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[utils] Rework URL path munging for ., .. components 

* move processing to YoutubeDLHandler
* also process `Location` header for redirect
* use tests from https://github.com/yt-dlp/yt-dlp/pull/7662
This commit is contained in:
dirkf 2023-07-28 06:19:15 +01:00
parent e7926ae9f4
commit abef53466d
4 changed files with 95 additions and 41 deletions
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14
test/test_http.py
View File

@ -180,6 +180,12 @@ class HTTPTestRequestHandler(compat_http_server.BaseHTTPRequestHandler):
respond()
elif self.path == '/%c7%9f':
respond()
elif self.path == '/redirect_dotsegments':
self.send_response(301)
# redirect to /headers but with dot segments before
self.send_header('Location', '/a/b/./../../headers')
self.send_header('Content-Length', '0')
self.end_headers()
elif self.path.startswith('/redirect_'):
self._redirect()
elif self.path.startswith('/method'):
@ -489,6 +495,14 @@ class TestHTTP(unittest.TestCase):
self.assertEqual(res.headers.get('Content-Encoding'), 'unsupported')
self.assertEqual(res.read(), b'raw')
def test_remove_dot_segments(self):
with FakeYDL() as ydl:
res = ydl.urlopen(sanitized_Request(self._test_url('a/b/./../../headers')))
self.assertEqual(compat_urllib_parse.urlparse(res.geturl()).path, '/headers')
res = ydl.urlopen(sanitized_Request(self._test_url('redirect_dotsegments')))
self.assertEqual(compat_urllib_parse.urlparse(res.geturl()).path, '/headers')
def _build_proxy_handler(name):
class HTTPTestRequestHandler(compat_http_server.BaseHTTPRequestHandler):

29
test/test_utils.py
View File

@ -64,6 +64,7 @@ from youtube_dl.utils import (
parse_age_limit,
parse_duration,
parse_filesize,
parse_codecs,
parse_count,
parse_iso8601,
parse_resolution,
@ -114,7 +115,7 @@ from youtube_dl.utils import (
cli_option,
cli_valueless_option,
cli_bool_option,
parse_codecs,
YoutubeDLHandler,
)
from youtube_dl.compat import (
compat_chr,
@ -905,6 +906,32 @@ class TestUtil(unittest.TestCase):
)
self.assertEqual(escape_url('http://vimeo.com/56015672#at=0'), 'http://vimeo.com/56015672#at=0')
def test_remove_dot_segments(self):
def remove_dot_segments(p):
q = '' if p.startswith('/') else '/'
p = 'http://example.com' + q + p
p = compat_urlparse.urlsplit(YoutubeDLHandler._fix_path(p)).path
return p[1:] if q else p
self.assertEqual(remove_dot_segments('/a/b/c/./../../g'), '/a/g')
self.assertEqual(remove_dot_segments('mid/content=5/../6'), 'mid/6')
self.assertEqual(remove_dot_segments('/ad/../cd'), '/cd')
self.assertEqual(remove_dot_segments('/ad/../cd/'), '/cd/')
self.assertEqual(remove_dot_segments('/..'), '/')
self.assertEqual(remove_dot_segments('/./'), '/')
self.assertEqual(remove_dot_segments('/./a'), '/a')
self.assertEqual(remove_dot_segments('/abc/./.././d/././e/.././f/./../../ghi'), '/ghi')
self.assertEqual(remove_dot_segments('/'), '/')
self.assertEqual(remove_dot_segments('/t'), '/t')
self.assertEqual(remove_dot_segments('t'), 't')
self.assertEqual(remove_dot_segments(''), '')
self.assertEqual(remove_dot_segments('/../a/b/c'), '/a/b/c')
self.assertEqual(remove_dot_segments('../a'), 'a')
self.assertEqual(remove_dot_segments('./a'), 'a')
self.assertEqual(remove_dot_segments('.'), '')
self.assertEqual(remove_dot_segments('////'), '////')
def test_js_to_json_vars_strings(self):
self.assertDictEqual(
json.loads(js_to_json(

23
youtube_dl/YoutubeDL.py
View File

@ -71,7 +71,6 @@ from .utils import (
format_bytes,
formatSeconds,
GeoRestrictedError,
HEADRequest,
int_or_none,
ISO3166Utils,
join_nonempty,
@ -88,7 +87,6 @@ from .utils import (
preferredencoding,
prepend_extension,
process_communicate_or_kill,
PUTRequest,
register_socks_protocols,
render_table,
replace_extension,
@ -2460,27 +2458,6 @@ class YoutubeDL(object):
""" Start an HTTP download """
if isinstance(req, compat_basestring):
req = sanitized_Request(req)
# an embedded /../ sequence is not automatically handled by urllib2
# see https://github.com/yt-dlp/yt-dlp/issues/3355
url = req.get_full_url()
parts = url.partition('/../')
if parts[1]:
url = compat_urllib_parse.urljoin(parts[0] + parts[1][:1], parts[1][1:] + parts[2])
if url:
# worse, URL path may have initial /../ against RFCs: work-around
# by stripping such prefixes, like eg Firefox
parts = compat_urllib_parse.urlsplit(url)
path = parts.path
while path.startswith('/../'):
path = path[3:]
url = parts._replace(path=path).geturl()
# get a new Request with the munged URL
if url != req.get_full_url():
req_type = {'HEAD': HEADRequest, 'PUT': PUTRequest}.get(
req.get_method(), compat_urllib_request.Request)
req = req_type(
url, data=req.data, headers=dict(req.header_items()),
origin_req_host=req.origin_req_host, unverifiable=req.unverifiable)
return self._opener.open(req, timeout=self._socket_timeout)
def print_debug_header(self):

