mirror of
https://github.com/webrecorder/pywb.git
synced 2025-03-25 23:47:47 +01:00
e4bcef1c8b
data for HTMLRewriter, since they are never rewritten, and to avoid semicolon ambiguity, since no way to determine if there is a ; or not at end. Addresses #43
350 lines
11 KiB
Python
350 lines
11 KiB
Python
#!/usr/bin/env python
|
|
# -*- coding: utf-8 -*-
|
|
|
|
import sys
|
|
import re
|
|
|
|
from HTMLParser import HTMLParser, HTMLParseError
|
|
|
|
from url_rewriter import UrlRewriter
|
|
from regex_rewriters import JSRewriter, CSSRewriter
|
|
|
|
import cgi
|
|
|
|
|
|
#=================================================================
|
|
class HTMLRewriterMixin(object):
|
|
"""
|
|
HTML-Parsing Rewriter for custom rewriting, also delegates
|
|
to rewriters for script and css
|
|
"""
|
|
|
|
@staticmethod
|
|
def _init_rewrite_tags(defmod):
|
|
rewrite_tags = {
|
|
'a': {'href': defmod},
|
|
'applet': {'codebase': 'oe_',
|
|
'archive': 'oe_'},
|
|
'area': {'href': defmod},
|
|
'base': {'href': defmod},
|
|
'blockquote': {'cite': defmod},
|
|
'body': {'background': 'im_'},
|
|
'del': {'cite': defmod},
|
|
'embed': {'src': 'oe_'},
|
|
'head': {'': defmod}, # for head rewriting
|
|
'iframe': {'src': 'if_'},
|
|
'img': {'src': 'im_'},
|
|
'ins': {'cite': defmod},
|
|
'input': {'src': 'im_'},
|
|
'form': {'action': defmod},
|
|
'frame': {'src': 'fr_'},
|
|
'link': {'href': 'oe_'},
|
|
'meta': {'content': defmod},
|
|
'object': {'codebase': 'oe_',
|
|
'data': 'oe_'},
|
|
'q': {'cite': defmod},
|
|
'ref': {'href': 'oe_'},
|
|
'script': {'src': 'js_'},
|
|
'source': {'src': 'oe_'},
|
|
'div': {'data-src': defmod,
|
|
'data-uri': defmod},
|
|
'li': {'data-src': defmod,
|
|
'data-uri': defmod},
|
|
}
|
|
|
|
return rewrite_tags
|
|
|
|
STATE_TAGS = ['script', 'style']
|
|
|
|
# tags allowed in the <head> of an html document
|
|
HEAD_TAGS = ['html', 'head', 'base', 'link', 'meta',
|
|
'title', 'style', 'script', 'object', 'bgsound']
|
|
|
|
DATA_RW_PROTOCOLS = ('http://', 'https://', '//')
|
|
|
|
#===========================
|
|
class AccumBuff:
|
|
def __init__(self):
|
|
self.ls = []
|
|
|
|
def write(self, string):
|
|
self.ls.append(bytes(string))
|
|
|
|
def getvalue(self):
|
|
return b''.join(self.ls)
|
|
|
|
# ===========================
|
|
def __init__(self, url_rewriter,
|
|
head_insert=None,
|
|
js_rewriter_class=JSRewriter,
|
|
css_rewriter_class=CSSRewriter,
|
|
defmod='',
|
|
parse_comments=False):
|
|
|
|
self.url_rewriter = url_rewriter
|
|
self._wb_parse_context = None
|
|
|
|
self.js_rewriter = js_rewriter_class(url_rewriter)
|
|
self.css_rewriter = css_rewriter_class(url_rewriter)
|
|
|
|
self.head_insert = head_insert
|
|
self.parse_comments = parse_comments
|
|
|
|
self.rewrite_tags = self._init_rewrite_tags(defmod)
|
|
|
|
# ===========================
|
|
META_REFRESH_REGEX = re.compile('^[\\d.]+\\s*;\\s*url\\s*=\\s*(.+?)\\s*$',
|
|
re.IGNORECASE | re.MULTILINE)
|
|
|
|
