
+import org.apache.http.conn.ssl.StrictHostnameVerifier;
+
+import java.security.KeyManagementException;
+import java.security.NoSuchAlgorithmException;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 
+import javax.net.ssl.HostnameVerifier;
+import javax.net.ssl.HttpsURLConnection;
+import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLSocketFactory;
+import javax.net.ssl.X509TrustManager;
+
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.services.AbstractConnectionManager;
 import eu.siacs.conversations.services.XmppConnectionService;
+import eu.siacs.conversations.utils.CryptoHelper;
 
 public class HttpConnectionManager extends AbstractConnectionManager {
 
@@ -13,16 +24,67 @@ public class HttpConnectionManager extends AbstractConnectionManager {
 		super(service);
 	}
 
-	private List<HttpConnection> connections = new CopyOnWriteArrayList<HttpConnection>();
+	private List<HttpDownloadConnection> downloadConnections = new CopyOnWriteArrayList<>();
+	private List<HttpUploadConnection> uploadConnections = new CopyOnWriteArrayList<>();
+
+	public HttpDownloadConnection createNewDownloadConnection(Message message) {
+		return this.createNewDownloadConnection(message, false);
+	}
+
+	public HttpDownloadConnection createNewDownloadConnection(Message message, boolean interactive) {
+		HttpDownloadConnection connection = new HttpDownloadConnection(this);
+		connection.init(message,interactive);
+		this.downloadConnections.add(connection);
+		return connection;
+	}
 
-	public HttpConnection createNewConnection(Message message) {
-		HttpConnection connection = new HttpConnection(this);
+	public HttpUploadConnection createNewUploadConnection(Message message) {
+		HttpUploadConnection connection = new HttpUploadConnection(this);
 		connection.init(message);
-		this.connections.add(connection);
+		this.uploadConnections.add(connection);
 		return connection;
 	}
 
-	public void finishConnection(HttpConnection connection) {
-		this.connections.remove(connection);
+	public void finishConnection(HttpDownloadConnection connection) {
+		this.downloadConnections.remove(connection);
+	}
+
+	public void finishUploadConnection(HttpUploadConnection httpUploadConnection) {
+		this.uploadConnections.remove(httpUploadConnection);
+	}
+
+	public void setupTrustManager(final HttpsURLConnection connection, final boolean interactive) {
+		final X509TrustManager trustManager;
+		final HostnameVerifier hostnameVerifier;
+		if (interactive) {
+			trustManager = mXmppConnectionService.getMemorizingTrustManager();
+			hostnameVerifier = mXmppConnectionService
+					.getMemorizingTrustManager().wrapHostnameVerifier(
+							new StrictHostnameVerifier());
+		} else {
+			trustManager = mXmppConnectionService.getMemorizingTrustManager()
+					.getNonInteractive();
+			hostnameVerifier = mXmppConnectionService
+					.getMemorizingTrustManager()
+					.wrapHostnameVerifierNonInteractive(
+							new StrictHostnameVerifier());
+		}
+		try {
+			final SSLContext sc = SSLContext.getInstance("TLS");
+			sc.init(null, new X509TrustManager[]{trustManager},
+					mXmppConnectionService.getRNG());
+
+			final SSLSocketFactory sf = sc.getSocketFactory();
+			final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
+					sf.getSupportedCipherSuites());
+			if (cipherSuites.length > 0) {
+				sc.getDefaultSSLParameters().setCipherSuites(cipherSuites);
+
+			}
+
+			connection.setSSLSocketFactory(sf);
+			connection.setHostnameVerifier(hostnameVerifier);
+		} catch (final KeyManagementException | NoSuchAlgorithmException ignored) {
+		}
 	}
 }
diff --git a/src/main/java/eu/siacs/conversations/http/HttpConnection.java b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
index e7d30919..6fcd8c87 100644
--- a/src/main/java/eu/siacs/conversations/http/HttpConnection.java
+++ b/src/main/java/eu/siacs/conversations/http/HttpDownloadConnection.java
@@ -3,8 +3,7 @@ package eu.siacs.conversations.http;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.SystemClock;
-
-import org.apache.http.conn.ssl.StrictHostnameVerifier;
+import android.util.Log;
 
 import java.io.BufferedInputStream;
 import java.io.IOException;
@@ -12,25 +11,20 @@ import java.io.OutputStream;
 import java.net.HttpURLConnection;
 import java.net.MalformedURLException;
 import java.net.URL;
-import java.security.KeyManagementException;
-import java.security.NoSuchAlgorithmException;
 import java.util.Arrays;
 
-import javax.net.ssl.HostnameVerifier;
 import javax.net.ssl.HttpsURLConnection;
-import javax.net.ssl.SSLContext;
 import javax.net.ssl.SSLHandshakeException;
-import javax.net.ssl.SSLSocketFactory;
-import javax.net.ssl.X509TrustManager;
 
 import eu.siacs.conversations.Config;
-import eu.siacs.conversations.entities.Downloadable;
+import eu.siacs.conversations.R;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.DownloadableFile;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.utils.CryptoHelper;
 
-public class HttpConnection implements Downloadable {
+public class HttpDownloadConnection implements Transferable {
 
 	private HttpConnectionManager mHttpConnectionManager;
 	private XmppConnectionService mXmppConnectionService;
@@ -38,12 +32,12 @@ public class HttpConnection implements Downloadable {
 	private URL mUrl;
 	private Message message;
 	private DownloadableFile file;
-	private int mStatus = Downloadable.STATUS_UNKNOWN;
+	private int mStatus = Transferable.STATUS_UNKNOWN;
 	private boolean acceptedAutomatically = false;
 	private int mProgress = 0;
 	private long mLastGuiRefresh = 0;
 
-	public HttpConnection(HttpConnectionManager manager) {
+	public HttpDownloadConnection(HttpConnectionManager manager) {
 		this.mHttpConnectionManager = manager;
 		this.mXmppConnectionService = manager.getXmppConnectionService();
 	}
@@ -63,8 +57,12 @@ public class HttpConnection implements Downloadable {
 	}
 
 	public void init(Message message) {
+		init(message, false);
+	}
+
+	public void init(Message message, boolean interactive) {
 		this.message = message;
-		this.message.setDownloadable(this);
+		this.message.setTransferable(this);
 		try {
 			mUrl = new URL(message.getBody());
 			String[] parts = mUrl.getPath().toLowerCase().split("\\.");
@@ -92,7 +90,7 @@ public class HttpConnection implements Downloadable {
 					&& this.file.getKey() == null) {
 				this.message.setEncryption(Message.ENCRYPTION_NONE);
 					}
-			checkFileSize(false);
+			checkFileSize(true);
 		} catch (MalformedURLException e) {
 			this.cancel();
 		}
@@ -104,7 +102,7 @@ public class HttpConnection implements Downloadable {
 
 	public void cancel() {
 		mHttpConnectionManager.finishConnection(this);
-		message.setDownloadable(null);
+		message.setTransferable(null);
 		mXmppConnectionService.updateConversationUi();
 	}
 
@@ -112,7 +110,7 @@ public class HttpConnection implements Downloadable {
 		Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
 		intent.setData(Uri.fromFile(file));
 		mXmppConnectionService.sendBroadcast(intent);
-		message.setDownloadable(null);
+		message.setTransferable(null);
 		mHttpConnectionManager.finishConnection(this);
 		mXmppConnectionService.updateConversationUi();
 		if (acceptedAutomatically) {
@@ -125,42 +123,6 @@ public class HttpConnection implements Downloadable {
 		mXmppConnectionService.updateConversationUi();
 	}
 
-	private void setupTrustManager(final HttpsURLConnection connection,
-			final boolean interactive) {
-		final X509TrustManager trustManager;
-		final HostnameVerifier hostnameVerifier;
-		if (interactive) {
-			trustManager = mXmppConnectionService.getMemorizingTrustManager();
-			hostnameVerifier = mXmppConnectionService
-				.getMemorizingTrustManager().wrapHostnameVerifier(
-						new StrictHostnameVerifier());
-		} else {
-			trustManager = mXmppConnectionService.getMemorizingTrustManager()
-				.getNonInteractive();
-			hostnameVerifier = mXmppConnectionService
-				.getMemorizingTrustManager()
-				.wrapHostnameVerifierNonInteractive(
-						new StrictHostnameVerifier());
-		}
-		try {
-			final SSLContext sc = SSLContext.getInstance("TLS");
-			sc.init(null, new X509TrustManager[]{trustManager},
-					mXmppConnectionService.getRNG());
-
-			final SSLSocketFactory sf = sc.getSocketFactory();
-			final String[] cipherSuites = CryptoHelper.getOrderedCipherSuites(
-					sf.getSupportedCipherSuites());
-			if (cipherSuites.length > 0) {
-				sc.getDefaultSSLParameters().setCipherSuites(cipherSuites);
-
-			}
-
-			connection.setSSLSocketFactory(sf);
-			connection.setHostnameVerifier(hostnameVerifier);
-		} catch (final KeyManagementException | NoSuchAlgorithmException ignored) {
-		}
-	}
-
 	private class FileSizeChecker implements Runnable {
 
 		private boolean interactive = false;
@@ -176,43 +138,46 @@ public class HttpConnection implements Downloadable {
 				size = retrieveFileSize();
 			} catch (SSLHandshakeException e) {
 				changeStatus(STATUS_OFFER_CHECK_FILESIZE);
-				HttpConnection.this.acceptedAutomatically = false;
-				HttpConnection.this.mXmppConnectionService.getNotificationService().push(message);
+				HttpDownloadConnection.this.acceptedAutomatically = false;
+				HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
 				return;
 			} catch (IOException e) {
+				Log.d(Config.LOGTAG, "io exception in http file size checker: " + e.getMessage());
+				if (interactive) {
+					mXmppConnectionService.showErrorToastInUi(R.string.file_not_found_on_remote_host);
+				}
 				cancel();
 				return;
 			}
 			file.setExpectedSize(size);
 			if (size <= mHttpConnectionManager.getAutoAcceptFileSize()) {
-				HttpConnection.this.acceptedAutomatically = true;
+				HttpDownloadConnection.this.acceptedAutomatically = true;
 				new Thread(new FileDownloader(interactive)).start();
 			} else {
 				changeStatus(STATUS_OFFER);
-				HttpConnection.this.acceptedAutomatically = false;
-				HttpConnection.this.mXmppConnectionService.getNotificationService().push(message);
+				HttpDownloadConnection.this.acceptedAutomatically = false;
+				HttpDownloadConnection.this.mXmppConnectionService.getNotificationService().push(message);
 			}
 		}
 
-		private long retrieveFileSize() throws IOException,
-						SSLHandshakeException {
-							changeStatus(STATUS_CHECKING);
-							HttpURLConnection connection = (HttpURLConnection) mUrl
-								.openConnection();
-							connection.setRequestMethod("HEAD");
-							if (connection instanceof HttpsURLConnection) {
-								setupTrustManager((HttpsURLConnection) connection, interactive);
-							}
-							connection.connect();
-							String contentLength = connection.getHeaderField("Content-Length");
-							if (contentLength == null) {
-								throw new IOException();
-							}
-							try {
-								return Long.parseLong(contentLength, 10);
-							} catch (NumberFormatException e) {
-								throw new IOException();
-							}
+		private long retrieveFileSize() throws IOException {
+			Log.d(Config.LOGTAG,"retrieve file size. interactive:"+String.valueOf(interactive));
+			changeStatus(STATUS_CHECKING);
+			HttpURLConnection connection = (HttpURLConnection) mUrl.openConnection();
+			connection.setRequestMethod("HEAD");
+			if (connection instanceof HttpsURLConnection) {
+				mHttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, interactive);
+			}
+			connection.connect();
+			String contentLength = connection.getHeaderField("Content-Length");
+			if (contentLength == null) {
+				throw new IOException();
+			}
+			try {
+				return Long.parseLong(contentLength, 10);
+			} catch (NumberFormatException e) {
+				throw new IOException();
+			}
 		}
 
 	}
@@ -235,19 +200,18 @@ public class HttpConnection implements Downloadable {
 			} catch (SSLHandshakeException e) {
 				changeStatus(STATUS_OFFER);
 			} catch (IOException e) {
+				mXmppConnectionService.showErrorToastInUi(R.string.file_not_found_on_remote_host);
 				cancel();
 			}
 		}
 
 		private void download() throws SSLHandshakeException, IOException {
-			HttpURLConnection connection = (HttpURLConnection) mUrl
-				.openConnection();
+			HttpURLConnection connection = (HttpURLConnection) mUrl.openConnection();
 			if (connection instanceof HttpsURLConnection) {
-				setupTrustManager((HttpsURLConnection) connection, interactive);
+				mHttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, interactive);
 			}
 			connection.connect();
-			BufferedInputStream is = new BufferedInputStream(
-					connection.getInputStream());
+			BufferedInputStream is = new BufferedInputStream(connection.getInputStream());
 			file.getParentFile().mkdirs();
 			file.createNewFile();
 			OutputStream os = file.createOutputStream();
@@ -269,8 +233,8 @@ public class HttpConnection implements Downloadable {
 		}
 
 		private void updateImageBounds() {
-			message.setType(Message.TYPE_IMAGE);
-			mXmppConnectionService.getFileBackend().updateFileParams(message,mUrl);
+			message.setType(Message.TYPE_FILE);
+			mXmppConnectionService.getFileBackend().updateFileParams(message, mUrl);
 			mXmppConnectionService.updateMessage(message);
 		}
 
