Allow for comment deletion (#363)

* Allow for comment deletion

Receive and emit deletion activity
Add button to delete comment

* Remove debug print and fix copy-past typo

* Improve style of comment deletion button

src/inbox.rs

@@ -65,6 +65,14 @@ pub trait Inbox {
                         actor_id.as_ref(),
                         &(conn, searcher),
                     );
+                    Comment::delete_id(
+                        &act.delete_props
+                            .object_object::<Tombstone>()?
+                            .object_props
+                            .id_string()?,
+                        actor_id.as_ref(),
+                        conn,
+                    );
                     Ok(())
                 }
                 "Follow" => {

src/main.rs

@@ -91,6 +91,7 @@ fn main() {
             routes::blogs::atom_feed,
 
             routes::comments::create,
+            routes::comments::delete,
             routes::comments::activity_pub,
 
             routes::instance::index,

src/routes/comments.rs

@@ -7,7 +7,8 @@ use rocket_i18n::I18n;
 use validator::Validate;
 use template_utils::Ructe;
 
-use plume_common::{utils, activity_pub::{broadcast, ApRequest, ActivityStream}};
+use plume_common::{utils, activity_pub::{broadcast, ApRequest, 
+    ActivityStream, inbox::Deletable}};
 use plume_models::{
     blogs::Blog,
     comments::*,
@@ -86,6 +87,18 @@ pub fn create(blog_name: String, slug: String, form: LenientForm<NewCommentForm>
         })
 }
 
+#[post("/~/<blog>/<slug>/comment/<id>/delete")]
+pub fn delete(blog: String, slug: String, id: i32, user: User, conn: DbConn, worker: Worker) -> Redirect {
+    if let Some(comment) = Comment::get(&*conn, id) {
+        if comment.author_id == user.id {
+            let dest = User::one_by_instance(&*conn);
+            let delete_activity = comment.delete(&*conn);
+            worker.execute(move || broadcast(&user, delete_activity, dest));
+        }
+    }
+    Redirect::to(uri!(super::posts::details: blog = blog, slug = slug, responding_to = _))
+}
+
 #[get("/~/<_blog>/<_slug>/comment/<id>")]
 pub fn activity_pub(_blog: String, _slug: String, id: i32, _ap: ApRequest, conn: DbConn) -> Option<ActivityStream<Note>> {
     Comment::get(&*conn, id).map(|c| ActivityStream::new(c.to_activity(&*conn)))