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"""Download handlers for http and https schemes"""
from twisted.internet import reactor
from scrapy.exceptions import NotSupported
from scrapy.utils.misc import load_object
from scrapy.conf import settings
from scrapy import optional_features
ssl_supported = 'ssl' in optional_features
if ssl_supported:
from twisted.internet.ssl import ClientContextFactory
HTTPClientFactory = load_object(settings['DOWNLOADER_HTTPCLIENTFACTORY'])
class HttpDownloadHandler(object):
def __init__(self, httpclientfactory=HTTPClientFactory):
self.httpclientfactory = httpclientfactory
def download_request(self, request, spider):
"""Return a deferred for the HTTP download"""
factory = self.httpclientfactory(request)
self._connect(factory)
return factory.deferred
def _connect(self, factory):
host, port = factory.host, factory.port
if factory.scheme == 'https':
if ssl_supported:
return reactor.connectSSL(host, port, factory, \
ClientContextFactory())
raise NotSupported("HTTPS not supported: install pyopenssl library")
else:
return reactor.connectTCP(host, port, factory)
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