def _rewrite_meta_refresh(self, meta_refresh):
|
|
if not meta_refresh:
|
|
return None
|
|
|
|
m = self.META_REFRESH_REGEX.match(meta_refresh)
|
|
if not m:
|
|
return meta_refresh
|
|
|
|
meta_refresh = (meta_refresh[:m.start(1)] +
|
|
self._rewrite_url(m.group(1)) +
|
|
meta_refresh[m.end(1):])
|
|
|
|
return meta_refresh
|
|
# ===========================
|
|
|
|
def _rewrite_url(self, value, mod=None):
|
|
if value:
|
|
return self.url_rewriter.rewrite(value, mod)
|
|
else:
|
|
return None
|
|
|
|
def _rewrite_css(self, css_content):
|
|
if css_content:
|
|
return self.css_rewriter.rewrite(css_content)
|
|
else:
|
|
return None
|
|
|
|
def _rewrite_script(self, script_content):
|
|
if script_content:
|
|
return self.js_rewriter.rewrite(script_content)
|
|
else:
|
|
return None
|
|
|
|
def has_attr(self, tag_attrs, attr):
|
|
name, value = attr
|
|
for attr_name, attr_value in tag_attrs:
|
|
if attr_name == name:
|
|
return value.lower() == attr_value.lower()
|
|
return False
|
|
|
|
def _rewrite_tag_attrs(self, tag, tag_attrs):
|
|
# special case: script or style parse context
|
|
if ((tag in self.STATE_TAGS) and not self._wb_parse_context):
|
|
self._wb_parse_context = tag
|
|
|
|
# special case: head insertion, non-head tags
|
|
elif (self.head_insert and
|
|
not self._wb_parse_context
|
|
and (tag not in self.HEAD_TAGS)):
|
|
self.out.write(self.head_insert)
|
|
self.head_insert = None
|
|
|
|
# attr rewriting
|
|
handler = self.rewrite_tags.get(tag)
|
|
if not handler:
|
|
handler = self.rewrite_tags.get('')
|
|
|
|
if not handler:
|
|
return False
|
|
|
|
self.out.write('<' + tag)
|
|
|
|
for attr_name, attr_value in tag_attrs:
|
|
|
|
# special case: inline JS/event handler
|
|
if ((attr_value and attr_value.startswith('javascript:'))
|
|
or attr_name.startswith('on')):
|
|
attr_value = self._rewrite_script(attr_value)
|
|
|
|
# special case: inline CSS/style attribute
|
|
elif attr_name == 'style':
|
|
attr_value = self._rewrite_css(attr_value)
|
|
|
|
# special case: disable crossorigin attr
|
|
# as they may interfere with rewriting semantics
|
|
elif attr_name == 'crossorigin':
|
|
attr_name = '_crossorigin'
|
|
|
|
# special case: meta tag
|
|
elif (tag == 'meta') and (attr_name == 'content'):
|
|
if self.has_attr(tag_attrs, ('http-equiv', 'refresh')):
|
|
attr_value = self._rewrite_meta_refresh(attr_value)
|
|
|
|
# special case: data- attrs
|
|
elif attr_name and attr_value and attr_name.startswith('data-'):
|
|
if attr_value.startswith(self.DATA_RW_PROTOCOLS):
|
|
rw_mod = 'oe_'
|
|
attr_value = self._rewrite_url(attr_value, rw_mod)
|
|
|
|
else:
|
|
# rewrite url using tag handler
|
|
rw_mod = handler.get(attr_name)
|
|
if rw_mod is not None:
|
|
attr_value = self._rewrite_url(attr_value, rw_mod)
|
|
|
|
# special case: base tag
|
|
if (tag == 'base') and (attr_name == 'href') and attr_value:
|
|
self.url_rewriter = (self.url_rewriter.
|
|
rebase_rewriter(attr_value))
