502 lines
17 KiB
Python
502 lines
17 KiB
Python
# -*- coding: utf-8 -*-
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"""
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requests.session
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~~~~~~~~~~~~~~~~
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This module provides a Session object to manage and persist settings across
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requests (cookies, auth, proxies).
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"""
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import os
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from collections import Mapping
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from datetime import datetime
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from .compat import cookielib, OrderedDict, urljoin, urlparse
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from .cookies import cookiejar_from_dict, extract_cookies_to_jar, RequestsCookieJar
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from .models import Request, PreparedRequest
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from .hooks import default_hooks, dispatch_hook
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from .utils import to_key_val_list, default_headers
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from .exceptions import TooManyRedirects, InvalidSchema
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from .structures import CaseInsensitiveDict
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from .adapters import HTTPAdapter
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from .utils import requote_uri, get_environ_proxies, get_netrc_auth
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from .status_codes import codes
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REDIRECT_STATI = (
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codes.moved, # 301
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codes.found, # 302
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codes.other, # 303
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codes.temporary_moved, # 307
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)
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DEFAULT_REDIRECT_LIMIT = 30
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def merge_setting(request_setting, session_setting, dict_class=OrderedDict):
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"""
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Determines appropriate setting for a given request, taking into account the
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explicit setting on that request, and the setting in the session. If a
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setting is a dictionary, they will be merged together using `dict_class`
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"""
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if session_setting is None:
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return request_setting
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if request_setting is None:
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return session_setting
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# Bypass if not a dictionary (e.g. verify)
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if not (
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isinstance(session_setting, Mapping) and
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isinstance(request_setting, Mapping)
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):
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return request_setting
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merged_setting = dict_class(to_key_val_list(session_setting))
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merged_setting.update(to_key_val_list(request_setting))
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# Remove keys that are set to None.
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for (k, v) in request_setting.items():
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if v is None:
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del merged_setting[k]
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return merged_setting
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class SessionRedirectMixin(object):
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def resolve_redirects(self, resp, req, stream=False, timeout=None,
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verify=True, cert=None, proxies=None):
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"""Receives a Response. Returns a generator of Responses."""
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i = 0
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prepared_request = PreparedRequest()
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prepared_request.body = req.body
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prepared_request.headers = req.headers.copy()
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prepared_request.hooks = req.hooks
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prepared_request.method = req.method
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prepared_request.url = req.url
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# ((resp.status_code is codes.see_other))
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while (('location' in resp.headers and resp.status_code in REDIRECT_STATI)):
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resp.content # Consume socket so it can be released
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if i >= self.max_redirects:
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raise TooManyRedirects('Exceeded %s redirects.' % self.max_redirects)
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# Release the connection back into the pool.
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resp.close()
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url = resp.headers['location']
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method = prepared_request.method
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# Handle redirection without scheme (see: RFC 1808 Section 4)
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if url.startswith('//'):
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parsed_rurl = urlparse(resp.url)
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url = '%s:%s' % (parsed_rurl.scheme, url)
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# Facilitate non-RFC2616-compliant 'location' headers
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# (e.g. '/path/to/resource' instead of 'http://domain.tld/path/to/resource')
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# Compliant with RFC3986, we percent encode the url.
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if not urlparse(url).netloc:
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url = urljoin(resp.url, requote_uri(url))
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else:
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url = requote_uri(url)
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prepared_request.url = url
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# http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.4
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if (resp.status_code == codes.see_other and
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prepared_request.method != 'HEAD'):
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method = 'GET'
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# Do what the browsers do, despite standards...
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if (resp.status_code in (codes.moved, codes.found) and
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prepared_request.method not in ('GET', 'HEAD')):
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method = 'GET'
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prepared_request.method = method
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# https://github.com/kennethreitz/requests/issues/1084
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if resp.status_code not in (codes.temporary, codes.resume):
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if 'Content-Length' in prepared_request.headers:
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del prepared_request.headers['Content-Length']
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prepared_request.body = None
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headers = prepared_request.headers
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try:
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del headers['Cookie']
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except KeyError:
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pass
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prepared_request.prepare_cookies(self.cookies)
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resp = self.send(
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prepared_request,
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stream=stream,
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timeout=timeout,
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verify=verify,
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cert=cert,
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proxies=proxies,
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allow_redirects=False,
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)
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extract_cookies_to_jar(self.cookies, prepared_request, resp.raw)
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i += 1
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yield resp
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class Session(SessionRedirectMixin):
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"""A Requests session.
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Provides cookie persistience, connection-pooling, and configuration.
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Basic Usage::
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>>> import requests
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>>> s = requests.Session()
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>>> s.get('http://httpbin.org/get')
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200
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"""
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__attrs__ = [
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'headers', 'cookies', 'auth', 'timeout', 'proxies', 'hooks',
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'params', 'verify', 'cert', 'prefetch', 'adapters', 'stream',
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'trust_env', 'max_redirects']
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def __init__(self):
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#: A case-insensitive dictionary of headers to be sent on each
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#: :class:`Request <Request>` sent from this
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#: :class:`Session <Session>`.
