Try to deduce attachment MIME type from the file extension if possible.

// FREEBIE

Podfile

@@ -5,8 +5,8 @@ target 'Signal' do
     pod 'SocketRocket',               :git => 'https://github.com/facebook/SocketRocket.git'
     pod 'AxolotlKit',                 git: 'https://github.com/WhisperSystems/SignalProtocolKit.git'
     #pod 'AxolotlKit',                 path: '../SignalProtocolKit'
-    pod 'SignalServiceKit',           git: 'https://github.com/WhisperSystems/SignalServiceKit.git'
-    #pod 'SignalServiceKit',           path: '../SignalServiceKit'
+    #pod 'SignalServiceKit',           git: 'https://github.com/WhisperSystems/SignalServiceKit.git'
+    pod 'SignalServiceKit',           path: '../SignalServiceKit'
     pod 'OpenSSL'
     pod 'JSQMessagesViewController',  git: 'https://github.com/WhisperSystems/JSQMessagesViewController.git', branch: 'mkirk/position-edit-menu'
     #pod 'JSQMessagesViewController'   path: '../JSQMessagesViewController'

Podfile.lock

@@ -114,7 +114,7 @@ DEPENDENCIES:
   - JSQMessagesViewController (from `https://github.com/WhisperSystems/JSQMessagesViewController.git`, branch `mkirk/position-edit-menu`)
   - OpenSSL
   - PureLayout
-  - SignalServiceKit (from `https://github.com/WhisperSystems/SignalServiceKit.git`)
+  - SignalServiceKit (from `../SignalServiceKit`)
   - SocketRocket (from `https://github.com/facebook/SocketRocket.git`)
 
 EXTERNAL SOURCES:
@@ -124,7 +124,7 @@ EXTERNAL SOURCES:
     :branch: mkirk/position-edit-menu
     :git: https://github.com/WhisperSystems/JSQMessagesViewController.git
   SignalServiceKit:
-    :git: https://github.com/WhisperSystems/SignalServiceKit.git
+    :path: ../SignalServiceKit
   SocketRocket:
     :git: https://github.com/facebook/SocketRocket.git
 
@@ -135,9 +135,6 @@ CHECKOUT OPTIONS:
   JSQMessagesViewController:
     :commit: 7054e4b13ee5bcd6d524adb6dc9a726e8c466308
     :git: https://github.com/WhisperSystems/JSQMessagesViewController.git
-  SignalServiceKit:
-    :commit: 955c4d8a0281ea5a53da751044ba818032bb72d1
-    :git: https://github.com/WhisperSystems/SignalServiceKit.git
   SocketRocket:
     :commit: 877ac7438be3ad0b45ef5ca3969574e4b97112bf
     :git: https://github.com/facebook/SocketRocket.git
@@ -164,6 +161,6 @@ SPEC CHECKSUMS:
   UnionFind: c33be5adb12983981d6e827ea94fc7f9e370f52d
   YapDatabase: b1e43555a34a5298e23a045be96817a5ef0da58f
 
-PODFILE CHECKSUM: 549de6756fe8eab98647be8561b3988361f62e85
+PODFILE CHECKSUM: 74ea2172e28ade89124e817d3eae14753f1e9bbf
 
 COCOAPODS: 1.2.1

Signal/src/Models/TSMessageAdapaters/TSVideoAttachmentAdapter.m

@@ -316,23 +316,8 @@ NS_ASSUME_NONNULL_BEGIN
         if (action == @selector(copy:)) {
             NSString *utiType = [MIMETypeUtil utiTypeForMIMEType:_contentType];
             if (!utiType) {
-                if ([_contentType isEqualToString:@"audio/amr"]) {
-                    utiType = @"org.3gpp.adaptive-multi-rate-audio";
-                } else if ([_contentType isEqualToString:@"audio/mp3"] ||
-                    [_contentType isEqualToString:@"audio/x-mpeg"] || [_contentType isEqualToString:@"audio/mpeg"] ||
-                    [_contentType isEqualToString:@"audio/mpeg3"] || [_contentType isEqualToString:@"audio/x-mp3"] ||
-                    [_contentType isEqualToString:@"audio/x-mpeg3"]) {
-                    utiType = (NSString *)kUTTypeMP3;
-                } else if ([_contentType isEqualToString:@"audio/aac"] ||
-                    [_contentType isEqualToString:@"audio/x-m4a"]) {
-                    utiType = (NSString *)kUTTypeMPEG4Audio;
-                } else if ([_contentType isEqualToString:@"audio/aiff"] ||
-                    [_contentType isEqualToString:@"audio/x-aiff"]) {
-                    utiType = (NSString *)kUTTypeAudioInterchangeFileFormat;
-                } else {
-                    OWSAssert(0);
-                    utiType = (NSString *)kUTTypeAudio;
-                }
+                OWSAssert(0);
+                utiType = (NSString *)kUTTypeAudio;
             }
 
             NSData *data = [NSData dataWithContentsOfURL:self.fileURL];

Signal/src/ViewControllers/MessagesViewController.m

@@ -325,6 +325,10 @@ typedef enum : NSUInteger {
 
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
 {
+    if (self.rightBarButtonItem != self.voiceMemoButton) {
+        return NO;
+    }
+
     // We want to be permissive about the voice message gesture, so we accept
     // gesture that begin within N points of the
     CGFloat kVoiceMemoGestureTolerancePoints = 10;
@@ -3158,7 +3162,7 @@ typedef enum : NSUInteger {
     self.audioRecorder = nil;
 
     NSString *filename = [NSLocalizedString(@"VOICE_MESSAGE_FILE_NAME", @"Filename for voice messages.")
-        stringByAppendingPathExtension:[MIMETypeUtil fileExtensionForUTIType:(NSString *)kUTTypeMPEG4Audio]];
+        stringByAppendingPathExtension:@".m4a"];
 
     SignalAttachment *attachment =
         [SignalAttachment attachmentWithData:audioData dataUTI:(NSString *)kUTTypeMPEG4Audio filename:filename];

Signal/src/ViewControllers/SignalAttachment.swift

@@ -168,6 +168,18 @@ class SignalAttachment: NSObject {
     // Returns the MIME type for this attachment or nil if no MIME type
     // can be identified.
     var mimeType: String {
+        if let filename = filename {
+            let fileExtension = (filename as NSString).pathExtension
+            if fileExtension.characters.count > 0 {
+                if let mimeType = MIMETypeUtil.mimeType(forFileExtension:fileExtension) {
+                    // UTI types are an imperfect means of representing file type;
+                    // file extensions are also imperfect but far more reliable and
+                    // comprehensive so we always prefer to try to deduce MIME type
+                    // from the file extension.
+                    return mimeType
+                }
+            }
+        }
         if dataUTI == SignalAttachment.kOversizeTextAttachmentUTI {
             return OWSMimeTypeOversizeTextMessage
         }