Respond to CR.

// FREEBIE

Signal.xcodeproj/project.pbxproj

@@ -34,7 +34,6 @@
 		345671011E89A5F1006EE662 /* ThreadUtil.m in Sources */ = {isa = PBXBuildFile; fileRef = 345671001E89A5F1006EE662 /* ThreadUtil.m */; };
 		3456710A1E8A9F5D006EE662 /* TSGenericAttachmentAdapter.m in Sources */ = {isa = PBXBuildFile; fileRef = 345671091E8A9F5D006EE662 /* TSGenericAttachmentAdapter.m */; };
 		346B66311F4E29B200E5122F /* CropScaleImageViewController.swift in Sources */ = {isa = PBXBuildFile; fileRef = 346B66301F4E29B200E5122F /* CropScaleImageViewController.swift */; };
-		346B66381F55E24900E5122F /* NSData+Image.m in Sources */ = {isa = PBXBuildFile; fileRef = 346B66371F55E24900E5122F /* NSData+Image.m */; };
 		3471B1DA1EB7C63600F6AEC8 /* NewNonContactConversationViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 3471B1D91EB7C63600F6AEC8 /* NewNonContactConversationViewController.m */; };
 		3472229F1EB22FFE00E53955 /* AddToGroupViewController.m in Sources */ = {isa = PBXBuildFile; fileRef = 3472229E1EB22FFE00E53955 /* AddToGroupViewController.m */; };
 		348F2EAE1F0D21BC00D4ECE0 /* DeviceSleepManager.swift in Sources */ = {isa = PBXBuildFile; fileRef = 348F2EAD1F0D21BC00D4ECE0 /* DeviceSleepManager.swift */; };
@@ -446,8 +445,6 @@
 		345671081E8A9F5D006EE662 /* TSGenericAttachmentAdapter.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = TSGenericAttachmentAdapter.h; sourceTree = "<group>"; };
 		345671091E8A9F5D006EE662 /* TSGenericAttachmentAdapter.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = TSGenericAttachmentAdapter.m; sourceTree = "<group>"; };
 		346B66301F4E29B200E5122F /* CropScaleImageViewController.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CropScaleImageViewController.swift; sourceTree = "<group>"; };
-		346B66361F55E24900E5122F /* NSData+Image.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "NSData+Image.h"; sourceTree = "<group>"; };
-		346B66371F55E24900E5122F /* NSData+Image.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "NSData+Image.m"; sourceTree = "<group>"; };
 		3471B1D81EB7C63600F6AEC8 /* NewNonContactConversationViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = NewNonContactConversationViewController.h; sourceTree = "<group>"; };
 		3471B1D91EB7C63600F6AEC8 /* NewNonContactConversationViewController.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = NewNonContactConversationViewController.m; sourceTree = "<group>"; };
 		3472229D1EB22FFE00E53955 /* AddToGroupViewController.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = AddToGroupViewController.h; sourceTree = "<group>"; };
@@ -1426,8 +1423,6 @@
 				76EB04EA18170B33006006FC /* FunctionalUtil.h */,
 				76EB04EB18170B33006006FC /* FunctionalUtil.m */,
 				455AC69A1F4F79E500134004 /* ImageCache.swift */,
-				346B66361F55E24900E5122F /* NSData+Image.h */,
-				346B66371F55E24900E5122F /* NSData+Image.m */,
 				B62F5E0E1C2980B4000D370C /* NSData+ows_StripToken.h */,
 				B62F5E0F1C2980B4000D370C /* NSData+ows_StripToken.m */,
 				76EB04EC18170B33006006FC /* NumberUtil.h */,
@@ -2241,7 +2236,6 @@
 				45794E861E00620000066731 /* CallUIAdapter.swift in Sources */,
 				4585C4681ED8F8D200896AEA /* SafetyNumberConfirmationAlert.swift in Sources */,
 				FCFA64B71A24F6730007FB87 /* UIFont+OWS.m in Sources */,
-				346B66381F55E24900E5122F /* NSData+Image.m in Sources */,
 				B6B9ECFC198B31BA00C620D3 /* PushManager.m in Sources */,
 				45DF5DF21DDB843F00C936C7 /* CompareSafetyNumbersActivity.swift in Sources */,
 				458DE9D91DEE7B360071BB03 /* OWSWebRTCDataProtos.pb.m in Sources */,

Signal/src/Models/TSMessageAdapaters/JSQMediaItem+OWS.m

@@ -6,6 +6,7 @@
 #import "NumberUtil.h"
 #import "UIDevice+TSHardwareVersion.h"
 #import <ImageIO/ImageIO.h>
+#import <SignalServiceKit/NSData+Image.h>
 
