Partially implement GIFs

src/org/thoughtcrime/securesms/database/AttachmentDatabase.java

@@ -739,7 +739,12 @@ public class AttachmentDatabase extends Database {
 
     if (thumbnailUri != null) {
       try (InputStream attachmentStream = PartAuthority.getAttachmentStream(context, thumbnailUri)) {
-        Pair<Integer, Integer> dimens = BitmapUtil.getDimensions(attachmentStream);
+        Pair<Integer, Integer> dimens;
+        if (attachment.getContentType().equals(MediaUtil.IMAGE_GIF)) {
+          dimens = new Pair<>(attachment.getWidth(), attachment.getHeight());
+        } else {
+          dimens = BitmapUtil.getDimensions(attachmentStream);
+        }
         updateAttachmentThumbnail(attachmentId,
                                   PartAuthority.getAttachmentStream(context, thumbnailUri),
                                   (float) dimens.first / (float) dimens.second);

src/org/thoughtcrime/securesms/jobs/PushDecryptJob.java

@@ -978,6 +978,23 @@ public class PushDecryptJob extends BaseJob implements InjectableType {
             }
           }));
         }
+      } if (LinkPreviewUtil.isWhitelistedMediaUrl(body)) {
+        new LinkPreviewRepository(context).fetchGIF(context, body, attachmentOrNull -> Util.runOnMain(() -> {
+          if (attachmentOrNull.isPresent()) {
+            Attachment attachment = attachmentOrNull.get();
+            try {
+              IncomingMediaMessage mediaMessage = new IncomingMediaMessage(Address.fromExternal(context, content.getSender()), message.getTimestamp(), -1,
+                 message.getExpiresInSeconds() * 1000L, false, content.isNeedsReceipt(), message.getBody(), message.getGroupInfo(), Optional.of(new ArrayList<>()),
+                  Optional.absent(), Optional.absent(), Optional.absent(), Optional.absent());
+              mediaMessage.getAttachments().add(attachment);
+              handleMediaMessage(content, mediaMessage, smsMessageId, messageServerIDOrNull);
+            } catch (Exception e) {
+              // TODO: Handle
+            }
+          } else {
+            // TODO: Handle
+          }
+        }));
       } else {
         Optional<InsertResult> insertResult = database.insertMessageInbox(textMessage);
 

src/org/thoughtcrime/securesms/linkpreview/LinkPreviewDomains.java

@@ -33,6 +33,7 @@ public class LinkPreviewDomains {
       "redd.it",
       "imgur.com",
       "pinimg.com",
-      "giphy.com"
+      "giphy.com",
+      "tenor.com"
   ));
 }

src/org/thoughtcrime/securesms/linkpreview/LinkPreviewRepository.java

@@ -8,6 +8,7 @@ import android.text.Html;
 import android.text.TextUtils;
 
 import com.bumptech.glide.load.engine.DiskCacheStrategy;
+import com.bumptech.glide.load.resource.gif.GifDrawable;
 import com.bumptech.glide.request.FutureTarget;
 
 import org.thoughtcrime.securesms.ApplicationContext;
@@ -150,6 +151,29 @@ public class LinkPreviewRepository implements InjectableType {
     return new CallRequestController(call);
   }
 
+  public @NonNull RequestController fetchGIF(@NonNull Context context, @NonNull String url, @NonNull Callback<Optional<Attachment>> callback) {
+    FutureTarget<GifDrawable> future = GlideApp.with(context).asGif().load(new ChunkedImageUrl(url)).skipMemoryCache(true).diskCacheStrategy(DiskCacheStrategy.NONE)
+      .centerInside().submit(1024, 1024);
+    RequestController controller = () -> future.cancel(false);
+    SignalExecutors.UNBOUNDED.execute(() -> {
+      try {
+        GifDrawable gif = future.get();
+        byte[] bytes = new byte[gif.getBuffer().remaining()];
+        gif.getBuffer().get(bytes);
+        Uri uri = BlobProvider.getInstance().forData(bytes).createForSingleSessionInMemory();
+        Optional<Attachment> thumbnail = Optional.of(new UriAttachment(uri, uri, MediaUtil.IMAGE_GIF, AttachmentDatabase.TRANSFER_PROGRESS_DONE,
+          bytes.length, gif.getIntrinsicWidth(), gif.getIntrinsicHeight(), null, null, false, false, null, null));
+        callback.onComplete(thumbnail);
+      } catch (CancellationException | ExecutionException | InterruptedException e) {
+        controller.cancel();
+        callback.onComplete(Optional.absent());
+      } finally {
+        future.cancel(false);
+      }
+    });
+    return () -> future.cancel(true);
+  }
+
   private @NonNull RequestController fetchThumbnail(@NonNull Context context, @NonNull String imageUrl, @NonNull Callback<Optional<Attachment>> callback) {
     FutureTarget<Bitmap> bitmapFuture = GlideApp.with(context).asBitmap()
                                                               .load(new ChunkedImageUrl(imageUrl))