mirror of
https://github.com/janeczku/calibre-web
synced 2024-11-28 12:30:00 +00:00
782 lines
25 KiB
Python
782 lines
25 KiB
Python
# -*- coding: utf-8 -*-
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"""
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requests.models
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~~~~~~~~~~~~~~~
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This module contains the primary objects that power Requests.
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"""
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import collections
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import logging
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import datetime
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from io import BytesIO, UnsupportedOperation
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from .hooks import default_hooks
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from .structures import CaseInsensitiveDict
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from .auth import HTTPBasicAuth
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from .cookies import cookiejar_from_dict, get_cookie_header
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from .packages.urllib3.fields import RequestField
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from .packages.urllib3.filepost import encode_multipart_formdata
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from .packages.urllib3.util import parse_url
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from .packages.urllib3.exceptions import DecodeError
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from .exceptions import (
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HTTPError, RequestException, MissingSchema, InvalidURL,
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ChunkedEncodingError, ContentDecodingError)
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from .utils import (
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guess_filename, get_auth_from_url, requote_uri,
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stream_decode_response_unicode, to_key_val_list, parse_header_links,
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iter_slices, guess_json_utf, super_len, to_native_string)
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from .compat import (
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cookielib, urlunparse, urlsplit, urlencode, str, bytes, StringIO,
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is_py2, chardet, json, builtin_str, basestring, IncompleteRead)
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CONTENT_CHUNK_SIZE = 10 * 1024
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ITER_CHUNK_SIZE = 512
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log = logging.getLogger(__name__)
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class RequestEncodingMixin(object):
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@property
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def path_url(self):
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"""Build the path URL to use."""
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url = []
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p = urlsplit(self.url)
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path = p.path
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if not path:
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path = '/'
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url.append(path)
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query = p.query
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if query:
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url.append('?')
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url.append(query)
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return ''.join(url)
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@staticmethod
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def _encode_params(data):
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"""Encode parameters in a piece of data.
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Will successfully encode parameters when passed as a dict or a list of
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2-tuples. Order is retained if data is a list of 2-tuples but arbitrary
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if parameters are supplied as a dict.
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"""
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if isinstance(data, (str, bytes)):
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return data
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elif hasattr(data, 'read'):
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return data
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elif hasattr(data, '__iter__'):
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result = []
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for k, vs in to_key_val_list(data):
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if isinstance(vs, basestring) or not hasattr(vs, '__iter__'):
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vs = [vs]
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for v in vs:
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if v is not None:
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result.append(
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(k.encode('utf-8') if isinstance(k, str) else k,
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v.encode('utf-8') if isinstance(v, str) else v))
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return urlencode(result, doseq=True)
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else:
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return data
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@staticmethod
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def _encode_files(files, data):
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"""Build the body for a multipart/form-data request.
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Will successfully encode files when passed as a dict or a list of
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2-tuples. Order is retained if data is a list of 2-tuples but arbitrary
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if parameters are supplied as a dict.
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"""
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if (not files):
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raise ValueError("Files must be provided.")
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elif isinstance(data, basestring):
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raise ValueError("Data must not be a string.")
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new_fields = []
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fields = to_key_val_list(data or {})
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files = to_key_val_list(files or {})
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for field, val in fields:
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if isinstance(val, basestring) or not hasattr(val, '__iter__'):
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val = [val]
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for v in val:
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if v is not None:
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# Don't call str() on bytestrings: in Py3 it all goes wrong.
