feat: Add webhook endpoints for editing and deleting messages (#682)

* feat: ErrorType.CannotDeleteMessage, needed later

Signed-off-by: Taureon <taureon@noreply.codeberg.org>

* feat: webhook edit/delete message endpoints

Signed-off-by: Taureon <taureon@noreply.codeberg.org>

* lol, lmao even

Signed-off-by: Taureon <taureon@noreply.codeberg.org>

* fix contradictory comment

Signed-off-by: Taureon <taureon@noreply.codeberg.org>

---------

Signed-off-by: Taureon <taureon@noreply.codeberg.org>
Co-authored-by: Taureon <taureon@noreply.codeberg.org>

crates/delta/src/routes/webhooks/webhook_delete_message.rs

@@ -0,0 +1,27 @@
+use revolt_database::{util::reference::Reference, Database};
+use revolt_result::{create_error, Result};
+use rocket::State;
+use rocket_empty::EmptyResponse;
+
+/// # Deletes a webhook message
+///
+/// Deletes a message sent by a webhook
+#[openapi(tag = "Webhooks")]
+#[delete("/<webhook_id>/<token>/<message_id>")]
+pub async fn webhook_delete_message(
+    db: &State<Database>,
+    webhook_id: Reference<'_>,
+    token: String,
+    message_id: Reference<'_>,
+) -> Result<EmptyResponse> {
+    let webhook = webhook_id.as_webhook(db).await?;
+    webhook.assert_token(&token)?;
+
+    let message = message_id.as_message(db).await?;
+
+    if message.author != webhook.id {
+        return Err(create_error!(CannotDeleteMessage));
+    }
+
+    message.delete(db).await.map(|_| EmptyResponse)
+}