Add mediaType property to images in actor object

CHANGELOG.md

@@ -18,6 +18,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 - Save downloaded media as "unknown" if its media type is not supported.
 - Use `mediaType` property value to determine file extension when saving downloaded media.
+- Added `mediaType` property to images in actor object.
 
 ### Removed
 

src/activitypub/actors/types.rs

@@ -241,7 +241,7 @@ pub fn get_local_actor(
             let actor_image = ActorImage {
                 object_type: IMAGE.to_string(),
                 url: get_file_url(instance_url, &image.file_name),
-                media_type: None,
+                media_type: image.media_type.clone(),
             };
             Some(actor_image)
         },
@@ -252,7 +252,7 @@ pub fn get_local_actor(
             let actor_image = ActorImage {
                 object_type: IMAGE.to_string(),
                 url: get_file_url(instance_url, &image.file_name),
-                media_type: None,
+                media_type: image.media_type.clone(),
             };
             Some(actor_image)
         },