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# SPDX-License-Identifier: AGPL-3.0-or-later
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# lint: pylint
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# pylint: disable=missing-module-docstring
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from urllib.parse import urlparse
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from werkzeug.middleware.proxy_fix import ProxyFix
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from werkzeug.serving import WSGIRequestHandler
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from searx import settings
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class ReverseProxyPathFix:
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'''Wrap the application in this middleware and configure the
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front-end server to add these headers, to let you quietly bind
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this to a URL other than / and to an HTTP scheme that is
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different than what is used locally.
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http://flask.pocoo.org/snippets/35/
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In nginx:
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location /myprefix {
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proxy_pass http://127.0.0.1:8000;
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proxy_set_header Host $host;
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proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
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proxy_set_header X-Scheme $scheme;
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proxy_set_header X-Script-Name /myprefix;
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}
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:param wsgi_app: the WSGI application
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'''
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# pylint: disable=too-few-public-methods
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def __init__(self, wsgi_app):
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self.wsgi_app = wsgi_app
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self.script_name = None
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self.scheme = None
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self.server = None
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if settings['server']['base_url']:
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# If base_url is specified, then these values from are given
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# preference over any Flask's generics.
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base_url = urlparse(settings['server']['base_url'])
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self.script_name = base_url.path
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if self.script_name.endswith('/'):
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# remove trailing slash to avoid infinite redirect on the index
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# see https://github.com/searx/searx/issues/2729
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self.script_name = self.script_name[:-1]
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self.scheme = base_url.scheme
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self.server = base_url.netloc
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def __call__(self, environ, start_response):
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script_name = self.script_name or environ.get('HTTP_X_SCRIPT_NAME', '')
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if script_name:
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environ['SCRIPT_NAME'] = script_name
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path_info = environ['PATH_INFO']
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if path_info.startswith(script_name):
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environ['PATH_INFO'] = path_info[len(script_name):]
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scheme = self.scheme or environ.get('HTTP_X_SCHEME', '')
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if scheme:
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environ['wsgi.url_scheme'] = scheme
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server = self.server or environ.get('HTTP_X_FORWARDED_HOST', '')
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if server:
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environ['HTTP_HOST'] = server
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return self.wsgi_app(environ, start_response)
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def patch_application(app):
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# serve pages with HTTP/1.1
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WSGIRequestHandler.protocol_version = "HTTP/{}".format(settings['server']['http_protocol_version'])
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# patch app to handle non root url-s behind proxy & wsgi
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app.wsgi_app = ReverseProxyPathFix(ProxyFix(app.wsgi_app))
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