Edit File: sessions.py
# -*- coding: utf-8 -*- """ requests.session ~~~~~~~~~~~~~~~~ This module provides a Session object to manage and persist settings across requests (cookies, auth, proxies). """ import os from collections import Mapping from datetime import datetime from .auth import _basic_auth_str from .compat import cookielib, OrderedDict, urljoin, urlparse from .cookies import ( cookiejar_from_dict, extract_cookies_to_jar, RequestsCookieJar, merge_cookies) from .models import Request, PreparedRequest, DEFAULT_REDIRECT_LIMIT from .hooks import default_hooks, dispatch_hook from .utils import to_key_val_list, default_headers, to_native_string, DEFAULT_PORTS from .exceptions import ( TooManyRedirects, InvalidSchema, ChunkedEncodingError, ContentDecodingError) from urllib3._collections import RecentlyUsedContainer from .structures import CaseInsensitiveDict from .adapters import HTTPAdapter from .utils import ( requote_uri, get_environ_proxies, get_netrc_auth, should_bypass_proxies, get_auth_from_url ) from .status_codes import codes # formerly defined here, reexposed here for backward compatibility from .models import REDIRECT_STATI REDIRECT_CACHE_SIZE = 1000 def merge_setting(request_setting, session_setting, dict_class=OrderedDict): """ Determines appropriate setting for a given request, taking into account the explicit setting on that request, and the setting in the session. If a setting is a dictionary, they will be merged together using `dict_class` """ if session_setting is None: return request_setting if request_setting is None: return session_setting # Bypass if not a dictionary (e.g. verify) if not ( isinstance(session_setting, Mapping) and isinstance(request_setting, Mapping) ): return request_setting merged_setting = dict_class(to_key_val_list(session_setting)) merged_setting.update(to_key_val_list(request_setting)) # Remove keys that are set to None. for (k, v) in request_setting.items(): if v is None: del merged_setting[k] merged_setting = dict((k, v) for (k, v) in merged_setting.items() if v is not None) return merged_setting def merge_hooks(request_hooks, session_hooks, dict_class=OrderedDict): """ Properly merges both requests and session hooks. This is necessary because when request_hooks == {'response': []}, the merge breaks Session hooks entirely. """ if session_hooks is None or session_hooks.get('response') == []: return request_hooks if request_hooks is None or request_hooks.get('response') == []: return session_hooks return merge_setting(request_hooks, session_hooks, dict_class) class SessionRedirectMixin(object): def should_strip_auth(self, old_url, new_url): """Decide whether Authorization header should be removed when redirecting""" old_parsed = urlparse(old_url) new_parsed = urlparse(new_url) if old_parsed.hostname != new_parsed.hostname: return True # Special case: allow http -> https redirect when using the standard # ports. This isn't specified by RFC 7235, but is kept to avoid # breaking backwards compatibility with older versions of requests # that allowed any redirects on the same host. if (old_parsed.scheme == 'http' and old_parsed.port in (80, None) and new_parsed.scheme == 'https' and new_parsed.port in (443, None)): return False # Handle default port usage corresponding to scheme. changed_port = old_parsed.port != new_parsed.port changed_scheme = old_parsed.scheme != new_parsed.scheme default_port = (DEFAULT_PORTS.get(old_parsed.scheme, None), None) if (not changed_scheme and old_parsed.port in default_port and new_parsed.port in default_port): return False # Standard case: root URI must match return changed_port or changed_scheme def resolve_redirects(self, resp, req, stream=False, timeout=None, verify=True, cert=None, proxies=None): """Receives a Response. Returns a generator of Responses.""" i = 0 hist = [] # keep track of history while resp.is_redirect: prepared_request = req.copy() if i > 0: # Update history and keep track of redirects. hist.append(resp) new_hist = list(hist) resp.history = new_hist try: resp.content # Consume socket so it can be released except (ChunkedEncodingError, ContentDecodingError, RuntimeError): resp.raw.read(decode_content=False) if i >= self.max_redirects: raise TooManyRedirects('Exceeded %s redirects.' % self.max_redirects) # Release the connection back into the pool. resp.close() url = resp.headers['location'] method = req.method # Handle redirection without scheme (see: RFC 1808 Section 4) if url.startswith('//'): parsed_rurl = urlparse(resp.url) url = '%s:%s' % (parsed_rurl.scheme, url) # The scheme should be lower case... parsed = urlparse(url) url = parsed.geturl() # Facilitate relative 'location' headers, as allowed by RFC 7231. # (e.g. '/path/to/resource' instead of 'http://domain.tld/path/to/resource') # Compliant with RFC3986, we percent encode the url. if not parsed.netloc: url = urljoin(resp.url, requote_uri(url)) else: url = requote_uri(url) prepared_request.url = to_native_string(url) # Cache the url, unless it redirects to itself. if resp.is_permanent_redirect and req.url != prepared_request.url: self.redirect_cache[req.url] = prepared_request.url # http://tools.ietf.org/html/rfc7231#section-6.4.4 if (resp.status_code == codes.see_other and method != 'HEAD'): method = 'GET' # Do what the browsers do, despite standards... # First, turn 302s into GETs. if resp.status_code == codes.found and method != 'HEAD': method = 'GET' # Second, if a POST is responded to with a 301, turn it into a GET. # This bizarre behaviour is explained in Issue 1704. if resp.status_code == codes.moved and method == 'POST': method = 'GET' prepared_request.method = method # https://github.com/kennethreitz/requests/issues/1084 if resp.status_code not in (codes.temporary_redirect, codes.permanent_redirect): if 'Content-Length' in prepared_request.headers: del prepared_request.headers['Content-Length'] prepared_request.body = None headers = prepared_request.headers try: del headers['Cookie'] except KeyError: pass # Extract any cookies sent on the response to the cookiejar # in the new request. Because we've mutated our copied prepared # request, use the old one that we haven't yet touched. extract_cookies_to_jar(prepared_request._cookies, req, resp.raw) prepared_request._cookies.update(self.cookies) prepared_request.prepare_cookies(prepared_request._cookies) # Rebuild auth and proxy information. proxies = self.rebuild_proxies(prepared_request, proxies) self.rebuild_auth(prepared_request, resp) # Override the original request. req = prepared_request resp = self.send( req, stream=stream, timeout=timeout, verify=verify, cert=cert, proxies=proxies, allow_redirects=False, ) extract_cookies_to_jar(self.cookies, prepared_request, resp.raw) i += 1 yield resp def rebuild_auth(self, prepared_request, response): """ When being redirected we may want to strip authentication from the request to avoid leaking credentials. This method intelligently removes and reapplies authentication where possible to avoid credential loss. """ headers = prepared_request.headers url = prepared_request.url if 'Authorization' in headers and self.should_strip_auth(response.request.url, url): # If we get redirected to a new host, we should strip out any # authentication headers. del headers['Authorization'] # .netrc might have more auth for us on our new host. new_auth = get_netrc_auth(url) if self.trust_env else None if new_auth is not None: prepared_request.prepare_auth(new_auth) return def rebuild_proxies(self, prepared_request, proxies): """ This method re-evaluates the proxy configuration by considering the environment variables. If we are redirected to a URL covered by NO_PROXY, we strip the proxy configuration. Otherwise, we set missing proxy keys for this URL (in case they were stripped by a previous redirect). This method also replaces the Proxy-Authorization header where necessary. """ headers = prepared_request.headers url = prepared_request.url scheme = urlparse(url).scheme new_proxies = proxies.copy() if proxies is not None else {} if self.trust_env and not should_bypass_proxies(url): environ_proxies = get_environ_proxies(url) proxy = environ_proxies.get(scheme) if proxy: new_proxies.setdefault(scheme, environ_proxies[scheme]) if 'Proxy-Authorization' in