From e9d6a3747c69443806b5cb5964ece7b2ef11275d Mon Sep 17 00:00:00 2001
From: Matthew Chen <charlesmchen@gmail.com>
Date: Thu, 30 Mar 2017 10:23:36 -0400
Subject: [PATCH] Fix sharing of oversize text messages.

// FREEBIE
---
 src/Util/MIMETypeUtil.m | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/Util/MIMETypeUtil.m b/src/Util/MIMETypeUtil.m
index 38b829659..5c20191e2 100644
--- a/src/Util/MIMETypeUtil.m
+++ b/src/Util/MIMETypeUtil.m
@@ -289,9 +289,11 @@ NSString *const OWSMimeTypeUnknownForTests = @"unknown/mimetype";
     } else if ([self isBinaryData:contentType]) {
         return [MIMETypeUtil filePathForBinaryData:uniqueId ofMIMEType:contentType inFolder:folder];
     } else if ([contentType isEqualToString:OWSMimeTypeOversizeTextMessage]) {
-        // This file extension is arbitrary - it should never be exposed to the user or
+        // We need to use a ".txt" file extension since this file extension is used
+        // by UIActivityViewController to determine which kinds of sharing are
+        // appropriate for this text.
         // be used outside the app.
-        return [self filePathForData:uniqueId withFileExtension:@"signal-text-message" inFolder:folder];
+        return [self filePathForData:uniqueId withFileExtension:@"txt" inFolder:folder];
     } else if ([contentType isEqualToString:OWSMimeTypeUnknownForTests]) {
         // This file extension is arbitrary - it should never be exposed to the user or
         // be used outside the app.