 @implementation JSQMediaItem (OWS)
 
@@ -42,6 +43,10 @@
 {
     OWSAssert(imageURL);
 
+    if (![NSData ows_isValidImageAtPath:imageURL.path]) {
+        return CGSizeZero;
+    }
+
     // With CGImageSource we avoid loading the whole image into memory.
     CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)imageURL, NULL);
     if (!source) {

Signal/src/Models/TSMessageAdapaters/TSAnimatedAdapter.m

@@ -6,13 +6,13 @@
 #import "AttachmentUploadView.h"
 #import "FLAnimatedImage.h"
 #import "JSQMediaItem+OWS.h"
-#import "NSData+Image.h"
 #import "TSAttachmentStream.h"
 #import "UIColor+OWS.h"
 #import <AssetsLibrary/AssetsLibrary.h>
 #import <JSQMessagesViewController/JSQMessagesMediaViewBubbleImageMasker.h>
 #import <MobileCoreServices/MobileCoreServices.h>
 #import <SignalServiceKit/MIMETypeUtil.h>
+#import <SignalServiceKit/NSData+Image.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -28,8 +28,6 @@ NS_ASSUME_NONNULL_BEGIN
 // See comments on OWSMessageMediaAdapter.
 @property (nonatomic, nullable, weak) id lastPresentingCell;
 
-@property (nonatomic) NSNumber *isImageValid;
-
 @end
 
 #pragma mark -
@@ -99,21 +97,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 #pragma mark - JSQMessageMediaData protocol
 
-- (NSNumber *)isImageValid
-{
-    if (!_isImageValid) {
-        _isImageValid = @([NSData isValidImageAtPath:[self.attachment mediaURL].path]);
-    }
-    return _isImageValid;
-}
-
 - (UIView *)mediaView {
     OWSAssert([NSThread isMainThread]);
 
     if (self.cachedImageView == nil) {
-        if (![self isImageValid]) {
-            return nil;
-        }
         // Use Flipboard FLAnimatedImage library to display gifs
         NSData *fileData = [NSData dataWithContentsOfURL:[self.attachment mediaURL]];
         if (!fileData) {
@@ -122,6 +109,9 @@ NS_ASSUME_NONNULL_BEGIN
             view.backgroundColor = [UIColor colorWithWhite:0.85f alpha:1.f];
             return view;
         }
+        if (![fileData ows_isValidImage]) {
+            return nil;
+        }
         FLAnimatedImage *animatedGif = [FLAnimatedImage animatedImageWithGIFData:fileData];
         FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];
         imageView.animatedImage        = animatedGif;

Signal/src/Profiles/OWSProfileManager.m

@@ -7,6 +7,7 @@
 #import "NSString+OWS.h"
 #import "Signal-Swift.h"
 #import <SignalServiceKit/Cryptography.h>
+#import <SignalServiceKit/NSData+Image.h>
 #import <SignalServiceKit/NSData+hexString.h>
 #import <SignalServiceKit/NSDate+OWS.h>
 #import <SignalServiceKit/OWSMessageSender.h>
@@ -1333,7 +1334,11 @@ const NSUInteger kOWSProfileManager_MaxAvatarDiameter = 640;
 {
     OWSAssert(filename.length > 0);
 
-    UIImage *_Nullable image = [UIImage imageWithData:[self loadProfileDataWithFilename:filename]];
+    NSData *data = [self loadProfileDataWithFilename:filename];
+    if (![data ows_isValidImage]) {
+        return nil;
+    }
+    UIImage *_Nullable image = [UIImage imageWithData:data];
     return image;
 }
 

Signal/src/Signal-Bridging-Header.h

@@ -10,7 +10,6 @@
 #import "Environment.h"
 #import "FLAnimatedImage.h"
 #import "FingerprintViewController.h"
-#import "NSData+Image.h"
 #import "NotificationsManager.h"
 #import "OWSAnyTouchGestureRecognizer.h"
 #import "OWSAudioAttachmentPlayer.h"
@@ -49,6 +48,7 @@
 #import <SignalServiceKit/Cryptography.h>
 #import <SignalServiceKit/MIMETypeUtil.h>
 #import <SignalServiceKit/NSData+Base64.h>
+#import <SignalServiceKit/NSData+Image.h>
 #import <SignalServiceKit/NSDate+millisecondTimeStamp.h>
 #import <SignalServiceKit/NSTimer+OWS.h>
 #import <SignalServiceKit/OWSAcknowledgeMessageDeliveryRequest.h>

