47 lines
1.9 KiB
Python
47 lines
1.9 KiB
Python
# Copyright 2019 The TensorFlow Authors. All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# ==============================================================================
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"""Redirect from an empty path to the virtual application root.
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Sometimes, middleware transformations will make the path empty: for
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example, navigating to "/foo" (no trailing slash) when the path prefix
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is exactly "/foo". In such cases, relative links on the frontend would
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break. Instead of handling this special case in each relevant
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middleware, we install a top-level redirect handler from "" to "/".
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This middleware respects `SCRIPT_NAME` as described by the WSGI spec. If
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`SCRIPT_NAME` is set to "/foo", then an empty `PATH_INFO` corresponds to
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the actual path "/foo", and so will be redirected to "/foo/".
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"""
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class EmptyPathRedirectMiddleware:
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"""WSGI middleware to redirect from "" to "/"."""
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def __init__(self, application):
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"""Initializes this middleware.
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Args:
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application: The WSGI application to wrap (see PEP 3333).
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"""
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self._application = application
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def __call__(self, environ, start_response):
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path = environ.get("PATH_INFO", "")
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if path:
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return self._application(environ, start_response)
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location = environ.get("SCRIPT_NAME", "") + "/"
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start_response("301 Moved Permanently", [("Location", location)])
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return []
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