from __future__ import absolute_import, print_function, division import six import time from email.utils import parsedate_tz, formatdate, mktime_tz from netlib import human from netlib import multidict from netlib.http import cookies from netlib.http import headers as nheaders from netlib.http import message from netlib.http import status_codes from typing import AnyStr # noqa from typing import Dict # noqa from typing import Iterable # noqa from typing import Tuple # noqa from typing import Union # noqa class ResponseData(message.MessageData): def __init__( self, http_version, status_code, reason=None, headers=(), content=None, timestamp_start=None, timestamp_end=None ): if isinstance(http_version, six.text_type): http_version = http_version.encode("ascii", "strict") if isinstance(reason, six.text_type): reason = reason.encode("ascii", "strict") if not isinstance(headers, nheaders.Headers): headers = nheaders.Headers(headers) if isinstance(content, six.text_type): raise ValueError("Content must be bytes, not {}".format(type(content).__name__)) self.http_version = http_version self.status_code = status_code self.reason = reason self.headers = headers self.content = content self.timestamp_start = timestamp_start self.timestamp_end = timestamp_end class Response(message.Message): """ An HTTP response. """ def __init__(self, *args, **kwargs): super(Response, self).__init__() self.data = ResponseData(*args, **kwargs) def __repr__(self): if self.raw_content: details = "{}, {}".format( self.headers.get("content-type", "unknown content type"), human.pretty_size(len(self.raw_content)) ) else: details = "no content" return "Response({status_code} {reason}, {details})".format( status_code=self.status_code, reason=self.reason, details=details ) @classmethod def make( cls, status_code=200, # type: int content=b"", # type: AnyStr headers=() # type: Union[Dict[AnyStr, AnyStr], Iterable[Tuple[bytes, bytes]]] ): """ Simplified API for creating response objects. """ resp = cls( b"HTTP/1.1", status_code, status_codes.RESPONSES.get(status_code, "").encode(), (), None ) # Headers can be list or dict, we differentiate here. if isinstance(headers, dict): resp.headers = nheaders.Headers(**headers) elif isinstance(headers, Iterable): resp.headers = nheaders.Headers(headers) else: raise TypeError("Expected headers to be an iterable or dict, but is {}.".format( type(headers).__name__ )) # Assign this manually to update the content-length header. if isinstance(content, bytes): resp.content = content elif isinstance(content, str): resp.text = content else: raise TypeError("Expected content to be str or bytes, but is {}.".format( type(content).__name__ )) return resp @property def status_code(self): """ HTTP Status Code, e.g. ``200``. """ return self.data.status_code @status_code.setter def status_code(self, status_code): self.data.status_code = status_code @property def reason(self): """ HTTP Reason Phrase, e.g. "Not Found". This is always :py:obj:`None` for HTTP2 requests, because HTTP2 responses do not contain a reason phrase. """ return message._native(self.data.reason) @reason.setter def reason(self, reason): self.data.reason = message._always_bytes(reason) @property def cookies(self): # type: () -> multidict.MultiDictView """ The response cookies. A possibly empty :py:class:`~netlib.multidict.MultiDictView`, where the keys are cookie name strings, and values are (value, attr) tuples. Value is a string, and attr is an MultiDictView containing cookie attributes. Within attrs, unary attributes (e.g. HTTPOnly) are indicated by a Null value. Caveats: Updating the attr """ return multidict.MultiDictView( self._get_cookies, self._set_cookies ) def _get_cookies(self): h = self.headers.get_all("set-cookie") return tuple(cookies.parse_set_cookie_headers(h)) def _set_cookies(self, value): cookie_headers = [] for k, v in value: header = cookies.format_set_cookie_header([(k, v[0], v[1])]) cookie_headers.append(header) self.headers.set_all("set-cookie", cookie_headers) @cookies.setter def cookies(self, value): self._set_cookies(value) def refresh(self, now=None): """ This fairly complex and heuristic function refreshes a server response for replay. - It adjusts date, expires and last-modified headers. - It adjusts cookie expiration. """ if not now: now = time.time() delta = now - self.timestamp_start refresh_headers = [ "date", "expires", "last-modified", ] for i in refresh_headers: if i in self.headers: d = parsedate_tz(self.headers[i]) if d: new = mktime_tz(d) + delta self.headers[i] = formatdate(new) c = [] for set_cookie_header in self.headers.get_all("set-cookie"): try: refreshed = cookies.refresh_set_cookie_header(set_cookie_header, delta) except ValueError: refreshed = set_cookie_header c.append(refreshed) if c: self.headers.set_all("set-cookie", c)