Signal/src/ViewControllers/AttachmentApprovalViewController.swift

@@ -172,7 +172,7 @@ class AttachmentApprovalViewController: OWSViewController, OWSAudioAttachmentPla
 
     private func createAnimatedPreview(attachmentPreviewView: UIView) {
         let data = attachment.data
-        guard (data as NSData).isValidImage() else {
+        guard (data as NSData).ows_isValidImage() else {
             return
         }
 

Signal/src/ViewControllers/FullImageViewController.m

@@ -5,13 +5,13 @@
 #import "FullImageViewController.h"
 #import "AttachmentSharing.h"
 #import "FLAnimatedImage.h"
-#import "NSData+Image.h"
 #import "TSAnimatedAdapter.h"
 #import "TSMessageAdapter.h"
 #import "TSPhotoAdapter.h"
 #import "UIColor+OWS.h"
 #import "UIUtil.h"
 #import "UIView+OWS.h"
+#import <SignalServiceKit/NSData+Image.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -169,7 +169,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)initializeImageView {
     if (self.isAnimated) {
-        if ([self.fileData isValidImage]) {
+        if ([self.fileData ows_isValidImage]) {
             // Present the animated image using Flipboard/FLAnimatedImage
             FLAnimatedImage *animatedGif = [FLAnimatedImage animatedImageWithGIFData:self.fileData];
             FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];

Signal/src/util/UIUtil.h

@@ -1,9 +1,12 @@
+//
+//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//
+
 #import <Foundation/Foundation.h>
 
 #import "MIMETypeUtil.h"
 #import "UIColor+OWS.h"
 #import "UIFont+OWS.h"
-#import "UIImage+contentTypes.h"
 #import "UIImage+normalizeImage.h"
 
 typedef void (^completionBlock)(void);

SignalServiceKit/src/Messages/Attachments/TSAttachmentStream.m

@@ -4,6 +4,7 @@
 
 #import "TSAttachmentStream.h"
 #import "MIMETypeUtil.h"
+#import "NSData+Image.h"
 #import "TSAttachmentPointer.h"
 #import <AVFoundation/AVFoundation.h>
 #import <ImageIO/ImageIO.h>
@@ -257,6 +258,9 @@ NS_ASSUME_NONNULL_BEGIN
         if (!mediaUrl) {
             return nil;
         }
+        if (![NSData ows_isValidImageAtPath:mediaUrl.path]) {
+            return nil;
+        }
         return [UIImage imageWithData:[NSData dataWithContentsOfURL:mediaUrl]];
     } else {
         return nil;
@@ -314,6 +318,9 @@ NS_ASSUME_NONNULL_BEGIN
         if (!mediaUrl) {
             return CGSizeZero;
         }
+        if (![NSData ows_isValidImageAtPath:mediaUrl.path]) {
+            return CGSizeZero;
+        }
 
         // With CGImageSource we avoid loading the whole image into memory.
         CGImageSourceRef source = CGImageSourceCreateWithURL((CFURLRef)mediaUrl, NULL);

SignalServiceKit/src/Util/MIMETypeUtil.m

@@ -4,7 +4,6 @@
 
 #import "MIMETypeUtil.h"
 #if TARGET_OS_IPHONE
-#import "UIImage+contentTypes.h"
 #import <MobileCoreServices/MobileCoreServices.h>
 #else
 #import <CoreServices/CoreServices.h>

SignalServiceKit/src/Util/NSData+Image.h

@@ -6,7 +6,7 @@
 
 @interface NSData (Image)
 
-+ (BOOL)isValidImageAtPath:(NSString *)filePath;
++ (BOOL)ows_isValidImageAtPath:(NSString *)filePath;
-- (BOOL)isValidImage;
+- (BOOL)ows_isValidImage;
 
 @end

SignalServiceKit/src/Util/NSData+Image.m

@@ -15,7 +15,7 @@ typedef NS_ENUM(NSInteger, ImageFormat) {
 
 @implementation NSData (Image)
 
-+ (BOOL)isValidImageAtPath:(NSString *)filePath
++ (BOOL)ows_isValidImageAtPath:(NSString *)filePath
 {
     NSError *error = nil;
     NSData *data = [NSData dataWithContentsOfFile:filePath options:NSMappedRead error:&error];
@@ -23,18 +23,18 @@ typedef NS_ENUM(NSInteger, ImageFormat) {
         DDLogError(@"%@ could not read image data: %@", self.tag, error);
     }
 