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if not isinstance(v, bytes):
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v = str(v)
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new_fields.append(
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(field.decode('utf-8') if isinstance(field, bytes) else field,
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v.encode('utf-8') if isinstance(v, str) else v))
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for (k, v) in files:
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# support for explicit filename
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ft = None
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fh = None
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if isinstance(v, (tuple, list)):
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if len(v) == 2:
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fn, fp = v
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elif len(v) == 3:
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fn, fp, ft = v
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else:
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fn, fp, ft, fh = v
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else:
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fn = guess_filename(v) or k
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fp = v
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if isinstance(fp, str):
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fp = StringIO(fp)
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if isinstance(fp, bytes):
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fp = BytesIO(fp)
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rf = RequestField(name=k, data=fp.read(),
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filename=fn, headers=fh)
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rf.make_multipart(content_type=ft)
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new_fields.append(rf)
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body, content_type = encode_multipart_formdata(new_fields)
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return body, content_type
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class RequestHooksMixin(object):
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def register_hook(self, event, hook):
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"""Properly register a hook."""
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if event not in self.hooks:
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raise ValueError('Unsupported event specified, with event name "%s"' % (event))
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if isinstance(hook, collections.Callable):
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self.hooks[event].append(hook)
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elif hasattr(hook, '__iter__'):
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self.hooks[event].extend(h for h in hook if isinstance(h, collections.Callable))
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def deregister_hook(self, event, hook):
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"""Deregister a previously registered hook.
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Returns True if the hook existed, False if not.
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"""
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try:
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self.hooks[event].remove(hook)
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return True
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except ValueError:
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return False
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class Request(RequestHooksMixin):
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"""A user-created :class:`Request <Request>` object.
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Used to prepare a :class:`PreparedRequest <PreparedRequest>`, which is sent to the server.
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:param method: HTTP method to use.
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:param url: URL to send.
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:param headers: dictionary of headers to send.
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:param files: dictionary of {filename: fileobject} files to multipart upload.
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:param data: the body to attach the request. If a dictionary is provided, form-encoding will take place.
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:param params: dictionary of URL parameters to append to the URL.
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:param auth: Auth handler or (user, pass) tuple.
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:param cookies: dictionary or CookieJar of cookies to attach to this request.
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:param hooks: dictionary of callback hooks, for internal usage.
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Usage::
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>>> import requests
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>>> req = requests.Request('GET', 'http://httpbin.org/get')
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>>> req.prepare()
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<PreparedRequest [GET]>
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"""
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def __init__(self,
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method=None,
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url=None,
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headers=None,
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files=None,
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data=None,
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params=None,
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auth=None,
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cookies=None,
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hooks=None):
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# Default empty dicts for dict params.
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data = [] if data is None else data
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files = [] if files is None else files
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headers = {} if headers is None else headers
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params = {} if params is None else params
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hooks = {} if hooks is None else hooks
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self.hooks = default_hooks()
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for (k, v) in list(hooks.items()):
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self.register_hook(event=k, hook=v)
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self.method = method
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self.url = url
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self.headers = headers
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self.files = files
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self.data = data
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self.params = params
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self.auth = auth
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self.cookies = cookies
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def __repr__(self):
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return '<Request [%s]>' % (self.method)
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def prepare(self):
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"""Constructs a :class:`PreparedRequest <PreparedRequest>` for transmission and returns it."""
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p = PreparedRequest()
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p.prepare(
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method=self.method,
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url=self.url,
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headers=self.headers,
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files=self.files,
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data=self.data,
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params=self.params,
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auth=self.auth,
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cookies=self.cookies,
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hooks=self.hooks,
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)
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return p
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class PreparedRequest(RequestEncodingMixin, RequestHooksMixin):
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"""The fully mutable :class:`PreparedRequest <PreparedRequest>` object,
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containing the exact bytes that will be sent to the server.
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Generated from either a :class:`Request <Request>` object or manually.
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Usage::
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>>> import requests
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>>> req = requests.Request('GET', 'http://httpbin.org/get')
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>>> r = req.prepare()
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<PreparedRequest [GET]>
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>>> s = requests.Session()
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>>> s.send(r)
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<Response [200]>
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"""
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def __init__(self):
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#: HTTP verb to send to the server.
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self.method = None
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#: HTTP URL to send the request to.
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self.url = None
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#: dictionary of HTTP headers.
