Change /reblog method to return repost info instead of original post

This is done to comply with Mastodon API spec.

docs/openapi.yaml

@@ -434,13 +434,27 @@ paths:
         - $ref: '#/components/parameters/status_id'
       responses:
         200:
-          description: Successful operation
+          description: Successful operation. Returns repost info.
           content:
             application/json:
               schema:
                 $ref: '#/components/schemas/Status'
         404:
           description: Post does not exist or is not public
+  /api/v1/statuses/{status_id}/unreblog:
+    post:
+      summary: Undo repost
+      parameters:
+        - $ref: '#/components/parameters/status_id'
+      responses:
+        200:
+          description: Post no longer resposted.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/Status'
+        404:
+          description: Post does not exist or no repost exists
   /api/v1/statuses/{status_id}/make_permanent:
     post:
       summary: Save post to IPFS

src/mastodon_api/statuses/views.rs

@@ -316,7 +316,7 @@ async fn reblog(
         repost_of_id: Some(status_id),
         ..Default::default()
     };
-    let repost = create_post(db_client, &current_user.id, repost_data).await?;
+    let mut repost = create_post(db_client, &current_user.id, repost_data).await?;
     post.repost_count += 1;
     get_reposted_posts(db_client, vec![&mut post]).await?;
     get_actions_for_posts(db_client, &current_user.id, vec![&mut post]).await?;
@@ -332,7 +332,8 @@ async fn reblog(
     );
     deliver_activity(&config, &current_user, activity, recipients);
 
-    let status = Status::from_post(post, &config.instance_url());
+    repost.repost_of = Some(Box::new(post));
+    let status = Status::from_post(repost, &config.instance_url());
     Ok(HttpResponse::Ok().json(status))
 }