fixes

apps/ios/SimpleXChat/ImageUtils.swift

@@ -319,7 +319,7 @@ private func getTimestamp() -> String {
 }
 
 public func dropImagePrefix(_ s: String) -> String {
-    dropPrefix(dropPrefix(s, "data:image/png;base64,"), "data:image/jpg;base64,")
+    dropPrefix(dropPrefix(dropPrefix(s, "data:image/png;base64,"), "data:image/jpg;base64,"), "data:image/jpeg;base64,")
 }
 
 private func dropPrefix(_ s: String, _ prefix: String) -> String {

src/Simplex/Chat/Image.hs

@@ -52,7 +52,7 @@ resizeImageToSize toURI maxSize (ResizeableImage fmt img encoder) = either resiz
       | otherwise = fitQuality 33 99
       where
         encode q
-          | toURI = toDataUri "jpeg" $ enc q img
+          | toURI = toDataUri "jpg" $ enc q img -- the correct mime type is "jpeg", but only "jpg" is supported by older clients
           | otherwise = enc q img
         minSize = LB.length $ encode 33
         fitQuality l u

tests/LinkPreviewTests.hs

@@ -20,8 +20,8 @@ linkPreviewTests = do
 resizeToStrTest :: FilePath -> FilePath -> IO ()
 resizeToStrTest inputPath tmp = do
   (ri@(ResizeableImage imgFormat _img encoder), metadata) <- either error pure =<< Image.readResizeable inputPath
-  logDebug $ tshow (metadata, imgFormat, either (const "png") (const "jpeg") encoder)
-  let res = Image.resizeImageToStrSize maxSize ri
+  logDebug $ tshow (metadata, imgFormat, either (const "png") (const "jpg") encoder)
+  let res = Image.resizeImageToSize True maxSize ri
       finalSize = LB.length res
   unless (finalSize <= maxSize) $ error $ "Final size larger than maximum size: " <> show (finalSize, maxSize)
   let (fmt, b64) = fmap (LB.drop 8) . LB.break (== ';') $ LB.drop 11 res