huggingface-cli upload - Validate README.md before file hashing

src/huggingface_hub/hf_api.py

@@ -3797,26 +3797,10 @@ def create_commit(
         for addition in additions:
             if addition.path_in_repo == "README.md":
                 with addition.as_file() as file:
-                    response = get_session().post(
-                        f"{ENDPOINT}/api/validate-yaml",
-                        json={"content": file.read().decode(), "repoType": repo_type},
-                        headers=headers,
-                    )
-                    # Handle warnings (example: empty metadata)
-                    response_content = response.json()
-                    message = "\n".join(
-                        [f"- {warning.get('message')}" for warning in response_content.get("warnings", [])]
-                    )
-                    if message:
-                        warnings.warn(f"Warnings while validating metadata in README.md:\n{message}")
-
-                    # Raise on errors
-                    try:
-                        hf_raise_for_status(response)
-                    except BadRequestError as e:
-                        errors = response_content.get("errors", [])
-                        message = "\n".join([f"- {error.get('message')}" for error in errors])
-                        raise ValueError(f"Invalid metadata in README.md.\n{message}") from e
+                    content = file.read().decode()
+                self._validate_yaml(content, repo_type=repo_type, token=token)
+                # Skip other additions after `README.md` has been processed
+                break
 
         # If updating twice the same file or update then delete a file in a single commit
         _warn_on_overwriting_operations(operations)
@@ -4875,11 +4859,13 @@ def upload_folder(
             path_in_repo=path_in_repo,
             delete_patterns=delete_patterns,
         )
-        add_operations = _prepare_upload_folder_additions(
+        add_operations = self._prepare_upload_folder_additions(
             folder_path,
             path_in_repo,
             allow_patterns=allow_patterns,
             ignore_patterns=ignore_patterns,
+            token=token,
+            repo_type=repo_type,
         )
 
         # Optimize operations: if some files will be overwritten, we don't need to delete them first
@@ -9182,6 +9168,84 @@ def _prepare_folder_deletions(
             if relpath_to_abspath[relpath] != ".gitattributes"
         ]
 
+    def _prepare_upload_folder_additions(
+        self,
+        folder_path: Union[str, Path],
+        path_in_repo: str,
+        allow_patterns: Optional[Union[List[str], str]] = None,
+        ignore_patterns: Optional[Union[List[str], str]] = None,
+        repo_type: Optional[str] = None,
+        token: Union[bool, str, None] = None,
+    ) -> List[CommitOperationAdd]:
+        """Generate the list of Add operations for a commit to upload a folder.
+
+        Files not matching the `allow_patterns` (allowlist) and `ignore_patterns` (denylist)
+        constraints are discarded.
+        """
+
+        folder_path = Path(folder_path).expanduser().resolve()
+        if not folder_path.is_dir():
+            raise ValueError(f"Provided path: '{folder_path}' is not a directory")
+
+        # List files from folder
+        relpath_to_abspath = {
+            path.relative_to(folder_path).as_posix(): path
+            for path in sorted(folder_path.glob("**/*"))  # sorted to be deterministic
+            if path.is_file()
+        }
+
+        # Filter files
+        # Patterns are applied on the path relative to `folder_path`. `path_in_repo` is prefixed after the filtering.
+        filtered_repo_objects = list(
+            filter_repo_objects(
+                relpath_to_abspath.keys(), allow_patterns=allow_patterns, ignore_patterns=ignore_patterns
+            )
+        )
+
+        prefix = f"{path_in_repo.strip('/')}/" if path_in_repo else ""
+
+        # If updating a README.md file, make sure the metadata format is valid
+        # It's better to fail early than to fail after all the files have been hashed.
+        for relpath in filtered_repo_objects:
+            if relpath == "README.md":
+                self._validate_yaml(
+                    content=relpath_to_abspath["README.md"].read_text(),
+                    repo_type=repo_type,
+                    token=token,
+                )
+                # Skip other additions after `README.md` has been processed
+                break
+
+        return [
+            CommitOperationAdd(
+                path_or_fileobj=relpath_to_abspath[relpath],  # absolute path on disk
+                path_in_repo=prefix + relpath,  # "absolute" path in repo
+            )
+            for relpath in filtered_repo_objects
+        ]
+
+    def _validate_yaml(self, content: str, *, repo_type: Optional[str] = None, token: Union[bool, str, None] = None):
+        headers = self._build_hf_headers(token=token)
+
+        response = get_session().post(
+            f"{ENDPOINT}/api/validate-yaml",
+            json={"content": content, "repoType": repo_type},
+            headers=headers,
+        )
+        # Handle warnings (example: empty metadata)
+        response_content = response.json()
+        message = "\n".join([f"- {warning.get('message')}" for warning in response_content.get("warnings", [])])
+        if message:
+            warnings.warn(f"Warnings while validating metadata in README.md:\n{message}")
+
+        # Raise on errors
+        try:
+            hf_raise_for_status(response)
+        except BadRequestError as e:
+            errors = response_content.get("errors", [])
+            message = "\n".join([f"- {error.get('message')}" for error in errors])
+            raise ValueError(f"Invalid metadata in README.md.\n{message}") from e
+
     def get_user_overview(self, username: str) -> User:
         """
         Get an overview of a user on the Hub.
@@ -9275,42 +9339,6 @@ def list_user_following(self, username: str) -> Iterable[User]:
             yield User(**followed_user)
 
 
-def _prepare_upload_folder_additions(
-    folder_path: Union[str, Path],
-    path_in_repo: str,
-    allow_patterns: Optional[Union[List[str], str]] = None,
-    ignore_patterns: Optional[Union[List[str], str]] = None,
-) -> List[CommitOperationAdd]:
-    """Generate the list of Add operations for a commit to upload a folder.
-
-    Files not matching the `allow_patterns` (allowlist) and `ignore_patterns` (denylist)
-    constraints are discarded.
-    """
-    folder_path = Path(folder_path).expanduser().resolve()
-    if not folder_path.is_dir():
-        raise ValueError(f"Provided path: '{folder_path}' is not a directory")
-
-    # List files from folder
-    relpath_to_abspath = {
-        path.relative_to(folder_path).as_posix(): path
-        for path in sorted(folder_path.glob("**/*"))  # sorted to be deterministic
-        if path.is_file()
-    }
-
-    # Filter files and return
-    # Patterns are applied on the path relative to `folder_path`. `path_in_repo` is prefixed after the filtering.
-    prefix = f"{path_in_repo.strip('/')}/" if path_in_repo else ""
-    return [
-        CommitOperationAdd(
-            path_or_fileobj=relpath_to_abspath[relpath],  # absolute path on disk
-            path_in_repo=prefix + relpath,  # "absolute" path in repo
-        )
-        for relpath in filter_repo_objects(
-            relpath_to_abspath.keys(), allow_patterns=allow_patterns, ignore_patterns=ignore_patterns
-        )
-    ]
-
-
 def _parse_revision_from_pr_url(pr_url: str) -> str:
     """Safely parse revision number from a PR url.