fix: prepare_msg_blob(): If cannot recode image, don't use it if it has Exif

We mustn't send images with Exif as it can leak metadata such as location, camera model, etc.

src/blob.rs

@@ -388,9 +388,12 @@ impl<'a> BlobObject<'a> {
         max_bytes: usize,
         strict_limits: bool,
     ) -> Result<Option<String>> {
-        tokio::task::block_in_place(move || {
-            let mut img = image::open(&blob_abs).context("image decode failure")?;
+        let mut no_exif = false;
+        let no_exif_ref = &mut no_exif;
+        let res = tokio::task::block_in_place(move || {
             let (nr_bytes, exif) = self.metadata()?;
+            *no_exif_ref = exif.is_none();
+            let mut img = image::open(&blob_abs).context("image decode failure")?;
             let orientation = exif.as_ref().map(|exif| exif_orientation(exif, context));
             let mut encoded = Vec::new();
             let mut changed_name = None;
@@ -505,7 +508,21 @@ impl<'a> BlobObject<'a> {
             }
 
             Ok(changed_name)
-        })
+        });
+        match res {
+            Ok(_) => res,
+            Err(err) => {
+                if !strict_limits && no_exif {
+                    warn!(
+                        context,
+                        "Cannot recode image, using original data: {err:#}.",
+                    );
+                    Ok(None)
+                } else {
+                    Err(err)
+                }
+            }
+        }
     }
 
     /// Returns image file size and Exif.

src/chat.rs

@@ -2035,13 +2035,8 @@ async fn prepare_msg_blob(context: &Context, msg: &mut Message) -> Result<()> {
 
         let mut maybe_sticker = msg.viewtype == Viewtype::Sticker;
         if msg.viewtype == Viewtype::Image || maybe_sticker {
-            // TODO: Ignore errors only if the image has no Exif.
-            if let Err(err) = blob.recode_to_image_size(context, &mut maybe_sticker).await {
-                warn!(
-                    context,
-                    "Cannot recode image, using original data: {err:#}."
-                );
-            }
+            blob.recode_to_image_size(context, &mut maybe_sticker)
+                .await?;
             if !maybe_sticker {
                 msg.viewtype = Viewtype::Image;
             }