mirror of https://github.com/scrapy/scrapy.git
85 lines
2.8 KiB
Python
85 lines
2.8 KiB
Python
"""
|
|
This module provides some useful functions for working with
|
|
scrapy.http.Response objects
|
|
"""
|
|
import os
|
|
import weakref
|
|
import webbrowser
|
|
import tempfile
|
|
|
|
from twisted.web import http
|
|
from scrapy.utils.python import to_bytes, to_native_str
|
|
from w3lib import html
|
|
|
|
from scrapy.utils.decorators import deprecated
|
|
|
|
|
|
@deprecated
|
|
def body_or_str(*a, **kw):
|
|
from scrapy.utils.iterators import _body_or_str
|
|
return _body_or_str(*a, **kw)
|
|
|
|
|
|
_baseurl_cache = weakref.WeakKeyDictionary()
|
|
def get_base_url(response):
|
|
"""Return the base url of the given response, joined with the response url"""
|
|
if response not in _baseurl_cache:
|
|
text = response.text[0:4096]
|
|
_baseurl_cache[response] = html.get_base_url(text, response.url,
|
|
response.encoding)
|
|
return _baseurl_cache[response]
|
|
|
|
|
|
_metaref_cache = weakref.WeakKeyDictionary()
|
|
def get_meta_refresh(response, ignore_tags=('script', 'noscript')):
|
|
"""Parse the http-equiv refrsh parameter from the given response"""
|
|
if response not in _metaref_cache:
|
|
text = response.text[0:4096]
|
|
_metaref_cache[response] = html.get_meta_refresh(text, response.url,
|
|
response.encoding, ignore_tags=ignore_tags)
|
|
return _metaref_cache[response]
|
|
|
|
|
|
def response_status_message(status):
|
|
"""Return status code plus status text descriptive message
|
|
"""
|
|
message = http.RESPONSES.get(int(status), "Unknown Status")
|
|
return '%s %s' % (status, to_native_str(message))
|
|
|
|
|
|
def response_httprepr(response):
|
|
"""Return raw HTTP representation (as bytes) of the given response. This
|
|
is provided only for reference, since it's not the exact stream of bytes
|
|
that was received (that's not exposed by Twisted).
|
|
"""
|
|
s = b"HTTP/1.1 " + to_bytes(str(response.status)) + b" " + \
|
|
to_bytes(http.RESPONSES.get(response.status, b'')) + b"\r\n"
|
|
if response.headers:
|
|
s += response.headers.to_string() + b"\r\n"
|
|
s += b"\r\n"
|
|
s += response.body
|
|
return s
|
|
|
|
|
|
def open_in_browser(response, _openfunc=webbrowser.open):
|
|
"""Open the given response in a local web browser, populating the <base>
|
|
tag for external links to work
|
|
"""
|
|
from scrapy.http import HtmlResponse, TextResponse
|
|
# XXX: this implementation is a bit dirty and could be improved
|
|
body = response.body
|
|
if isinstance(response, HtmlResponse):
|
|
if b'<base' not in body:
|
|
repl = '<head><base href="%s">' % response.url
|
|
body = body.replace(b'<head>', to_bytes(repl))
|
|
ext = '.html'
|
|
elif isinstance(response, TextResponse):
|
|
ext = '.txt'
|
|
else:
|
|
raise TypeError("Unsupported response type: %s" %
|
|
response.__class__.__name__)
|
|
fd, fname = tempfile.mkstemp(ext)
|
|
os.write(fd, body)
|
|
os.close(fd)
|
|
return _openfunc("file://%s" % fname)
|