remove all attachments for user when banning user

app/services/attachment.js

@@ -183,6 +183,20 @@ class AttachmentService extends SiteService {
     return this.attachmentTemplate({ attachment, attachmentOptions });
   }
 
+  /**
+   * Removes all attachments and everything on storage about them for a
+   * specified User.
+   * @param {User} owner the owner of the attachments to be removed
+   */
+  async removeForOwner (owner) {
+    const handler = this.remove.bind(this);
+    await Attachment
+      .find({ owner: owner._id })
+      .lean()
+      .cursor()
+      .eachAsync(handler);
+  }
+
   /**
    * Creates a Bull Queue job to delete an Attachment including it's processed
    * and original media files.

app/services/user.js

@@ -821,6 +821,7 @@ class UserService extends SiteService {
 
   async ban (user) {
     const {
+      attachment: attachmentService,
       chat: chatService,
       comment: commentService,
       contentReport: contentReportService,
@@ -855,6 +856,7 @@ class UserService extends SiteService {
     await otpAuthService.removeForUser(user);
     await stickerService.removeForUser(user);
     await userNotificationService.removeForUser(user);
+    await attachmentService.removeForOwner(user);
   }
 
   checkRestrictedKeys (method, definition) {