Ignore "GIF of death."

// FREEBIE

Signal/src/Signal-Bridging-Header.h

@@ -10,6 +10,7 @@
 #import "Environment.h"
 #import "FLAnimatedImage.h"
 #import "FingerprintViewController.h"
+#import "NSData+Image.h"
 #import "NotificationsManager.h"
 #import "OWSAnyTouchGestureRecognizer.h"
 #import "OWSAudioAttachmentPlayer.h"

Signal/src/ViewControllers/AttachmentApprovalViewController.swift

@@ -171,8 +171,13 @@ class AttachmentApprovalViewController: OWSViewController, OWSAudioAttachmentPla
     }
 
     private func createAnimatedPreview(attachmentPreviewView: UIView) {
+        let data = attachment.data
+        guard (data as NSData).isValidImage() else {
+            return
+        }
+
         // Use Flipboard FLAnimatedImage library to display gifs
-        guard let animatedImage = FLAnimatedImage(gifData:attachment.data) else {
+        guard let animatedImage = FLAnimatedImage(gifData:data) else {
             createGenericPreview(attachmentPreviewView:attachmentPreviewView)
             return
         }

Signal/src/ViewControllers/FullImageViewController.m

@@ -2,15 +2,16 @@
 //  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
 //
 
-#import "FLAnimatedImage.h"
 #import "FullImageViewController.h"
-#import "UIUtil.h"
+#import "AttachmentSharing.h"
-#import "UIView+OWS.h"
+#import "FLAnimatedImage.h"
-#import "TSPhotoAdapter.h"
+#import "NSData+Image.h"
-#import "TSMessageAdapter.h"
 #import "TSAnimatedAdapter.h"
+#import "TSMessageAdapter.h"
+#import "TSPhotoAdapter.h"
 #import "UIColor+OWS.h"
-#import "AttachmentSharing.h"
+#import "UIUtil.h"
+#import "UIView+OWS.h"
 
 NS_ASSUME_NONNULL_BEGIN
 
@@ -168,14 +169,18 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)initializeImageView {
     if (self.isAnimated) {
-        // Present the animated image using Flipboard/FLAnimatedImage
+        if ([self.fileData isValidImage]) {
-        FLAnimatedImage *animatedGif   = [FLAnimatedImage animatedImageWithGIFData:self.fileData];
+            // Present the animated image using Flipboard/FLAnimatedImage
-        FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];
+            FLAnimatedImage *animatedGif = [FLAnimatedImage animatedImageWithGIFData:self.fileData];
-        imageView.animatedImage        = animatedGif;
+            FLAnimatedImageView *imageView = [[FLAnimatedImageView alloc] init];
-        imageView.frame                = self.originRect;
+            imageView.animatedImage = animatedGif;
-        imageView.contentMode          = UIViewContentModeScaleAspectFill;
+            imageView.frame = self.originRect;
-        imageView.clipsToBounds        = YES;
+            imageView.contentMode = UIViewContentModeScaleAspectFill;
-        self.imageView                 = imageView;
+            imageView.clipsToBounds = YES;
+            self.imageView = imageView;
+        } else {
+            self.imageView = [[UIImageView alloc] initWithFrame:self.originRect];
+        }
     } else {
         // Present the static image using standard UIImageView
         self.imageView                              = [[UIImageView alloc] initWithFrame:self.originRect];