-    return [data isValidImage];
+    return [data ows_isValidImage];
 }
 
-- (BOOL)isValidImage
+- (BOOL)ows_isValidImage
 {
     // Don't trust the file extension; iOS (e.g. UIKit, Core Graphics) will happily
     // load a .gif with a .png file extension.
     //
     // Instead, use the "magic numbers" in the file data to determine the image format.
-    ImageFormat imageFormat = [self guessImageFormat];
+    ImageFormat imageFormat = [self ows_guessImageFormat];
     if (imageFormat == ImageFormat_Gif) {
-        return [self hasValidGifSize];
+        return [self ows_hasValidGifSize];
     } else if (imageFormat == ImageFormat_Unknown) {
         return NO;
     } else {
@@ -42,7 +42,7 @@ typedef NS_ENUM(NSInteger, ImageFormat) {
     }
 }
 
-- (ImageFormat)guessImageFormat
+- (ImageFormat)ows_guessImageFormat
 {
     const NSUInteger kTwoBytesLength = 2;
     if (self.length < kTwoBytesLength) {
@@ -74,7 +74,7 @@ typedef NS_ENUM(NSInteger, ImageFormat) {
     return ImageFormat_Unknown;
 }
 
-+ (BOOL)areByteArraysEqual:(NSUInteger)length left:(unsigned char *)left right:(unsigned char *)right
++ (BOOL)ows_areByteArraysEqual:(NSUInteger)length left:(unsigned char *)left right:(unsigned char *)right
 {
     for (NSUInteger i = 0; i < length; i++) {
         if (left[i] != right[i]) {
@@ -88,7 +88,7 @@ typedef NS_ENUM(NSInteger, ImageFormat) {
 //
 // See: https://blog.flanker017.me/cve-2017-2416-gif-remote-exec/
 // See: https://www.w3.org/Graphics/GIF/spec-gif89a.txt
-- (BOOL)hasValidGifSize
+- (BOOL)ows_hasValidGifSize
 {
     const NSUInteger kSignatureLength = 3;
     const NSUInteger kVersionLength = 3;
@@ -110,8 +110,8 @@ typedef NS_ENUM(NSInteger, ImageFormat) {
     unsigned char kGif89APrefix[kPrefixLength] = {
         0x47, 0x49, 0x46, 0x38, 0x39, 0x61,
     };
-    if (![NSData areByteArraysEqual:kPrefixLength left:bytes right:kGif87APrefix]
+    if (![NSData ows_areByteArraysEqual:kPrefixLength left:bytes right:kGif87APrefix]
-        && ![NSData areByteArraysEqual:kPrefixLength left:bytes right:kGif89APrefix]) {
+        && ![NSData ows_areByteArraysEqual:kPrefixLength left:bytes right:kGif89APrefix]) {
         return NO;
     }
     NSUInteger width = ((NSUInteger)bytes[kPrefixLength + 0]) | (((NSUInteger)bytes[kPrefixLength + 1] << 8));

SignalServiceKit/src/Util/UIImage+contentTypes.h

@@ -1,16 +0,0 @@
-//
-//  UIImage+contentTypes.h
-//  Signal
-//
-//  Created by Frederic Jacobs on 21/12/14.
-//  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
-//
-
-#import <UIKit/UIKit.h>
-
-@interface UIImage (contentTypes)
-
-- (NSString *)contentType;
-- (BOOL)isSupportedImageType;
-
-@end

SignalServiceKit/src/Util/UIImage+contentTypes.m

@@ -1,34 +0,0 @@
-//  Created by Frederic Jacobs on 21/12/14.
-//  Copyright (c) 2014 Open Whisper Systems. All rights reserved.
-
-#import "MIMETypeUtil.h"
-#import "UIImage+contentTypes.h"
-
-@implementation UIImage (contentTypes)
-
-- (NSString *)contentType {
-    uint8_t c;
-    [UIImagePNGRepresentation(self) getBytes:&c length:1];
-
-    switch (c) {
-        case 0xFF:
-            return @"image/jpeg";
-        case 0x89:
-            return OWSMimeTypeImagePng;
-        case 0x47:
-            return @"image/gif";
-        case 0x49:
-            break;
-        case 0x42:
-            return @"image/bmp";
-        case 0x4D:
-            return @"image/tiff";
-    }
-    return nil;
-}
-
-- (BOOL)isSupportedImageType {
-    return ([self contentType] ? YES : NO);
-}
-
-@end