Bleach
Bleach is an HTML sanitizing library that escapes or strips markup and
attributes based on a white list. Bleach can also linkify text safely, applying
filters that Django's urlize filter cannot, and optionally setting rel
attributes, even on links already in the text.
The version on github is the most up-to-date and contains the latest bug fixes.
Basic Use
The simplest way to use Bleach is:
>>> import bleach
>>> bleach.clean('an <script>evil()</script> example')
'an <script>evil()</script> example'
>>> bleach.linkify('an http://example.com url')
'an <a href="http://example.com" rel="nofollow">http://example.com</a> url
Customizing Bleach
Both clean() and linkify() can take several optional keyword arguments
to customize their behavior.
clean()
tags |
A whitelist of HTML tags. Must be a list. Defaults to
bleach.ALLOWED_TAGS. |
attributes |
A whitelist of HTML attributes. Either a list, in
which case all attributes are allowed on all elements,
or a dict, with tag names as keys and lists of allowed
attributes as values. Or it is possible to pass a
callable instead of a list that accepts name and value
of attribute and returns True of False. Defaults to
bleach.ALLOWED_ATTRIBUTES. |
styles |
A whitelist of allowed CSS properties within a
style attribute. (Note that style attributes
are not allowed by default.) Must be a list. Defaults
to []. |
strip |
Strip disallowed HTML instead of escaping it. A
boolean. Defaults to False. |
strip_comments |
Strip HTML comments. A boolean. Defaults to True. |
linkify()
nofollow |
Add rel="nofollow" to non-relative links (both
created by linkify() and those already present
in the text). Defaults to True. |
filter_url |
A callable through which the href attribute of
links (both created by linkify() and already
present in the text) will be passed. Must accept a
single argument and return a string. |
filter_text |
A callable through which the text of links (only
those created by linkify) will be passed. Must
accept a single argument and return a string. |
skip_pre |
Do not create new links inside <pre> sections.
Still follows nofollow. |
parse_email |
Linkify email addresses with mailto:. Defaults
False. |