70
youtube_dl/utils.py
View File

@ -2678,17 +2678,52 @@ class YoutubeDLHandler(compat_urllib_request.HTTPHandler):
def compress(data):
return data and ncompress.decompress(data)
@staticmethod
def _fix_path(url):
# an embedded /../ or /./ sequence is not automatically handled by urllib2
# see https://github.com/yt-dlp/yt-dlp/issues/3355
parsed_url = compat_urllib_parse.urlsplit(url)
path = parsed_url.path
if not path.endswith('/'):
path += '/'
parts = path.partition('/./')
if not parts[1]:
parts = path.partition('/../')
if parts[1]:
path = compat_urllib_parse.urljoin(
parts[0] + parts[1][:1],
parts[1][1:] + (parts[2] if parsed_url.path.endswith('/') else parts[2][:-1]))
url = parsed_url._replace(path=path).geturl()
if '/.' in url:
# worse, URL path may have initial /../ against RFCs: work-around
# by stripping such prefixes, like eg Firefox
path = parsed_url.path + '/'
while path.startswith('/.'):
if path.startswith('/../'):
path = path[3:]
elif path.startswith('/./'):
path = path[2:]
else:
break
path = path[:-1]
if not path.startswith('/') and parsed_url.path.startswith('/'):
path = '/' + path
url = parsed_url._replace(path=path).geturl()
return url
def http_request(self, req):
# According to RFC 3986, URLs can not contain non-ASCII characters, however this is not
# always respected by websites, some tend to give out URLs with non percent-encoded
url = req.get_full_url()
# resolve embedded . and ..
url_fixed = self._fix_path(url)
# According to RFC 3986, URLs can not contain non-ASCII characters; however this is not
# always respected by websites: some tend to give out URLs with non percent-encoded
# non-ASCII characters (see telemb.py, ard.py [#3412])
# urllib chokes on URLs with non-ASCII characters (see http://bugs.python.org/issue3991)
# To work around aforementioned issue we will replace request's original URL with
# percent-encoded one
# Since redirects are also affected (e.g. http://www.southpark.de/alle-episoden/s18e09)
# the code of this workaround has been moved here from YoutubeDL.urlopen()
url = req.get_full_url()
url_escaped = escape_url(url)
url_escaped = escape_url(url_fixed)
# Substitute URL if any change after escaping
if url != url_escaped:
@ -2702,10 +2737,13 @@ class YoutubeDLHandler(compat_urllib_request.HTTPHandler):
req.headers = handle_youtubedl_headers(req.headers)
if sys.version_info < (2, 7) and '#' in req.get_full_url():
# Python 2.6 is brain-dead when it comes to fragments
req._Request__original = req._Request__original.partition('#')[0]
req._Request__r_type = req._Request__r_type.partition('#')[0]
if sys.version_info < (2, 7):
# avoid possible race where __r_type may be unset
req.get_type()
if '#' in req.get_full_url():
# Python 2.6 is brain-dead when it comes to fragments
req._Request__original = req._Request__original.partition('#')[0]
req._Request__r_type = req._Request__r_type.partition('#')[0]
# Use the totally undocumented AbstractHTTPHandler per
# https://github.com/yt-dlp/yt-dlp/pull/4158
@ -2775,10 +2813,13 @@ class YoutubeDLHandler(compat_urllib_request.HTTPHandler):
if sys.version_info >= (3, 0):
location = location.encode('iso-8859-1')
location = location.decode('utf-8')
location_escaped = escape_url(location)
# resolve embedded . and ..
location_fixed = self._fix_path(location)
location_escaped = escape_url(location_fixed)
if location != location_escaped:
del resp.headers['Location']
if sys.version_info < (3, 0):
# if sys.version_info < (3, 0):
if not isinstance(location_escaped, str):
location_escaped = location_escaped.encode('utf-8')
resp.headers['Location'] = location_escaped
return resp
@ -4248,13 +4289,8 @@ def update_Request(req, url=None, data=None, headers={}, query={}):
req_headers.update(headers)
req_data = data if data is not None else req.data
req_url = update_url_query(url or req.get_full_url(), query)
req_get_method = req.get_method()
if req_get_method == 'HEAD':
req_type = HEADRequest
elif req_get_method == 'PUT':
req_type = PUTRequest
else:
req_type = compat_urllib_request.Request
req_type = {'HEAD': HEADRequest, 'PUT': PUTRequest}.get(
req.get_method(), compat_urllib_request.Request)
new_req = req_type(
req_url, data=req_data, headers=req_headers,
origin_req_host=req.origin_req_host, unverifiable=req.unverifiable)