/
rewrite_live.py
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/
rewrite_live.py
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"""
Fetch a url from live web and apply rewriting rules
"""
from requests import request as live_request
import mimetypes
import logging
import os
from six.moves.urllib.parse import urlsplit
import six
from warcio.timeutils import timestamp_now
from warcio.statusandheaders import StatusAndHeaders
from pywb.utils.loaders import is_http, LimitReader, LocalFileLoader, to_file_url
from pywb.utils.loaders import extract_client_cookie
from pywb.utils.canonicalize import canonicalize
from pywb.rewrite.rewrite_content import RewriteContent
#=================================================================
class LiveRewriter(object):
def __init__(self, is_framed_replay=False, proxies=None):
self.rewriter = RewriteContent(is_framed_replay=is_framed_replay)
self.proxies = proxies
self.live_request = live_request
if self.proxies:
logging.debug('Live Rewrite via proxy ' + str(proxies))
if isinstance(proxies, str):
self.proxies = {'http': proxies,
'https': proxies}
else:
logging.debug('Live Rewrite Direct (no proxy)')
def is_recording(self):
return self.proxies is not None
def fetch_local_file(self, uri):
#fh = open(uri)
fh = LocalFileLoader().load(uri)
content_type, _ = mimetypes.guess_type(uri)
# create fake headers for local file
status_headers = StatusAndHeaders('200 OK',
[('Content-Type', content_type)])
stream = fh
return (status_headers, stream)
def translate_headers(self, url, urlkey, env):
headers = {}
splits = urlsplit(url)
has_cookies = False
for name, value in six.iteritems(env):
if name == 'HTTP_HOST':
name = 'Host'
value = splits.netloc
elif name == 'HTTP_ORIGIN':
name = 'Origin'
value = (splits.scheme + '://' + splits.netloc)
elif name == 'HTTP_X_CSRFTOKEN':
name = 'X-CSRFToken'
cookie_val = extract_client_cookie(env, 'csrftoken')
if cookie_val:
value = cookie_val
elif name == 'HTTP_REFERER':
continue
elif name == 'HTTP_X_PYWB_REQUESTED_WITH':
continue
elif name == 'HTTP_X_FORWARDED_PROTO':
name = 'X-Forwarded-Proto'
value = splits.scheme
elif name == 'HTTP_COOKIE':
name = 'Cookie'
value = self._req_cookie_rewrite(urlkey, value)
has_cookies = True
elif name.startswith('HTTP_'):
name = name[5:].title().replace('_', '-')
elif name in ('CONTENT_LENGTH', 'CONTENT_TYPE'):
name = name.title().replace('_', '-')
elif name == 'REL_REFERER':
name = 'Referer'
else:
value = None
if value:
headers[name] = value
if not has_cookies:
value = self._req_cookie_rewrite(urlkey, '')
if value:
headers['Cookie'] = value
return headers
def _req_cookie_rewrite(self, urlkey, value):
rule = self.rewriter.ruleset.get_first_match(urlkey)
if not rule or not rule.req_cookie_rewrite:
return value
for cr in rule.req_cookie_rewrite:
try:
value = cr['rx'].sub(cr['replace'], value)
except KeyError:
pass
return value
def fetch_http(self, url,
urlkey=None,
env=None,
req_headers=None,
follow_redirects=False,
skip_recording=False,
verify=True):
method = 'GET'
data = None
proxies = None
if not skip_recording:
proxies = self.proxies
if not req_headers:
req_headers = {}
if env is not None:
method = env['REQUEST_METHOD'].upper()
input_ = env['wsgi.input']
req_headers.update(self.translate_headers(url, urlkey, env))
if method in ('POST', 'PUT'):
len_ = env.get('CONTENT_LENGTH')
if len_:
data = LimitReader(input_, int(len_))
else:
data = input_
response = self.live_request(method=method,
url=url,
data=data,
headers=req_headers,
allow_redirects=follow_redirects,
proxies=proxies,
stream=True,
verify=verify)
statusline = str(response.status_code) + ' ' + response.reason
headers = response.headers.items()
stream = response.raw
try: #pragma: no cover
#PY 3
headers = stream._original_response.headers._headers
except: #pragma: no cover
#PY 2
headers = []
resp_headers = stream._original_response.msg.headers
for h in resp_headers:
n, v = h.split(':', 1)
n = n.strip()
v = v.strip()
headers.append((n, v))
status_headers = StatusAndHeaders(statusline, headers)
return (status_headers, stream)
def fetch_request(self, url, urlrewriter,
head_insert_func=None,
urlkey=None,
env=None,
req_headers={},
timestamp=None,
follow_redirects=False,
skip_recording=False,
verify=True,
remote_only=True):
ts_err = url.split('///')
# fixup for accidental erroneous rewrite which has ///
# (unless file:///)
if len(ts_err) > 1 and ts_err[0] != 'file:':
url = 'http://' + ts_err[1]
if url.startswith('//'):
url = 'http:' + url
if remote_only or is_http(url):
is_remote = True
else:
is_remote = False
if not url.startswith('file:'):
url = to_file_url(url)
# explicit urlkey may be passed in (say for testing)
if not urlkey:
urlkey = canonicalize(url)
if is_remote:
(status_headers, stream) = self.fetch_http(url, urlkey, env,
req_headers,
follow_redirects,
skip_recording,
verify)
else:
(status_headers, stream) = self.fetch_local_file(url)
if timestamp is None:
timestamp = timestamp_now()
cdx = {'urlkey': urlkey,
'timestamp': timestamp,
'url': url,
'status': status_headers.get_statuscode(),
'mime': status_headers.get_header('Content-Type'),
'is_live': True,
}
result = (self.rewriter.
rewrite_content(urlrewriter,
status_headers,
stream,
head_insert_func=head_insert_func,
urlkey=urlkey,
cdx=cdx))
if env:
env['pywb.cdx'] = cdx
return result
def fetch_async(self, url, headers):
resp = self.live_request(method='GET',
url=url,
headers=headers,
proxies=self.proxies,
verify=False,
stream=True)
# don't actually read whole response,
# proxy response for writing it
resp.close()
def add_metadata(self, url, headers, data):
return self.live_request(method='PUTMETA',
url=url,
data=data,
headers=headers,
proxies=self.proxies,
verify=False)
def get_rewritten(self, *args, **kwargs):
result = self.fetch_request(*args, **kwargs)
status_headers, gen, is_rewritten = result
buff = b''.join(gen)
return (status_headers, buff)
def get_video_info(self, url):
return youtubedl.extract_info(url)
#=================================================================
class YoutubeDLWrapper(object): #pragma: no cover
""" YoutubeDL wrapper, inits youtubee-dl if it is available
"""
def __init__(self):
try:
from youtube_dl import YoutubeDL as YoutubeDL
except ImportError:
self.ydl = None
return
self.ydl = YoutubeDL(dict(simulate=True,
youtube_include_dash_manifest=False))
self.ydl.add_default_info_extractors()
def extract_info(self, url):
if not self.ydl:
return None
info = self.ydl.extract_info(url)
return info
#=================================================================
youtubedl = YoutubeDLWrapper()