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| # Copyright 2019 The TensorFlow Authors. All Rights Reserved. | |
| # | |
| # Licensed under the Apache License, Version 2.0 (the "License"); | |
| # you may not use this file except in compliance with the License. | |
| # You may obtain a copy of the License at | |
| # | |
| # http://www.apache.org/licenses/LICENSE-2.0 | |
| # | |
| # Unless required by applicable law or agreed to in writing, software | |
| # distributed under the License is distributed on an "AS IS" BASIS, | |
| # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| # See the License for the specific language governing permissions and | |
| # limitations under the License. | |
| # ============================================================================== | |
| """Internal path prefix support for TensorBoard. | |
| Using a path prefix of `/foo/bar` enables TensorBoard to serve from | |
| `http://localhost:6006/foo/bar/` rather than `http://localhost:6006/`. | |
| See the `--path_prefix` flag docs for more details. | |
| """ | |
| from tensorboard import errors | |
| class PathPrefixMiddleware: | |
| """WSGI middleware for path prefixes. | |
| All requests to this middleware must begin with the specified path | |
| prefix (otherwise, a 404 will be returned immediately). Requests | |
| will be forwarded to the underlying application with the path prefix | |
| stripped and appended to `SCRIPT_NAME` (see the WSGI spec, PEP 3333, | |
| for details). | |
| """ | |
| def __init__(self, application, path_prefix): | |
| """Initializes this middleware. | |
| Args: | |
| application: The WSGI application to wrap (see PEP 3333). | |
| path_prefix: A string path prefix to be stripped from incoming | |
| requests. If empty, this middleware is a no-op. If non-empty, | |
| the path prefix must start with a slash and not end with one | |
| (e.g., "/tensorboard"). | |
| """ | |
| if path_prefix.endswith("/"): | |
| raise ValueError( | |
| "Path prefix must not end with slash: %r" % path_prefix | |
| ) | |
| if path_prefix and not path_prefix.startswith("/"): | |
| raise ValueError( | |
| "Non-empty path prefix must start with slash: %r" % path_prefix | |
| ) | |
| self._application = application | |
| self._path_prefix = path_prefix | |
| self._strict_prefix = self._path_prefix + "/" | |
| def __call__(self, environ, start_response): | |
| path = environ.get("PATH_INFO", "") | |
| if path != self._path_prefix and not path.startswith( | |
| self._strict_prefix | |
| ): | |
| raise errors.NotFoundError() | |
| environ["PATH_INFO"] = path[len(self._path_prefix) :] | |
| environ["SCRIPT_NAME"] = ( | |
| environ.get("SCRIPT_NAME", "") + self._path_prefix | |
| ) | |
| return self._application(environ, start_response) | |