headers: del headers['Proxy-Authorization'] try: username, password = get_auth_from_url(new_proxies[scheme]) except KeyError: username, password = None, None if username and password: headers['Proxy-Authorization'] = _basic_auth_str(username, password) return new_proxies class Session(SessionRedirectMixin): """A Requests session. Provides cookie persistence, connection-pooling, and configuration. Basic Usage:: >>> import requests >>> s = requests.Session() >>> s.get('http://httpbin.org/get') 200 """ __attrs__ = [ 'headers', 'cookies', 'auth', 'proxies', 'hooks', 'params', 'verify', 'cert', 'prefetch', 'adapters', 'stream', 'trust_env', 'max_redirects', ] def __init__(self): #: A case-insensitive dictionary of headers to be sent on each #: :class:`Request <Request>` sent from this #: :class:`Session <Session>`. self.headers = default_headers() #: Default Authentication tuple or object to attach to #: :class:`Request <Request>`. self.auth = None #: Dictionary mapping protocol to the URL of the proxy (e.g. #: {'http': 'foo.bar:3128'}) to be used on each #: :class:`Request <Request>`. self.proxies = {} #: Event-handling hooks. self.hooks = default_hooks() #: Dictionary of querystring data to attach to each #: :class:`Request <Request>`. The dictionary values may be lists for #: representing multivalued query parameters. self.params = {} #: Stream response content default. self.stream = False #: SSL Verification default. self.verify = True #: SSL certificate default. self.cert = None #: Maximum number of redirects allowed. If the request exceeds this #: limit, a :class:`TooManyRedirects` exception is raised. self.max_redirects = DEFAULT_REDIRECT_LIMIT #: Should we trust the environment? self.trust_env = True #: A CookieJar containing all currently outstanding cookies set on this #: session. By default it is a #: :class:`RequestsCookieJar <requests.cookies.RequestsCookieJar>`, but #: may be any other ``cookielib.CookieJar`` compatible object. self.cookies = cookiejar_from_dict({}) # Default connection adapters. self.adapters = OrderedDict() self.mount('https://', HTTPAdapter()) self.mount('http://', HTTPAdapter()) # Only store 1000 redirects to prevent using infinite memory self.redirect_cache = RecentlyUsedContainer(REDIRECT_CACHE_SIZE) def __enter__(self): return self def __exit__(self, *args): self.close() def prepare_request(self, request): """Constructs a :class:`PreparedRequest <PreparedRequest>` for transmission and returns it. The :class:`PreparedRequest` has settings merged from the :class:`Request <Request>` instance and those of the :class:`Session`. :param request: :class:`Request` instance to prepare with this session's settings. """ cookies = request.cookies or {} # Bootstrap CookieJar. if not isinstance(cookies, cookielib.CookieJar): cookies = cookiejar_from_dict(cookies) # Merge with session cookies merged_cookies = merge_cookies( merge_cookies(RequestsCookieJar(), self.cookies), cookies) # Set environment's basic authentication if not explicitly set. auth = request.auth if self.trust_env and not auth and not self.auth: auth = get_netrc_auth(request.url) p = PreparedRequest() p.prepare( method=request.method.upper(), url=request.url, files=request.files, data=request.data, json=request.json, headers=merge_setting(request.headers, self.headers, dict_class=CaseInsensitiveDict), params=merge_setting(request.params, self.params), auth=merge_setting(auth, self.auth), cookies=merged_cookies, hooks=merge_hooks(request.hooks, self.hooks), ) return p def request(self, method, url, params=None, data=None, headers=None, cookies=None, files=None, auth=None, timeout=None, allow_redirects=True, proxies=None, hooks=None, stream=None, verify=None, cert=None, json=None): """Constructs a :class:`Request <Request>`, prepares it and sends it. Returns :class:`Response <Response>` object. :param method: method for the new :class:`Request` object. :param url: URL for the new :class:`Request` object. :param params: (optional) Dictionary or bytes to be sent in the query string for the :class:`Request`. :param data: (optional) Dictionary or bytes