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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
from typing import Dict
from typing import Iterable
from typing import Tuple
from typing import Union
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, str):
http_version = http_version.encode("ascii", "strict")
if isinstance(reason, str):
reason = reason.encode("ascii", "strict")
if not isinstance(headers, nheaders.Headers):
headers = nheaders.Headers(headers)
if isinstance(content, str):
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().__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: int=200,
content: AnyStr=b"",
headers: 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) -> 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)
|
