Refine sync messages.

SignalServiceKit/src/Contacts/Threads/TSGroupThread.h

@@ -22,7 +22,6 @@ NS_ASSUME_NONNULL_BEGIN
 + (instancetype)getOrCreateThreadWithGroupId:(NSData *)groupId
                                  transaction:(YapDatabaseReadWriteTransaction *)transaction;
 
-+ (nullable instancetype)threadWithGroupId:(NSData *)groupId;
 + (nullable instancetype)threadWithGroupId:(NSData *)groupId transaction:(YapDatabaseReadTransaction *)transaction;
 
 + (NSString *)threadIdFromGroupId:(NSData *)groupId;

SignalServiceKit/src/Contacts/Threads/TSGroupThread.m

@@ -58,17 +58,6 @@ NS_ASSUME_NONNULL_BEGIN
     return self;
 }
 
-+ (nullable instancetype)threadWithGroupId:(NSData *)groupId;
-{
-    OWSAssert(groupId.length > 0);
-
-    __block TSGroupThread *thread;
-    [[self dbReadWriteConnection] readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
-        thread = [self threadWithGroupId:groupId transaction:transaction];
-    }];
-    return thread;
-}
-
 + (nullable instancetype)threadWithGroupId:(NSData *)groupId transaction:(YapDatabaseReadTransaction *)transaction
 {
     OWSAssert(groupId.length > 0);

SignalServiceKit/src/Devices/OWSGroupsOutputStream.h

@@ -1,14 +1,17 @@
-//  Copyright © 2016 Open Whisper Systems. All rights reserved.
+//
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
+//
 
 #import "OWSChunkedOutputStream.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
 @class TSGroupModel;
+@class YapDatabaseReadTransaction;
 
 @interface OWSGroupsOutputStream : OWSChunkedOutputStream
 
-- (void)writeGroup:(TSGroupModel *)group;
+- (void)writeGroup:(TSGroupModel *)group transaction:(YapDatabaseReadTransaction *)transaction;
 
 @end
 

SignalServiceKit/src/Devices/OWSGroupsOutputStream.m

@@ -14,8 +14,11 @@ NS_ASSUME_NONNULL_BEGIN
 
 @implementation OWSGroupsOutputStream
 
-- (void)writeGroup:(TSGroupModel *)group
+- (void)writeGroup:(TSGroupModel *)group transaction:(YapDatabaseReadTransaction *)transaction
 {
+    OWSAssert(group);
+    OWSAssert(transaction);
+
     OWSSignalServiceProtosGroupDetailsBuilder *groupBuilder = [OWSSignalServiceProtosGroupDetailsBuilder new];
     [groupBuilder setId:group.groupId];
     [groupBuilder setName:group.groupName];
@@ -37,10 +40,10 @@ NS_ASSUME_NONNULL_BEGIN
     [self.delegateStream writeRawVarint32:groupDataLength];
     [self.delegateStream writeRawData:groupData];
 
-    TSGroupThread *_Nullable groupThread = [TSGroupThread threadWithGroupId:group.groupId];
+    TSGroupThread *_Nullable groupThread = [TSGroupThread threadWithGroupId:group.groupId transaction:transaction];
     if (groupThread) {
         OWSDisappearingMessagesConfiguration *_Nullable disappearingMessagesConfiguration =
-            [OWSDisappearingMessagesConfiguration fetchObjectWithUniqueID:groupThread.uniqueId];
+            [OWSDisappearingMessagesConfiguration fetchObjectWithUniqueID:groupThread.uniqueId transaction:transaction];
 
         if (disappearingMessagesConfiguration && disappearingMessagesConfiguration.isEnabled) {
             [groupBuilder setExpireTimer:disappearingMessagesConfiguration.durationSeconds];

SignalServiceKit/src/Messages/Attachments/TSAttachmentStream.h

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "DataSource.h"
@@ -53,6 +53,7 @@ NS_ASSUME_NONNULL_BEGIN
 + (void)deleteAttachments;
 + (NSString *)attachmentsFolder;
 
+- (BOOL)shouldHaveImageSize;
 - (CGSize)imageSize;
 
 - (CGFloat)audioDurationSeconds;

SignalServiceKit/src/Messages/Attachments/TSAttachmentStream.m

@@ -19,9 +19,11 @@ NS_ASSUME_NONNULL_BEGIN
 // changes in the file path generation logic don't break existing attachments.
 @property (nullable, nonatomic) NSString *localRelativeFilePath;
 
-// These properties should only be accessed on the main thread.
+// These properties should only be accessed while synchronized on self.
 @property (nullable, nonatomic) NSNumber *cachedImageWidth;
 @property (nullable, nonatomic) NSNumber *cachedImageHeight;
+
+// This property should only be accessed on the main thread.
 @property (nullable, nonatomic) NSNumber *cachedAudioDurationSeconds;
 
 @end
@@ -105,8 +107,11 @@ NS_ASSUME_NONNULL_BEGIN
 
     if (attachmentSchemaVersion < 4) {
         // Legacy image sizes don't correctly reflect image orientation.
-        self.cachedImageWidth = nil;
-        self.cachedImageHeight = nil;
+        @synchronized(self)
+        {
+            self.cachedImageWidth = nil;
+            self.cachedImageHeight = nil;
+        }
     }
 }
 
@@ -390,35 +395,46 @@ NS_ASSUME_NONNULL_BEGIN
     }
 }
 
+- (BOOL)shouldHaveImageSize
+{
+    return ([self isVideo] || [self isImage] || [self isAnimated]);
+}
+
 - (CGSize)imageSize
 {
-    OWSAssertIsOnMainThread();
+    OWSAssert(self.shouldHaveImageSize);
 