@@ -302,9 +266,4 @@ public class HttpConnection implements Downloadable {
 	public int getProgress() {
 		return this.mProgress;
 	}
-
-	@Override
-	public String getMimeType() {
-		return "";
-	}
 }
diff --git a/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java b/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
new file mode 100644
index 00000000..dd842754
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java
@@ -0,0 +1,204 @@
+package eu.siacs.conversations.http;
+
+import android.app.PendingIntent;
+import android.util.Log;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+
+import javax.net.ssl.HttpsURLConnection;
+
+import eu.siacs.conversations.Config;
+import eu.siacs.conversations.entities.Account;
+import eu.siacs.conversations.entities.Transferable;
+import eu.siacs.conversations.entities.DownloadableFile;
+import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.persistance.FileBackend;
+import eu.siacs.conversations.services.XmppConnectionService;
+import eu.siacs.conversations.ui.UiCallback;
+import eu.siacs.conversations.utils.CryptoHelper;
+import eu.siacs.conversations.utils.Xmlns;
+import eu.siacs.conversations.xml.Element;
+import eu.siacs.conversations.xmpp.OnIqPacketReceived;
+import eu.siacs.conversations.xmpp.jid.Jid;
+import eu.siacs.conversations.xmpp.stanzas.IqPacket;
+
+public class HttpUploadConnection implements Transferable {
+
+	private HttpConnectionManager mHttpConnectionManager;
+	private XmppConnectionService mXmppConnectionService;
+
+	private boolean canceled = false;
+	private Account account;
+	private DownloadableFile file;
+	private Message message;
+	private URL mGetUrl;
+	private URL mPutUrl;
+
+	private byte[] key = null;
+
+	private long transmitted = 0;
+	private long expected = 1;
+
+	public HttpUploadConnection(HttpConnectionManager httpConnectionManager) {
+		this.mHttpConnectionManager = httpConnectionManager;
+		this.mXmppConnectionService = httpConnectionManager.getXmppConnectionService();
+	}
+
+	@Override
+	public boolean start() {
+		return false;
+	}
+
+	@Override
+	public int getStatus() {
+		return STATUS_UPLOADING;
+	}
+
+	@Override
+	public long getFileSize() {
+		return this.file.getExpectedSize();
+	}
+
+	@Override
+	public int getProgress() {
+		return (int) ((((double) transmitted) / expected) * 100);
+	}
+
+	@Override
+	public void cancel() {
+		this.canceled = true;
+	}
+
+	private void fail() {
+		mHttpConnectionManager.finishUploadConnection(this);
+		message.setTransferable(null);
+		mXmppConnectionService.markMessage(message,Message.STATUS_SEND_FAILED);
+	}
+
+	public void init(Message message) {
+		this.message = message;
+		message.setTransferable(this);
+		mXmppConnectionService.markMessage(message,Message.STATUS_UNSEND);
+		this.account = message.getConversation().getAccount();
+		this.file = mXmppConnectionService.getFileBackend().getFile(message, false);
+		this.file.setExpectedSize(this.file.getSize());
+
+		if (Config.ENCRYPT_ON_HTTP_UPLOADED) {
+			this.key = new byte[48];
+			mXmppConnectionService.getRNG().nextBytes(this.key);
+			this.file.setKey(this.key);
+		}
+
+		Jid host = account.getXmppConnection().findDiscoItemByFeature(Xmlns.HTTP_UPLOAD);
+		IqPacket request = mXmppConnectionService.getIqGenerator().requestHttpUploadSlot(host,file);
+		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();
+				}
+			}
+		});
+	}
+
+	private class FileUploader implements Runnable {
+
+		@Override
+		public void run() {
+			this.upload();
+		}
+
+		private void upload() {
+			OutputStream os = null;
+			InputStream is = null;
+			HttpURLConnection connection = null;
+			try {
+				Log.d(Config.LOGTAG, "uploading to " + mPutUrl.toString());
+				connection = (HttpURLConnection) mPutUrl.openConnection();
+				if (connection instanceof HttpsURLConnection) {
+					mHttpConnectionManager.setupTrustManager((HttpsURLConnection) connection, true);
+				}
+				connection.setRequestMethod("PUT");
+				connection.setFixedLengthStreamingMode((int) file.getExpectedSize());
+				connection.setDoOutput(true);
+				connection.connect();
+				os = connection.getOutputStream();
+				is = file.createInputStream();
+				transmitted = 0;
+				expected = file.getExpectedSize();
+				int count = -1;
+				byte[] buffer = new byte[4096];
+				while (((count = is.read(buffer)) != -1) && !canceled) {
+					transmitted += count;
+					os.write(buffer, 0, count);
+					mXmppConnectionService.updateConversationUi();
+				}
+				os.flush();
+				os.close();
+				is.close();
+				int code = connection.getResponseCode();
+				if (code == 200) {
+					Log.d(Config.LOGTAG, "finished uploading file");
+					Message.FileParams params = message.getFileParams();
+					if (key != null) {
+						mGetUrl = new URL(mGetUrl.toString() + "#" + CryptoHelper.bytesToHex(key));
+					}
+					mXmppConnectionService.getFileBackend().updateFileParams(message, mGetUrl);
+					message.setTransferable(null);
+					message.setCounterpart(message.getConversation().getJid().toBareJid());
+					if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
+						mXmppConnectionService.getPgpEngine().encrypt(message, new UiCallback<Message>() {
+							@Override
+							public void success(Message message) {
+								mXmppConnectionService.resendMessage(message);
+							}
+
+							@Override
+							public void error(int errorCode, Message object) {
+								fail();
+							}
+
+							@Override
+							public void userInputRequried(PendingIntent pi, Message object) {
+								fail();
+							}
+						});
+					} else {
+						mXmppConnectionService.resendMessage(message);
+					}
+				} else {
+					fail();
+				}
+			} catch (IOException e) {
+				Log.d(Config.LOGTAG, e.getMessage());
+				fail();
+			} finally {
+				FileBackend.close(is);
+				FileBackend.close(os);
+				if (connection != null) {
+					connection.disconnect();
+				}
+			}
+		}
+	}
+}
diff --git a/src/main/java/eu/siacs/conversations/parser/MessageParser.java b/src/main/java/eu/siacs/conversations/parser/MessageParser.java
index 864d0667..d46ff195 100644
--- a/src/main/java/eu/siacs/conversations/parser/MessageParser.java
+++ b/src/main/java/eu/siacs/conversations/parser/MessageParser.java
@@ -361,8 +361,8 @@ public class MessageParser extends AbstractParser implements
 				mXmppConnectionService.databaseBackend.createMessage(message);
 			}
 			final HttpConnectionManager manager = this.mXmppConnectionService.getHttpConnectionManager();
-			if (message.trusted() && message.bodyContainsDownloadable() && manager.getAutoAcceptFileSize() > 0) {
-				manager.createNewConnection(message);
+			if (message.trusted() && message.treatAsDownloadable() != Message.Decision.NEVER && manager.getAutoAcceptFileSize() > 0) {
+				manager.createNewDownloadConnection(message);
 			} else if (!message.isRead()) {
 				mXmppConnectionService.getNotificationService().push(message);
 			}
diff --git a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
index e120adbd..ee53e90e 100644
--- a/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
+++ b/src/main/java/eu/siacs/conversations/persistance/FileBackend.java
@@ -13,6 +13,7 @@ import java.security.DigestOutputStream;
 import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import java.text.SimpleDateFormat;
+import java.util.Arrays;
 import java.util.Date;
 import java.util.Locale;
 
@@ -32,6 +33,7 @@ import android.webkit.MimeTypeMap;
 
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.R;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.DownloadableFile;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.services.XmppConnectionService;
@@ -78,10 +80,10 @@ public class FileBackend {
 			if (path.startsWith("/")) {
 				return new DownloadableFile(path);
 			} else {
-				if (message.getType() == Message.TYPE_FILE) {
+				if (Arrays.asList(Transferable.VALID_IMAGE_EXTENSIONS).contains(extension)) {
 					return new DownloadableFile(getConversationsFileDirectory() + path);
 				} else {
-					return new DownloadableFile(getConversationsImageDirectory()+path);
+					return new DownloadableFile(getConversationsImageDirectory() + path);
 				}
 			}
 		}
@@ -217,7 +219,7 @@ public class FileBackend {
 			long size = file.getSize();
 			int width = scaledBitmap.getWidth();
 			int height = scaledBitmap.getHeight();
-			message.setBody(Long.toString(size) + ',' + width + ',' + height);
+			message.setBody(Long.toString(size) + '|' + width + '|' + height);
 			return file;
 		} catch (FileNotFoundException e) {
 			throw new FileCopyException(R.string.error_file_not_found);
@@ -497,7 +499,11 @@ public class FileBackend {
 				message.setBody(url.toString()+"|"+Long.toString(file.getSize()) + '|' + imageWidth + '|' + imageHeight);
 			}
 		} else {
-			message.setBody(Long.toString(file.getSize()));
+			if (url != null) {
+				message.setBody(url.toString()+"|"+Long.toString(file.getSize()));
+			} else {
+				message.setBody(Long.toString(file.getSize()));
+			}
 		}
 
 	}
diff --git a/src/main/java/eu/siacs/conversations/services/NotificationService.java b/src/main/java/eu/siacs/conversations/services/NotificationService.java
index 49543eeb..2b59e473 100644
--- a/src/main/java/eu/siacs/conversations/services/NotificationService.java
+++ b/src/main/java/eu/siacs/conversations/services/NotificationService.java
@@ -18,7 +18,6 @@ import android.support.v4.app.NotificationCompat.Builder;
 import android.support.v4.app.TaskStackBuilder;
 import android.text.Html;
 import android.util.DisplayMetrics;
-import android.util.Log;
 
 import org.json.JSONArray;
 import org.json.JSONObject;
@@ -42,7 +41,6 @@ import eu.siacs.conversations.ui.ManageAccountActivity;
 import eu.siacs.conversations.ui.TimePreference;
 import eu.siacs.conversations.utils.GeoHelper;
 import eu.siacs.conversations.utils.UIHelper;
-import eu.siacs.conversations.xmpp.XmppConnection;
 
 public class NotificationService {
 
@@ -303,7 +301,7 @@ public class NotificationService {
 			final ArrayList<Message> tmp = new ArrayList<>();
 			for (final Message msg : messages) {
 				if (msg.getType() == Message.TYPE_TEXT
-						&& msg.getDownloadable() == null) {
+						&& msg.getTransferable() == null) {
 					tmp.add(msg);
 						}
 			}
@@ -335,7 +333,7 @@ public class NotificationService {
 	private Message getImage(final Iterable<Message> messages) {
 		for (final Message message : messages) {
 			if (message.getType() == Message.TYPE_IMAGE
-					&& message.getDownloadable() == null
+					&& message.getTransferable() == null
 					&& message.getEncryption() != Message.ENCRYPTION_PGP) {
 				return message;
 					}
@@ -346,7 +344,7 @@ public class NotificationService {
 	private Message getFirstDownloadableMessage(final Iterable<Message> messages) {
 		for (final Message message : messages) {
 			if ((message.getType() == Message.TYPE_FILE || message.getType() == Message.TYPE_IMAGE) &&
-					message.getDownloadable() != null) {
+					message.getTransferable() != null) {
 				return message;
 			}
 		}
diff --git a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
index 17c344c2..2dd0f04c 100644
--- a/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
+++ b/src/main/java/eu/siacs/conversations/services/XmppConnectionService.java
@@ -28,6 +28,7 @@ import android.util.LruCache;
 import net.java.otr4j.OtrException;
 import net.java.otr4j.session.Session;
 import net.java.otr4j.session.SessionID;
+import net.java.otr4j.session.SessionImpl;
 import net.java.otr4j.session.SessionStatus;
 
