hive-forge: carry the HTTP status structurally instead of flattening it to a string

hive-forge/src/client.rs

@@ -483,22 +483,59 @@ fn disposition_filename(value: &str) -> Option<String> {
     (!name.is_empty()).then(|| name.to_owned())
 }
 
-/// Surface non-2xx HTTP responses on the raw web routes as anyhow
-/// errors with the response body included (matches `curl
+/// A non-2xx HTTP response from one of the raw *web-router* calls
+/// (`post_json_web` / `get_bytes_raw` / `get_api_json`), carrying the
+/// status code and body as data rather than baking them into a
+/// formatted message. Without this, a caller that needs to tell "gone"
+/// (404, or a 500 wrapping "resource does not exist") apart from "not
+/// permitted" (401/403) has no honest way to do it — the status is read
+/// once by [`check_status`] and then discarded into prose. A caller
+/// that needs the code back gets it with
+/// `err.downcast_ref::<WebStatusError>()` on the `anyhow::Error`
+/// `post_json_web` et al return; `None` means the failure wasn't a
+/// non-2xx response at all (transport, JSON decode, ...), so still
+/// fall through to a generic message rather than assuming success.
+#[derive(Debug)]
+pub struct WebStatusError {
+    pub op: String,
+    pub status: reqwest::StatusCode,
+    pub body: String,
+}
+
+impl std::fmt::Display for WebStatusError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(
+            f,
+            "hive-forge: {} failed ({}): {}",
+            self.op, self.status, self.body
+        )
+    }
+}
+
+impl std::error::Error for WebStatusError {}
+
+/// Surface non-2xx HTTP responses on the raw web routes as a
+/// [`WebStatusError`] with the response body included (matches `curl
 /// --fail-with-body`) — turns silent failures into errors with a
-/// clear message.
+/// clear message, while keeping the status code available structurally
+/// instead of only as formatted text.
 fn check_status(resp: Response, op: &str) -> Result<Response> {
     let status = resp.status();
     if status.is_success() {
         return Ok(resp);
     }
     let body = resp.text().unwrap_or_default();
-    bail!("hive-forge: {op} failed ({status}): {body}");
+    Err(WebStatusError {
+        op: op.to_owned(),
+        status,
+        body,
+    }
+    .into())
 }
 
 #[cfg(test)]
 mod tests {
-    use super::{disposition_filename, index, owner_repo_from_git_url, split_repo};
+    use super::{WebStatusError, disposition_filename, index, owner_repo_from_git_url, split_repo};
 
     #[test]
     fn disposition_filename_reads_forgejos_real_header() {
@@ -528,6 +565,24 @@ mod tests {
         assert_eq!(disposition_filename("attachment; filename=\"\""), None);
     }
 
+    #[test]
+    fn web_status_error_downcasts_to_recover_the_status_code() {
+        let err: anyhow::Error = WebStatusError {
+            op: "GET https://example.invalid/x".to_owned(),
+            status: reqwest::StatusCode::NOT_FOUND,
+            body: "resource does not exist".to_owned(),
+        }
+        .into();
+        let status = err.downcast_ref::<WebStatusError>().map(|e| e.status);
+        assert_eq!(status, Some(reqwest::StatusCode::NOT_FOUND));
+    }
+
+    #[test]
+    fn unrelated_errors_do_not_downcast_to_web_status_error() {
+        let err = anyhow::anyhow!("connection refused");
+        assert!(err.downcast_ref::<WebStatusError>().is_none());
+    }
+
     #[test]
     fn owner_repo_from_git_url_strips_scheme_and_creds() {
         assert_eq!(