PyBitmessage-2021-04-27/src/bitmessageqt/safehtmlparser.py

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from HTMLParser import HTMLParser
import inspect
from urllib import quote, quote_plus
class SafeHTMLParser(HTMLParser):
# from html5lib.sanitiser
acceptable_elements = ['a', 'abbr', 'acronym', 'address', 'area',
'article', 'aside', 'audio', 'b', 'big', 'blockquote', 'br', 'button',
'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup',
'command', 'datagrid', 'datalist', 'dd', 'del', 'details', 'dfn',
'dialog', 'dir', 'div', 'dl', 'dt', 'em', 'event-source', 'fieldset',
'figcaption', 'figure', 'footer', 'font', 'header', 'h1',
'h2', 'h3', 'h4', 'h5', 'h6', 'hr', 'i', 'img', 'ins',
'keygen', 'kbd', 'label', 'legend', 'li', 'm', 'map', 'menu', 'meter',
'multicol', 'nav', 'nextid', 'ol', 'output', 'optgroup', 'option',
'p', 'pre', 'progress', 'q', 's', 'samp', 'section', 'select',
'small', 'sound', 'source', 'spacer', 'span', 'strike', 'strong',
'sub', 'sup', 'table', 'tbody', 'td', 'textarea', 'time', 'tfoot',
'th', 'thead', 'tr', 'tt', 'u', 'ul', 'var', 'video']
def __init__(self, *args, **kwargs):
HTMLParser.__init__(self, *args, **kwargs)
self.elements = set()
self.sanitised = u""
self.raw = u""
self.has_html = False
def reset_safe(self):
self.elements = set()
self.raw = u""
self.sanitised = u""
self.has_html = False
def add_if_acceptable(self, tag, attrs = None):
if not tag in self.acceptable_elements:
return
self.sanitised += "<"
if inspect.stack()[1][3] == "handle_endtag":
self.sanitised += "/"
self.sanitised += tag
if not attrs is None:
for attr in attrs:
if tag == "img" and attr[0] == "src" and not self.allow_picture:
attr[1] = ""
self.sanitised += " " + quote_plus(attr[0])
if not (attr[1] is None):
self.sanitised += "=\"" + attr[1] + "\""
if inspect.stack()[1][3] == "handle_startendtag":
self.sanitised += "/"
self.sanitised += ">"
def add_raw(self, tag, attrs = None):
self.raw += "&lt;"
if inspect.stack()[1][3] == "handle_endtag":
self.raw += "/"
self.raw += tag
if not attrs is None:
for attr in attrs:
if tag == "img" and attr[0] == "src" and not self.allow_picture:
attr[1] = ""
self.raw += " " + attr[0]
if not (attr[1] is None):
self.raw += "=&quot;" + attr[1] + "&quot;"
if inspect.stack()[1][3] == "handle_startendtag":
self.raw += "/"
self.raw += "&gt;"
def handle_starttag(self, tag, attrs):
if tag in self.acceptable_elements:
self.has_html = True
self.add_if_acceptable(tag, attrs)
self.add_raw(tag, attrs)
def handle_endtag(self, tag):
self.add_if_acceptable(tag)
self.add_raw(tag)
def handle_startendtag(self, tag, attrs):
if tag in self.acceptable_elements:
self.has_html = True
self.add_if_acceptable(tag, attrs)
self.add_raw(tag, attrs)
def handle_data(self, data):
self.sanitised += unicode(data, 'utf-8', 'replace')
tmp = data.replace("\n", "<br/>")
self.raw += unicode(tmp, 'utf-8', 'replace')
def handle_charref(self, name):
self.sanitised += "&#" + name + ";"
self.raw += quote("&#" + name + ";")
def handle_entityref(self, name):
self.sanitised += "&" + name + ";"
self.raw += quote("&" + name + ";")
def is_html(self, text = None, allow_picture = False):
if text:
self.reset()
self.reset_safe()
self.feed(text)
self.close()
self.allow_picture = allow_picture
return self.has_html