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self.headers = None
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# The `CookieJar` used to create the Cookie header will be stored here
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# after prepare_cookies is called
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self._cookies = None
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#: request body to send to the server.
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self.body = None
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#: dictionary of callback hooks, for internal usage.
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self.hooks = default_hooks()
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def prepare(self, method=None, url=None, headers=None, files=None,
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data=None, params=None, auth=None, cookies=None, hooks=None):
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"""Prepares the entire request with the given parameters."""
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self.prepare_method(method)
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self.prepare_url(url, params)
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self.prepare_headers(headers)
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self.prepare_cookies(cookies)
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self.prepare_body(data, files)
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self.prepare_auth(auth, url)
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# Note that prepare_auth must be last to enable authentication schemes
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# such as OAuth to work on a fully prepared request.
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# This MUST go after prepare_auth. Authenticators could add a hook
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self.prepare_hooks(hooks)
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def __repr__(self):
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return '<PreparedRequest [%s]>' % (self.method)
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def copy(self):
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p = PreparedRequest()
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p.method = self.method
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p.url = self.url
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p.headers = self.headers.copy()
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p._cookies = self._cookies.copy()
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p.body = self.body
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p.hooks = self.hooks
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return p
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def prepare_method(self, method):
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"""Prepares the given HTTP method."""
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self.method = method
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if self.method is not None:
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self.method = self.method.upper()
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def prepare_url(self, url, params):
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"""Prepares the given HTTP URL."""
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#: Accept objects that have string representations.
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try:
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url = unicode(url)
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except NameError:
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# We're on Python 3.
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url = str(url)
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except UnicodeDecodeError:
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pass
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# Don't do any URL preparation for oddball schemes
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if ':' in url and not url.lower().startswith('http'):
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self.url = url
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return
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# Support for unicode domain names and paths.
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scheme, auth, host, port, path, query, fragment = parse_url(url)
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if not scheme:
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raise MissingSchema("Invalid URL {0!r}: No schema supplied. "
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"Perhaps you meant http://{0}?".format(url))
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if not host:
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raise InvalidURL("Invalid URL %r: No host supplied" % url)
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# Only want to apply IDNA to the hostname
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try:
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host = host.encode('idna').decode('utf-8')
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except UnicodeError:
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raise InvalidURL('URL has an invalid label.')
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# Carefully reconstruct the network location
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netloc = auth or ''
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if netloc:
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netloc += '@'
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netloc += host
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if port:
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netloc += ':' + str(port)
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# Bare domains aren't valid URLs.
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if not path:
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path = '/'
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if is_py2:
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if isinstance(scheme, str):
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scheme = scheme.encode('utf-8')
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if isinstance(netloc, str):
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netloc = netloc.encode('utf-8')
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if isinstance(path, str):
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path = path.encode('utf-8')
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if isinstance(query, str):
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query = query.encode('utf-8')
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if isinstance(fragment, str):
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fragment = fragment.encode('utf-8')
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enc_params = self._encode_params(params)
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if enc_params:
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if query:
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query = '%s&%s' % (query, enc_params)
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else:
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query = enc_params
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url = requote_uri(urlunparse([scheme, netloc, path, None, query, fragment]))
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self.url = url
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def prepare_headers(self, headers):
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"""Prepares the given HTTP headers."""
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if headers:
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self.headers = CaseInsensitiveDict((to_native_string(name), value) for name, value in headers.items())
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else:
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self.headers = CaseInsensitiveDict()
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def prepare_body(self, data, files):
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"""Prepares the given HTTP body data."""
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# Check if file, fo, generator, iterator.
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# If not, run through normal process.
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# Nottin' on you.
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body = None
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content_type = None
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length = None
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is_stream = all([
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hasattr(data, '__iter__'),
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not isinstance(data, basestring),
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not isinstance(data, list),
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not isinstance(data, dict)
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])
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try:
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length = super_len(data)
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except (TypeError, AttributeError, UnsupportedOperation):
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length = None
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if is_stream:
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body = data
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if files:
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raise NotImplementedError('Streamed bodies and files are mutually exclusive.')
