Delete lingering group avatar attachments

The images for group avatars are stored directly in the datbase, which
is fine since they are small. But then there's no reason to have them
lingering on the filesystem.

Also removed the unused group associatedAttachmentId property.

// FREEBIE

src/Messages/TSGroupModel.h

@@ -1,13 +1,11 @@
 //  Created by Frederic Jacobs.
 //  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
 
-#import <Foundation/Foundation.h>
 #import "TSYapDatabaseObject.h"
 
 @interface TSGroupModel : TSYapDatabaseObject
 
 @property (nonatomic, strong) NSMutableArray *groupMemberIds;
-@property (nonatomic, strong) NSString *associatedAttachmentId;
 @property (nonatomic, strong) NSString *groupName;
 @property (nonatomic, strong) NSData *groupId;
 
@@ -17,8 +15,7 @@
 - (instancetype)initWithTitle:(NSString *)title
                     memberIds:(NSMutableArray *)memberIds
                         image:(UIImage *)image
-                      groupId:(NSData *)groupId
-       associatedAttachmentId:(NSString *)attachmentId;
+                      groupId:(NSData *)groupId;
 
 - (BOOL)isEqual:(id)other;
 - (BOOL)isEqualToGroupModel:(TSGroupModel *)model;

src/Messages/TSGroupModel.m

@@ -3,8 +3,6 @@
 
 #import "TSGroupModel.h"
 
-NSString *const TSAttachementGroupAvatarFileRelationshipEdge = @"TSAttachementGroupAvatarFileEdge";
-
 @implementation TSGroupModel
 
 #if TARGET_OS_IOS
@@ -12,11 +10,10 @@ NSString *const TSAttachementGroupAvatarFileRelationshipEdge = @"TSAttachementGr
                     memberIds:(NSMutableArray *)memberIds
                         image:(UIImage *)image
                       groupId:(NSData *)groupId
-       associatedAttachmentId:(NSString *)attachmentId {
+{
     _groupName              = title;
     _groupMemberIds         = [memberIds copy];
-    _groupImage             = image;
-    _associatedAttachmentId = attachmentId;
+    _groupImage = image; // image is stored in DB
     _groupId                = groupId;
 
     return self;

src/Messages/TSMessagesManager+attachments.m

@@ -228,7 +228,8 @@ dispatch_queue_t attachmentsQueue() {
 
 - (void)decryptedAndSaveAttachment:(TSAttachmentPointer *)attachment
                               data:(NSData *)cipherText
-                         messageId:(NSString *)messageId {
+                         messageId:(NSString *)messageId
+{
     NSData *plaintext = [Cryptography decryptAttachment:cipherText withKey:attachment.encryptionKey];
 
     if (!plaintext) {
@@ -242,17 +243,15 @@ dispatch_queue_t attachmentsQueue() {
         [self.dbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
           [stream saveWithTransaction:transaction];
           if ([attachment.avatarOfGroupId length] != 0) {
-              TSGroupModel *emptyModelToFillOutId = [[TSGroupModel alloc]
-                           initWithTitle:nil
-                               memberIds:nil
-                                   image:nil
-                                 groupId:attachment.avatarOfGroupId
-                  associatedAttachmentId:attachment.uniqueId]; // TODO refactor the TSGroupThread to just take in an ID
-                                                               // (as it is all that it uses). Should not take in more
-                                                               // than it uses
+              TSGroupModel *emptyModelToFillOutId =
+                  [[TSGroupModel alloc] initWithTitle:nil memberIds:nil image:nil groupId:attachment.avatarOfGroupId];
               TSGroupThread *gThread =
                   [TSGroupThread getOrCreateThreadWithGroupModel:emptyModelToFillOutId transaction:transaction];
+
               gThread.groupModel.groupImage = [stream image];
+              // No need to keep the attachment around after assigning the image.
+              [stream removeWithTransaction:transaction];
+
               [gThread saveWithTransaction:transaction];
           } else {
               // Causing message to be reloaded in view.

