mirror of
https://github.com/janeczku/calibre-web
synced 2024-11-24 18:47:23 +00:00
554 lines
19 KiB
Python
554 lines
19 KiB
Python
# -*- 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 .compat import cookielib, OrderedDict, urljoin, urlparse, builtin_str
|
|
from .cookies import (
|
|
cookiejar_from_dict, extract_cookies_to_jar, RequestsCookieJar, merge_cookies)
|
|
from .models import Request, PreparedRequest
|
|
from .hooks import default_hooks, dispatch_hook
|
|
from .utils import to_key_val_list, default_headers
|
|
from .exceptions import TooManyRedirects, InvalidSchema
|
|
from .structures import CaseInsensitiveDict
|
|
|
|
from .adapters import HTTPAdapter
|
|
|
|
from .utils import requote_uri, get_environ_proxies, get_netrc_auth
|
|
|
|
from .status_codes import codes
|
|
REDIRECT_STATI = (
|
|
codes.moved, # 301
|
|
codes.found, # 302
|
|
codes.other, # 303
|
|
codes.temporary_moved, # 307
|
|
)
|
|
DEFAULT_REDIRECT_LIMIT = 30
|
|
|
|
|
|
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]
|
|
|
|
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 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
|
|
|
|
# ((resp.status_code is codes.see_other))
|
|
while ('location' in resp.headers and resp.status_code in REDIRECT_STATI):
|
|
prepared_request = req.copy()
|
|
|
|
resp.content # Consume socket so it can be released
|
|
|
|
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 non-RFC2616-compliant 'location' headers
|
|
# (e.g. '/path/to/resource' instead of 'http://domain.tld/path/to/resource')
|
|
# Compliant with RFC3986, we percent encode the url.
|
|
if not urlparse(url).netloc:
|
|
url = urljoin(resp.url, requote_uri(url))
|
|
else:
|
|
url = requote_uri(url)
|
|
|
|
prepared_request.url = url
|
|
|
|
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10.3.4
|
|
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, codes.resume):
|
|
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_cookies_to_jar(prepared_request._cookies,
|
|
prepared_request, resp.raw)
|
|
prepared_request._cookies.update(self.cookies)
|
|
prepared_request.prepare_cookies(prepared_request._cookies)
|
|
|
|
resp = self.send(
|
|
prepared_request,
|
|
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
|
|
|
|
|
|
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', 'timeout', '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())
|
|
|
|
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,
|
|
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):
|
|
"""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 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) Float describing the timeout of the
|
|
request.
|
|
:param allow_redirects: (optional) Boolean. Set to True by default.
|
|
: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 = builtin_str(method)
|
|
|
|
# Create the Request.
|
|
req = Request(
|
|
method = method.upper(),
|
|
url = url,
|
|
headers = headers,
|
|
files = files,
|
|
data = data or {},
|
|
params = params or {},
|
|
auth = auth,
|
|
cookies = cookies,
|
|
hooks = hooks,
|
|
)
|
|
prep = self.prepare_request(req)
|
|
|
|
proxies = proxies or {}
|
|
|
|
# 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 configuration.
|
|
if not verify and verify is not False:
|
|
verify = os.environ.get('REQUESTS_CA_BUNDLE')
|
|
|
|
# Curl compatibility.
|
|
if not verify and verify is not False:
|
|
verify = 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)
|
|
|
|
# Send the request.
|
|
send_kwargs = {
|
|
'stream': stream,
|
|
'timeout': timeout,
|
|
'verify': verify,
|
|
'cert': cert,
|
|
'proxies': proxies,
|
|
'allow_redirects': allow_redirects,
|
|
}
|
|
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, **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 \*\*kwargs: Optional arguments that ``request`` takes.
|
|
"""
|
|
|
|
return self.request('POST', url, data=data, **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.')
|
|
|
|
# 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 = tuple(history)
|
|
|
|
return r
|
|
|
|
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):
|
|
return dict((attr, getattr(self, attr, None)) for attr in self.__attrs__)
|
|
|
|
def __setstate__(self, state):
|
|
for attr, value in state.items():
|
|
setattr(self, attr, value)
|
|
|
|
|
|
def session():
|
|
"""Returns a :class:`Session` for context-management."""
|
|
|
|
return Session()
|