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if length is not None:
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self.headers['Content-Length'] = builtin_str(length)
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else:
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self.headers['Transfer-Encoding'] = 'chunked'
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else:
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# Multi-part file uploads.
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if files:
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(body, content_type) = self._encode_files(files, data)
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else:
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if data:
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body = self._encode_params(data)
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if isinstance(data, str) or isinstance(data, builtin_str) or hasattr(data, 'read'):
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content_type = None
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else:
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content_type = 'application/x-www-form-urlencoded'
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self.prepare_content_length(body)
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# Add content-type if it wasn't explicitly provided.
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if (content_type) and (not 'content-type' in self.headers):
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self.headers['Content-Type'] = content_type
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self.body = body
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def prepare_content_length(self, body):
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if hasattr(body, 'seek') and hasattr(body, 'tell'):
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body.seek(0, 2)
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self.headers['Content-Length'] = builtin_str(body.tell())
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body.seek(0, 0)
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elif body is not None:
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l = super_len(body)
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if l:
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self.headers['Content-Length'] = builtin_str(l)
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elif self.method not in ('GET', 'HEAD'):
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self.headers['Content-Length'] = '0'
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def prepare_auth(self, auth, url=''):
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"""Prepares the given HTTP auth data."""
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# If no Auth is explicitly provided, extract it from the URL first.
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if auth is None:
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url_auth = get_auth_from_url(self.url)
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auth = url_auth if any(url_auth) else None
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if auth:
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if isinstance(auth, tuple) and len(auth) == 2:
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# special-case basic HTTP auth
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auth = HTTPBasicAuth(*auth)
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# Allow auth to make its changes.
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r = auth(self)
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# Update self to reflect the auth changes.
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self.__dict__.update(r.__dict__)
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# Recompute Content-Length
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self.prepare_content_length(self.body)
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def prepare_cookies(self, cookies):
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"""Prepares the given HTTP cookie data."""
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if isinstance(cookies, cookielib.CookieJar):
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self._cookies = cookies
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else:
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self._cookies = cookiejar_from_dict(cookies)
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cookie_header = get_cookie_header(self._cookies, self)
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if cookie_header is not None:
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self.headers['Cookie'] = cookie_header
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def prepare_hooks(self, hooks):
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"""Prepares the given hooks."""
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for event in hooks:
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self.register_hook(event, hooks[event])
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class Response(object):
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"""The :class:`Response <Response>` object, which contains a
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server's response to an HTTP request.
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"""
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__attrs__ = [
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'_content',
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'status_code',
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'headers',
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'url',
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'history',
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'encoding',
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'reason',
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'cookies',
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'elapsed',
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'request',
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]
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def __init__(self):
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super(Response, self).__init__()
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self._content = False
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self._content_consumed = False
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#: Integer Code of responded HTTP Status.
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self.status_code = None
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#: Case-insensitive Dictionary of Response Headers.
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#: For example, ``headers['content-encoding']`` will return the
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#: value of a ``'Content-Encoding'`` response header.
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self.headers = CaseInsensitiveDict()
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#: File-like object representation of response (for advanced usage).
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#: Requires that ``stream=True` on the request.
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# This requirement does not apply for use internally to Requests.
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self.raw = None
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#: Final URL location of Response.
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self.url = None
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#: Encoding to decode with when accessing r.text.
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self.encoding = None
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#: A list of :class:`Response <Response>` objects from
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#: the history of the Request. Any redirect responses will end
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#: up here. The list is sorted from the oldest to the most recent request.
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self.history = []
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self.reason = None
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#: A CookieJar of Cookies the server sent back.
