fix: resolve GitHub release asset API URL for private repo bundle downloads

src/specify_cli/commands/bundle/__init__.py

@@ -631,6 +631,14 @@ def catalog_remove(
     console.print(f"[green]✓[/green] Removed catalog source '{removed}'.")
 
 
+# ZIP magic-byte signatures used to detect .zip payloads from REST API asset
+# URLs, which carry no file extension.  The three signatures cover all valid
+# ZIP variants (PK\x03\x04 = local file header, PK\x05\x06 = empty archive,
+# PK\x07\x08 = spanning marker) without the false-positive risk of checking
+# only the 2-byte "PK" prefix.
+_ZIP_SIGNATURES = (b"PK\x03\x04", b"PK\x05\x06", b"PK\x07\x08")
+
+
 # ===== internal helpers =====
 
 
@@ -794,41 +802,91 @@ def _download_remote_manifest(entry_id: str, url: str):
     """Fetch a remote bundle artifact over HTTPS and extract its manifest."""
     import io
     import tempfile
+    from pathlib import PurePosixPath
+    from urllib.parse import urlparse as _urlparse
+
+    import yaml as _yaml
 
-    from ...authentication.http import open_url
+    from ...authentication.http import github_provider_hosts, open_url
+    from ..._github_http import resolve_github_release_asset_api_url
+    from ...bundler.models.manifest import BundleManifest
 
     def _validate_redirect(old_url: str, new_url: str) -> None:
         _require_https(f"bundle '{entry_id}'", new_url)
 
     _require_https(f"bundle '{entry_id}'", url)
+
+    # For private/SSO-protected GitHub repos, browser release download URLs
+    # (https://github.com/<owner>/<repo>/releases/download/<tag>/<asset>)
+    # redirect to an HTML/SSO page instead of delivering the asset.  Resolve
+    # such URLs to the GitHub REST API asset URL so the authenticated client
+    # can download the actual file.
+    extra_headers = None
+    effective_url = url
+    resolved = resolve_github_release_asset_api_url(
+        url, open_url, timeout=30, github_hosts=github_provider_hosts()
+    )
+    if resolved:
+        effective_url = resolved
+        _require_https(f"bundle '{entry_id}'", effective_url)
+        extra_headers = {"Accept": "application/octet-stream"}
+
     try:
-        with open_url(url, timeout=30, redirect_validator=_validate_redirect) as resp:
+        with open_url(
+            effective_url,
+            timeout=30,
+            redirect_validator=_validate_redirect,
+            extra_headers=extra_headers,
+        ) as resp:
             _require_https(f"bundle '{entry_id}'", resp.geturl())
             raw = resp.read()
     except BundlerError:
         raise
     except Exception as exc:  # noqa: BLE001
-        raise BundlerError(f"Failed to download bundle '{entry_id}' from {url}: {exc}") from exc
+        # Report the original catalog URL so users know which entry to fix,
+        # and include the resolved URL when it differs for easier debugging.
+        if effective_url != url:
+            msg = f"Failed to download bundle '{entry_id}' from {url} (resolved to {effective_url}): {exc}"
+        else:
+            msg = f"Failed to download bundle '{entry_id}' from {url}: {exc}"
+        raise BundlerError(msg) from exc
 
     # A .zip artifact is written to a temp file and parsed via the local-source
     # path (which extracts bundle.yml); any other payload is treated as YAML.
-    if url.lower().endswith(".zip"):
-        with tempfile.TemporaryDirectory() as tmp:
-            artifact = Path(tmp) / "bundle.zip"
-            artifact.write_bytes(raw)
-            manifest = _local_manifest_source(str(artifact))
-            if manifest is None:
-                raise BundlerError(
-                    f"Downloaded artifact for bundle '{entry_id}' is not a valid bundle."
-                )
-            return manifest
-
-    import yaml as _yaml
-
-    from ...bundler.models.manifest import BundleManifest
+    # Detection uses the path component of the original catalog URL (via
+    # PurePosixPath so query strings and fragments are ignored, and URL paths
+    # are always treated as POSIX regardless of host OS), falling back to the
+    # module-level _ZIP_SIGNATURES magic-byte check for direct REST API asset
+    # URLs which carry no file extension.
+    _url_ext = PurePosixPath(_urlparse(url).path).suffix.lower()
+    try:
+        if _url_ext == ".zip" or raw[:4] in _ZIP_SIGNATURES:
+            with tempfile.TemporaryDirectory() as tmp:
+                artifact = Path(tmp) / "bundle.zip"
+                artifact.write_bytes(raw)
+                manifest = _local_manifest_source(str(artifact))
+                # _local_manifest_source returns None only when the file does
+                # not exist; since we just wrote *artifact* that cannot happen
+                # here.  The explicit guard ensures callers never receive None
+                # and silently degrade instead of raising a clear error.
+                if manifest is None:
+                    raise BundlerError(
+                        f"Downloaded artifact for bundle '{entry_id}' is not a valid bundle."
+                    )
+                return manifest
 
-    data = _yaml.safe_load(io.BytesIO(raw))
-    return BundleManifest.from_dict(data)
+        data = _yaml.safe_load(io.BytesIO(raw))
+        return BundleManifest.from_dict(data)
+    except BundlerError:
+        raise
+    except _yaml.YAMLError as exc:
+        raise BundlerError(
+            f"Downloaded content for bundle '{entry_id}' is not valid YAML: {exc}"
+        ) from exc
+    except Exception as exc:  # noqa: BLE001
+        raise BundlerError(
+            f"Failed to parse downloaded bundle '{entry_id}': {exc}"
+        ) from exc
 
 
 def register(app: typer.Typer) -> None: