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"""
HTTP basic auth downloader middleware
See documentation in docs/topics/downloader-middleware.rst
"""
from w3lib.http import basic_auth_header
from scrapy.utils.python import WeakKeyCache
class HttpAuthMiddleware(object):
"""Set Basic HTTP Authorization header
(http_user and http_pass spider class attributes)"""
def __init__(self):
self._cache = WeakKeyCache(self._authorization)
def _authorization(self, spider):
usr = getattr(spider, 'http_user', '')
pwd = getattr(spider, 'http_pass', '')
if usr or pwd:
return basic_auth_header(usr, pwd)
def process_request(self, request, spider):
auth = self._cache[spider]
if auth and 'Authorization' not in request.headers:
request.headers['Authorization'] = auth
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