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self.headers = default_headers()
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#: Default Authentication tuple or object to attach to
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#: :class:`Request <Request>`.
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self.auth = None
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#: Dictionary mapping protocol to the URL of the proxy (e.g.
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#: {'http': 'foo.bar:3128'}) to be used on each
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#: :class:`Request <Request>`.
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self.proxies = {}
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#: Event-handling hooks.
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self.hooks = default_hooks()
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#: Dictionary of querystring data to attach to each
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#: :class:`Request <Request>`. The dictionary values may be lists for
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#: representing multivalued query parameters.
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self.params = {}
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#: Stream response content default.
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self.stream = False
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#: SSL Verification default.
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self.verify = True
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#: SSL certificate default.
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self.cert = None
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#: Maximum number of redirects allowed. If the request exceeds this
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#: limit, a :class:`TooManyRedirects` exception is raised.
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self.max_redirects = DEFAULT_REDIRECT_LIMIT
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#: Should we trust the environment?
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self.trust_env = True
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# Set up a CookieJar to be used by default
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self.cookies = cookiejar_from_dict({})
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# Default connection adapters.
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self.adapters = OrderedDict()
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self.mount('https://', HTTPAdapter())
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self.mount('http://', HTTPAdapter())
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def __enter__(self):
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return self
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def __exit__(self, *args):
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self.close()
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def request(self, method, url,
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params=None,
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data=None,
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headers=None,
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cookies=None,
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files=None,
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auth=None,
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timeout=None,
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allow_redirects=True,
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proxies=None,
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hooks=None,
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stream=None,
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verify=None,
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cert=None):
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"""Constructs a :class:`Request <Request>`, prepares it and sends it.
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Returns :class:`Response <Response>` object.
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:param method: method for the new :class:`Request` object.
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:param url: URL for the new :class:`Request` object.
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:param params: (optional) Dictionary or bytes to be sent in the query
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string for the :class:`Request`.
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:param data: (optional) Dictionary or bytes to send in the body of the
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:class:`Request`.
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:param headers: (optional) Dictionary of HTTP Headers to send with the
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:class:`Request`.
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:param cookies: (optional) Dict or CookieJar object to send with the
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:class:`Request`.
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:param files: (optional) Dictionary of 'filename': file-like-objects
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for multipart encoding upload.
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:param auth: (optional) Auth tuple or callable to enable
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Basic/Digest/Custom HTTP Auth.
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:param timeout: (optional) Float describing the timeout of the
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request.
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:param allow_redirects: (optional) Boolean. Set to True by default.
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:param proxies: (optional) Dictionary mapping protocol to the URL of
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the proxy.
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:param stream: (optional) whether to immediately download the response
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content. Defaults to ``False``.
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:param verify: (optional) if ``True``, the SSL cert will be verified.
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A CA_BUNDLE path can also be provided.
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:param cert: (optional) if String, path to ssl client cert file (.pem).
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If Tuple, ('cert', 'key') pair.
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"""
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cookies = cookies or {}
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proxies = proxies or {}
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# Bootstrap CookieJar.
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if not isinstance(cookies, cookielib.CookieJar):
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cookies = cookiejar_from_dict(cookies)
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# Merge with session cookies
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merged_cookies = RequestsCookieJar()
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merged_cookies.update(self.cookies)
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merged_cookies.update(cookies)
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cookies = merged_cookies
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# Gather clues from the surrounding environment.
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if self.trust_env:
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# Set environment's proxies.
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env_proxies = get_environ_proxies(url) or {}
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for (k, v) in env_proxies.items():
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proxies.setdefault(k, v)
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# Set environment's basic authentication.
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if not auth:
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auth = get_netrc_auth(url)
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# Look for configuration.
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if not verify and verify is not False:
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verify = os.environ.get('REQUESTS_CA_BUNDLE')
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# Curl compatibility.
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if not verify and verify is not False:
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verify = os.environ.get('CURL_CA_BUNDLE')
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# Merge all the kwargs.
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params = merge_setting(params, self.params)
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headers = merge_setting(headers, self.headers, dict_class=CaseInsensitiveDict)
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auth = merge_setting(auth, self.auth)
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proxies = merge_setting(proxies, self.proxies)
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hooks = merge_setting(hooks, self.hooks)
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stream = merge_setting(stream, self.stream)
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verify = merge_setting(verify, self.verify)
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cert = merge_setting(cert, self.cert)
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# Create the Request.
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req = Request()
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req.method = method.upper()
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req.url = url
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req.headers = headers
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req.files = files
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req.data = data
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req.params = params
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req.auth = auth
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req.cookies = cookies
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req.hooks = hooks
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# Prepare the Request.
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prep = req.prepare()
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# Send the request.
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send_kwargs = {
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'stream': stream,
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'timeout': timeout,
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'verify': verify,
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'cert': cert,
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'proxies': proxies,
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'allow_redirects': allow_redirects,
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}
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resp = self.send(prep, **send_kwargs)
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return resp
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def get(self, url, **kwargs):
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"""Sends a GET request. Returns :class:`Response` object.