 import org.openintents.openpgp.util.OpenPgpApi;
@@ -56,12 +57,11 @@ import eu.siacs.conversations.entities.Blockable;
 import eu.siacs.conversations.entities.Bookmark;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
-import eu.siacs.conversations.entities.Downloadable;
-import eu.siacs.conversations.entities.DownloadablePlaceholder;
+import eu.siacs.conversations.entities.Transferable;
+import eu.siacs.conversations.entities.TransferablePlaceholder;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.entities.MucOptions;
 import eu.siacs.conversations.entities.MucOptions.OnRenameListener;
-import eu.siacs.conversations.entities.Presences;
 import eu.siacs.conversations.generator.IqGenerator;
 import eu.siacs.conversations.generator.MessageGenerator;
 import eu.siacs.conversations.generator.PresenceGenerator;
@@ -233,6 +233,8 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 	private MessageArchiveService mMessageArchiveService = new MessageArchiveService(this);
 	private OnConversationUpdate mOnConversationUpdate = null;
 	private int convChangedListenerCount = 0;
+	private OnShowErrorToast mOnShowErrorToast = null;
+	private int showErrorToastListenerCount = 0;
 	private int unreadCount = -1;
 	private OnAccountUpdate mOnAccountUpdate = null;
 	private OnStatusChanged statusListener = new OnStatusChanged() {
@@ -390,7 +392,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 							callback.success(message);
 						}
 					} catch (FileBackend.FileCopyException e) {
-						callback.error(e.getResId(),message);
+						callback.error(e.getResId(), message);
 					}
 				}
 			});
@@ -630,7 +632,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 		Context context = getApplicationContext();
 		AlarmManager alarmManager = (AlarmManager) context
-			.getSystemService(Context.ALARM_SERVICE);
+				.getSystemService(Context.ALARM_SERVICE);
 		Intent intent = new Intent(context, EventReceiver.class);
 		alarmManager.cancel(PendingIntent.getBroadcast(context, 0, intent, 0));
 		Log.d(Config.LOGTAG, "good bye");
@@ -672,114 +674,138 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
+	private void sendFileMessage(final Message message) {
+		Log.d(Config.LOGTAG, "send file message");
+		final Account account = message.getConversation().getAccount();
+		final XmppConnection connection = account.getXmppConnection();
+		if (connection != null && connection.getFeatures().httpUpload()) {
+			mHttpConnectionManager.createNewUploadConnection(message);
+		} else {
+			mJingleConnectionManager.createNewConnection(message);
+		}
+	}
+
 	public void sendMessage(final Message message) {
+		sendMessage(message, false);
+	}
+
+	private void sendMessage(final Message message, final boolean resend) {
 		final Account account = message.getConversation().getAccount();
+		final Conversation conversation = message.getConversation();
 		account.deactivateGracePeriod();
-		final Conversation conv = message.getConversation();
 		MessagePacket packet = null;
 		boolean saveInDb = true;
-		boolean send = false;
-		if (account.getStatus() == Account.State.ONLINE
-				&& account.getXmppConnection() != null) {
-			if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE) {
-				if (message.getCounterpart() != null) {
-					if (message.getEncryption() == Message.ENCRYPTION_OTR) {
-						if (!conv.hasValidOtrSession()) {
-							conv.startOtrSession(message.getCounterpart().getResourcepart(),true);
-							message.setStatus(Message.STATUS_WAITING);
-						} else if (conv.hasValidOtrSession()
-								&& conv.getOtrSession().getSessionStatus() == SessionStatus.ENCRYPTED) {
-							mJingleConnectionManager
-								.createNewConnection(message);
-								}
+		message.setStatus(Message.STATUS_WAITING);
+
+		if (!resend && message.getEncryption() != Message.ENCRYPTION_OTR) {
+			message.getConversation().endOtrIfNeeded();
+			message.getConversation().findUnsentMessagesWithOtrEncryption(new Conversation.OnMessageFound() {
+				@Override
+				public void onMessageFound(Message message) {
+					markMessage(message,Message.STATUS_SEND_FAILED);
+				}
+			});
+		}
+
+		if (account.isOnlineAndConnected()) {
+			switch (message.getEncryption()) {
+				case Message.ENCRYPTION_NONE:
+					if (message.needsUploading()) {
+						if (account.httpUploadAvailable() || message.fixCounterpart()) {
+							this.sendFileMessage(message);
+						} else {
+							break;
+						}
 					} else {
-						mJingleConnectionManager.createNewConnection(message);
+						packet = mMessageGenerator.generateChat(message,resend);
 					}
-				} else {
-					if (message.getEncryption() == Message.ENCRYPTION_OTR) {
-						conv.startOtrIfNeeded();
-					}
-					message.setStatus(Message.STATUS_WAITING);
-				}
-			} else {
-				if (message.getEncryption() == Message.ENCRYPTION_OTR) {
-					if (!conv.hasValidOtrSession() && (message.getCounterpart() != null)) {
-						conv.startOtrSession(message.getCounterpart().getResourcepart(), true);
-						message.setStatus(Message.STATUS_WAITING);
-					} else if (conv.hasValidOtrSession()) {
-						if (conv.getOtrSession().getSessionStatus() == SessionStatus.ENCRYPTED) {
-							packet = mMessageGenerator.generateOtrChat(message);
-							send = true;
+					break;
+				case Message.ENCRYPTION_PGP:
+				case Message.ENCRYPTION_DECRYPTED:
+					if (message.needsUploading()) {
+						if (account.httpUploadAvailable() || message.fixCounterpart()) {
+							this.sendFileMessage(message);
 						} else {
-							message.setStatus(Message.STATUS_WAITING);
-							conv.startOtrIfNeeded();
+							break;
 						}
 					} else {
-						message.setStatus(Message.STATUS_WAITING);
+						packet = mMessageGenerator.generatePgpChat(message,resend);
 					}
-				} else if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
-					message.getConversation().endOtrIfNeeded();
-					message.getConversation().findUnsentMessagesWithOtrEncryption(new Conversation.OnMessageFound() {
-						@Override
-						public void onMessageFound(Message message) {
-							markMessage(message,Message.STATUS_SEND_FAILED);
+					break;
+				case Message.ENCRYPTION_OTR:
+					SessionImpl otrSession = conversation.getOtrSession();
+					if (otrSession != null && otrSession.getSessionStatus() == SessionStatus.ENCRYPTED) {
+						try {
+							message.setCounterpart(Jid.fromSessionID(otrSession.getSessionID()));
+						} catch (InvalidJidException e) {
+							break;
 						}
-					});
-					packet = mMessageGenerator.generatePgpChat(message);
-					send = true;
-				} else {
-					message.getConversation().endOtrIfNeeded();
-					message.getConversation().findUnsentMessagesWithOtrEncryption(new Conversation.OnMessageFound() {
-						@Override
-						public void onMessageFound(Message message) {
-							markMessage(message,Message.STATUS_SEND_FAILED);
+						if (message.needsUploading()) {
+							mJingleConnectionManager.createNewConnection(message);
+						} else {
+							packet = mMessageGenerator.generateOtrChat(message,resend);
 						}
-					});
-					packet = mMessageGenerator.generateChat(message);
-					send = true;
+					} else if (otrSession == null) {
+						if (message.fixCounterpart()) {
+							conversation.startOtrSession(message.getCounterpart().getResourcepart(), true);
+						} else {
+							break;
+						}
+					}
+					break;
+			}
+			if (packet != null) {
+				if (account.getXmppConnection().getFeatures().sm() || conversation.getMode() == Conversation.MODE_MULTI) {
+					message.setStatus(Message.STATUS_UNSEND);
+				} else {
+					message.setStatus(Message.STATUS_SEND);
 				}
 			}
-			if (!account.getXmppConnection().getFeatures().sm()
-					&& conv.getMode() != Conversation.MODE_MULTI) {
-				message.setStatus(Message.STATUS_SEND);
-					}
 		} else {
-			message.setStatus(Message.STATUS_WAITING);
-			if (message.getType() == Message.TYPE_TEXT) {
-				if (message.getEncryption() == Message.ENCRYPTION_DECRYPTED) {
-					String pgpBody = message.getEncryptedBody();
-					String decryptedBody = message.getBody();
-					message.setBody(pgpBody);
-					message.setEncryption(Message.ENCRYPTION_PGP);
-					databaseBackend.createMessage(message);
-					saveInDb = false;
-					message.setBody(decryptedBody);
-					message.setEncryption(Message.ENCRYPTION_DECRYPTED);
-				} else if (message.getEncryption() == Message.ENCRYPTION_OTR) {
-					if (!conv.hasValidOtrSession()
-							&& message.getCounterpart() != null) {
-						conv.startOtrSession(message.getCounterpart().getResourcepart(), false);
-							}
-				}
+			switch(message.getEncryption()) {
+				case Message.ENCRYPTION_DECRYPTED:
+					if (!message.needsUploading()) {
+						String pgpBody = message.getEncryptedBody();
+						String decryptedBody = message.getBody();
+						message.setBody(pgpBody);
+						message.setEncryption(Message.ENCRYPTION_PGP);
+						databaseBackend.createMessage(message);
+						saveInDb = false;
+						message.setBody(decryptedBody);
+						message.setEncryption(Message.ENCRYPTION_DECRYPTED);
+					}
+					break;
+				case Message.ENCRYPTION_OTR:
+					if (!conversation.hasValidOtrSession() && message.getCounterpart() != null) {
+						conversation.startOtrSession(message.getCounterpart().getResourcepart(), false);
+					}
+					break;
 			}
-
 		}
-		conv.add(message);
-		if (saveInDb) {
-			if (message.getEncryption() == Message.ENCRYPTION_NONE
-					|| saveEncryptedMessages()) {
+
+		if (resend) {
+			if (packet != null) {
+				if (account.getXmppConnection().getFeatures().sm() || conversation.getMode() == Conversation.MODE_MULTI) {
+					markMessage(message,Message.STATUS_UNSEND);
+				} else {
+					markMessage(message,Message.STATUS_SEND);
+				}
+			}
+		} else {
+			conversation.add(message);
+			if (saveInDb && (message.getEncryption() == Message.ENCRYPTION_NONE || saveEncryptedMessages())) {
 				databaseBackend.createMessage(message);
-					}
+			}
+			updateConversationUi();
 		}
-		if ((send) && (packet != null)) {
-			if (conv.setOutgoingChatState(Config.DEFAULT_CHATSTATE)) {
+		if (packet != null) {
+			if (conversation.setOutgoingChatState(Config.DEFAULT_CHATSTATE)) {
 				if (this.sendChatStates()) {
-					packet.addChild(ChatState.toElement(conv.getOutgoingChatState()));
+					packet.addChild(ChatState.toElement(conversation.getOutgoingChatState()));
 				}
 			}
 			sendMessagePacket(account, packet);
 		}
-		updateConversationUi();
 	}
 
 	private void sendUnsentMessages(final Conversation conversation) {
@@ -792,77 +818,8 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		});
 	}
 
-	private void resendMessage(final Message message) {
-		Account account = message.getConversation().getAccount();
-		MessagePacket packet = null;
-		if (message.getEncryption() == Message.ENCRYPTION_OTR) {
-			Presences presences = message.getConversation().getContact()
-				.getPresences();
-			if (!message.getConversation().hasValidOtrSession()) {
-				if ((message.getCounterpart() != null)
-						&& (presences.has(message.getCounterpart().getResourcepart()))) {
-					message.getConversation().startOtrSession(message.getCounterpart().getResourcepart(), true);
-				} else {
-					if (presences.size() == 1) {
-						String presence = presences.asStringArray()[0];
-						message.getConversation().startOtrSession(presence, true);
-					}
-				}
-			} else {
-				if (message.getConversation().getOtrSession()
-						.getSessionStatus() == SessionStatus.ENCRYPTED) {
-					try {
-						message.setCounterpart(Jid.fromSessionID(message.getConversation().getOtrSession().getSessionID()));
-						if (message.getType() == Message.TYPE_TEXT) {
-							packet = mMessageGenerator.generateOtrChat(message,
-									true);
-						} else if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE) {
-							mJingleConnectionManager.createNewConnection(message);
-						}
-					} catch (final InvalidJidException ignored) {
-
-					}
-						}
-			}
-		} else if (message.getType() == Message.TYPE_TEXT) {
-			if (message.getEncryption() == Message.ENCRYPTION_NONE) {
-				packet = mMessageGenerator.generateChat(message, true);
-			} else if ((message.getEncryption() == Message.ENCRYPTION_DECRYPTED)
-					|| (message.getEncryption() == Message.ENCRYPTION_PGP)) {
-				packet = mMessageGenerator.generatePgpChat(message, true);
-					}
-		} else if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE) {
-			Contact contact = message.getConversation().getContact();
-			Presences presences = contact.getPresences();
-			if ((message.getCounterpart() != null)
-					&& (presences.has(message.getCounterpart().getResourcepart()))) {
-				mJingleConnectionManager.createNewConnection(message);
-			} else {
-				if (presences.size() == 1) {
-					String presence = presences.asStringArray()[0];
-					try {
-						message.setCounterpart(Jid.fromParts(contact.getJid().getLocalpart(), contact.getJid().getDomainpart(), presence));
-					} catch (InvalidJidException e) {
-						return;
-					}
-					mJingleConnectionManager.createNewConnection(message);
-				}
-			}
-		}
-		if (packet != null) {
-			if (!account.getXmppConnection().getFeatures().sm()
-					&& message.getConversation().getMode() != Conversation.MODE_MULTI) {
-				markMessage(message, Message.STATUS_SEND);
-			} else {
-				markMessage(message, Message.STATUS_UNSEND);
-			}
-			if (message.getConversation().setOutgoingChatState(Config.DEFAULT_CHATSTATE)) {
-				if (this.sendChatStates()) {
-					packet.addChild(ChatState.toElement(message.getConversation().getOutgoingChatState()));
-				}
-			}
-			sendMessagePacket(account, packet);
-		}
+	public void resendMessage(final Message message) {
+		sendMessage(message, true);
 	}
 
 	public void fetchRosterFromServer(final Account account) {
@@ -1017,7 +974,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			@Override
 			public void onMessageFound(Message message) {
 				if (!getFileBackend().isFileAvailable(message)) {
-					message.setDownloadable(new DownloadablePlaceholder(Downloadable.STATUS_DELETED));
+					message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_DELETED));
 				}
 			}
 		});
@@ -1028,7 +985,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 			Message message = conversation.findMessageWithFileAndUuid(uuid);
 			if (message != null) {
 				if (!getFileBackend().isFileAvailable(message)) {
-					message.setDownloadable(new DownloadablePlaceholder(Downloadable.STATUS_DELETED));
+					message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_DELETED));
 					updateConversationUi();
 				}
 				return;
@@ -1040,13 +997,14 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		populateWithOrderedConversations(list, true);
 	}
 
-	public void populateWithOrderedConversations(final List<Conversation> list, boolean includeConferences) {
+	public void populateWithOrderedConversations(final List<Conversation> list, boolean includeNoFileUpload) {
 		list.clear();
-		if (includeConferences) {
+		if (includeNoFileUpload) {
 			list.addAll(getConversations());
 		} else {
 			for (Conversation conversation : getConversations()) {
-				if (conversation.getMode() == Conversation.MODE_SINGLE) {
+				if (conversation.getMode() == Conversation.MODE_SINGLE
+						|| conversation.getAccount().httpUploadAvailable()) {
 					list.add(conversation);
 				}
 			}
@@ -1284,6 +1242,32 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		}
 	}
 
