======
Bleach
======

.. image:: https://github.com/mozilla/bleach/workflows/Test/badge.svg
   :target: https://github.com/mozilla/bleach/actions?query=workflow%3ATest

.. image:: https://github.com/mozilla/bleach/workflows/Lint/badge.svg
   :target: https://github.com/mozilla/bleach/actions?query=workflow%3ALint

.. image:: https://badge.fury.io/py/bleach.svg
   :target: http://badge.fury.io/py/bleach

Bleach is an allowed-list-based HTML sanitizing library that escapes or strips
markup and attributes.

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.

Bleach is intended for sanitizing text from *untrusted* sources. If you find
yourself jumping through hoops to allow your site administrators to do lots of
things, you're probably outside the use cases. Either trust those users, or
don't.

Because it relies on html5lib_, Bleach is as good as modern browsers at dealing
with weird, quirky HTML fragments. And *any* of Bleach's methods will fix
unbalanced or mis-nested tags.

The version on GitHub_ is the most up-to-date and contains the latest bug
fixes. You can find full documentation on `ReadTheDocs`_.

:Code:           https://github.com/mozilla/bleach
:Documentation:  https://bleach.readthedocs.io/
:Issue tracker:  https://github.com/mozilla/bleach/issues
:License:        Apache License v2; see LICENSE file


Reporting Bugs
==============

For regular bugs, please report them `in our issue tracker
<https://github.com/mozilla/bleach/issues>`_.

If you believe that you've found a security vulnerability, please `file a secure
bug report in our bug tracker
<https://bugzilla.mozilla.org/enter_bug.cgi?assigned_to=nobody%40mozilla.org&product=Webtools&component=Bleach-security&groups=webtools-security>`_
or send an email to *security AT mozilla DOT org*.

For more information on security-related bug disclosure and the PGP key to use
for sending encrypted mail or to verify responses received from that address,
please read our wiki page at
`<https://www.mozilla.org/en-US/security/#For_Developers>`_.


Security
========

Bleach is a security-focused library.

We have a responsible security vulnerability reporting process. Please use
that if you're reporting a security issue.

Security issues are fixed in private. After we land such a fix, we'll do a
release.

For every release, we mark security issues we've fixed in the ``CHANGES`` in
the **Security issues** section. We include any relevant CVE links.


Installing Bleach
=================

Bleach is available on PyPI_, so you can install it with ``pip``::

    $ pip install bleach


Upgrading Bleach
================

.. warning::

   Before doing any upgrades, read through `Bleach Changes
   <https://bleach.readthedocs.io/en/latest/changes.html>`_ for backwards
   incompatible changes, newer versions, etc.

   Bleach follows `semver 2`_ versioning. Vendored libraries will not
   be changed in patch releases.


Basic use
=========

The simplest way to use Bleach is:

.. code-block:: python

    >>> import bleach

    >>> bleach.clean('an <script>evil()</script> example')
    u'an &lt;script&gt;evil()&lt;/script&gt; example'

    >>> bleach.linkify('an http://example.com url')
    u'an <a href="http://example.com" rel="nofollow">http://example.com</a> url'


Code of Conduct
===============

This project and repository is governed by Mozilla's code of conduct and
etiquette guidelines. For more details please see the `CODE_OF_CONDUCT.md
</CODE_OF_CONDUCT.md>`_


.. _html5lib: https://github.com/html5lib/html5lib-python
.. _GitHub: https://github.com/mozilla/bleach
.. _ReadTheDocs: https://bleach.readthedocs.io/
.. _PyPI: https://pypi.org/project/bleach/
.. _semver 2: https://semver.org/