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module Banzai
module Filter
# HTML filter that replaces user or group references with links.
#
# A special `@all` reference is also supported.
class UserReferenceFilter < ReferenceFilter
# Public: Find `@user` user references in text
#
# UserReferenceFilter.references_in(text) do |match, username|
# "<a href=...>@#{user}</a>"
# end
#
# text - String text to search.
#
# Yields the String match, and the String user name.
#
# Returns a String replaced with the return of the block.
def self.references_in(text)
text.gsub(User.reference_pattern) do |match|
yield match, $~[:user]
end
end
def self.referenced_by(node)
if node.has_attribute?('data-group')
group = Group.find(node.attr('data-group')) rescue nil
return unless group
{ user: group.users }
elsif node.has_attribute?('data-user')
{ user: LazyReference.new(User, node.attr('data-user')) }
elsif node.has_attribute?('data-project')
project = Project.find(node.attr('data-project')) rescue nil
return unless project
{ user: project.team.members.flatten }
end
end
def self.user_can_see_reference?(user, node, context)
if node.has_attribute?('data-group')
group = Group.find(node.attr('data-group')) rescue nil
Ability.abilities.allowed?(user, :read_group, group)
else
super
end
end
def self.user_can_reference?(user, node, context)
# Only team members can reference `@all`
if node.has_attribute?('data-project')
project = Project.find(node.attr('data-project')) rescue nil
return false unless project
user && project.team.member?(user)
else
super
end
end
def call
return doc if project.nil?
ref_pattern = User.reference_pattern
ref_pattern_start = /\A#{ref_pattern}\z/
each_node do |node|
if text_node?(node)
replace_text_when_pattern_matches(node, ref_pattern) do |content|
user_link_filter(content)
end
elsif element_node?(node)
yield_valid_link(node) do |link, text|
if link =~ ref_pattern_start
replace_link_node_with_href(node, link) do
user_link_filter(link, link_text: text)
end
end
end
end
end
doc
end
# Replace `@user` user references in text with links to the referenced
# user's profile page.
#
# text - String text to replace references in.
#
# Returns a String with `@user` references replaced with links. All links
# have `gfm` and `gfm-project_member` class names attached for styling.
def user_link_filter(text, link_text: nil)
self.class.references_in(text) do |match, username|
if username == 'all'
link_to_all(link_text: link_text)
elsif namespace = Namespace.find_by(path: username)
link_to_namespace(namespace, link_text: link_text) || match
else
match
end
end
end
private
def urls
Gitlab::Routing.url_helpers
end
def link_class
reference_class(:project_member)
end
def link_to_all(link_text: nil)
project = context[:project]
url = urls.namespace_project_url(project.namespace, project,
only_path: context[:only_path])
data = data_attribute(project: project.id)
text = link_text || User.reference_prefix + 'all'
link_tag(url, data, text)
end
def link_to_namespace(namespace, link_text: nil)
if namespace.is_a?(Group)
link_to_group(namespace.path, namespace, link_text: link_text)
else
link_to_user(namespace.path, namespace, link_text: link_text)
end
end
def link_to_group(group, namespace, link_text: nil)
url = urls.group_url(group, only_path: context[:only_path])
data = data_attribute(group: namespace.id)
text = link_text || Group.reference_prefix + group
link_tag(url, data, text)
end
def link_to_user(user, namespace, link_text: nil)
url = urls.user_url(user, only_path: context[:only_path])
data = data_attribute(user: namespace.owner_id)
text = link_text || User.reference_prefix + user
link_tag(url, data, text)
end
def link_tag(url, data, text)
%(<a href="#{url}" #{data} class="#{link_class}">#{escape_once(text)}</a>)
end
end
end
end
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