+	public void setOnShowErrorToastListener(OnShowErrorToast onShowErrorToast) {
+		synchronized (this) {
+			if (checkListeners()) {
+				switchToForeground();
+			}
+			this.mOnShowErrorToast = onShowErrorToast;
+			if (this.showErrorToastListenerCount < 2) {
+				this.showErrorToastListenerCount++;
+			}
+		}
+		this.mOnShowErrorToast = onShowErrorToast;
+	}
+
+	public void removeOnShowErrorToastListener() {
+		synchronized (this) {
+			this.showErrorToastListenerCount--;
+			if (this.showErrorToastListenerCount <= 0) {
+				this.showErrorToastListenerCount = 0;
+				this.mOnShowErrorToast = null;
+				if (checkListeners()) {
+					switchToBackground();
+				}
+			}
+		}
+	}
+
 	public void setOnAccountListChangedListener(OnAccountUpdate listener) {
 		synchronized (this) {
 			if (checkListeners()) {
@@ -1388,7 +1372,8 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		return (this.mOnAccountUpdate == null
 				&& this.mOnConversationUpdate == null
 				&& this.mOnRosterUpdate == null
-				&& this.mOnUpdateBlocklist == null);
+				&& this.mOnUpdateBlocklist == null
+				&& this.mOnShowErrorToast == null);
 	}
 
 	private void switchToForeground() {
@@ -1810,15 +1795,15 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 				} catch (InvalidJidException e) {
 					return;
 				}
-				if (message.getType() == Message.TYPE_TEXT) {
+				if (message.needsUploading()) {
+					mJingleConnectionManager.createNewConnection(message);
+				} else {
 					MessagePacket outPacket = mMessageGenerator.generateOtrChat(message, true);
 					if (outPacket != null) {
 						message.setStatus(Message.STATUS_SEND);
 						databaseBackend.updateMessage(message);
 						sendMessagePacket(account, outPacket);
 					}
-				} else if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE) {
-					mJingleConnectionManager.createNewConnection(message);
 				}
 				updateConversationUi();
 			}
@@ -2239,6 +2224,13 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		return count;
 	}
 
+
+	public void showErrorToastInUi(int resId) {
+		if (mOnShowErrorToast != null) {
+			mOnShowErrorToast.onShowErrorToast(resId);
+		}
+	}
+
 	public void updateConversationUi() {
 		if (mOnConversationUpdate != null) {
 			mOnConversationUpdate.onConversationUpdate();
@@ -2572,6 +2564,10 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		public void onPushFailed();
 	}
 
+	public interface OnShowErrorToast {
+		void onShowErrorToast(int resId);
+	}
+
 	public class XmppConnectionBinder extends Binder {
 		public XmppConnectionService getService() {
 			return XmppConnectionService.this;
diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java b/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
index c48b5865..a507a5fe 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationActivity.java
@@ -35,10 +35,12 @@ import java.util.Iterator;
 import java.util.List;
 
 import eu.siacs.conversations.R;
+import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Blockable;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
 import eu.siacs.conversations.entities.Message;
+import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.services.XmppConnectionService.OnAccountUpdate;
 import eu.siacs.conversations.services.XmppConnectionService.OnConversationUpdate;
 import eu.siacs.conversations.services.XmppConnectionService.OnRosterUpdate;
@@ -47,7 +49,7 @@ import eu.siacs.conversations.utils.ExceptionHelper;
 import eu.siacs.conversations.xmpp.OnUpdateBlocklist;
 
 public class ConversationActivity extends XmppActivity
-	implements OnAccountUpdate, OnConversationUpdate, OnRosterUpdate, OnUpdateBlocklist {
+	implements OnAccountUpdate, OnConversationUpdate, OnRosterUpdate, OnUpdateBlocklist, XmppConnectionService.OnShowErrorToast {
 
 	public static final String ACTION_DOWNLOAD = "eu.siacs.conversations.action.DOWNLOAD";
 
@@ -382,7 +384,7 @@ public class ConversationActivity extends XmppActivity
 				}
 				if (this.getSelectedConversation().getMode() == Conversation.MODE_MULTI) {
 					menuContactDetails.setVisible(false);
-					menuAttach.setVisible(false);
+					menuAttach.setVisible(getSelectedConversation().getAccount().httpUploadAvailable());
 					menuInviteContact.setVisible(getSelectedConversation().getMucOptions().canInvite());
 				} else {
 					menuMucDetails.setVisible(false);
@@ -398,6 +400,8 @@ public class ConversationActivity extends XmppActivity
 	}
 
 	private void selectPresenceToAttachFile(final int attachmentChoice, final int encryption) {
+		final Conversation conversation = getSelectedConversation();
+		final Account account = conversation.getAccount();
 		final OnPresenceSelected callback = new OnPresenceSelected() {
 
 			@Override
@@ -449,11 +453,11 @@ public class ConversationActivity extends XmppActivity
 				}
 			}
 		};
-		if (attachmentChoice == ATTACHMENT_CHOICE_LOCATION && encryption != Message.ENCRYPTION_OTR) {
-			getSelectedConversation().setNextCounterpart(null);
+		if ((account.httpUploadAvailable() || attachmentChoice == ATTACHMENT_CHOICE_LOCATION) && encryption != Message.ENCRYPTION_OTR) {
+			conversation.setNextCounterpart(null);
 			callback.onPresenceSelected();
 		} else {
-			selectPresence(getSelectedConversation(),callback);
+			selectPresence(conversation,callback);
 		}
 	}
 
@@ -1268,4 +1272,14 @@ public class ConversationActivity extends XmppActivity
 	public boolean enterIsSend() {
 		return getPreferences().getBoolean("enter_is_send",false);
 	}
+
+	@Override
+	public void onShowErrorToast(final int resId) {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				Toast.makeText(ConversationActivity.this,resId,Toast.LENGTH_SHORT).show();
+			}
+		});
+	}
 }
diff --git a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
index a817b27b..7983fdca 100644
--- a/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
+++ b/src/main/java/eu/siacs/conversations/ui/ConversationFragment.java
@@ -34,7 +34,6 @@ import android.widget.Toast;
 
 import net.java.otr4j.session.SessionStatus;
 
-import java.net.URLConnection;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.NoSuchElementException;
@@ -46,9 +45,9 @@ import eu.siacs.conversations.crypto.PgpEngine;
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
-import eu.siacs.conversations.entities.Downloadable;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.DownloadableFile;
-import eu.siacs.conversations.entities.DownloadablePlaceholder;
+import eu.siacs.conversations.entities.TransferablePlaceholder;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.entities.MucOptions;
 import eu.siacs.conversations.entities.Presences;
@@ -437,34 +436,36 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 			MenuItem shareWith = menu.findItem(R.id.share_with);
 			MenuItem sendAgain = menu.findItem(R.id.send_again);
 			MenuItem copyUrl = menu.findItem(R.id.copy_url);
-			MenuItem downloadImage = menu.findItem(R.id.download_image);
+			MenuItem downloadFile = menu.findItem(R.id.download_file);
 			MenuItem cancelTransmission = menu.findItem(R.id.cancel_transmission);
-			if ((m.getType() != Message.TYPE_TEXT && m.getType() != Message.TYPE_PRIVATE)
-					|| m.getDownloadable() != null || GeoHelper.isGeoUri(m.getBody())) {
-				copyText.setVisible(false);
+			if ((m.getType() == Message.TYPE_TEXT || m.getType() == Message.TYPE_PRIVATE)
+					&& m.getTransferable() == null
+					&& !GeoHelper.isGeoUri(m.getBody())
+					&& m.treatAsDownloadable() != Message.Decision.MUST) {
+				copyText.setVisible(true);
 			}
-			if ((m.getType() == Message.TYPE_TEXT
-					|| m.getType() == Message.TYPE_PRIVATE
-					|| m.getDownloadable() != null)
-					&& (!GeoHelper.isGeoUri(m.getBody()))) {
-				shareWith.setVisible(false);
+			if ((m.getType() != Message.TYPE_TEXT
+					&& m.getType() != Message.TYPE_PRIVATE
+					&& m.getTransferable() == null)
+					|| (GeoHelper.isGeoUri(m.getBody()))) {
+				shareWith.setVisible(true);
 			}
-			if (m.getStatus() != Message.STATUS_SEND_FAILED) {
-				sendAgain.setVisible(false);
+			if (m.getStatus() == Message.STATUS_SEND_FAILED) {
+				sendAgain.setVisible(true);
 			}
-			if (((m.getType() != Message.TYPE_IMAGE && m.getDownloadable() == null)
-					|| m.getImageParams().url == null) && !GeoHelper.isGeoUri(m.getBody())) {
-				copyUrl.setVisible(false);
+			if (m.hasFileOnRemoteHost()
+					|| GeoHelper.isGeoUri(m.getBody())
+					|| m.treatAsDownloadable() == Message.Decision.MUST) {
+				copyUrl.setVisible(true);
 			}
-			if (m.getType() != Message.TYPE_TEXT
-					|| m.getDownloadable() != null
-					|| !m.bodyContainsDownloadable()) {
-				downloadImage.setVisible(false);
+			if (m.getType() == Message.TYPE_TEXT && m.getTransferable() == null && m.treatAsDownloadable() != Message.Decision.NEVER) {
+				downloadFile.setVisible(true);
+				downloadFile.setTitle(activity.getString(R.string.download_x_file,UIHelper.getFileDescriptionString(activity, m)));
 			}
-			if (!((m.getDownloadable() != null && !(m.getDownloadable() instanceof DownloadablePlaceholder))
+			if ((m.getTransferable() != null && !(m.getTransferable() instanceof TransferablePlaceholder))
 					|| (m.isFileOrImage() && (m.getStatus() == Message.STATUS_WAITING
-					|| m.getStatus() == Message.STATUS_OFFERED)))) {
-				cancelTransmission.setVisible(false);
+					|| m.getStatus() == Message.STATUS_OFFERED))) {
+				cancelTransmission.setVisible(true);
 			}
 		}
 	}
@@ -484,8 +485,8 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 			case R.id.copy_url:
 				copyUrl(selectedMessage);
 				return true;
-			case R.id.download_image:
-				downloadImage(selectedMessage);
+			case R.id.download_file:
+				downloadFile(selectedMessage);
 				return true;
 			case R.id.cancel_transmission:
 				cancelTransmission(selectedMessage);
@@ -506,8 +507,7 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 					activity.xmppConnectionService.getFileBackend()
 							.getJingleFileUri(message));
 			shareIntent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
-			String path = message.getRelativeFilePath();
-			String mime = path == null ? null : URLConnection.guessContentTypeFromName(path);
+			String mime = message.getMimeType();
 			if (mime == null) {
 				mime = "image/webp";
 			}
@@ -529,7 +529,7 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 			DownloadableFile file = activity.xmppConnectionService.getFileBackend().getFile(message);
 			if (!file.exists()) {
 				Toast.makeText(activity, R.string.file_deleted, Toast.LENGTH_SHORT).show();
-				message.setDownloadable(new DownloadablePlaceholder(Downloadable.STATUS_DELETED));
+				message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_DELETED));
 				return;
 			}
 		}
@@ -542,9 +542,12 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 		if (GeoHelper.isGeoUri(message.getBody())) {
 			resId = R.string.location;
 			url = message.getBody();
+		} else if (message.hasFileOnRemoteHost()) {
+			resId = R.string.file_url;
+			url = message.getFileParams().url.toString();
 		} else {
-			resId = R.string.image_url;
-			url = message.getImageParams().url.toString();
+			url = message.getBody().trim();
+			resId = R.string.file_url;
 		}
 		if (activity.copyTextToClipboard(url, resId)) {
 			Toast.makeText(activity, R.string.url_copied_to_clipboard,
@@ -552,15 +555,15 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 		}
 	}
 