-    if (self.cachedImageWidth && self.cachedImageHeight) {
-        return CGSizeMake(self.cachedImageWidth.floatValue, self.cachedImageHeight.floatValue);
-    }
-
-    CGSize imageSize = [self calculateImageSize];
-    self.cachedImageWidth = @(imageSize.width);
-    self.cachedImageHeight = @(imageSize.height);
-
-    [self.dbReadWriteConnection asyncReadWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
-
-        NSString *collection = [[self class] collection];
-        TSAttachmentStream *latestInstance = [transaction objectForKey:self.uniqueId inCollection:collection];
-        if (latestInstance) {
-            latestInstance.cachedImageWidth = @(imageSize.width);
-            latestInstance.cachedImageHeight = @(imageSize.height);
-            [latestInstance saveWithTransaction:transaction];
-        } else {
-            // This message has not yet been saved or has been deleted; do nothing.
-            // This isn't an error per se, but these race conditions should be
-            // _very_ rare.
-            OWSFail(@"%@ Attachment not yet saved.", self.logTag);
+    @synchronized(self)
+    {
+        if (self.cachedImageWidth && self.cachedImageHeight) {
+            return CGSizeMake(self.cachedImageWidth.floatValue, self.cachedImageHeight.floatValue);
         }
-    }];
 
-    return imageSize;
+        CGSize imageSize = [self calculateImageSize];
+        if (imageSize.width <= 0 || imageSize.height <= 0) {
+            return CGSizeZero;
+        }
+        self.cachedImageWidth = @(imageSize.width);
+        self.cachedImageHeight = @(imageSize.height);
+
+        [self.dbReadWriteConnection asyncReadWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
+
+            NSString *collection = [[self class] collection];
+            TSAttachmentStream *latestInstance = [transaction objectForKey:self.uniqueId inCollection:collection];
+            if (latestInstance) {
+                latestInstance.cachedImageWidth = @(imageSize.width);
+                latestInstance.cachedImageHeight = @(imageSize.height);
+                [latestInstance saveWithTransaction:transaction];
+            } else {
+                // This message has not yet been saved or has been deleted; do nothing.
+                // This isn't an error per se, but these race conditions should be
+                // _very_ rare.
+                OWSFail(@"%@ Attachment not yet saved.", self.logTag);
+            }
+        }];
+
+        return imageSize;
+    }
 }
 
 - (CGFloat)calculateAudioDurationSeconds

SignalServiceKit/src/Messages/DeviceSyncing/OWSSyncGroupsMessage.m

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSSyncGroupsMessage.h"
@@ -57,7 +57,7 @@ NS_ASSUME_NONNULL_BEGIN
                                                return;
                                            }
                                            TSGroupModel *group = ((TSGroupThread *)obj).groupModel;
-                                           [groupsOutputStream writeGroup:group];
+                                           [groupsOutputStream writeGroup:group transaction:transaction];
                                        }];
 
     [groupsOutputStream flush];

SignalServiceKit/src/Messages/Interactions/TSOutgoingMessage.m

@@ -535,13 +535,15 @@ NSString *const kTSOutgoingMessageSentRecipientAll = @"kTSOutgoingMessageSentRec
     [builder setDigest:attachmentStream.digest];
     [builder setFlags:(self.isVoiceMessage ? OWSSignalServiceProtosAttachmentPointerFlagsVoiceMessage : 0)];
 
-    CGSize imageSize = [attachmentStream imageSize];
-    if (imageSize.width < NSIntegerMax && imageSize.height < NSIntegerMax) {
-        NSInteger imageWidth = (NSInteger)round(imageSize.width);
-        NSInteger imageHeight = (NSInteger)round(imageSize.height);
-        if (imageWidth > 0 && imageHeight > 0) {
-            [builder setWidth:(UInt32)imageWidth];
-            [builder setHeight:(UInt32)imageHeight];
+    if ([attachmentStream shouldHaveImageSize]) {
+        CGSize imageSize = [attachmentStream imageSize];
+        if (imageSize.width < NSIntegerMax && imageSize.height < NSIntegerMax) {
+            NSInteger imageWidth = (NSInteger)round(imageSize.width);
+            NSInteger imageHeight = (NSInteger)round(imageSize.height);
+            if (imageWidth > 0 && imageHeight > 0) {
+                [builder setWidth:(UInt32)imageWidth];
+                [builder setHeight:(UInt32)imageHeight];
+            }
         }
     }
 

SignalServiceKit/src/Messages/OWSMessageManager.m

@@ -312,6 +312,19 @@ NS_ASSUME_NONNULL_BEGIN
     OWSAssert(dataMessage);
     OWSAssert(transaction);
 
+    if (dataMessage.hasTimestamp) {
+        if (dataMessage.timestamp <= 0) {
+            DDLogError(@"%@ Ignoring message with invalid data message timestamp: %@", self.logTag, envelope.source);
+            return;
+        }
+        // This prevents replay attacks by the service.
+        if (dataMessage.timestamp != envelope.timestamp) {
+            DDLogError(
+                @"%@ Ignoring message with non-matching data message timestamp: %@", self.logTag, envelope.source);
+            return;
+        }
+    }
+
     if ([dataMessage hasProfileKey]) {
         NSData *profileKey = [dataMessage profileKey];
         NSString *recipientId = envelope.source;