to send in the body of the :class:`Request`. :param json: (optional) json to send in the body of the :class:`Request`. :param headers: (optional) Dictionary of HTTP Headers to send with the :class:`Request`. :param cookies: (optional) Dict or CookieJar object to send with the :class:`Request`. :param files: (optional) Dictionary of ``'filename': file-like-objects`` for multipart encoding upload. :param auth: (optional) Auth tuple or callable to enable Basic/Digest/Custom HTTP Auth. :param timeout: (optional) How long to wait for the server to send data before giving up, as a float, or a (`connect timeout, read timeout <user/advanced.html#timeouts>`_) tuple. :type timeout: float or tuple :param allow_redirects: (optional) Set to True by default. :type allow_redirects: bool :param proxies: (optional) Dictionary mapping protocol to the URL of the proxy. :param stream: (optional) whether to immediately download the response content. Defaults to ``False``. :param verify: (optional) if ``True``, the SSL cert will be verified. A CA_BUNDLE path can also be provided. :param cert: (optional) if String, path to ssl client cert file (.pem). If Tuple, ('cert', 'key') pair. """ method = to_native_string(method) # Create the Request. req = Request( method = method.upper(), url = url, headers = headers, files = files, data = data or {}, json = json, params = params or {}, auth = auth, cookies = cookies, hooks = hooks, ) prep = self.prepare_request(req) proxies = proxies or {} settings = self.merge_environment_settings( prep.url, proxies, stream, verify, cert ) # Send the request. send_kwargs = { 'timeout': timeout, 'allow_redirects': allow_redirects, } send_kwargs.update(settings) resp = self.send(prep, **send_kwargs) return resp def get(self, url, **kwargs): """Sends a GET request. Returns :class:`Response` object. :param url: URL for the new :class:`Request` object. :param \*\*kwargs: Optional arguments that ``request`` takes. """ kwargs.setdefault('allow_redirects', True) return self.request('GET', url, **kwargs) def options(self, url, **kwargs): """Sends a OPTIONS request. Returns :class:`Response` object. :param url: URL for the new :class:`Request` object. :param \*\*kwargs: Optional arguments that ``request`` takes. """ kwargs.setdefault('allow_redirects', True) return self.request('OPTIONS', url, **kwargs) def head(self, url, **kwargs): """Sends a HEAD request. Returns :class:`Response` object. :param url: URL for the new :class:`Request` object. :param \*\*kwargs: Optional arguments that ``request`` takes. """ kwargs.setdefault('allow_redirects', False) return self.request('HEAD', url, **kwargs) def post(self, url, data=None, json=None, **kwargs): """Sends a POST request. Returns :class:`Response` object. :param url: URL for the new :class:`Request` object. :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`. :param json: (optional) json to send in the body of the :class:`Request`. :param \*\*kwargs: Optional arguments that ``request`` takes. """ return self.request('POST', url, data=data, json=json, **kwargs) def put(self, url, data=None, **kwargs): """Sends a PUT request. Returns :class:`Response` object. :param url: URL for the new :class:`Request` object. :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`. :param \*\*kwargs: Optional arguments that ``request`` takes. """ return self.request('PUT', url, data=data, **kwargs) def patch(self, url, data=None, **kwargs): """Sends a PATCH request. Returns :class:`Response` object. :param url: URL for the new :class:`Request` object. :param data: (optional) Dictionary, bytes, or file-like object to send in the body of the :class:`Request`. :param \*\*kwargs: Optional arguments that ``request`` takes. """ return self.request('PATCH', url, data=data, **kwargs) def delete(self, url, **kwargs): """Sends a DELETE request. Returns :class:`Response` object. :param url: URL for the new :class:`Request` object. :param \*\*kwargs: Optional arguments that ``request`` takes. """ return self.request('DELETE', url, **kwargs) def send(self, request, **kwargs): """Send a given PreparedRequest.""" # Set