-	private void downloadImage(Message message) {
+	private void downloadFile(Message message) {
 		activity.xmppConnectionService.getHttpConnectionManager()
-				.createNewConnection(message);
+				.createNewDownloadConnection(message);
 	}
 
 	private void cancelTransmission(Message message) {
-		Downloadable downloadable = message.getDownloadable();
-		if (downloadable != null) {
-			downloadable.cancel();
+		Transferable transferable = message.getTransferable();
+		if (transferable != null) {
+			transferable.cancel();
 		} else {
 			activity.xmppConnectionService.markMessage(message, Message.STATUS_SEND_FAILED);
 		}
@@ -754,7 +757,7 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 					if (message.getEncryption() == Message.ENCRYPTION_PGP
 							&& (message.getStatus() == Message.STATUS_RECEIVED || message
 							.getStatus() >= Message.STATUS_SEND)
-							&& message.getDownloadable() == null) {
+							&& message.getTransferable() == null) {
 						if (!mEncryptedMessages.contains(message)) {
 							mEncryptedMessages.add(message);
 						}
@@ -912,7 +915,8 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 		final SendButtonAction action;
 		final int status;
 		final boolean empty = this.mEditMessage == null || this.mEditMessage.getText().length() == 0;
-		if (c.getMode() == Conversation.MODE_MULTI) {
+		final boolean conference = c.getMode() == Conversation.MODE_MULTI;
+		if (conference && !c.getAccount().httpUploadAvailable()) {
 			if (empty && c.getNextCounterpart() != null) {
 				action = SendButtonAction.CANCEL;
 			} else {
@@ -920,28 +924,32 @@ public class ConversationFragment extends Fragment implements EditMessage.Keyboa
 			}
 		} else {
 			if (empty) {
-				String setting = activity.getPreferences().getString("quick_action","recent");
-				if (!setting.equals("none") && UIHelper.receivedLocationQuestion(conversation.getLatestMessage())) {
-					setting = "location";
-				} else if (setting.equals("recent")) {
-					setting = activity.getPreferences().getString("recently_used_quick_action","text");
-				}
-				switch (setting) {
-					case "photo":
-						action = SendButtonAction.TAKE_PHOTO;
-						break;
-					case "location":
-						action = SendButtonAction.SEND_LOCATION;
-						break;
-					case "voice":
-						action = SendButtonAction.RECORD_VOICE;
-						break;
-					case "picture":
-						action = SendButtonAction.CHOOSE_PICTURE;
-						break;
-					default:
-						action = SendButtonAction.TEXT;
-						break;
+				if (conference && c.getNextCounterpart() != null) {
+					action = SendButtonAction.CANCEL;
+				} else {
+					String setting = activity.getPreferences().getString("quick_action", "recent");
+					if (!setting.equals("none") && UIHelper.receivedLocationQuestion(conversation.getLatestMessage())) {
+						setting = "location";
+					} else if (setting.equals("recent")) {
+						setting = activity.getPreferences().getString("recently_used_quick_action", "text");
+					}
+					switch (setting) {
+						case "photo":
+							action = SendButtonAction.TAKE_PHOTO;
+							break;
+						case "location":
+							action = SendButtonAction.SEND_LOCATION;
+							break;
+						case "voice":
+							action = SendButtonAction.RECORD_VOICE;
+							break;
+						case "picture":
+							action = SendButtonAction.CHOOSE_PICTURE;
+							break;
+						default:
+							action = SendButtonAction.TEXT;
+							break;
+					}
 				}
 			} else {
 				action = SendButtonAction.TEXT;
diff --git a/src/main/java/eu/siacs/conversations/ui/ShareWithActivity.java b/src/main/java/eu/siacs/conversations/ui/ShareWithActivity.java
index 200a577e..351f1dfc 100644
--- a/src/main/java/eu/siacs/conversations/ui/ShareWithActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/ShareWithActivity.java
@@ -4,7 +4,6 @@ import android.app.PendingIntent;
 import android.content.Intent;
 import android.net.Uri;
 import android.os.Bundle;
-import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -13,10 +12,7 @@ import android.widget.AdapterView.OnItemClickListener;
 import android.widget.ListView;
 import android.widget.Toast;
 
-import java.io.UnsupportedEncodingException;
 import java.net.URLConnection;
-import java.net.URLDecoder;
-import java.nio.charset.UnsupportedCharsetException;
 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.List;
@@ -66,18 +62,17 @@ public class ShareWithActivity extends XmppActivity {
 		}
 	};
 
-	protected void onActivityResult(int requestCode, int resultCode,
-			final Intent data) {
+	protected void onActivityResult(int requestCode, int resultCode, final Intent data) {
 		super.onActivityResult(requestCode, resultCode, data);
 		if (requestCode == REQUEST_START_NEW_CONVERSATION
 				&& resultCode == RESULT_OK) {
 			share.contact = data.getStringExtra("contact");
 			share.account = data.getStringExtra("account");
-			Log.d(Config.LOGTAG, "contact: " + share.contact + " account:"
-					+ share.account);
 		}
-		if (xmppConnectionServiceBound && share != null
-				&& share.contact != null && share.account != null) {
+		if (xmppConnectionServiceBound
+				&& share != null
+				&& share.contact != null
+				&& share.account != null) {
 			share();
 		}
 	}
@@ -101,13 +96,8 @@ public class ShareWithActivity extends XmppActivity {
 		mListView.setOnItemClickListener(new OnItemClickListener() {
 
 			@Override
-			public void onItemClick(AdapterView<?> arg0, View arg1,
-					int position, long arg3) {
-				Conversation conversation = mConversations.get(position);
-				if (conversation.getMode() == Conversation.MODE_SINGLE
-						|| share.uris.size() == 0) {
-					share(mConversations.get(position));
-				}
+			public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3) {
+				share(mConversations.get(position));
 			}
 		});
 
@@ -123,11 +113,10 @@ public class ShareWithActivity extends XmppActivity {
 	@Override
 	public boolean onOptionsItemSelected(final MenuItem item) {
 		switch (item.getItemId()) {
-		case R.id.action_add:
-			final Intent intent = new Intent(getApplicationContext(),
-					ChooseContactActivity.class);
-			startActivityForResult(intent, REQUEST_START_NEW_CONVERSATION);
-			return true;
+			case R.id.action_add:
+				final Intent intent = new Intent(getApplicationContext(), ChooseContactActivity.class);
+				startActivityForResult(intent, REQUEST_START_NEW_CONVERSATION);
+				return true;
 		}
 		return super.onOptionsItemSelected(item);
 	}
@@ -157,7 +146,7 @@ public class ShareWithActivity extends XmppActivity {
 			this.share.uris = intent.getParcelableArrayListExtra(Intent.EXTRA_STREAM);
 		}
 		if (xmppConnectionServiceBound) {
-			xmppConnectionService.populateWithOrderedConversations(mConversations, this.share.image);
+			xmppConnectionService.populateWithOrderedConversations(mConversations, this.share.uris.size() == 0);
 		}
 
 	}
@@ -183,28 +172,28 @@ public class ShareWithActivity extends XmppActivity {
 	}
 
 	private void share() {
-        Account account;
-        try {
-            account = xmppConnectionService.findAccountByJid(Jid.fromString(share.account));
-        } catch (final InvalidJidException e) {
-            account = null;
-        }
-        if (account == null) {
+		Account account;
+		try {
+			account = xmppConnectionService.findAccountByJid(Jid.fromString(share.account));
+		} catch (final InvalidJidException e) {
+			account = null;
+		}
+		if (account == null) {
 			return;
 		}
-        final Conversation conversation;
-        try {
-            conversation = xmppConnectionService
-                    .findOrCreateConversation(account, Jid.fromString(share.contact), false);
-        } catch (final InvalidJidException e) {
-            return;
-        }
-        share(conversation);
+		final Conversation conversation;
+		try {
+			conversation = xmppConnectionService
+					.findOrCreateConversation(account, Jid.fromString(share.contact), false);
+		} catch (final InvalidJidException e) {
+			return;
+		}
+		share(conversation);
 	}
 
 	private void share(final Conversation conversation) {
 		if (share.uris.size() != 0) {
-			selectPresence(conversation, new OnPresenceSelected() {
+			OnPresenceSelected callback = new OnPresenceSelected() {
 				@Override
 				public void onPresenceSelected() {
 					if (share.image) {
@@ -227,7 +216,12 @@ public class ShareWithActivity extends XmppActivity {
 					switchToConversation(conversation, null, true);
 					finish();
 				}
-			});
+			};
+			if (conversation.getAccount().httpUploadAvailable()) {
+				callback.onPresenceSelected();
+			} else {
+				selectPresence(conversation, callback);
+			}
 		} else {
 			switchToConversation(conversation, this.share.text, true);
 			finish();
diff --git a/src/main/java/eu/siacs/conversations/ui/XmppActivity.java b/src/main/java/eu/siacs/conversations/ui/XmppActivity.java
index 934c696f..ddad1e30 100644
--- a/src/main/java/eu/siacs/conversations/ui/XmppActivity.java
+++ b/src/main/java/eu/siacs/conversations/ui/XmppActivity.java
@@ -284,6 +284,9 @@ public abstract class XmppActivity extends Activity {
 		if (this instanceof OnUpdateBlocklist) {
 			this.xmppConnectionService.setOnUpdateBlocklistListener((OnUpdateBlocklist) this);
 		}
+		if (this instanceof XmppConnectionService.OnShowErrorToast) {
+			this.xmppConnectionService.setOnShowErrorToastListener((XmppConnectionService.OnShowErrorToast) this);
+		}
 	}
 
 	protected void unregisterListeners() {
@@ -302,6 +305,9 @@ public abstract class XmppActivity extends Activity {
 		if (this instanceof OnUpdateBlocklist) {
 			this.xmppConnectionService.removeOnUpdateBlocklistListener();
 		}
+		if (this instanceof XmppConnectionService.OnShowErrorToast) {
+			this.xmppConnectionService.removeOnShowErrorToastListener();
+		}
 	}
 
 	@Override
@@ -447,14 +453,11 @@ public abstract class XmppActivity extends Activity {
 
 					@Override
 					public void success(Account account) {
-						xmppConnectionService.databaseBackend
-								.updateAccount(account);
+						xmppConnectionService.databaseBackend.updateAccount(account);
 						xmppConnectionService.sendPresence(account);
 						if (conversation != null) {
-							conversation
-									.setNextEncryption(Message.ENCRYPTION_PGP);
-							xmppConnectionService.databaseBackend
-									.updateConversation(conversation);
+							conversation.setNextEncryption(Message.ENCRYPTION_PGP);
+							xmppConnectionService.databaseBackend.updateConversation(conversation);
 						}
 					}
 
diff --git a/src/main/java/eu/siacs/conversations/ui/adapter/ConversationAdapter.java b/src/main/java/eu/siacs/conversations/ui/adapter/ConversationAdapter.java
index d5b7e4c0..bfe44326 100644
--- a/src/main/java/eu/siacs/conversations/ui/adapter/ConversationAdapter.java
+++ b/src/main/java/eu/siacs/conversations/ui/adapter/ConversationAdapter.java
@@ -3,7 +3,6 @@ package eu.siacs.conversations.ui.adapter;
 import android.content.Context;
 import android.content.res.Resources;
 import android.graphics.Bitmap;
-import android.graphics.Color;
 import android.graphics.Typeface;
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
@@ -22,7 +21,7 @@ import java.util.concurrent.RejectedExecutionException;
 
 import eu.siacs.conversations.R;
 import eu.siacs.conversations.entities.Conversation;
-import eu.siacs.conversations.entities.Downloadable;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.ui.ConversationActivity;
 import eu.siacs.conversations.ui.XmppActivity;
@@ -69,9 +68,9 @@ public class ConversationAdapter extends ArrayAdapter<Conversation> {
 			convName.setTypeface(null, Typeface.NORMAL);
 		}
 
-		if (message.getImageParams().width > 0
-				&& (message.getDownloadable() == null
-				|| message.getDownloadable().getStatus() != Downloadable.STATUS_DELETED)) {
+		if (message.getFileParams().width > 0
+				&& (message.getTransferable() == null
+				|| message.getTransferable().getStatus() != Transferable.STATUS_DELETED)) {
 			mLastMessage.setVisibility(View.GONE);
 			imagePreview.setVisibility(View.VISIBLE);
 			activity.loadBitmap(message, imagePreview);
diff --git a/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java b/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
index 29dfced2..167f3f02 100644
--- a/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
+++ b/src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java
@@ -29,10 +29,10 @@ import eu.siacs.conversations.R;
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
-import eu.siacs.conversations.entities.Downloadable;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.DownloadableFile;
 import eu.siacs.conversations.entities.Message;
-import eu.siacs.conversations.entities.Message.ImageParams;
+import eu.siacs.conversations.entities.Message.FileParams;
 import eu.siacs.conversations.ui.ConversationActivity;
 import eu.siacs.conversations.utils.GeoHelper;
 import eu.siacs.conversations.utils.UIHelper;
@@ -99,14 +99,14 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 		}
 		boolean multiReceived = message.getConversation().getMode() == Conversation.MODE_MULTI
 			&& message.getMergedStatus() <= Message.STATUS_RECEIVED;
-		if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE || message.getDownloadable() != null) {
-			ImageParams params = message.getImageParams();
+		if (message.getType() == Message.TYPE_IMAGE || message.getType() == Message.TYPE_FILE || message.getTransferable() != null) {
+			FileParams params = message.getFileParams();
 			if (params.size > (1.5 * 1024 * 1024)) {
 				filesize = params.size / (1024 * 1024)+ " MiB";
 			} else if (params.size > 0) {
 				filesize = params.size / 1024 + " KiB";
 			}
-			if (message.getDownloadable() != null && message.getDownloadable().getStatus() == Downloadable.STATUS_FAILED) {
+			if (message.getTransferable() != null && message.getTransferable().getStatus() == Transferable.STATUS_FAILED) {
 				error = true;
 			}
 		}
@@ -115,7 +115,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 				info = getContext().getString(R.string.waiting);
 				break;
 			case Message.STATUS_UNSEND:
-				Downloadable d = message.getDownloadable();
+				Transferable d = message.getTransferable();
 				if (d!=null) {
 					info = getContext().getString(R.string.sending_file,d.getProgress());
 				} else {
@@ -160,7 +160,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 				message.getMergedTimeSent());
 		if (message.getStatus() <= Message.STATUS_RECEIVED) {
 			if ((filesize != null) && (info != null)) {
-				viewHolder.time.setText(filesize + " \u00B7 " + info);
+				viewHolder.time.setText(formatedTime + " \u00B7 " + filesize +" \u00B7 " + info);
 			} else if ((filesize == null) && (info != null)) {
 				viewHolder.time.setText(formatedTime + " \u00B7 " + info);
 			} else if ((filesize != null) && (info == null)) {
@@ -339,7 +339,7 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 		}
 		viewHolder.messageBody.setVisibility(View.GONE);
 		viewHolder.image.setVisibility(View.VISIBLE);
-		ImageParams params = message.getImageParams();
+		FileParams params = message.getFileParams();
 		double target = metrics.density * 288;
 		int scalledW;
 		int scalledH;
@@ -482,19 +482,19 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 				}
 			});
 
