# frozen_string_literal: true
require 'nokogiri'
module MarkupHelper
include ActionView::Helpers::TextHelper
include ActionView::Context
# Let's increase the render timeout
# For a smaller one, a test that renders the blob content statically fails
# We can consider removing this custom timeout when refactor_blob_viewer FF is removed:
# https://gitlab.com/gitlab-org/gitlab/-/issues/324351
RENDER_TIMEOUT = 5.seconds
def plain?(filename)
Gitlab::MarkupHelper.plain?(filename)
end
def markup?(filename)
Gitlab::MarkupHelper.markup?(filename)
end
def gitlab_markdown?(filename)
Gitlab::MarkupHelper.gitlab_markdown?(filename)
end
def asciidoc?(filename)
Gitlab::MarkupHelper.asciidoc?(filename)
end
# Use this in places where you would normally use link_to(gfm(...), ...).
def link_to_markdown(body, url, html_options = {})
return '' if body.blank?
link_to_html(markdown(body, pipeline: :single_line), url, html_options)
end
def link_to_markdown_field(object, field, url, html_options = {})
rendered_field = markdown_field(object, field)
link_to_html(rendered_field, url, html_options)
end
# It solves a problem occurring with nested links (i.e.
# "outer text gfm ref more outer text"). This will not be
# interpreted as intended. Browsers will parse something like
# "outer text gfm ref more outer text" (notice the last part is
# not linked any more). link_to_html corrects that. It wraps all parts to
# explicitly produce the correct linking behavior (i.e.
# "outer text gfm ref more outer text").
def link_to_html(redacted, url, html_options = {})
fragment = Nokogiri::HTML::DocumentFragment.parse(redacted)
if fragment.children.size == 1 && fragment.children[0].name == 'a'
# Fragment has only one node, and it's a link generated by `gfm`.
# Replace it with our requested link.
text = fragment.children[0].text
fragment.children[0].replace(link_to(text, url, html_options))
else
# Traverse the fragment's first generation of children looking for
# either pure text or emojis, wrapping anything found in the
# requested link
fragment.children.each do |node|
if node.text?
node.replace(link_to(node.text, url, html_options))
elsif node.name == 'gl-emoji'
node.replace(link_to(node.to_html.html_safe, url, html_options))
end
end
end
# Add any custom CSS classes to the GFM-generated reference links
if html_options[:class]
fragment.css('a.gfm').add_class(html_options[:class])
end
fragment.to_html.html_safe
end
# Return the first line of +text+, up to +max_chars+, after parsing the line
# as Markdown. HTML tags in the parsed output are not counted toward the
# +max_chars+ limit. If the length limit falls within a tag's contents, then
# the tag contents are truncated without removing the closing tag.
def first_line_in_markdown(object, attribute, max_chars = nil, options = {})
md = markdown_field(object, attribute, options.merge(post_process: false))
return unless md.present?
tags = %w(a gl-emoji b strong i em pre code p span)
tags << 'img' if options[:allow_images]
text = truncate_visible(md, max_chars || md.length)
text = prepare_for_rendering(text, markdown_field_render_context(object, attribute, options))
text = sanitize(
text,
tags: tags,
attributes: Rails::Html::WhiteListSanitizer.allowed_attributes +
%w(
style data-src data-name data-unicode-version data-html
data-reference-type data-project-path data-iid data-mr-title
)
)
# since
tags are stripped, this can leave empty tags hanging around
# (as our markdown wraps images in links)
options[:allow_images] ? text : strip_empty_link_tags(text).html_safe
end
def markdown(text, context = {})
return '' unless text.present?
context[:project] ||= @project
context[:group] ||= @group
html = markdown_unsafe(text, context)
prepare_for_rendering(html, context)
end
def markdown_field(object, field, context = {})
object = object.for_display if object.respond_to?(:for_display)
return '' unless object.present?
redacted_field_html = object.try(:"redacted_#{field}_html")
return redacted_field_html if redacted_field_html
render_markdown_field(object, field, context)
end
def markup(file_name, text, context = {})
context[:project] ||= @project
context[:text_source] ||= :blob
html = context.delete(:rendered) || markup_unsafe(file_name, text, context)
prepare_for_rendering(html, context)
end
def render_wiki_content(wiki_page, context = {})
text = wiki_page.content
return '' unless text.present?
context = render_wiki_content_context(wiki_page.wiki, wiki_page, context)
html = markup_unsafe(wiki_page.path, text, context)
prepare_for_rendering(html, context)
end
def markup_unsafe(file_name, text, context = {})
return '' unless text.present?
