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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 import signals
class HttpAuthMiddleware(object):
"""Set Basic HTTP Authorization header
(http_user and http_pass spider class attributes)"""
@classmethod
def from_crawler(cls, crawler):
o = cls()
crawler.signals.connect(o.spider_opened, signal=signals.spider_opened)
return o
def spider_opened(self, spider):
usr = getattr(spider, 'http_user', '')
pwd = getattr(spider, 'http_pass', '')
if usr or pwd:
self.auth = basic_auth_header(usr, pwd)
def process_request(self, request, spider):
auth = getattr(self, 'auth', None)
if auth and 'Authorization' not in request.headers:
request.headers['Authorization'] = auth
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