-		final Downloadable downloadable = message.getDownloadable();
-		if (downloadable != null && downloadable.getStatus() != Downloadable.STATUS_UPLOADING) {
-			if (downloadable.getStatus() == Downloadable.STATUS_OFFER) {
+		final Transferable transferable = message.getTransferable();
+		if (transferable != null && transferable.getStatus() != Transferable.STATUS_UPLOADING) {
+			if (transferable.getStatus() == Transferable.STATUS_OFFER) {
 				displayDownloadableMessage(viewHolder,message,activity.getString(R.string.download_x_file, UIHelper.getFileDescriptionString(activity, message)));
-			} else if (downloadable.getStatus() == Downloadable.STATUS_OFFER_CHECK_FILESIZE) {
-				displayDownloadableMessage(viewHolder, message, activity.getString(R.string.check_image_filesize));
+			} else if (transferable.getStatus() == Transferable.STATUS_OFFER_CHECK_FILESIZE) {
+				displayDownloadableMessage(viewHolder, message, activity.getString(R.string.check_x_filesize, UIHelper.getFileDescriptionString(activity, message)));
 			} else {
 				displayInfoMessage(viewHolder, UIHelper.getMessagePreview(activity, message).first);
 			}
 		} else if (message.getType() == Message.TYPE_IMAGE && message.getEncryption() != Message.ENCRYPTION_PGP && message.getEncryption() != Message.ENCRYPTION_DECRYPTION_FAILED) {
 			displayImageMessage(viewHolder, message);
 		} else if (message.getType() == Message.TYPE_FILE && message.getEncryption() != Message.ENCRYPTION_PGP && message.getEncryption() != Message.ENCRYPTION_DECRYPTION_FAILED) {
-			if (message.getImageParams().width > 0) {
+			if (message.getFileParams().width > 0) {
 				displayImageMessage(viewHolder,message);
 			} else {
 				displayOpenableMessage(viewHolder, message);
@@ -521,12 +521,12 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 		} else {
 			if (GeoHelper.isGeoUri(message.getBody())) {
 				displayLocationMessage(viewHolder,message);
+			} else if (message.bodyIsHeart()) {
+				displayHeartMessage(viewHolder, message.getBody().trim());
+			} else if (message.treatAsDownloadable() == Message.Decision.MUST) {
+				displayDownloadableMessage(viewHolder, message, activity.getString(R.string.check_x_filesize, UIHelper.getFileDescriptionString(activity, message)));
 			} else {
-				if (message.bodyIsHeart()) {
-					displayHeartMessage(viewHolder, message.getBody().trim());
-				} else {
-					displayTextMessage(viewHolder, message);
-				}
+				displayTextMessage(viewHolder, message);
 			}
 		}
 
@@ -536,12 +536,14 @@ public class MessageAdapter extends ArrayAdapter<Message> {
 	}
 
 	public void startDownloadable(Message message) {
-		Downloadable downloadable = message.getDownloadable();
-		if (downloadable != null) {
-			if (!downloadable.start()) {
+		Transferable transferable = message.getTransferable();
+		if (transferable != null) {
+			if (!transferable.start()) {
 				Toast.makeText(activity, R.string.not_connected_try_again,
 						Toast.LENGTH_SHORT).show();
 			}
+		} else if (message.treatAsDownloadable() != Message.Decision.NEVER) {
+			activity.xmppConnectionService.getHttpConnectionManager().createNewDownloadConnection(message);
 		}
 	}
 
