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[mod] refactor: move Flask proxy fix to searx.flaskfix module

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This commit is contained in:
Alexandre Flament 2021-06-08 10:08:41 +02:00
parent 5c5db719d2
commit eeb0998787
2 changed files with 79 additions and 69 deletions
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77
searx/flaskfix.py Normal file
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@ -0,0 +1,77 @@
# SPDX-License-Identifier: AGPL-3.0-or-later
# lint: pylint
# pylint: disable=missing-module-docstring,missing-function-docstring
from urllib.parse import urlparse
from werkzeug.middleware.proxy_fix import ProxyFix
from werkzeug.serving import WSGIRequestHandler
from searx import settings
class ReverseProxyPathFix:
'''Wrap the application in this middleware and configure the
front-end server to add these headers, to let you quietly bind
this to a URL other than / and to an HTTP scheme that is
different than what is used locally.
http://flask.pocoo.org/snippets/35/
In nginx:
location /myprefix {
proxy_pass http://127.0.0.1:8000;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Scheme $scheme;
proxy_set_header X-Script-Name /myprefix;
}
:param wsgi_app: the WSGI application
'''
# pylint: disable=too-few-public-methods
def __init__(self, wsgi_app):
self.wsgi_app = wsgi_app
self.script_name = None
self.scheme = None
self.server = None
if settings['server']['base_url']:
# If base_url is specified, then these values from are given
# preference over any Flask's generics.
base_url = urlparse(settings['server']['base_url'])
self.script_name = base_url.path
if self.script_name.endswith('/'):
# remove trailing slash to avoid infinite redirect on the index
# see https://github.com/searx/searx/issues/2729
self.script_name = self.script_name[:-1]
self.scheme = base_url.scheme
self.server = base_url.netloc
def __call__(self, environ, start_response):
script_name = self.script_name or environ.get('HTTP_X_SCRIPT_NAME', '')
if script_name:
environ['SCRIPT_NAME'] = script_name
path_info = environ['PATH_INFO']
if path_info.startswith(script_name):
environ['PATH_INFO'] = path_info[len(script_name):]
scheme = self.scheme or environ.get('HTTP_X_SCHEME', '')
if scheme:
environ['wsgi.url_scheme'] = scheme
server = self.server or environ.get('HTTP_X_FORWARDED_HOST', '')
if server:
environ['HTTP_HOST'] = server
return self.wsgi_app(environ, start_response)
def patch_application(app):
# serve pages with HTTP/1.1
WSGIRequestHandler.protocol_version = "HTTP/{}".format(settings['server']['http_protocol_version'])
# patch app to handle non root url-s behind proxy & wsgi
app.wsgi_app = ReverseProxyPathFix(ProxyFix(app.wsgi_app))

71
searx/webapp.py
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@ -28,9 +28,6 @@ from pygments import highlight
from pygments.lexers import get_lexer_by_name
from pygments.formatters import HtmlFormatter # pylint: disable=no-name-in-module
from werkzeug.middleware.proxy_fix import ProxyFix
from werkzeug.serving import WSGIRequestHandler
import flask
from flask import (
@ -106,6 +103,7 @@ from searx.metrics import (
histogram,
counter,
)
from searx.flaskfix import patch_application
# renaming names from searx imports ...
@ -137,9 +135,6 @@ if sys.version_info[0] < 3:
logger = logger.getChild('webapp')
# serve pages with HTTP/1.1
WSGIRequestHandler.protocol_version = "HTTP/{}".format(settings['server']['http_protocol_version'])
# check secret_key
if not searx_debug and settings['server']['secret_key'] == 'ultrasecretkey':
logger.error('server.secret_key is not changed. Please use something else instead of ultrasecretkey.')
@ -1338,70 +1333,8 @@ def run():
],
)
class ReverseProxyPathFix:
'''Wrap the application in this middleware and configure the
front-end server to add these headers, to let you quietly bind
this to a URL other than / and to an HTTP scheme that is
different than what is used locally.
http://flask.pocoo.org/snippets/35/
In nginx:
location /myprefix {
proxy_pass http://127.0.0.1:8000;
proxy_set_header Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Scheme $scheme;
proxy_set_header X-Script-Name /myprefix;
}
:param wsgi_app: the WSGI application
'''
# pylint: disable=too-few-public-methods
def __init__(self, wsgi_app):
self.wsgi_app = wsgi_app
self.script_name = None
self.scheme = None
self.server = None
if settings['server']['base_url']:
# If base_url is specified, then these values from are given
# preference over any Flask's generics.
base_url = urlparse(settings['server']['base_url'])
self.script_name = base_url.path
if self.script_name.endswith('/'):
# remove trailing slash to avoid infinite redirect on the index
# see https://github.com/searx/searx/issues/2729
self.script_name = self.script_name[:-1]
self.scheme = base_url.scheme
self.server = base_url.netloc
def __call__(self, environ, start_response):
script_name = self.script_name or environ.get('HTTP_X_SCRIPT_NAME', '')
if script_name:
environ['SCRIPT_NAME'] = script_name
path_info = environ['PATH_INFO']
if path_info.startswith(script_name):
environ['PATH_INFO'] = path_info[len(script_name):]
scheme = self.scheme or environ.get('HTTP_X_SCHEME', '')
if scheme:
environ['wsgi.url_scheme'] = scheme
server = self.server or environ.get('HTTP_X_FORWARDED_HOST', '')
if server:
environ['HTTP_HOST'] = server
return self.wsgi_app(environ, start_response)
application = app
# patch app to handle non root url-s behind proxy & wsgi
app.wsgi_app = ReverseProxyPathFix(ProxyFix(application.wsgi_app))
patch_application(app)
if __name__ == "__main__":
run()