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require 'html/pipeline'
module Gitlab
module Markdown
# HTML filter that replaces user or group references with links. References
# within <pre>, <code>, <a>, and <style> elements are ignored.
#
# A special `@all` reference is also supported.
#
# Context options:
# :project (required) - Current project.
# :reference_class - Custom CSS class added to reference links.
# :only_path - Generate path-only links.
#
class UserReferenceFilter < HTML::Pipeline::Filter
# 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_PATTERN) do |match|
yield match, $~[:user]
end
end
# Pattern used to extract `@user` user references from text
USER_PATTERN = /@(?<user>#{Gitlab::Regex::NAMESPACE_REGEX_STR})/
# Don't look for references in text nodes that are children of these
# elements.
IGNORE_PARENTS = %w(pre code a style).to_set
def call
doc.search('text()').each do |node|
content = node.to_html
next if project.nil?
next unless content.match(USER_PATTERN)
next if has_ancestor?(node, IGNORE_PARENTS)
html = user_link_filter(content)
next if html == content
node.replace(html)
end
doc
end
def validate
needs :project
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)
project = context[:project]
self.class.references_in(text) do |match, user|
klass = "gfm gfm-project_member #{context[:reference_class]}".strip
if user == 'all'
url = link_to_all(project)
%(<a href="#{url}" class="#{klass}">@#{user}</a>)
elsif namespace = Namespace.find_by(path: user)
if namespace.is_a?(Group)
url = group_url(user, only_path: context[:only_path])
else
url = user_url(user, only_path: context[:only_path])
end
%(<a href="#{url}" class="#{klass}">@#{user}</a>)
else
match
end
end
end
def project
context[:project]
end
# TODO (rspeicher): Cleanup
def group_url(*args)
h = Rails.application.routes.url_helpers
h.group_url(*args)
end
# TODO (rspeicher): Cleanup
def user_url(*args)
h = Rails.application.routes.url_helpers
h.user_url(*args)
end
# TODO (rspeicher): Cleanup
def link_to_all(project)
h = Rails.application.routes.url_helpers
h.namespace_project_url(project.namespace, project,
only_path: context[:only_path])
end
end
end
end
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