diff --git a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
index 06426340..5a47bb3c 100644
--- a/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
+++ b/src/main/java/eu/siacs/conversations/utils/DNSHelper.java
@@ -132,7 +132,7 @@ public class DNSHelper {
 		} catch (SocketTimeoutException e) {
 			bundle.putString("error", "timeout");
 		} catch (Exception e) {
-			Log.d(Config.LOGTAG,e.getMessage());
+			e.printStackTrace();
 			bundle.putString("error", "unhandled");
 		}
 		return bundle;
diff --git a/src/main/java/eu/siacs/conversations/utils/MimeUtils.java b/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
new file mode 100644
index 00000000..a9e89d1b
--- /dev/null
+++ b/src/main/java/eu/siacs/conversations/utils/MimeUtils.java
@@ -0,0 +1,487 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package eu.siacs.conversations.utils;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Properties;
+/**
+ * Utilities for dealing with MIME types.
+ * Used to implement java.net.URLConnection and android.webkit.MimeTypeMap.
+ */
+public final class MimeUtils {
+    private static final Map<String, String> mimeTypeToExtensionMap = new HashMap<String, String>();
+    private static final Map<String, String> extensionToMimeTypeMap = new HashMap<String, String>();
+    static {
+        // The following table is based on /etc/mime.types data minus
+        // chemical/* MIME types and MIME types that don't map to any
+        // file extensions. We also exclude top-level domain names to
+        // deal with cases like:
+        //
+        // mail.google.com/a/google.com
+        //
+        // and "active" MIME types (due to potential security issues).
+        // Note that this list is _not_ in alphabetical order and must not be sorted.
+        // The "most popular" extension must come first, so that it's the one returned
+        // by guessExtensionFromMimeType.
+        add("application/andrew-inset", "ez");
+        add("application/dsptype", "tsp");
+        add("application/hta", "hta");
+        add("application/mac-binhex40", "hqx");
+        add("application/mathematica", "nb");
+        add("application/msaccess", "mdb");
+        add("application/oda", "oda");
+        add("application/ogg", "ogg");
+        add("application/ogg", "oga");
+        add("application/pdf", "pdf");
+        add("application/pgp-keys", "key");
+        add("application/pgp-signature", "pgp");
+        add("application/pics-rules", "prf");
+        add("application/pkix-cert", "cer");
+        add("application/rar", "rar");
+        add("application/rdf+xml", "rdf");
+        add("application/rss+xml", "rss");
+        add("application/zip", "zip");
+        add("application/vnd.android.package-archive", "apk");
+        add("application/vnd.cinderella", "cdy");
+        add("application/vnd.ms-pki.stl", "stl");
+        add("application/vnd.oasis.opendocument.database", "odb");
+        add("application/vnd.oasis.opendocument.formula", "odf");
+        add("application/vnd.oasis.opendocument.graphics", "odg");
+        add("application/vnd.oasis.opendocument.graphics-template", "otg");
+        add("application/vnd.oasis.opendocument.image", "odi");
+        add("application/vnd.oasis.opendocument.spreadsheet", "ods");
+        add("application/vnd.oasis.opendocument.spreadsheet-template", "ots");
+        add("application/vnd.oasis.opendocument.text", "odt");
+        add("application/vnd.oasis.opendocument.text-master", "odm");
+        add("application/vnd.oasis.opendocument.text-template", "ott");
+        add("application/vnd.oasis.opendocument.text-web", "oth");
+        add("application/vnd.google-earth.kml+xml", "kml");
+        add("application/vnd.google-earth.kmz", "kmz");
+        add("application/msword", "doc");
+        add("application/msword", "dot");
+        add("application/vnd.openxmlformats-officedocument.wordprocessingml.document", "docx");
+        add("application/vnd.openxmlformats-officedocument.wordprocessingml.template", "dotx");
+        add("application/vnd.ms-excel", "xls");
+        add("application/vnd.ms-excel", "xlt");
+        add("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "xlsx");
+        add("application/vnd.openxmlformats-officedocument.spreadsheetml.template", "xltx");
+        add("application/vnd.ms-powerpoint", "ppt");
+        add("application/vnd.ms-powerpoint", "pot");
+        add("application/vnd.ms-powerpoint", "pps");
+        add("application/vnd.openxmlformats-officedocument.presentationml.presentation", "pptx");
+        add("application/vnd.openxmlformats-officedocument.presentationml.template", "potx");
+        add("application/vnd.openxmlformats-officedocument.presentationml.slideshow", "ppsx");
+        add("application/vnd.rim.cod", "cod");
+        add("application/vnd.smaf", "mmf");
+        add("application/vnd.stardivision.calc", "sdc");
+        add("application/vnd.stardivision.draw", "sda");
+        add("application/vnd.stardivision.impress", "sdd");
+        add("application/vnd.stardivision.impress", "sdp");
+        add("application/vnd.stardivision.math", "smf");
+        add("application/vnd.stardivision.writer", "sdw");
+        add("application/vnd.stardivision.writer", "vor");
+        add("application/vnd.stardivision.writer-global", "sgl");
+        add("application/vnd.sun.xml.calc", "sxc");
+        add("application/vnd.sun.xml.calc.template", "stc");
+        add("application/vnd.sun.xml.draw", "sxd");
+        add("application/vnd.sun.xml.draw.template", "std");
+        add("application/vnd.sun.xml.impress", "sxi");
+        add("application/vnd.sun.xml.impress.template", "sti");
+        add("application/vnd.sun.xml.math", "sxm");
+        add("application/vnd.sun.xml.writer", "sxw");
+        add("application/vnd.sun.xml.writer.global", "sxg");
+        add("application/vnd.sun.xml.writer.template", "stw");
+        add("application/vnd.visio", "vsd");
+        add("application/x-abiword", "abw");
+        add("application/x-apple-diskimage", "dmg");
+        add("application/x-bcpio", "bcpio");
+        add("application/x-bittorrent", "torrent");
+        add("application/x-cdf", "cdf");
+        add("application/x-cdlink", "vcd");
+        add("application/x-chess-pgn", "pgn");
+        add("application/x-cpio", "cpio");
+        add("application/x-debian-package", "deb");
+        add("application/x-debian-package", "udeb");
+        add("application/x-director", "dcr");
+        add("application/x-director", "dir");
+        add("application/x-director", "dxr");
+        add("application/x-dms", "dms");
+        add("application/x-doom", "wad");
+        add("application/x-dvi", "dvi");
+        add("application/x-font", "pfa");
+        add("application/x-font", "pfb");
+        add("application/x-font", "gsf");
+        add("application/x-font", "pcf");
+        add("application/x-font", "pcf.Z");
+        add("application/x-freemind", "mm");
+        // application/futuresplash isn't IANA, so application/x-futuresplash should come first.
+        add("application/x-futuresplash", "spl");
+        add("application/futuresplash", "spl");
+        add("application/x-gnumeric", "gnumeric");
+        add("application/x-go-sgf", "sgf");
+        add("application/x-graphing-calculator", "gcf");
+        add("application/x-gtar", "tgz");
+        add("application/x-gtar", "gtar");
+        add("application/x-gtar", "taz");
+        add("application/x-hdf", "hdf");
+        add("application/x-ica", "ica");
+        add("application/x-internet-signup", "ins");
+        add("application/x-internet-signup", "isp");
+        add("application/x-iphone", "iii");
+        add("application/x-iso9660-image", "iso");
+        add("application/x-jmol", "jmz");
+        add("application/x-kchart", "chrt");
+        add("application/x-killustrator", "kil");
+        add("application/x-koan", "skp");
+        add("application/x-koan", "skd");
+        add("application/x-koan", "skt");
+        add("application/x-koan", "skm");
+        add("application/x-kpresenter", "kpr");
+        add("application/x-kpresenter", "kpt");
+        add("application/x-kspread", "ksp");
+        add("application/x-kword", "kwd");
+        add("application/x-kword", "kwt");
+        add("application/x-latex", "latex");
+        add("application/x-lha", "lha");
+        add("application/x-lzh", "lzh");
+        add("application/x-lzx", "lzx");
+        add("application/x-maker", "frm");
+        add("application/x-maker", "maker");
+        add("application/x-maker", "frame");
+        add("application/x-maker", "fb");
+        add("application/x-maker", "book");
+        add("application/x-maker", "fbdoc");
+        add("application/x-mif", "mif");
+        add("application/x-ms-wmd", "wmd");
+        add("application/x-ms-wmz", "wmz");
+        add("application/x-msi", "msi");
+        add("application/x-ns-proxy-autoconfig", "pac");
+        add("application/x-nwc", "nwc");
+        add("application/x-object", "o");
+        add("application/x-oz-application", "oza");
+        add("application/x-pem-file", "pem");
+        add("application/x-pkcs12", "p12");
+        add("application/x-pkcs12", "pfx");
+        add("application/x-pkcs7-certreqresp", "p7r");
+        add("application/x-pkcs7-crl", "crl");
+        add("application/x-quicktimeplayer", "qtl");
+        add("application/x-shar", "shar");
+        add("application/x-shockwave-flash", "swf");
+        add("application/x-stuffit", "sit");
+        add("application/x-sv4cpio", "sv4cpio");
+        add("application/x-sv4crc", "sv4crc");
+        add("application/x-tar", "tar");
+        add("application/x-texinfo", "texinfo");
+        add("application/x-texinfo", "texi");
+        add("application/x-troff", "t");
+        add("application/x-troff", "roff");
+        add("application/x-troff-man", "man");
+        add("application/x-ustar", "ustar");
+        add("application/x-wais-source", "src");
+        add("application/x-wingz", "wz");
+        add("application/x-webarchive", "webarchive");
+        add("application/x-webarchive-xml", "webarchivexml");
+        add("application/x-x509-ca-cert", "crt");
+        add("application/x-x509-user-cert", "crt");
+        add("application/x-x509-server-cert", "crt");
+        add("application/x-xcf", "xcf");
+        add("application/x-xfig", "fig");
+        add("application/xhtml+xml", "xhtml");
+        add("audio/3gpp", "3gpp");
+        add("audio/aac", "aac");
+        add("audio/aac-adts", "aac");
+        add("audio/amr", "amr");
+        add("audio/amr-wb", "awb");
+        add("audio/basic", "snd");
+        add("audio/flac", "flac");
+        add("application/x-flac", "flac");
+        add("audio/imelody", "imy");
+        add("audio/midi", "mid");
+        add("audio/midi", "midi");
+        add("audio/midi", "ota");
+        add("audio/midi", "kar");
+        add("audio/midi", "rtttl");
+        add("audio/midi", "xmf");
+        add("audio/mobile-xmf", "mxmf");
+        // add ".mp3" first so it will be the default for guessExtensionFromMimeType
+        add("audio/mpeg", "mp3");
+        add("audio/mpeg", "mpga");
+        add("audio/mpeg", "mpega");
+        add("audio/mpeg", "mp2");
+        add("audio/mpeg", "m4a");
+        add("audio/mpegurl", "m3u");
+        add("audio/prs.sid", "sid");
+        add("audio/x-aiff", "aif");
+        add("audio/x-aiff", "aiff");
+        add("audio/x-aiff", "aifc");
+        add("audio/x-gsm", "gsm");
+        add("audio/x-matroska", "mka");
+        add("audio/x-mpegurl", "m3u");
+        add("audio/x-ms-wma", "wma");
+        add("audio/x-ms-wax", "wax");
+        add("audio/x-pn-realaudio", "ra");
+        add("audio/x-pn-realaudio", "rm");
+        add("audio/x-pn-realaudio", "ram");
+        add("audio/x-realaudio", "ra");
+        add("audio/x-scpls", "pls");
+        add("audio/x-sd2", "sd2");
+        add("audio/x-wav", "wav");
+        // image/bmp isn't IANA, so image/x-ms-bmp should come first.
+        add("image/x-ms-bmp", "bmp");
+        add("image/bmp", "bmp");
+        add("image/gif", "gif");
+        // image/ico isn't IANA, so image/x-icon should come first.
+        add("image/x-icon", "ico");
+        add("image/ico", "cur");
+        add("image/ico", "ico");
+        add("image/ief", "ief");
+        // add ".jpg" first so it will be the default for guessExtensionFromMimeType
+        add("image/jpeg", "jpg");
+        add("image/jpeg", "jpeg");
+        add("image/jpeg", "jpe");
+        add("image/pcx", "pcx");
+        add("image/png", "png");
+        add("image/svg+xml", "svg");
+        add("image/svg+xml", "svgz");
+        add("image/tiff", "tiff");
+        add("image/tiff", "tif");
+        add("image/vnd.djvu", "djvu");
+        add("image/vnd.djvu", "djv");
+        add("image/vnd.wap.wbmp", "wbmp");
+        add("image/webp", "webp");
+        add("image/x-cmu-raster", "ras");
+        add("image/x-coreldraw", "cdr");
+        add("image/x-coreldrawpattern", "pat");
+        add("image/x-coreldrawtemplate", "cdt");
+        add("image/x-corelphotopaint", "cpt");
+        add("image/x-jg", "art");
+        add("image/x-jng", "jng");
+        add("image/x-photoshop", "psd");
+        add("image/x-portable-anymap", "pnm");
+        add("image/x-portable-bitmap", "pbm");
+        add("image/x-portable-graymap", "pgm");
+        add("image/x-portable-pixmap", "ppm");
+        add("image/x-rgb", "rgb");
+        add("image/x-xbitmap", "xbm");
+        add("image/x-xpixmap", "xpm");
+        add("image/x-xwindowdump", "xwd");
+        add("model/iges", "igs");
+        add("model/iges", "iges");
+        add("model/mesh", "msh");
+        add("model/mesh", "mesh");
+        add("model/mesh", "silo");
+        add("text/calendar", "ics");
+        add("text/calendar", "icz");
+        add("text/comma-separated-values", "csv");
+        add("text/css", "css");
+        add("text/html", "htm");
+        add("text/html", "html");
+        add("text/h323", "323");
+        add("text/iuls", "uls");
+        add("text/mathml", "mml");
+        // add ".txt" first so it will be the default for guessExtensionFromMimeType
+        add("text/plain", "txt");
+        add("text/plain", "asc");
+        add("text/plain", "text");
+        add("text/plain", "diff");
+        add("text/plain", "po");     // reserve "pot" for vnd.ms-powerpoint
+        add("text/richtext", "rtx");
+        add("text/rtf", "rtf");
+        add("text/text", "phps");
+        add("text/tab-separated-values", "tsv");
+        add("text/xml", "xml");
+        add("text/x-bibtex", "bib");
+        add("text/x-boo", "boo");
+        add("text/x-c++hdr", "hpp");
+        add("text/x-c++hdr", "h++");
+        add("text/x-c++hdr", "hxx");
+        add("text/x-c++hdr", "hh");
+        add("text/x-c++src", "cpp");
+        add("text/x-c++src", "c++");
+        add("text/x-c++src", "cc");
+        add("text/x-c++src", "cxx");
+        add("text/x-chdr", "h");
+        add("text/x-component", "htc");
+        add("text/x-csh", "csh");
+        add("text/x-csrc", "c");
+        add("text/x-dsrc", "d");
+        add("text/x-haskell", "hs");
+        add("text/x-java", "java");
+        add("text/x-literate-haskell", "lhs");
+        add("text/x-moc", "moc");
+        add("text/x-pascal", "p");
+        add("text/x-pascal", "pas");
+        add("text/x-pcs-gcd", "gcd");
+        add("text/x-setext", "etx");
+        add("text/x-tcl", "tcl");
+        add("text/x-tex", "tex");
+        add("text/x-tex", "ltx");
+        add("text/x-tex", "sty");
+        add("text/x-tex", "cls");
+        add("text/x-vcalendar", "vcs");
+        add("text/x-vcard", "vcf");
+        add("video/3gpp", "3gpp");
+        add("video/3gpp", "3gp");
+        add("video/3gpp2", "3gpp2");
+        add("video/3gpp2", "3g2");
+        add("video/avi", "avi");
+        add("video/dl", "dl");
+        add("video/dv", "dif");
+        add("video/dv", "dv");
+        add("video/fli", "fli");
+        add("video/m4v", "m4v");
+        add("video/mp2ts", "ts");
+        add("video/mpeg", "mpeg");
+        add("video/mpeg", "mpg");
+        add("video/mpeg", "mpe");
+        add("video/mp4", "mp4");
+        add("video/mpeg", "VOB");
+        add("video/quicktime", "qt");
+        add("video/quicktime", "mov");
+        add("video/vnd.mpegurl", "mxu");
+        add("video/webm", "webm");
+        add("video/x-la-asf", "lsf");
+        add("video/x-la-asf", "lsx");
+        add("video/x-matroska", "mkv");
+        add("video/x-mng", "mng");
+        add("video/x-ms-asf", "asf");
+        add("video/x-ms-asf", "asx");
+        add("video/x-ms-wm", "wm");
+        add("video/x-ms-wmv", "wmv");
+        add("video/x-ms-wmx", "wmx");
+        add("video/x-ms-wvx", "wvx");
+        add("video/x-sgi-movie", "movie");
+        add("video/x-webex", "wrf");
+        add("x-conference/x-cooltalk", "ice");
+        add("x-epoc/x-sisx-app", "sisx");
+        applyOverrides();
+    }
+    private static void add(String mimeType, String extension) {
+        // If we have an existing x -> y mapping, we do not want to
+        // override it with another mapping x -> y2.
+        // If a mime type maps to several extensions
+        // the first extension added is considered the most popular
+        // so we do not want to overwrite it later.
+        if (!mimeTypeToExtensionMap.containsKey(mimeType)) {
+            mimeTypeToExtensionMap.put(mimeType, extension);
+        }
+        if (!extensionToMimeTypeMap.containsKey(extension)) {
+            extensionToMimeTypeMap.put(extension, mimeType);
+        }
+    }
+    private static InputStream getContentTypesPropertiesStream() {
+        // User override?
+        String userTable = System.getProperty("content.types.user.table");
+        if (userTable != null) {
+            File f = new File(userTable);
+            if (f.exists()) {
+                try {
+                    return new FileInputStream(f);
+                } catch (IOException ignored) {
+                }
+            }
+        }
+        // Standard location?
+        File f = new File(System.getProperty("java.home"), "lib" + File.separator + "content-types.properties");
+        if (f.exists()) {
+            try {
+                return new FileInputStream(f);
+            } catch (IOException ignored) {
+            }
+        }
+        return null;
+    }
+    /**
+     * This isn't what the RI does. The RI doesn't have hard-coded defaults, so supplying your
+     * own "content.types.user.table" means you don't get any of the built-ins, and the built-ins
+     * come from "$JAVA_HOME/lib/content-types.properties".
+     */
+    private static void applyOverrides() {
+        // Get the appropriate InputStream to read overrides from, if any.
+        InputStream stream = getContentTypesPropertiesStream();
+        if (stream == null) {
+            return;
+        }
+        try {
+            try {
+                // Read the properties file...
+                Properties overrides = new Properties();
+                overrides.load(stream);
+                // And translate its mapping to ours...
+                for (Map.Entry<Object, Object> entry : overrides.entrySet()) {
+                    String extension = (String) entry.getKey();
+                    String mimeType = (String) entry.getValue();
+                    add(mimeType, extension);
+                }
+            } finally {
+                stream.close();
+            }
+        } catch (IOException ignored) {
+        }
+    }
+    private MimeUtils() {
+    }
+    /**
+     * Returns true if the given MIME type has an entry in the map.
+     * @param mimeType A MIME type (i.e. text/plain)
+     * @return True iff there is a mimeType entry in the map.
+     */
+    public static boolean hasMimeType(String mimeType) {
+        if (mimeType == null || mimeType.isEmpty()) {
+            return false;
+        }
+        return mimeTypeToExtensionMap.containsKey(mimeType);
+    }
+    /**
+     * Returns the MIME type for the given extension.
+     * @param extension A file extension without the leading '.'
+     * @return The MIME type for the given extension or null iff there is none.
+     */
+    public static String guessMimeTypeFromExtension(String extension) {
+        if (extension == null || extension.isEmpty()) {
+            return null;
+        }
+        return extensionToMimeTypeMap.get(extension);
+    }
+    /**
+     * Returns true if the given extension has a registered MIME type.
+     * @param extension A file extension without the leading '.'
+     * @return True iff there is an extension entry in the map.
+     */
+    public static boolean hasExtension(String extension) {
+        if (extension == null || extension.isEmpty()) {
+            return false;
+        }
+        return extensionToMimeTypeMap.containsKey(extension);
+    }
+    /**
+     * Returns the registered extension for the given MIME type. Note that some
+     * MIME types map to multiple extensions. This call will return the most
+     * common extension for the given MIME type.
+     * @param mimeType A MIME type (i.e. text/plain)
+     * @return The extension for the given MIME type or null iff there is none.
+     */
+    public static String guessExtensionFromMimeType(String mimeType) {
+        if (mimeType == null || mimeType.isEmpty()) {
+            return null;
+        }
+        return mimeTypeToExtensionMap.get(mimeType);
+    }
+}
diff --git a/src/main/java/eu/siacs/conversations/utils/UIHelper.java b/src/main/java/eu/siacs/conversations/utils/UIHelper.java
index 2f96a83a..8047993a 100644
--- a/src/main/java/eu/siacs/conversations/utils/UIHelper.java
+++ b/src/main/java/eu/siacs/conversations/utils/UIHelper.java
@@ -1,6 +1,5 @@
 package eu.siacs.conversations.utils;
 
-import java.net.URLConnection;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Calendar;
@@ -10,7 +9,7 @@ import java.util.Locale;
 import eu.siacs.conversations.R;
 import eu.siacs.conversations.entities.Contact;
 import eu.siacs.conversations.entities.Conversation;
-import eu.siacs.conversations.entities.Downloadable;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.xmpp.jid.Jid;
 
