show file too large instead of generic delivery failed

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

@@ -1,8 +1,11 @@
 package eu.siacs.conversations.parser;
 
+
 import java.text.ParseException;
 import java.text.SimpleDateFormat;
 
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Locale;
 
 import eu.siacs.conversations.entities.Account;
@@ -127,14 +130,36 @@ public abstract class AbstractParser {
 	public static String extractErrorMessage(Element packet) {
 		final Element error = packet.findChild("error");
 		if (error != null && error.getChildren().size() > 0) {
+			final List<String> errorNames = orderedElementNames(error.getChildren());
 			final String text = error.findChildContent("text");
 			if (text != null && !text.trim().isEmpty()) {
-				return text;
-			} else {
-				return error.getChildren().get(0).getName().replace("-"," ");
+				return prefixError(errorNames)+text;
+			} else if (errorNames.size() > 0){
+				return prefixError(errorNames)+errorNames.get(0).replace("-"," ");
 			}
-		} else {
-			return null;
 		}
+		return null;
+	}
+
+	private static String prefixError(List<String> errorNames) {
+		if (errorNames.size() > 0) {
+			return errorNames.get(0)+'\u001f';
+		}
+		return "";
+	}
+
+	private static List<String> orderedElementNames(List<Element> children) {
+		List<String> names = new ArrayList<>();
+		for(Element child : children) {
+			final String name = child.getName();
+			if (name != null && !name.equals("text")) {
+				if ("urn:ietf:params:xml:ns:xmpp-stanzas".equals(child.getNamespace())) {
+					names.add(name);
+				} else {
+					names.add(0, name);
+				}
+			}
+		}
+		return names;
 	}
 }

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

@@ -1624,9 +1624,17 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
     private void showErrorMessage(final Message message) {
         AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
         builder.setTitle(R.string.error_message);
-        builder.setMessage(message.getErrorMessage());
+        final String errorMessage = message.getErrorMessage();
+        final String[] errorMessageParts = errorMessage == null ? new String[0] : errorMessage.split("\\u001f");
+        final String displayError;
+        if (errorMessageParts.length == 2) {
+            displayError = errorMessageParts[1];
+        } else {
+            displayError = errorMessage;
+        }
+        builder.setMessage(displayError);
         builder.setNegativeButton(R.string.copy_to_clipboard, (dialog, which) -> {
-            activity.copyTextToClipboard(message.getErrorMessage(),R.string.error_message);
+            activity.copyTextToClipboard(displayError,R.string.error_message);
             Toast.makeText(activity,R.string.error_message_copied_to_clipboard, Toast.LENGTH_SHORT).show();
         });
         builder.setPositiveButton(R.string.confirm, null);

src/main/java/eu/siacs/conversations/ui/adapter/MessageAdapter.java

@@ -219,10 +219,23 @@ public class MessageAdapter extends ArrayAdapter<Message> implements CopyTextVie
 				}
 				break;
 			case Message.STATUS_SEND_FAILED:
-				if (Message.ERROR_MESSAGE_CANCELLED.equals(message.getErrorMessage())) {
+				final String errorMessage = message.getErrorMessage();
+				if (Message.ERROR_MESSAGE_CANCELLED.equals(errorMessage)) {
 					info = getContext().getString(R.string.cancelled);
 				} else {
-					info = getContext().getString(R.string.send_failed);
+					final String[] errorParts = errorMessage.split("\\u001f", 2);
+					if (errorParts.length == 2) {
+						switch (errorParts[0]) {
+							case "file-too-large":
+								info = getContext().getString(R.string.file_too_large);
+								break;
+							default:
+								info = getContext().getString(R.string.send_failed);
+								break;
+						}
+					} else {
+						info = getContext().getString(R.string.send_failed);
+					}
 				}
 				error = true;
 				break;

src/main/res/values/strings.xml

@@ -855,4 +855,5 @@
     <string name="no_users_hint_group_chat">This private group chat has no participants.</string>
     <string name="manage_permission">Manage privileges</string>
     <string name="search_participants">Search participants</string>
+    <string name="file_too_large">File too large</string>
 </resources>