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"""
This module implements the Response class which is used to represent HTTP
responses in Scrapy.
See documentation in docs/topics/request-response.rst
"""
from typing import Generator
from urllib.parse import urljoin
from scrapy.exceptions import NotSupported
from scrapy.http.common import obsolete_setter
from scrapy.http.headers import Headers
from scrapy.http.request import Request
from scrapy.link import Link
from scrapy.utils.trackref import object_ref
class Response(object_ref):
def __init__(self, url, status=200, headers=None, body=b'', flags=None,
request=None, certificate=None, ip_address=None):
self.headers = Headers(headers or {})
self.status = int(status)
self._set_body(body)
self._set_url(url)
self.request = request
self.flags = [] if flags is None else list(flags)
self.certificate = certificate
self.ip_address = ip_address
@property
def cb_kwargs(self):
try:
return self.request.cb_kwargs
except AttributeError:
raise AttributeError(
"Response.cb_kwargs not available, this response "
"is not tied to any request"
)
@property
def meta(self):
try:
return self.request.meta
except AttributeError:
raise AttributeError(
"Response.meta not available, this response "
"is not tied to any request"
)
def _get_url(self):
return self._url
def _set_url(self, url):
if isinstance(url, str):
self._url = url
else:
raise TypeError(f'{type(self).__name__} url must be str, '
f'got {type(url).__name__}')
url = property(_get_url, obsolete_setter(_set_url, 'url'))
def _get_body(self):
return self._body
def _set_body(self, body):
if body is None:
self._body = b''
elif not isinstance(body, bytes):
raise TypeError(
"Response body must be bytes. "
"If you want to pass unicode body use TextResponse "
"or HtmlResponse.")
else:
self._body = body
body = property(_get_body, obsolete_setter(_set_body, 'body'))
def __str__(self):
return f"<{self.status} {self.url}>"
__repr__ = __str__
def copy(self):
"""Return a copy of this Response"""
return self.replace()
def replace(self, *args, **kwargs):
"""Create a new Response with the same attributes except for those
given new values.
"""
for x in ['url', 'status', 'headers', 'body',
'request', 'flags', 'certificate', 'ip_address']:
kwargs.setdefault(x, getattr(self, x))
cls = kwargs.pop('cls', self.__class__)
return cls(*args, **kwargs)
def urljoin(self, url):
"""Join this Response's url with a possible relative url to form an
absolute interpretation of the latter."""
return urljoin(self.url, url)
@property
def text(self):
"""For subclasses of TextResponse, this will return the body
as str
"""
raise AttributeError("Response content isn't text")
def css(self, *a, **kw):
"""Shortcut method implemented only by responses whose content
is text (subclasses of TextResponse).
"""
raise NotSupported("Response content isn't text")
def xpath(self, *a, **kw):
"""Shortcut method implemented only by responses whose content
is text (subclasses of TextResponse).
"""
raise NotSupported("Response content isn't text")
def follow(self, url, callback=None, method='GET', headers=None, body=None,
cookies=None, meta=None, encoding='utf-8', priority=0,
dont_filter=False, errback=None, cb_kwargs=None, flags=None):
# type: (...) -> Request
"""
Return a :class:`~.Request` instance to follow a link ``url``.
It accepts the same arguments as ``Request.__init__`` method,
but ``url`` can be a relative URL or a ``scrapy.link.Link`` object,
not only an absolute URL.
:class:`~.TextResponse` provides a :meth:`~.TextResponse.follow`
method which supports selectors in addition to absolute/relative URLs
and Link objects.
.. versionadded:: 2.0
The *flags* parameter.
"""
if isinstance(url, Link):
url = url.url
elif url is None:
raise ValueError("url can't be None")
url = self.urljoin(url)
return Request(
url=url,
callback=callback,
method=method,
headers=headers,
body=body,
cookies=cookies,
meta=meta,
encoding=encoding,
priority=priority,
dont_filter=dont_filter,
errback=errback,
cb_kwargs=cb_kwargs,
flags=flags,
)
def follow_all(self, urls, callback=None, method='GET', headers=None, body=None,
cookies=None, meta=None, encoding='utf-8', priority=0,
dont_filter=False, errback=None, cb_kwargs=None, flags=None):
# type: (...) -> Generator[Request, None, None]
"""
.. versionadded:: 2.0
Return an iterable of :class:`~.Request` instances to follow all links
in ``urls``. It accepts the same arguments as ``Request.__init__`` method,
but elements of ``urls`` can be relative URLs or :class:`~scrapy.link.Link` objects,
not only absolute URLs.
:class:`~.TextResponse` provides a :meth:`~.TextResponse.follow_all`
method which supports selectors in addition to absolute/relative URLs
and Link objects.
"""
if not hasattr(urls, '__iter__'):
raise TypeError("'urls' argument must be an iterable")
return (
self.follow(
url=url,
callback=callback,
method=method,
headers=headers,
body=body,
cookies=cookies,
meta=meta,
encoding=encoding,
priority=priority,
dont_filter=dont_filter,
errback=errback,
cb_kwargs=cb_kwargs,
flags=flags,
)
for url in urls
)
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