|
|
|
|
# write the attr!
|
|
self._write_attr(attr_name, attr_value)
|
|
|
|
return True
|
|
|
|
def _rewrite_head(self, start_end):
|
|
# special case: head tag
|
|
|
|
# if no insert or in context, no rewrite
|
|
if not self.head_insert or self._wb_parse_context:
|
|
return False
|
|
|
|
self.out.write('>')
|
|
self.out.write(self.head_insert)
|
|
self.head_insert = None
|
|
|
|
if start_end:
|
|
self.out.write('</head>')
|
|
|
|
return True
|
|
|
|
def _write_attr(self, name, value):
|
|
# parser doesn't differentiate between 'attr=""' and just 'attr'
|
|
# 'attr=""' is more common, so use that form
|
|
if value:
|
|
self.out.write(' ' + name + '="' + value + '"')
|
|
else:
|
|
self.out.write(' ' + name + '=""')
|
|
|
|
def parse_data(self, data):
|
|
if self._wb_parse_context == 'script':
|
|
data = self._rewrite_script(data)
|
|
elif self._wb_parse_context == 'style':
|
|
data = self._rewrite_css(data)
|
|
|
|
self.out.write(data)
|
|
|
|
def rewrite(self, string):
|
|
self.out = self.AccumBuff()
|
|
|
|
self.feed(string)
|
|
|
|
result = self.out.getvalue()
|
|
|
|
# Clear buffer to create new one for next rewrite()
|
|
self.out = None
|
|
|
|
return result
|
|
|
|
def close(self):
|
|
self.out = self.AccumBuff()
|
|
|
|
self._internal_close()
|
|
|
|
result = self.out.getvalue()
|
|
|
|
# Clear buffer to create new one for next rewrite()
|
|
self.out = None
|
|
|
|
return result
|
|
|
|
def _internal_close(self): # pragma: no cover
|
|
raise NotImplementedError('Base method')
|
|
|
|
|
|
#=================================================================
|
|
class HTMLRewriter(HTMLRewriterMixin, HTMLParser):
|
|
PARSETAG = re.compile('[<]')
|
|
|
|
def __init__(self, *args, **kwargs):
|
|
HTMLParser.__init__(self)
|
|
super(HTMLRewriter, self).__init__(*args, **kwargs)
|
|
|
|
def reset(self):
|
|
HTMLParser.reset(self)
|
|
self.interesting = self.PARSETAG
|
|
|
|
def clear_cdata_mode(self):
|
|
HTMLParser.clear_cdata_mode(self)
|
|
self.interesting = self.PARSETAG
|
|
|
|
def feed(self, string):
|
|
try:
|
|
HTMLParser.feed(self, string)
|
|
except HTMLParseError: # pragma: no cover
|
|
# only raised in 2.6
|
|
self.out.write(string)
|
|
|
|
def _internal_close(self):
|
|
if (self._wb_parse_context):
|
|
end_tag = '</' + self._wb_parse_context + '>'
|
|
self.feed(end_tag)
|
|
self._wb_parse_context = None
|
|
|
|
try:
|
|
HTMLParser.close(self)
|
|
except HTMLParseError: # pragma: no cover
|
|
# only raised in 2.6
|
|
pass
|
|
|
|
# called to unescape attrs -- do not unescape!
|
|
def unescape(self, s):
|
|
return s
|
|
|
|
def handle_starttag(self, tag, attrs):
|
|
if not self._rewrite_tag_attrs(tag, attrs):
|
|
self.out.write(self.get_starttag_text())
|
|
elif tag != 'head' or not self._rewrite_head(False):
|
|
self.out.write('>')
|
|
|
|
def handle_startendtag(self, tag, attrs):
|
|
if not self._rewrite_tag_attrs(tag, attrs):
|
|
self.out.write(self.get_starttag_text())
|
|
elif tag != 'head' or not self._rewrite_head(True):
|
|
self.out.write('/>')
|
|
|
|
def handle_endtag(self, tag):
|
|
if (tag == self._wb_parse_context):
|
|
self._wb_parse_context = None
|
|
|
|
self.out.write('</' + tag + '>')
|
|
|
|
def handle_data(self, data):
|
|
self.parse_data(data)
|
|
|
|
# overriding regex so that these are no longer called
|
|
#def handle_entityref(self, data):
|
|
# self.out.write('&' + data + ';')
|
|
#
|
|
#def handle_charref(self, data):
|
|
# self.out.write('&#' + data + ';')
|
|
|
|
def handle_comment(self, data):
|
|
self.out.write('<!--')
|
|
if self.parse_comments:
|
|
data = self._rewrite_script(data)
|
|
self.out.write(data)
|
|
else:
|
|
self.parse_data(data)
|
|
self.out.write('-->')
|
|
|
|
def handle_decl(self, data):
|
|
self.out.write('<!' + data + '>')
|
|
|
|
def handle_pi(self, data):
|
|
self.out.write('<?' + data + '>')
|
|
|
|
def unknown_decl(self, data):
|
|
self.out.write('<![')
|
|
self.parse_data(data)
|
|
self.out.write(']>')
|