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214 lines
9.3 KiB
Python
214 lines
9.3 KiB
Python
# Copyright 2010-2020 Kurt McKee <contactme@kurtmckee.org>
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# Copyright 2002-2008 Mark Pilgrim
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# All rights reserved.
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#
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# This file is a part of feedparser.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice,
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# this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice,
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# this list of conditions and the following disclaimer in the documentation
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# and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 'AS IS'
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# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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import base64
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import datetime
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import gzip
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import io
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import re
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import struct
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import urllib.parse
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import urllib.request
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import zlib
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from .datetimes import _parse_date
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from .urls import convert_to_idn
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# HTTP "Accept" header to send to servers when downloading feeds. If you don't
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# want to send an Accept header, set this to None.
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ACCEPT_HEADER = "application/atom+xml,application/rdf+xml,application/rss+xml,application/x-netcdf,application/xml;q=0.9,text/xml;q=0.2,*/*;q=0.1"
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class _FeedURLHandler(urllib.request.HTTPDigestAuthHandler, urllib.request.HTTPRedirectHandler, urllib.request.HTTPDefaultErrorHandler):
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def http_error_default(self, req, fp, code, msg, headers):
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# The default implementation just raises HTTPError.
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# Forget that.
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fp.status = code
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return fp
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def http_error_301(self, req, fp, code, msg, hdrs):
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result = urllib.request.HTTPRedirectHandler.http_error_301(self, req, fp, code, msg, hdrs)
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result.status = code
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result.newurl = result.geturl()
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return result
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# The default implementations in urllib.request.HTTPRedirectHandler
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# are identical, so hardcoding a http_error_301 call above
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# won't affect anything
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http_error_300 = http_error_301
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http_error_302 = http_error_301
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http_error_303 = http_error_301
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http_error_307 = http_error_301
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def http_error_401(self, req, fp, code, msg, headers):
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# Check if
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# - server requires digest auth, AND
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# - we tried (unsuccessfully) with basic auth, AND
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# If all conditions hold, parse authentication information
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# out of the Authorization header we sent the first time
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# (for the username and password) and the WWW-Authenticate
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# header the server sent back (for the realm) and retry
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# the request with the appropriate digest auth headers instead.
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# This evil genius hack has been brought to you by Aaron Swartz.
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host = urllib.parse.urlparse(req.get_full_url())[1]
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if 'Authorization' not in req.headers or 'WWW-Authenticate' not in headers:
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return self.http_error_default(req, fp, code, msg, headers)
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auth = base64.decodebytes(req.headers['Authorization'].split(' ')[1].encode('utf8'))
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user, passw = auth.split(':')
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realm = re.findall('realm="([^"]*)"', headers['WWW-Authenticate'])[0]
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self.add_password(realm, host, user, passw)
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retry = self.http_error_auth_reqed('www-authenticate', host, req, headers)
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self.reset_retry_count()
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return retry
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def _build_urllib2_request(url, agent, accept_header, etag, modified, referrer, auth, request_headers):
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request = urllib.request.Request(url)
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request.add_header('User-Agent', agent)
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if etag:
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request.add_header('If-None-Match', etag)
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if isinstance(modified, str):
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modified = _parse_date(modified)
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elif isinstance(modified, datetime.datetime):
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modified = modified.utctimetuple()
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if modified:
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# format into an RFC 1123-compliant timestamp. We can't use
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# time.strftime() since the %a and %b directives can be affected
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# by the current locale, but RFC 2616 states that dates must be
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# in English.
