settings.py

import bleach
from django.conf import settings as django_settings
from django.urls import reverse_lazy

# Should urls be case sensitive?
URL_CASE_SENSITIVE = getattr(django_settings, 'WIKI_URL_CASE_SENSITIVE', False)

# Non-configurable (at the moment)
WIKI_LANGUAGE = 'markdown'

# The editor class to use -- maybe a 3rd party or your own...? You can always
# extend the built-in editor and customize it....
EDITOR = getattr(django_settings, 'WIKI_EDITOR', 'wiki.editors.markitup.MarkItUp')

MARKDOWN_EXTENSIONS = getattr(django_settings, 'WIKI_MARKDOWN_EXTENSIONS', ['extra', 'toc'])

########################
## HTML sanitization code copied from the upstream repo
########################

#: Whether to use Bleach or not. It's not recommended to turn this off unless
#: you know what you're doing and you don't want to use the other options.
MARKDOWN_SANITIZE_HTML = getattr(django_settings, "WIKI_MARKDOWN_SANITIZE_HTML", True)

_default_tag_whitelists = (
    bleach.ALLOWED_TAGS
    + [
        "figure",
        "figcaption",
        "br",
        "hr",
        "p",
        "div",
        "img",
        "pre",
        "span",
        "sup",
        "table",
        "thead",
        "tbody",
        "th",
        "tr",
        "td",
        "dl",
        "dt",
        "dd",
    ]
    + ["h{}".format(n) for n in range(1, 7)]
)


#: List of allowed tags in Markdown article contents.
MARKDOWN_HTML_WHITELIST = _default_tag_whitelists
MARKDOWN_HTML_WHITELIST += getattr(django_settings, "WIKI_MARKDOWN_HTML_WHITELIST", [])

_default_attribute_whitelist = bleach.ALLOWED_ATTRIBUTES
for tag in MARKDOWN_HTML_WHITELIST:
    if tag not in _default_attribute_whitelist:
        _default_attribute_whitelist[tag] = []
    _default_attribute_whitelist[tag].append("class")
    _default_attribute_whitelist[tag].append("id")
    _default_attribute_whitelist[tag].append("target")
    _default_attribute_whitelist[tag].append("rel")

_default_attribute_whitelist["img"].append("src")
_default_attribute_whitelist["img"].append("alt")

#: Dictionary of allowed attributes in Markdown article contents.
MARKDOWN_HTML_ATTRIBUTES = _default_attribute_whitelist
MARKDOWN_HTML_ATTRIBUTES.update(
    getattr(django_settings, "WIKI_MARKDOWN_HTML_ATTRIBUTES", {})
)

#: Allowed inline styles in Markdown article contents, default is no styles
#: (empty list).
MARKDOWN_HTML_STYLES = getattr(django_settings, "WIKI_MARKDOWN_HTML_STYLES", [])

_project_defined_attrs = getattr(
    django_settings, "WIKI_MARKDOWN_HTML_ATTRIBUTE_WHITELIST", False
)

# If styles are allowed but no custom attributes are defined, we allow styles
# for all kinds of tags.
if MARKDOWN_HTML_STYLES and not _project_defined_attrs:
    MARKDOWN_HTML_ATTRIBUTES["*"] = "style"


# This slug is used in URLPath if an article has been deleted. The children of the
# URLPath of that article are moved to lost and found. They keep their permissions
# and all their content.
LOST_AND_FOUND_SLUG = getattr(django_settings, 'WIKI_LOST_AND_FOUND_SLUG', 'lost-and-found')

# Do we want to log IPs?
LOG_IPS_ANONYMOUS = getattr(django_settings, 'WIKI_LOG_IPS_ANONYMOUS', True)
LOG_IPS_USERS = getattr(django_settings, 'WIKI_LOG_IPS_USERS', False)

####################################
# PERMISSIONS AND ACCOUNT HANDLING #
####################################

# NB! None of these callables need to handle anonymous users as they are treated
# in separate settings...

# A function returning True/False if a user has permission to assign
# permissions on an article
# Relevance: changing owner and group membership
CAN_ASSIGN = getattr(django_settings, 'WIKI_CAN_ASSIGN', lambda article, user: user.has_perm('wiki.assign'))

# A function returning True/False if the owner of an article has permission to change
# the group to a user's own groups
# Relevance: changing group membership
CAN_ASSIGN_OWNER = getattr(django_settings, 'WIKI_ASSIGN_OWNER', lambda article, user: False)

# A function returning True/False if a user has permission to change
# read/write access for groups and others
CAN_CHANGE_PERMISSIONS = getattr(django_settings, 'WIKI_CAN_CHANGE_PERMISSIONS', lambda article, user: article.owner == user or user.has_perm('wiki.assign'))

# Specifies if a user has access to soft deletion of articles
CAN_DELETE = getattr(django_settings, 'WIKI_CAN_DELETE', lambda article, user: article.can_write(user=user))

# A function returning True/False if a user has permission to change
# moderate, ie. lock articles and permanently delete content.
CAN_MODERATE = getattr(django_settings, 'WIKI_CAN_MODERATE', lambda article, user: user.has_perm('wiki.moderate'))

# A function returning True/False if a user has permission to create
# new groups and users for the wiki.
CAN_ADMIN = getattr(django_settings, 'WIKI_CAN_ADMIN', lambda article, user: user.has_perm('wiki.admin'))

# Treat anonymous (non logged in) users as the "other" user group
ANONYMOUS = getattr(django_settings, 'WIKI_ANONYMOUS', True)

# Globally enable write access for anonymous users, if true anonymous users will be treated
# as the others_write boolean field on models.Article. 
ANONYMOUS_WRITE = getattr(django_settings, 'WIKI_ANONYMOUS_WRITE', False)

# Sign up, login and logout views should be accessible 
ACCOUNT_HANDLING = getattr(django_settings, 'WIKI_ACCOUNT_HANDLING', True)

if ACCOUNT_HANDLING:
    LOGIN_URL = reverse_lazy("wiki:login")
else:
    LOGIN_URL = getattr(django_settings, "LOGIN_URL", "/")


##################
# OTHER SETTINGS #
##################

# Maximum amount of children to display in a menu before going "+more"
# NEVER set this to 0 as it will wrongly inform the user that there are no
# children and for instance that an article can be safely deleted.
SHOW_MAX_CHILDREN = getattr(django_settings, 'WIKI_SHOW_MAX_CHILDREN', 20)

USE_BOOTSTRAP_SELECT_WIDGET = getattr(django_settings, 'WIKI_USE_BOOTSTRAP_SELECT_WIDGET', True)

LINK_LIVE_LOOKUPS = getattr(django_settings, 'WIKI_LINK_LIVE_LOOKUPS', True)
LINK_DEFAULT_LEVEL = getattr(django_settings, 'WIKI_LINK_DEFAULT_LEVEL', 1)

####################
# PLANNED SETTINGS #
####################

# Maximum revisions to keep for an article, 0=unlimited
MAX_REVISIONS = getattr(django_settings, 'WIKI_MAX_REVISIONS', 100)

# Maximum age of revisions in days, 0=unlimited
MAX_REVISION_AGE = getattr(django_settings, 'MAX_REVISION_AGE', 365)

# Maximum allowed revisions per minute for any given user or IP
REVISIONS_PER_MINUTE = getattr(django_settings, 'WIKI_REVISIONS_PER_MINUTE', 3)