add "protection" against non-pr events

src/main.rs

@@ -1,9 +1,6 @@
 #![forbid(unsafe_code)]
 #![feature(new_uninit)]
 
-use std::mem::MaybeUninit;
-
-use gitea::PullWh;
 use log;
 use teloxide_core::{prelude::*, types::{Recipient, Chat}};
 use teloxide::Bot;
@@ -55,6 +52,26 @@ async fn webhook(mut req: Request<SharedState>) -> tide::Result {
     let body = req.body_string().await.unwrap();
     let pr = serde_json::from_str::<gitea::PullWh>(body.as_str());
 
+    let event_type = req.header("X-Gitea-Event-Type");
+    if event_type.is_none() {
+        return Ok(
+            Response::builder(400)
+                .body("{\"error\":\"no event type (X-Gitea-Event-Type)\"}")
+                .content_type("application/json")
+                .build()
+        )
+    }
+
+    let event_type = event_type.unwrap().get(0).unwrap().to_string();
+    if event_type != "pull_request" {
+        return Ok(
+            Response::builder(200)
+                .body("{\"status\":\"ignoring non-pr event\"}")
+                .content_type("application/json")
+                .build()
+        )
+    }
+
     if pr.is_err() {
         return Ok(format!("Bad serialization: {}", pr.unwrap_err().to_string()).into());
     }