don't automatically download files and avatars when datasaver is on

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

@@ -183,7 +183,9 @@ public class HttpDownloadConnection implements Transferable {
 				return;
 			}
 			file.setExpectedSize(size);
-			if (mHttpConnectionManager.hasStoragePermission() && size <= mHttpConnectionManager.getAutoAcceptFileSize()) {
+			if (mHttpConnectionManager.hasStoragePermission()
+					&& size <= mHttpConnectionManager.getAutoAcceptFileSize()
+					&& mXmppConnectionService.isDataSaverDisabled()) {
 				HttpDownloadConnection.this.acceptedAutomatically = true;
 				new Thread(new FileDownloader(interactive)).start();
 			} else {

src/main/java/eu/siacs/conversations/parser/MessageParser.java

@@ -238,7 +238,7 @@ public class MessageParser extends AbstractParser implements OnMessagePacketRece
 						mXmppConnectionService.updateConversationUi();
 						mXmppConnectionService.updateRosterUi();
 					}
-				} else {
+				} else if (mXmppConnectionService.isDataSaverDisabled()) {
 					mXmppConnectionService.fetchAvatar(account, avatar);
 				}
 			}

src/main/java/eu/siacs/conversations/parser/PresenceParser.java

@@ -105,7 +105,7 @@ public class PresenceParser extends AbstractParser implements
 								if (user.setAvatar(avatar)) {
 									mXmppConnectionService.getAvatarService().clear(user);
 								}
-							} else {
+							} else if (mXmppConnectionService.isDataSaverDisabled()) {
 								mXmppConnectionService.fetchAvatar(mucOptions.getAccount(), avatar);
 							}
 						}
@@ -192,7 +192,7 @@ public class PresenceParser extends AbstractParser implements
 						mXmppConnectionService.updateConversationUi();
 						mXmppConnectionService.updateRosterUi();
 					}
-				} else {
+				} else if (mXmppConnectionService.isDataSaverDisabled()){
 					mXmppConnectionService.fetchAvatar(account, avatar);
 				}
 			}

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

@@ -697,6 +697,16 @@ public class XmppConnectionService extends Service {
 		return START_STICKY;
 	}
 
+	public boolean isDataSaverDisabled() {
+		if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
+			ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE);
+			return !connectivityManager.isActiveNetworkMetered()
+					|| connectivityManager.getRestrictBackgroundStatus() == ConnectivityManager.RESTRICT_BACKGROUND_STATUS_DISABLED;
+		} else {
+			return true;
+		}
+	}
+
 	private void directReply(Conversation conversation, String body) {
 		Message message = new Message(conversation,body,conversation.getNextEncryption());
 		message.markUnread();

src/main/java/eu/siacs/conversations/xmpp/jingle/JingleConnection.java

@@ -389,7 +389,8 @@ public class JingleConnection implements Transferable {
 				conversation.add(message);
 				mXmppConnectionService.updateConversationUi();
 				if (mJingleConnectionManager.hasStoragePermission()
-						&& size < this.mJingleConnectionManager.getAutoAcceptFileSize()) {
+						&& size < this.mJingleConnectionManager.getAutoAcceptFileSize()
+						&& mXmppConnectionService.isDataSaverDisabled()) {
 					Log.d(Config.LOGTAG, "auto accepting file from "+ packet.getFrom());
 					this.acceptedAutomatically = true;
 					this.sendAccept();