hanime thumbnail fix

src/proxies/hanimecdn.rs

@@ -6,12 +6,24 @@ use ntex::{
 
 use crate::util::requester::Requester;
 
+fn normalize_image_url(endpoint: &str) -> String {
+    let endpoint = endpoint.trim_start_matches('/');
+
+    if endpoint.starts_with("http://") || endpoint.starts_with("https://") {
+        endpoint.to_string()
+    } else if endpoint.starts_with("hanime-cdn.com/") || endpoint == "hanime-cdn.com" {
+        format!("https://{endpoint}")
+    } else {
+        format!("https://hanime-cdn.com/{endpoint}")
+    }
+}
+
 pub async fn get_image(
     req: HttpRequest,
     requester: web::types::State<Requester>,
 ) -> Result<impl web::Responder, web::Error> {
     let endpoint = req.match_info().query("endpoint").to_string();
-    let image_url = format!("https://hanime-cdn.com/{}", endpoint);
+    let image_url = normalize_image_url(&endpoint);
 
     let upstream = match requester
         .get_ref()
@@ -52,3 +64,24 @@ pub async fn get_image(
     // ...or simple & compatible:
     Ok(resp.body(bytes.to_vec()))
 }
+
+#[cfg(test)]
+mod tests {
+    use super::normalize_image_url;
+
+    #[test]
+    fn keeps_full_hanime_cdn_host_path_without_duplication() {
+        assert_eq!(
+            normalize_image_url("hanime-cdn.com/images/covers/natsu-zuma-2-cv1.png"),
+            "https://hanime-cdn.com/images/covers/natsu-zuma-2-cv1.png"
+        );
+    }
+
+    #[test]
+    fn prefixes_relative_paths_with_hanime_cdn_host() {
+        assert_eq!(
+            normalize_image_url("/images/covers/natsu-zuma-2-cv1.png"),
+            "https://hanime-cdn.com/images/covers/natsu-zuma-2-cv1.png"
+        );
+    }
+}