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middlewares.py
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# Copyright (C) 2018 The Software Heritage developers
# See the AUTHORS file at the top-level directory of this distribution
# License: GNU Affero General Public License version 3, or any later version
# See top-level LICENSE file for more information
from bs4 import BeautifulSoup
from htmlmin import minify
class HtmlPrettifyMiddleware(object):
"""
Django middleware for prettifying generated HTML in
development mode.
"""
def __init__(self, get_response):
self.get_response = get_response
def __call__(self, request):
response = self.get_response(request)
if 'text/html' in response.get('Content-Type', ''):
response.content = \
BeautifulSoup(response.content, 'lxml').prettify()
return response
class HtmlMinifyMiddleware(object):
"""
Django middleware for minifying generated HTML in
production mode.
"""
def __init__(self, get_response=None):
self.get_response = get_response
def __call__(self, request):
response = self.get_response(request)
if 'text/html' in response.get('Content-Type', ''):
try:
minified_html = minify(response.content.decode('utf-8'),
convert_charrefs=False)
response.content = minified_html.encode('utf-8')
except Exception:
pass
return response
class ThrottlingHeadersMiddleware(object):
"""
Django middleware for inserting rate limiting related
headers in HTTP response.
"""
def __init__(self, get_response=None):
self.get_response = get_response
def __call__(self, request):
resp = self.get_response(request)
if 'RateLimit-Limit' in request.META:
resp['X-RateLimit-Limit'] = request.META['RateLimit-Limit']
if 'RateLimit-Remaining' in request.META:
resp['X-RateLimit-Remaining'] = request.META['RateLimit-Remaining']
if 'RateLimit-Reset' in request.META:
resp['X-RateLimit-Reset'] = request.META['RateLimit-Reset']
return resp

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