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self.cookies = cookiejar_from_dict({})
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#: The amount of time elapsed between sending the request
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#: and the arrival of the response (as a timedelta)
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self.elapsed = datetime.timedelta(0)
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def __getstate__(self):
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# Consume everything; accessing the content attribute makes
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# sure the content has been fully read.
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if not self._content_consumed:
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self.content
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return dict(
|
|
(attr, getattr(self, attr, None))
|
|
for attr in self.__attrs__
|
|
)
|
|
|
|
def __setstate__(self, state):
|
|
for name, value in state.items():
|
|
setattr(self, name, value)
|
|
|
|
# pickled objects do not have .raw
|
|
setattr(self, '_content_consumed', True)
|
|
|
|
def __repr__(self):
|
|
return '<Response [%s]>' % (self.status_code)
|
|
|
|
def __bool__(self):
|
|
"""Returns true if :attr:`status_code` is 'OK'."""
|
|
return self.ok
|
|
|
|
def __nonzero__(self):
|
|
"""Returns true if :attr:`status_code` is 'OK'."""
|
|
return self.ok
|
|
|
|
def __iter__(self):
|
|
"""Allows you to use a response as an iterator."""
|
|
return self.iter_content(128)
|
|
|
|
@property
|
|
def ok(self):
|
|
try:
|
|
self.raise_for_status()
|
|
except RequestException:
|
|
return False
|
|
return True
|
|
|
|
@property
|
|
def apparent_encoding(self):
|
|
"""The apparent encoding, provided by the lovely Charade library
|
|
(Thanks, Ian!)."""
|
|
return chardet.detect(self.content)['encoding']
|
|
|
|
def iter_content(self, chunk_size=1, decode_unicode=False):
|
|
"""Iterates over the response data. When stream=True is set on the
|
|
request, this avoids reading the content at once into memory for
|
|
large responses. The chunk size is the number of bytes it should
|
|
read into memory. This is not necessarily the length of each item
|
|
returned as decoding can take place.
|
|
"""
|
|
if self._content_consumed:
|
|
# simulate reading small chunks of the content
|
|
return iter_slices(self._content, chunk_size)
|
|
|
|
def generate():
|
|
try:
|
|
# Special case for urllib3.
|
|
try:
|
|
for chunk in self.raw.stream(chunk_size,
|
|
decode_content=True):
|
|
yield chunk
|
|
except IncompleteRead as e:
|
|
raise ChunkedEncodingError(e)
|
|
except DecodeError as e:
|
|
raise ContentDecodingError(e)
|
|
except AttributeError:
|
|
# Standard file-like object.
|
|
while True:
|
|
chunk = self.raw.read(chunk_size)
|
|
if not chunk:
|
|
break
|
|
yield chunk
|
|
|
|
self._content_consumed = True
|
|
|
|
gen = generate()
|
|
|
|
if decode_unicode:
|
|
gen = stream_decode_response_unicode(gen, self)
|
|
|
|
return gen
|
|
|
|
def iter_lines(self, chunk_size=ITER_CHUNK_SIZE, decode_unicode=None):
|
|
"""Iterates over the response data, one line at a time. When
|
|
stream=True is set on the request, this avoids reading the
|
|
content at once into memory for large responses.
|
|
"""
|
|
|
|
pending = None
|
|
|
|
for chunk in self.iter_content(chunk_size=chunk_size,
|
|
decode_unicode=decode_unicode):
|
|
|
|
if pending is not None:
|
|
chunk = pending + chunk
|
|
lines = chunk.splitlines()
|
|
|
|
if lines and lines[-1] and chunk and lines[-1][-1] == chunk[-1]:
|
|
pending = lines.pop()
|
|
else:
|
|
pending = None
|
|
|
|
for line in lines:
|
|
yield line
|
|
|
|
if pending is not None:
|
|
yield pending
|
|
|
|
@property
|
|
def content(self):
|
|
"""Content of the response, in bytes."""