@@ -142,24 +141,24 @@ public class UIHelper {
 	}
 
 	public static Pair<String,Boolean> getMessagePreview(final Context context, final Message message) {
-		final Downloadable d = message.getDownloadable();
+		final Transferable d = message.getTransferable();
 		if (d != null ) {
 			switch (d.getStatus()) {
-				case Downloadable.STATUS_CHECKING:
+				case Transferable.STATUS_CHECKING:
 					return new Pair<>(context.getString(R.string.checking_image),true);
-				case Downloadable.STATUS_DOWNLOADING:
+				case Transferable.STATUS_DOWNLOADING:
 					return new Pair<>(context.getString(R.string.receiving_x_file,
 									getFileDescriptionString(context,message),
 									d.getProgress()),true);
-				case Downloadable.STATUS_OFFER:
-				case Downloadable.STATUS_OFFER_CHECK_FILESIZE:
+				case Transferable.STATUS_OFFER:
+				case Transferable.STATUS_OFFER_CHECK_FILESIZE:
 					return new Pair<>(context.getString(R.string.x_file_offered_for_download,
 									getFileDescriptionString(context,message)),true);
-				case Downloadable.STATUS_DELETED:
+				case Transferable.STATUS_DELETED:
 					return new Pair<>(context.getString(R.string.file_deleted),true);
-				case Downloadable.STATUS_FAILED:
+				case Transferable.STATUS_FAILED:
 					return new Pair<>(context.getString(R.string.file_transmission_failed),true);
-				case Downloadable.STATUS_UPLOADING:
+				case Transferable.STATUS_UPLOADING:
 					if (message.getStatus() == Message.STATUS_OFFERED) {
 						return new Pair<>(context.getString(R.string.offering_x_file,
 								getFileDescriptionString(context, message)), true);
@@ -199,16 +198,7 @@ public class UIHelper {
 		if (message.getType() == Message.TYPE_IMAGE) {
 			return context.getString(R.string.image);
 		}
-		final String path = message.getRelativeFilePath();
-		if (path == null) {
-			return "";
-		}
-		final String mime;
-		try {
-			mime = URLConnection.guessContentTypeFromName(path.replace("#",""));
-		} catch (final StringIndexOutOfBoundsException ignored) {
-			return context.getString(R.string.file);
-		}
+		final String mime = message.getMimeType();
 		if (mime == null) {
 			return context.getString(R.string.file);
 		} else if (mime.startsWith("audio/")) {
@@ -230,10 +220,14 @@ public class UIHelper {
 
 	public static String getMessageDisplayName(final Message message) {
 		if (message.getStatus() == Message.STATUS_RECEIVED) {
+			final Contact contact = message.getContact();
 			if (message.getConversation().getMode() == Conversation.MODE_MULTI) {
-				return getDisplayedMucCounterpart(message.getCounterpart());
+				if (contact != null) {
+					return contact.getDisplayName();
+				} else {
+					return getDisplayedMucCounterpart(message.getCounterpart());
+				}
 			} else {
-				final Contact contact = message.getContact();
 				return contact != null ? contact.getDisplayName() : "";
 			}
 		} else {
diff --git a/src/main/java/eu/siacs/conversations/utils/Xmlns.java b/src/main/java/eu/siacs/conversations/utils/Xmlns.java
index 17fd2d26..868566d9 100644
--- a/src/main/java/eu/siacs/conversations/utils/Xmlns.java
+++ b/src/main/java/eu/siacs/conversations/utils/Xmlns.java
@@ -5,4 +5,5 @@ public final class Xmlns {
 	public static final String ROSTER = "jabber:iq:roster";
 	public static final String REGISTER = "jabber:iq:register";
 	public static final String BYTE_STREAMS = "http://jabber.org/protocol/bytestreams";
+	public static final String HTTP_UPLOAD = "eu:siacs:conversations:http:upload";
 }
diff --git a/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
index 8a438906..35c89b45 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/XmppConnection.java
@@ -366,17 +366,21 @@ public class XmppConnection implements Runnable {
 							} else if (nextTag.isStart("a")) {
 								final Element ack = tagReader.readElement(nextTag);
 								lastPacketReceived = SystemClock.elapsedRealtime();
-								final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
-								if (Config.EXTENDED_SM_LOGGING) {
-									Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + serverSequence);
-								}
-								final String msgId = this.messageReceipts.get(serverSequence);
-								if (msgId != null) {
-									if (this.acknowledgedListener != null) {
-										this.acknowledgedListener.onMessageAcknowledged(
-												account, msgId);
+								try {
+									final int serverSequence = Integer.parseInt(ack.getAttribute("h"));
+									if (Config.EXTENDED_SM_LOGGING) {
+										Log.d(Config.LOGTAG, account.getJid().toBareJid() + ": server acknowledged stanza #" + serverSequence);
 									}
-									this.messageReceipts.remove(serverSequence);
+									final String msgId = this.messageReceipts.get(serverSequence);
+									if (msgId != null) {
+										if (this.acknowledgedListener != null) {
+											this.acknowledgedListener.onMessageAcknowledged(
+													account, msgId);
+										}
+										this.messageReceipts.remove(serverSequence);
+									}
+								} catch (NumberFormatException e) {
+									Log.d(Config.LOGTAG,account.getJid().toBareJid()+": server send ack without sequence number");
 								}
 							} else if (nextTag.isStart("failed")) {
 								tagReader.readElement(nextTag);
@@ -1025,18 +1029,18 @@ public class XmppConnection implements Runnable {
 		this.streamId = null;
 	}
 
-	public List<String> findDiscoItemsByFeature(final String feature) {
-		final List<String> items = new ArrayList<>();
+	public List<Jid> findDiscoItemsByFeature(final String feature) {
+		final List<Jid> items = new ArrayList<>();
 		for (final Entry<Jid, Info> cursor : disco.entrySet()) {
 			if (cursor.getValue().features.contains(feature)) {
-				items.add(cursor.getKey().toString());
+				items.add(cursor.getKey());
 			}
 		}
 		return items;
 	}
 
-	public String findDiscoItemByFeature(final String feature) {
-		final List<String> items = findDiscoItemsByFeature(feature);
+	public Jid findDiscoItemByFeature(final String feature) {
+		final List<Jid> items = findDiscoItemsByFeature(feature);
 		if (items.size() >= 1) {
 			return items.get(0);
 		}
@@ -1191,6 +1195,10 @@ public class XmppConnection implements Runnable {
 		public void setBlockListRequested(boolean value) {
 			this.blockListRequested = value;
 		}
+
+		public boolean httpUpload() {
+			return findDiscoItemsByFeature(Xmlns.HTTP_UPLOAD).size() > 0;
+		}
 	}
 
 	private IqGenerator getIqGenerator() {
diff --git a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java
index c9bb9c93..33534724 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java
@@ -1,6 +1,5 @@
 package eu.siacs.conversations.xmpp.jingle;
 
-import java.net.URLConnection;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Iterator;
@@ -16,9 +15,9 @@ import android.util.Log;
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.entities.Account;
 import eu.siacs.conversations.entities.Conversation;
-import eu.siacs.conversations.entities.Downloadable;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.DownloadableFile;
-import eu.siacs.conversations.entities.DownloadablePlaceholder;
+import eu.siacs.conversations.entities.TransferablePlaceholder;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.xml.Element;
@@ -29,7 +28,7 @@ import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
 import eu.siacs.conversations.xmpp.jingle.stanzas.Reason;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
 
-public class JingleConnection implements Downloadable {
+public class JingleConnection implements Transferable {
 
 	private JingleConnectionManager mJingleConnectionManager;
 	private XmppConnectionService mXmppConnectionService;
@@ -43,7 +42,7 @@ public class JingleConnection implements Downloadable {
 	private int ibbBlockSize = 4096;
 
 	private int mJingleStatus = -1;
-	private int mStatus = Downloadable.STATUS_UNKNOWN;
+	private int mStatus = Transferable.STATUS_UNKNOWN;
 	private Message message;
 	private String sessionId;
 	private Account account;
@@ -199,8 +198,8 @@ public class JingleConnection implements Downloadable {
 		this.contentCreator = "initiator";
 		this.contentName = this.mJingleConnectionManager.nextRandomId();
 		this.message = message;
-		this.message.setDownloadable(this);
-		this.mStatus = Downloadable.STATUS_UPLOADING;
+		this.message.setTransferable(this);
+		this.mStatus = Transferable.STATUS_UPLOADING;
 		this.account = message.getConversation().getAccount();
 		this.initiator = this.account.getJid();
 		this.responder = this.message.getCounterpart();
@@ -256,8 +255,8 @@ public class JingleConnection implements Downloadable {
 						packet.getFrom().toBareJid(), false);
 		this.message = new Message(conversation, "", Message.ENCRYPTION_NONE);
 		this.message.setStatus(Message.STATUS_RECEIVED);
-		this.mStatus = Downloadable.STATUS_OFFER;
-		this.message.setDownloadable(this);
+		this.mStatus = Transferable.STATUS_OFFER;
+		this.message.setTransferable(this);
         final Jid from = packet.getFrom();
 		this.message.setCounterpart(from);
 		this.account = account;
@@ -408,7 +407,7 @@ public class JingleConnection implements Downloadable {
 
 	private void sendAccept() {
 		mJingleStatus = JINGLE_STATUS_ACCEPTED;
-		this.mStatus = Downloadable.STATUS_DOWNLOADING;
+		this.mStatus = Transferable.STATUS_DOWNLOADING;
 		mXmppConnectionService.updateConversationUi();
 		this.mJingleConnectionManager.getPrimaryCandidate(this.account, new OnPrimaryCandidateFound() {
 			@Override
@@ -639,7 +638,7 @@ public class JingleConnection implements Downloadable {
 		this.disconnectSocks5Connections();
 		this.mJingleStatus = JINGLE_STATUS_FINISHED;
 		this.message.setStatus(Message.STATUS_RECEIVED);
-		this.message.setDownloadable(null);
+		this.message.setTransferable(null);
 		this.mXmppConnectionService.updateMessage(message);
 		this.mJingleConnectionManager.finishConnection(this);
 	}
@@ -716,7 +715,7 @@ public class JingleConnection implements Downloadable {
 		if (this.transport != null && this.transport instanceof JingleInbandTransport) {
 			this.transport.disconnect();
 		}
-		this.message.setDownloadable(null);
+		this.message.setTransferable(null);
 		this.mJingleConnectionManager.finishConnection(this);
 	}
 
@@ -728,7 +727,7 @@ public class JingleConnection implements Downloadable {
 		this.sendCancel();
 		this.mJingleConnectionManager.finishConnection(this);
 		if (this.responder.equals(account.getJid())) {
-			this.message.setDownloadable(new DownloadablePlaceholder(Downloadable.STATUS_FAILED));
+			this.message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_FAILED));
 			if (this.file!=null) {
 				file.delete();
 			}
@@ -736,7 +735,7 @@ public class JingleConnection implements Downloadable {
 		} else {
 			this.mXmppConnectionService.markMessage(this.message,
 					Message.STATUS_SEND_FAILED);
-			this.message.setDownloadable(null);
+			this.message.setTransferable(null);
 		}
 	}
 
@@ -748,7 +747,7 @@ public class JingleConnection implements Downloadable {
 		}
 		if (this.message != null) {
 			if (this.responder.equals(account.getJid())) {
-				this.message.setDownloadable(new DownloadablePlaceholder(Downloadable.STATUS_FAILED));
+				this.message.setTransferable(new TransferablePlaceholder(Transferable.STATUS_FAILED));
 				if (this.file!=null) {
 					file.delete();
 				}
@@ -756,7 +755,7 @@ public class JingleConnection implements Downloadable {
 			} else {
 				this.mXmppConnectionService.markMessage(this.message,
 						Message.STATUS_SEND_FAILED);
-				this.message.setDownloadable(null);
+				this.message.setTransferable(null);
 			}
 		}
 		this.mJingleConnectionManager.finishConnection(this);
@@ -954,24 +953,4 @@ public class JingleConnection implements Downloadable {
 	public int getProgress() {
 		return this.mProgress;
 	}
-
-	@Override
-	public String getMimeType() {
-		if (this.message.getType() == Message.TYPE_FILE) {
-			String mime = null;
-			String path = this.message.getRelativeFilePath();
-			if (path != null && !this.message.getRelativeFilePath().isEmpty()) {
-				mime = URLConnection.guessContentTypeFromName(this.message.getRelativeFilePath());
-				if (mime!=null) {
-					return  mime;
-				} else {
-					return "";
-				}
-			} else {
-				return "";
-			}
-		} else {
-			return "image/webp";
-		}
-	}
 }
diff --git a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java
index c19dd04c..cadf9df3 100644
--- a/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java
+++ b/src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnectionManager.java
@@ -9,14 +9,13 @@ import android.annotation.SuppressLint;
 import android.util.Log;
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.entities.Account;
-import eu.siacs.conversations.entities.Downloadable;
+import eu.siacs.conversations.entities.Transferable;
 import eu.siacs.conversations.entities.Message;
 import eu.siacs.conversations.services.AbstractConnectionManager;
 import eu.siacs.conversations.services.XmppConnectionService;
 import eu.siacs.conversations.utils.Xmlns;
 import eu.siacs.conversations.xml.Element;
 import eu.siacs.conversations.xmpp.OnIqPacketReceived;
-import eu.siacs.conversations.xmpp.jid.InvalidJidException;
 import eu.siacs.conversations.xmpp.jid.Jid;
 import eu.siacs.conversations.xmpp.jingle.stanzas.JinglePacket;
 import eu.siacs.conversations.xmpp.stanzas.IqPacket;
@@ -59,7 +58,7 @@ public class JingleConnectionManager extends AbstractConnectionManager {
 	}
 
 	public JingleConnection createNewConnection(Message message) {
-		Downloadable old = message.getDownloadable();
+		Transferable old = message.getTransferable();
 		if (old != null) {
 			old.cancel();
 		}
@@ -87,10 +86,10 @@ public class JingleConnectionManager extends AbstractConnectionManager {
 			return;
 		}
 		if (!this.primaryCandidates.containsKey(account.getJid().toBareJid())) {
-			final String proxy = account.getXmppConnection().findDiscoItemByFeature(Xmlns.BYTE_STREAMS);
+			final Jid proxy = account.getXmppConnection().findDiscoItemByFeature(Xmlns.BYTE_STREAMS);
 			if (proxy != null) {
 				IqPacket iq = new IqPacket(IqPacket.TYPE.GET);
-				iq.setAttribute("to", proxy);
+				iq.setTo(proxy);
 				iq.query(Xmlns.BYTE_STREAMS);
 				account.getXmppConnection().sendIqPacket(iq,new OnIqPacketReceived() {
 
@@ -105,11 +104,11 @@ public class JingleConnectionManager extends AbstractConnectionManager {
 								candidate.setHost(host);
 								candidate.setPort(Integer.parseInt(port));
 								candidate.setType(JingleCandidate.TYPE_PROXY);
-								candidate.setJid(Jid.fromString(proxy));
+								candidate.setJid(proxy);
 								candidate.setPriority(655360 + 65535);
 								primaryCandidates.put(account.getJid().toBareJid(),candidate);
 								listener.onPrimaryCandidateFound(true,candidate);
-							} catch (final NumberFormatException | InvalidJidException e) {
+							} catch (final NumberFormatException e) {
 								listener.onPrimaryCandidateFound(false,null);
 								return;
 							}