added CORS shit

src/main.rs

@@ -1,6 +1,9 @@
 #[macro_use] extern crate rocket;
 
 use rocket::{serde::{Deserialize, json::Json}, State, http::Status};
+use rocket::http::Header;
+use rocket::{Request, Response};
+use rocket::fairing::{Fairing, Info, Kind};
 use serde_json::json;
 use std::sync::RwLock;
 
@@ -28,13 +31,13 @@ fn index() -> &'static str {
 }
 
 #[derive(Debug, Deserialize)]
-struct Request {
+struct RequestParams {
     formats: Vec<Format>,
     ids: Vec<u32>,
 }
 
-#[post("/get_url", data = "<req>")]
-async fn get_url(req: Json<Request>, state_data: &State<RwLock<StateData>>) -> (Status, String) {
+#[post("/get_url", format = "json", data = "<req>")]
+async fn get_url(req: Json<RequestParams>, state_data: &State<RwLock<StateData>>) -> (Status, String) {
     if req.formats.is_empty() {
         return (Status::BadRequest, "Format list cannot be empty".to_string());
     }
@@ -78,9 +81,34 @@ async fn get_url(req: Json<Request>, state_data: &State<RwLock<StateData>>) -> (
     (Status::Ok, media_resp.text().await.unwrap())
 }
 
+#[options("/get_url")]
+fn send_options() -> Status {
+    Status::Ok
+}
+
+pub struct CORS;
+
+#[rocket::async_trait]
+impl Fairing for CORS {
+    fn info(&self) -> Info {
+        Info {
+            name: "Add CORS headers to responses",
+            kind: Kind::Response
+        }
+    }
+
+    async fn on_response<'r>(&self, _request: &'r Request<'_>, response: &mut Response<'r>) {
+        response.set_header(Header::new("Access-Control-Allow-Origin", "*"));
+        response.set_header(Header::new("Access-Control-Allow-Methods", "POST, GET, OPTIONS"));
+        response.set_header(Header::new("Access-Control-Allow-Headers", "*"));
+        response.set_header(Header::new("Access-Control-Allow-Credentials", "true"));
+    }
+}
+
 #[launch]
 fn rocket() -> _ {
     rocket::build()
         .manage(RwLock::new(StateData { client: APIClient::new() }))
-        .mount("/", routes![index, get_url])
+        .mount("/", routes![index, get_url, send_options])
+        .attach(CORS)
 }