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# -*- coding: utf-8 -*-
# http.py
# Copyright (C) 2015 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Twisted HTTP/HTTPS client.
"""
try:
import twisted
except ImportError:
print "*******"
print "Twisted is needed to use leap.common.http module"
print ""
print "Install the extra requirement of the package:"
print "$ pip install leap.common[Twisted]"
import sys
sys.exit(1)
from leap.common.certs import get_compatible_ssl_context_factory
from zope.interface import implements
from twisted.internet import reactor
from twisted.internet.defer import succeed
from twisted.web.client import Agent
from twisted.web.client import HTTPConnectionPool
from twisted.web.client import readBody
from twisted.web.http_headers import Headers
from twisted.web.iweb import IBodyProducer
class HTTPClient(object):
"""
HTTP client done the twisted way, with a main focus on pinning the SSL
certificate.
"""
def __init__(self, cert_file=None):
"""
Init the HTTP client
:param cert_file: The path to the certificate file, if None given the
system's CAs will be used.
:type cert_file: str
"""
self._pool = HTTPConnectionPool(reactor, persistent=True)
self._pool.maxPersistentPerHost = 10
policy = get_compatible_ssl_context_factory(cert_file)
self._agent = Agent(
reactor,
policy,
pool=self._pool)
def request(self, url, method='GET', body=None, headers={}):
"""
Perform an HTTP request.
:param url: The URL for the request.
:type url: str
:param method: The HTTP method of the request.
:type method: str
:param body: The body of the request, if any.
:type body: str
:param headers: The headers of the request.
:type headers: dict
:return: A deferred that fires with the body of the request.
:rtype: twisted.internet.defer.Deferred
"""
if body:
body = HTTPClient.StringBodyProducer(body)
d = self._agent.request(
method, url, headers=Headers(headers), bodyProducer=body)
d.addCallback(readBody)
return d
class StringBodyProducer(object):
"""
A producer that writes the body of a request to a consumer.
"""
implements(IBodyProducer)
def __init__(self, body):
"""
Initialize the string produer.
:param body: The body of the request.
:type body: str
"""
self.body = body
self.length = len(body)
def startProducing(self, consumer):
"""
Write the body to the consumer.
:param consumer: Any IConsumer provider.
:type consumer: twisted.internet.interfaces.IConsumer
:return: A successful deferred.
:rtype: twisted.internet.defer.Deferred
"""
consumer.write(self.body)
return succeed(None)
def pauseProducing(self):
pass
def stopProducing(self):
pass
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