|
|
|
|
if self._content is False:
|
|
# Read the contents.
|
|
try:
|
|
if self._content_consumed:
|
|
raise RuntimeError(
|
|
'The content for this response was already consumed')
|
|
|
|
if self.status_code == 0:
|
|
self._content = None
|
|
else:
|
|
self._content = bytes().join(self.iter_content(CONTENT_CHUNK_SIZE)) or bytes()
|
|
|
|
except AttributeError:
|
|
self._content = None
|
|
|
|
self._content_consumed = True
|
|
# don't need to release the connection; that's been handled by urllib3
|
|
# since we exhausted the data.
|
|
return self._content
|
|
|
|
@property
|
|
def text(self):
|
|
"""Content of the response, in unicode.
|
|
|
|
If Response.encoding is None, encoding will be guessed using
|
|
``chardet``.
|
|
|
|
The encoding of the response content is determined based soley on HTTP
|
|
headers, following RFC 2616 to the letter. If you can take advantage of
|
|
non-HTTP knowledge to make a better guess at the encoding, you should
|
|
set ``r.encoding`` appropriately before accessing this property.
|
|
"""
|
|
|
|
# Try charset from content-type
|
|
content = None
|
|
encoding = self.encoding
|
|
|
|
if not self.content:
|
|
return str('')
|
|
|
|
# Fallback to auto-detected encoding.
|
|
if self.encoding is None:
|
|
encoding = self.apparent_encoding
|
|
|
|
# Decode unicode from given encoding.
|
|
try:
|
|
content = str(self.content, encoding, errors='replace')
|
|
except (LookupError, TypeError):
|
|
# A LookupError is raised if the encoding was not found which could
|
|
# indicate a misspelling or similar mistake.
|
|
#
|
|
# A TypeError can be raised if encoding is None
|
|
#
|
|
# So we try blindly encoding.
|
|
content = str(self.content, errors='replace')
|
|
|
|
return content
|
|
|
|
def json(self, **kwargs):
|
|
"""Returns the json-encoded content of a response, if any.
|
|
|
|
:param \*\*kwargs: Optional arguments that ``json.loads`` takes.
|
|
"""
|
|
|
|
if not self.encoding and len(self.content) > 3:
|
|
# No encoding set. JSON RFC 4627 section 3 states we should expect
|
|
# UTF-8, -16 or -32. Detect which one to use; If the detection or
|
|
# decoding fails, fall back to `self.text` (using chardet to make
|
|
# a best guess).
|
|
encoding = guess_json_utf(self.content)
|
|
if encoding is not None:
|
|
return json.loads(self.content.decode(encoding), **kwargs)
|
|
return json.loads(self.text, **kwargs)
|
|
|
|
@property
|
|
def links(self):
|
|
"""Returns the parsed header links of the response, if any."""
|
|
|
|
header = self.headers.get('link')
|
|
|
|
# l = MultiDict()
|
|
l = {}
|
|
|
|
if header:
|
|
links = parse_header_links(header)
|
|
|
|
for link in links:
|
|
key = link.get('rel') or link.get('url')
|
|
l[key] = link
|
|
|
|
return l
|
|
|
|
def raise_for_status(self):
|
|
"""Raises stored :class:`HTTPError`, if one occurred."""
|
|
|
|
http_error_msg = ''
|
|
|
|
if 400 <= self.status_code < 500:
|
|
http_error_msg = '%s Client Error: %s' % (self.status_code, self.reason)
|
|
|
|
elif 500 <= self.status_code < 600:
|
|
http_error_msg = '%s Server Error: %s' % (self.status_code, self.reason)
|
|
|
|
if http_error_msg:
|
|
raise HTTPError(http_error_msg, response=self)
|
|
|
|
def close(self):
|
|
"""Closes the underlying file descriptor and releases the connection
|
|
back to the pool.
|
|
|
|
*Note: Should not normally need to be called explicitly.*
|
|
"""
|
|
return self.raw.release_conn()
|