Added detach operation

app/src/main/java/eu/faircode/email/AdapterAttachment.java

@@ -366,8 +366,7 @@ public class AdapterAttachment extends RecyclerView.Adapter<AdapterAttachment.Vi
                             EntityMessage message = db.message().getMessage(attachment.message);
                             if (message == null)
                                 return null;
-                            EntityOperation.queue(context, message, EntityOperation.ATTACHMENT, attachment.id, true);
-                            db.message().setMessageUiHide(message.id, true);
+                            EntityOperation.queue(context, message, EntityOperation.DETACH, attachment.id, true);
                         } else
                             db.attachment().deleteAttachment(attachment.id);
 

app/src/main/java/eu/faircode/email/Core.java

@@ -507,6 +507,10 @@ class Core {
                                     onAttachment(context, jargs, folder, message, op, (IMAPFolder) ifolder);
                                     break;
 
+                                case EntityOperation.DETACH:
+                                    onDetach(context, jargs, folder, message, op, (IMAPFolder) ifolder);
+                                    break;
+
                                 case EntityOperation.EXISTS:
                                     onExists(context, jargs, account, folder, message, op, (IMAPFolder) ifolder);
                                     break;
@@ -2056,7 +2060,6 @@ class Core {
         DB db = DB.getInstance(context);
 
         long id = jargs.getLong(0);
-        boolean delete = jargs.optBoolean(1, false);
 
         // Get attachment
         EntityAttachment attachment = db.attachment().getAttachment(id);
@@ -2066,7 +2069,7 @@ class Core {
             throw new IllegalArgumentException("Local attachment not found");
         if (attachment.subsequence != null)
             throw new IllegalArgumentException("Download of sub attachment");
-        if (attachment.available && !delete)
+        if (attachment.available)
             return;
         if (message.uid == null)
             throw new IllegalArgumentException("Attachment/message uid missing");
@@ -2076,33 +2079,48 @@ class Core {
         if (imessage == null)
             throw new MessageRemovedException();
 
-        if (delete) {
-            MimeMessage icopy = new MimeMessageEx((MimeMessage) imessage, message.msgid);
+        // Get message parts
+        MessageHelper helper = new MessageHelper((MimeMessage) imessage, context);
+        MessageHelper.MessageParts parts = helper.getMessageParts();
+
+        // Download attachment
+        parts.downloadAttachment(context, attachment, folder);
+
+        if (attachment.size != null)
+            EntityLog.log(context, "Operation attachment size=" + attachment.size);
+    }
+
+    private static void onDetach(Context context, JSONArray jargs, EntityFolder folder, EntityMessage message, EntityOperation op, IMAPFolder ifolder) throws JSONException, MessagingException, IOException {
+        DB db = DB.getInstance(context);
+
+        long id = jargs.getLong(0);
+
+        if (message.uid == null)
+            throw new IllegalArgumentException("Delete attachments uid missing");
+
+        // Get message
+        Message imessage = ifolder.getMessageByUID(message.uid);
+        if (imessage == null)
+            throw new MessageRemovedException();
+
+        String msgid = EntityMessage.generateMessageId();
+        MimeMessage icopy = new MimeMessageEx((MimeMessage) imessage, msgid);
         MessageHelper helper = new MessageHelper(icopy, context);
         MessageHelper.MessageParts parts = helper.getMessageParts();
         List<MessageHelper.AttachmentPart> aparts = parts.getAttachmentParts();
 
-            if (attachment.sequence > aparts.size())
-                throw new IllegalArgumentException("Invalid attachment sequence=" + attachment.sequence + "/" + aparts.size());
+        List<EntityAttachment> attachments = db.attachment().getAttachments(message.id);
+        for (EntityAttachment attachment : attachments)
+            if (attachment.id.equals(id) && BuildConfig.DEBUG) {
                 Part apart = aparts.get(attachment.sequence - 1).part;
                 if (!deletePart(icopy, apart))
                     throw new IllegalArgumentException("Attachment part not found");
+            }
 
         ifolder.appendMessages(new Message[]{icopy});
 
         imessage.setFlag(Flags.Flag.DELETED, true);
         expunge(context, ifolder, Arrays.asList(imessage));
-        } else {
-            // Get message parts
-            MessageHelper helper = new MessageHelper((MimeMessage) imessage, context);
-            MessageHelper.MessageParts parts = helper.getMessageParts();
-
-            // Download attachment
-            parts.downloadAttachment(context, attachment, folder);
-
-            if (attachment.size != null)
-                EntityLog.log(context, "Operation attachment size=" + attachment.size);
-        }
     }
 
     static boolean deletePart(Part part, Part attachment) throws MessagingException, IOException {

app/src/main/java/eu/faircode/email/EntityOperation.java

@@ -97,6 +97,7 @@ public class EntityOperation {
     static final String RAW = "raw";
     static final String BODY = "body";
     static final String ATTACHMENT = "attachment";
+    static final String DETACH = "detach";
     static final String SYNC = "sync";
     static final String SUBSCRIBE = "subscribe";
     static final String SEND = "send";
@@ -525,11 +526,11 @@ public class EntityOperation {
                     }
                 }
 */
-            } else if (ATTACHMENT.equals(name)) {
-                boolean delete = jargs.optBoolean(1, false);
-                if (!delete)
+            } else if (ATTACHMENT.equals(name))
                 db.attachment().setProgress(jargs.getLong(0), 0);
-            }
+
+            else if (DETACH.equals(name))
+                db.message().setMessageUiHide(message.id, true);
 
             queue(context, message.account, message.folder, message.id, name, jargs);