defaults that the hooks can utilize to ensure they always have # the correct parameters to reproduce the previous request. kwargs.setdefault('stream', self.stream) kwargs.setdefault('verify', self.verify) kwargs.setdefault('cert', self.cert) kwargs.setdefault('proxies', self.proxies) # It's possible that users might accidentally send a Request object. # Guard against that specific failure case. if not isinstance(request, PreparedRequest): raise ValueError('You can only send PreparedRequests.') checked_urls = set() while request.url in self.redirect_cache: checked_urls.add(request.url) new_url = self.redirect_cache.get(request.url) if new_url in checked_urls: break request.url = new_url # Set up variables needed for resolve_redirects and dispatching of hooks allow_redirects = kwargs.pop('allow_redirects', True) stream = kwargs.get('stream') timeout = kwargs.get('timeout') verify = kwargs.get('verify') cert = kwargs.get('cert') proxies = kwargs.get('proxies') hooks = request.hooks # Get the appropriate adapter to use adapter = self.get_adapter(url=request.url) # Start time (approximately) of the request start = datetime.utcnow() # Send the request r = adapter.send(request, **kwargs) # Total elapsed time of the request (approximately) r.elapsed = datetime.utcnow() - start # Response manipulation hooks r = dispatch_hook('response', hooks, r, **kwargs) # Persist cookies if r.history: # If the hooks create history then we want those cookies too for resp in r.history: extract_cookies_to_jar(self.cookies, resp.request, resp.raw) extract_cookies_to_jar(self.cookies, request, r.raw) # Redirect resolving generator. gen = self.resolve_redirects(r, request, stream=stream, timeout=timeout, verify=verify, cert=cert, proxies=proxies) # Resolve redirects if allowed. history = [resp for resp in gen] if allow_redirects else [] # Shuffle things around if there's history. if history: # Insert the first (original) request at the start history.insert(0, r) # Get the last request made r = history.pop() r.history = history if not stream: r.content return r def merge_environment_settings(self, url, proxies, stream, verify, cert): """Check the environment and merge it with some settings.""" # Gather clues from the surrounding environment. if self.trust_env: # Set environment's proxies. env_proxies = get_environ_proxies(url) or {} for (k, v) in env_proxies.items(): proxies.setdefault(k, v) # Look for requests environment configuration and be compatible # with cURL. if verify is True or verify is None: verify = (os.environ.get('REQUESTS_CA_BUNDLE') or os.environ.get('CURL_CA_BUNDLE')) # Merge all the kwargs. proxies = merge_setting(proxies, self.proxies) stream = merge_setting(stream, self.stream) verify = merge_setting(verify, self.verify) cert = merge_setting(cert, self.cert) return {'verify': verify, 'proxies': proxies, 'stream': stream, 'cert': cert} def get_adapter(self, url): """Returns the appropriate connnection adapter for the given URL.""" for (prefix, adapter) in self.adapters.items(): if url.lower().startswith(prefix): return adapter # Nothing matches :-/ raise InvalidSchema("No connection adapters were found for '%s'" % url) def close(self): """Closes all adapters and as such the session""" for v in self.adapters.values(): v.close() def mount(self, prefix, adapter): """Registers a connection adapter to a prefix. Adapters are sorted in descending order by key length.""" self.adapters[prefix] = adapter keys_to_move = [k for k in self.adapters if len(k) < len(prefix)] for key in keys_to_move: self.adapters[key] = self.adapters.pop(key) def __getstate__(self): state = dict((attr, getattr(self, attr, None)) for attr in self.__attrs__) state['redirect_cache'] = dict(self.redirect_cache) return state def __setstate__(self, state): redirect_cache = state.pop('redirect_cache', {}) for attr, value in state.items(): setattr(self, attr, value) self.redirect_cache = RecentlyUsedContainer(REDIRECT_CACHE_SIZE) for redirect, to in redirect_cache.items(): self.redirect_cache[redirect] = to def session(): """Returns a :class:`Session` for context-management.""" return Session()