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:param url: URL for the new :class:`Request` object.
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:param \*\*kwargs: Optional arguments that ``request`` takes.
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"""
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kwargs.setdefault('allow_redirects', True)
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return self.request('GET', url, **kwargs)
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def options(self, url, **kwargs):
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"""Sends a OPTIONS request. Returns :class:`Response` object.
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:param url: URL for the new :class:`Request` object.
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:param \*\*kwargs: Optional arguments that ``request`` takes.
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"""
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kwargs.setdefault('allow_redirects', True)
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return self.request('OPTIONS', url, **kwargs)
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def head(self, url, **kwargs):
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"""Sends a HEAD request. Returns :class:`Response` object.
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:param url: URL for the new :class:`Request` object.
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:param \*\*kwargs: Optional arguments that ``request`` takes.
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"""
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kwargs.setdefault('allow_redirects', False)
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return self.request('HEAD', url, **kwargs)
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def post(self, url, data=None, **kwargs):
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"""Sends a POST request. Returns :class:`Response` object.
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:param url: URL for the new :class:`Request` object.
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:param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
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:param \*\*kwargs: Optional arguments that ``request`` takes.
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"""
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return self.request('POST', url, data=data, **kwargs)
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def put(self, url, data=None, **kwargs):
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"""Sends a PUT request. Returns :class:`Response` object.
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:param url: URL for the new :class:`Request` object.
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:param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
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:param \*\*kwargs: Optional arguments that ``request`` takes.
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"""
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return self.request('PUT', url, data=data, **kwargs)
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def patch(self, url, data=None, **kwargs):
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"""Sends a PATCH request. Returns :class:`Response` object.
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:param url: URL for the new :class:`Request` object.
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:param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`.
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:param \*\*kwargs: Optional arguments that ``request`` takes.
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"""
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return self.request('PATCH', url, data=data, **kwargs)
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def delete(self, url, **kwargs):
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"""Sends a DELETE request. Returns :class:`Response` object.
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:param url: URL for the new :class:`Request` object.
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:param \*\*kwargs: Optional arguments that ``request`` takes.
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"""
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return self.request('DELETE', url, **kwargs)
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def send(self, request, **kwargs):
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"""Send a given PreparedRequest."""
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# Set defaults that the hooks can utilize to ensure they always have
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# the correct parameters to reproduce the previous request.
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kwargs.setdefault('stream', self.stream)
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kwargs.setdefault('verify', self.verify)
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kwargs.setdefault('cert', self.cert)
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kwargs.setdefault('proxies', self.proxies)
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# It's possible that users might accidentally send a Request object.
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# Guard against that specific failure case.
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if getattr(request, 'prepare', None):
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raise ValueError('You can only send PreparedRequests.')
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# Set up variables needed for resolve_redirects and dispatching of
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# hooks
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allow_redirects = kwargs.pop('allow_redirects', True)
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stream = kwargs.get('stream')
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timeout = kwargs.get('timeout')
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verify = kwargs.get('verify')
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cert = kwargs.get('cert')
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proxies = kwargs.get('proxies')
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hooks = request.hooks
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# Get the appropriate adapter to use
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adapter = self.get_adapter(url=request.url)
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# Start time (approximately) of the request
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start = datetime.utcnow()
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# Send the request
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r = adapter.send(request, **kwargs)
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# Total elapsed time of the request (approximately)
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r.elapsed = datetime.utcnow() - start
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# Response manipulation hooks
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r = dispatch_hook('response', hooks, r, **kwargs)
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# Persist cookies
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extract_cookies_to_jar(self.cookies, request, r.raw)
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# Redirect resolving generator.
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gen = self.resolve_redirects(r, request, stream=stream,
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timeout=timeout, verify=verify, cert=cert,
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proxies=proxies)
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# Resolve redirects if allowed.
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history = [resp for resp in gen] if allow_redirects else []
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# Shuffle things around if there's history.
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if history:
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# Insert the first (original) request at the start
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history.insert(0, r)
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# Get the last request made
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r = history.pop()
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r.history = tuple(history)
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return r
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def get_adapter(self, url):
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"""Returns the appropriate connnection adapter for the given URL."""
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for (prefix, adapter) in self.adapters.items():
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if url.startswith(prefix):
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return adapter
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# Nothing matches :-/
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raise InvalidSchema("No connection adapters were found for '%s'" % url)
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def close(self):
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"""Closes all adapters and as such the session"""
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for _, v in self.adapters.items():
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v.close()
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def mount(self, prefix, adapter):
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"""Registers a connection adapter to a prefix.
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Adapters are sorted in descending order by key length."""
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self.adapters[prefix] = adapter
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keys_to_move = [k for k in self.adapters if len(k) < len(prefix)]
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for key in keys_to_move:
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self.adapters[key] = self.adapters.pop(key)
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def __getstate__(self):
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return dict((attr, getattr(self, attr, None)) for attr in self.__attrs__)
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def __setstate__(self, state):
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for attr, value in state.items():
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setattr(self, attr, value)
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def session():
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"""Returns a :class:`Session` for context-management."""
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return Session()
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