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short_weekdays = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun']
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months = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec']
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request.add_header('If-Modified-Since', '%s, %02d %s %04d %02d:%02d:%02d GMT' % (short_weekdays[modified[6]], modified[2], months[modified[1] - 1], modified[0], modified[3], modified[4], modified[5]))
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if referrer:
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request.add_header('Referer', referrer)
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request.add_header('Accept-encoding', 'gzip, deflate')
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if auth:
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request.add_header('Authorization', 'Basic %s' % auth)
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if accept_header:
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request.add_header('Accept', accept_header)
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# use this for whatever -- cookies, special headers, etc
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# [('Cookie','Something'),('x-special-header','Another Value')]
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for header_name, header_value in request_headers.items():
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request.add_header(header_name, header_value)
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request.add_header('A-IM', 'feed') # RFC 3229 support
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return request
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def get(url, etag=None, modified=None, agent=None, referrer=None, handlers=None, request_headers=None, result=None):
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if handlers is None:
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handlers = []
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elif not isinstance(handlers, list):
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handlers = [handlers]
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if request_headers is None:
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request_headers = {}
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# Deal with the feed URI scheme
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if url.startswith('feed:http'):
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url = url[5:]
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elif url.startswith('feed:'):
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url = 'http:' + url[5:]
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if not agent:
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from . import USER_AGENT
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agent = USER_AGENT
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# Test for inline user:password credentials for HTTP basic auth
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auth = None
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if not url.startswith('ftp:'):
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url_pieces = urllib.parse.urlparse(url)
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if url_pieces.username:
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new_pieces = list(url_pieces)
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new_pieces[1] = url_pieces.hostname
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if url_pieces.port:
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new_pieces[1] = f'{url_pieces.hostname}:{url_pieces.port}'
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url = urllib.parse.urlunparse(new_pieces)
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auth = base64.standard_b64encode(f'{url_pieces.username}:{url_pieces.password}').strip()
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# iri support
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if not isinstance(url, bytes):
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url = convert_to_idn(url)
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# try to open with urllib2 (to use optional headers)
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request = _build_urllib2_request(url, agent, ACCEPT_HEADER, etag, modified, referrer, auth, request_headers)
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opener = urllib.request.build_opener(*tuple(handlers + [_FeedURLHandler()]))
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opener.addheaders = [] # RMK - must clear so we only send our custom User-Agent
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f = opener.open(request)
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data = f.read()
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f.close()
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# lowercase all of the HTTP headers for comparisons per RFC 2616
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result['headers'] = {k.lower(): v for k, v in f.headers.items()}
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# if feed is gzip-compressed, decompress it
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if data and 'gzip' in result['headers'].get('content-encoding', ''):
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try:
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data = gzip.GzipFile(fileobj=io.BytesIO(data)).read()
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except (EOFError, IOError, struct.error) as e:
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# IOError can occur if the gzip header is bad.
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# struct.error can occur if the data is damaged.
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result['bozo'] = True
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result['bozo_exception'] = e
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if isinstance(e, struct.error):
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# A gzip header was found but the data is corrupt.
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# Ideally, we should re-request the feed without the
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# 'Accept-encoding: gzip' header, but we don't.
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data = None
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elif data and 'deflate' in result['headers'].get('content-encoding', ''):
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try:
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data = zlib.decompress(data)
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except zlib.error:
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try:
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# The data may have no headers and no checksum.
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data = zlib.decompress(data, -15)
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except zlib.error as e:
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result['bozo'] = True
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result['bozo_exception'] = e
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# save HTTP headers
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if 'etag' in result['headers']:
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etag = result['headers'].get('etag', '')
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if isinstance(etag, bytes):
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etag = etag.decode('utf-8', 'ignore')
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if etag:
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result['etag'] = etag
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if 'last-modified' in result['headers']:
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modified = result['headers'].get('last-modified', '')
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if modified:
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result['modified'] = modified
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result['modified_parsed'] = _parse_date(modified)
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if isinstance(f.url, bytes):
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result['href'] = f.url.decode('utf-8', 'ignore')
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else:
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result['href'] = f.url
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result['status'] = getattr(f, 'status', 200)
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# Stop processing if the server sent HTTP 304 Not Modified.
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if getattr(f, 'code', 0) == 304:
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result['version'] = ''
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result['debug_message'] = 'The feed has not changed since you last checked, ' + \
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'so the server sent no data. This is a feature, not a bug!'
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return data
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