Add image proxy.

src/main.rs

@@ -6,8 +6,12 @@ pub mod util;
 
 #[actix_web::main]
 async fn main() -> std::io::Result<()> {
-    HttpServer::new(|| App::new().route("/embed", web::get().to(routes::embed::get)))
-        .bind(("127.0.0.1", 3000))?
-        .run()
-        .await
+    HttpServer::new(|| {
+        App::new()
+            .route("/embed", web::get().to(routes::embed::get))
+            .route("/proxy", web::get().to(routes::proxy::get))
+    })
+    .bind(("127.0.0.1", 3000))?
+    .run()
+    .await
 }

src/routes/mod.rs

 pub mod embed;
+pub mod proxy;

src/routes/proxy.rs

+use actix_web::{HttpResponse, Responder, web::Query};
+use serde::Deserialize;
+
+use crate::util::request::fetch;
+use crate::util::result::Error;
+
+#[derive(Deserialize)]
+pub struct Parameters {
+    url: String,
+}
+
+pub async fn get(info: Query<Parameters>) -> Result<impl Responder, Error> {
+    let url = info.into_inner().url;
+    let (resp, mime) = fetch(&url).await?;
+
+    if let mime::IMAGE = mime.type_() {
+        let body = resp.bytes().await.map_err(|_| Error::LabelMe)?;
+        Ok(
+            HttpResponse::Ok()
+                .body(body)
+        )
+    } else {
+        Err(Error::LabelMe)
+    }
+}