src/Messages/TSMessagesManager.m

@@ -158,23 +158,17 @@
     }
 }
 
-- (void)handleIncomingMessage:(IncomingPushMessageSignal *)incomingMessage
-              withPushContent:(PushMessageContent *)content {
+- (void)handleIncomingMessage:(IncomingPushMessageSignal *)incomingMessage withPushContent:(PushMessageContent *)content
+{
     if (content.hasGroup) {
         __block BOOL ignoreMessage = NO;
         [self.dbConnection readWithBlock:^(YapDatabaseReadTransaction *transaction) {
-          TSGroupModel *emptyModelToFillOutId =
-              [[TSGroupModel alloc] initWithTitle:nil
-                                        memberIds:nil
-                                            image:nil
-                                          groupId:content.group.id
-                           associatedAttachmentId:nil]; // TODO refactor the TSGroupThread to
-                                                        // just take in an ID (as it
-          // is all that it uses). Should not take in more than it uses
-          TSGroupThread *gThread = [TSGroupThread threadWithGroupModel:emptyModelToFillOutId transaction:transaction];
-          if (gThread == nil && content.group.type != PushMessageContentGroupContextTypeUpdate) {
-              ignoreMessage = YES;
-          }
+            TSGroupModel *emptyModelToFillOutId =
+                [[TSGroupModel alloc] initWithTitle:nil memberIds:nil image:nil groupId:content.group.id];
+            TSGroupThread *gThread = [TSGroupThread threadWithGroupModel:emptyModelToFillOutId transaction:transaction];
+            if (gThread == nil && content.group.type != PushMessageContentGroupContextTypeUpdate) {
+                ignoreMessage = YES;
+            }
         }];
         if (ignoreMessage) {
             DDLogDebug(@"Received message from group that I left or don't know "
@@ -254,8 +248,7 @@
               [[TSGroupModel alloc] initWithTitle:content.group.name
                                         memberIds:[[[NSSet setWithArray:content.group.members] allObjects] mutableCopy]
                                             image:nil
-                                          groupId:content.group.id
-                           associatedAttachmentId:nil];
+                                          groupId:content.group.id];
           TSGroupThread *gThread = [TSGroupThread getOrCreateThreadWithGroupModel:model transaction:transaction];
           [gThread saveWithTransaction:transaction];
 
@@ -266,8 +259,9 @@
                   if ([avatar isKindOfClass:[TSAttachmentStream class]]) {
                       TSAttachmentStream *stream = (TSAttachmentStream *)avatar;
                       if ([stream isImage]) {
-                          model.associatedAttachmentId = stream.uniqueId;
-                          model.groupImage             = [stream image];
+                          model.groupImage = [stream image];
+                          // No need to keep the attachment around after assigning the image.
+                          [stream removeWithTransaction:transaction];
                       }
                   }
               }

tests/Storage/TSMessageStorageTests.m

@@ -159,13 +159,17 @@
 
     __block TSGroupThread *thread;
     [[TSStorageManager sharedManager].dbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
-        thread = [TSGroupThread getOrCreateThreadWithGroupModel:[[TSGroupModel alloc] initWithTitle:@"fdsfsd" memberIds:[@[] mutableCopy] image:nil groupId:[NSData data] associatedAttachmentId:pointer.uniqueId] transaction:transaction];
-        
+        thread = [TSGroupThread getOrCreateThreadWithGroupModel:[[TSGroupModel alloc] initWithTitle:@"fdsfsd"
+                                                                                          memberIds:[@[] mutableCopy]
+                                                                                              image:nil
+                                                                                            groupId:[NSData data]]
+                                                    transaction:transaction];
+
         [thread saveWithTransaction:transaction];
         [pointer saveWithTransaction:transaction];
 
     }];
-    
+
     TSStorageManager *manager         = [TSStorageManager sharedManager];
     [manager purgeCollection:[TSMessage collection]];