show attach button in conferences when http upload is available

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,

src/main/java/eu/siacs/conversations/http/HttpUploadConnection.java

@@ -145,6 +145,7 @@ public class HttpUploadConnection implements Downloadable {
 					Message.ImageParams params = message.getImageParams();
 					message.setBody(mGetUrl.toString()+"|"+String.valueOf(params.size)+"|"+String.valueOf(params.width)+"|"+String.valueOf(params.height));
 					message.setDownloadable(null);
+					message.setCounterpart(message.getConversation().getJid().toBareJid());
 					mXmppConnectionService.resendMessage(message);
 				} else {
 					fail();

src/main/java/eu/siacs/conversations/services/XmppConnectionService.java

@@ -692,7 +692,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		if (account.getStatus() == Account.State.ONLINE
 				&& account.getXmppConnection() != null) {
 			if (message.needsUploading()) {
-				if (message.getCounterpart() != null) {
+				if (message.getCounterpart() != null || account.httpUploadAvailable()) {
 					if (message.getEncryption() == Message.ENCRYPTION_OTR) {
 						if (!conv.hasValidOtrSession()) {
 							conv.startOtrSession(message.getCounterpart().getResourcepart(),true);
@@ -834,8 +834,7 @@ public class XmppConnectionService extends Service implements OnPhoneContactsLoa
 		} else if (message.needsUploading()) {
 			Contact contact = message.getConversation().getContact();
 			Presences presences = contact.getPresences();
-			if ((message.getCounterpart() != null)
+			if (account.httpUploadAvailable() || (message.getCounterpart() != null && presences.has(message.getCounterpart().getResourcepart()))) {
-					&& (presences.has(message.getCounterpart().getResourcepart()))) {
 				this.sendFileMessage(message);
 			} else {
 				if (presences.size() == 1) {

src/main/java/eu/siacs/conversations/ui/ConversationActivity.java

@@ -35,6 +35,7 @@ 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;
@@ -382,7 +383,7 @@ 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 +399,8 @@ 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 +452,11 @@ public class ConversationActivity extends XmppActivity
 				}
 			}
 		};
-		if (attachmentChoice == ATTACHMENT_CHOICE_LOCATION && encryption != Message.ENCRYPTION_OTR) {
+		if ((account.httpUploadAvailable() || attachmentChoice == ATTACHMENT_CHOICE_LOCATION) && encryption != Message.ENCRYPTION_OTR) {
-			getSelectedConversation().setNextCounterpart(null);
+			conversation.setNextCounterpart(null);
 			callback.onPresenceSelected();
 		} else {
-			selectPresence(getSelectedConversation(),callback);
+			selectPresence(conversation,callback);
 		}
 	}