markup = proc do
if gitlab_markdown?(file_name)
markdown_unsafe(text, context)
elsif asciidoc?(file_name)
asciidoc_unsafe(text, context)
elsif plain?(file_name)
plain_unsafe(text)
else
other_markup_unsafe(file_name, text, context)
end
end
if Feature.enabled?(:markup_rendering_timeout, @project)
Gitlab::RenderTimeout.timeout(foreground: RENDER_TIMEOUT, &markup)
else
markup.call
end
rescue StandardError => e
Gitlab::ErrorTracking.track_exception(e, project_id: @project&.id, file_name: file_name)
simple_format(text)
end
# Returns the text necessary to reference `entity` across projects
#
# project - Project to reference
# entity - Object that responds to `to_reference`
#
# Examples:
#
# cross_project_reference(project, project.issues.first)
# # => 'namespace1/project1#123'
#
# cross_project_reference(project, project.merge_requests.first)
# # => 'namespace1/project1!345'
#
# Returns a String
def cross_project_reference(project, entity)
if entity.respond_to?(:to_reference)
entity.to_reference(project, full: true)
else
''
end
end
private
def render_wiki_content_context(wiki, wiki_page, context)
context.merge(
pipeline: :wiki,
wiki: wiki,
repository: wiki.repository,
page_slug: wiki_page.slug,
issuable_reference_expansion_enabled: true,
requested_path: wiki_page.path
).merge(render_wiki_content_context_container(wiki))
end
def render_wiki_content_context_container(wiki)
{ project: wiki.container }
end
# Return +text+, truncated to +max_chars+ characters, excluding any HTML
# tags.
def truncate_visible(text, max_chars)
doc = Nokogiri::HTML.fragment(text)
content_length = 0
truncated = false
doc.traverse do |node|
if node.text? || node.content.empty?
if truncated
node.remove
next
end
# Handle line breaks within a node
if node.content.strip.lines.length > 1
node.content = "#{node.content.lines.first.chomp}..."
truncated = true
end
num_remaining = max_chars - content_length
if node.content.length > num_remaining
node.content = node.content.truncate(num_remaining)
truncated = true
end
content_length += node.content.length
end
truncated = truncate_if_block(node, truncated)
end
doc.to_html
end
# Used by #truncate_visible. If +node+ is the first block element, and the
# text hasn't already been truncated, then append "..." to the node contents
# and return true. Otherwise return false.
def truncate_if_block(node, truncated)
return true if truncated
if node.element? && (node.description&.block? || node.matches?('pre > code > .line'))
node.inner_html = "#{node.inner_html}..." if node.next_sibling
true
else
truncated
end
end
def strip_empty_link_tags(text)
scrubber = Loofah::Scrubber.new do |node|
node.remove if node.name == 'a' && node.children.empty?
end
sanitize text, scrubber: scrubber
end
def markdown_toolbar_button(options = {})
data = options[:data].merge({ container: 'body' })
content_tag :button,
type: 'button',
class: 'gl-button btn btn-default-tertiary btn-icon js-md has-tooltip',
data: data,
title: options[:title],
aria: { label: options[:title] } do
sprite_icon(options[:icon])
end
end
def markdown_unsafe(text, context = {})
Banzai.render(text, context)
end
def asciidoc_unsafe(text, context = {})
context.reverse_merge!(
commit: @commit,
ref: @ref,
requested_path: @path
)
Gitlab::Asciidoc.render(text, context)
end
def plain_unsafe(text)
content_tag :pre, class: 'plain-readme' do
text
end
end
def other_markup_unsafe(file_name, text, context = {})
Gitlab::OtherMarkup.render(file_name, text, context)
end
def render_markdown_field(object, field, context = {})
post_process = context.delete(:post_process)
post_process = true if post_process.nil?
html = Banzai.render_field(object, field, context)
return html unless post_process
prepare_for_rendering(html, markdown_field_render_context(object, field, context))
end
def markdown_field_render_context(object, field, base_context = {})
return base_context unless object.respond_to?(:banzai_render_context)
base_context.reverse_merge(object.banzai_render_context(field))
end
def prepare_for_rendering(html, context = {})
return '' unless html.present?
context.reverse_merge!(
current_user: (current_user if defined?(current_user)),
# RepositoryLinkFilter and UploadLinkFilter
commit: @commit,
wiki: @wiki,
ref: @ref,
requested_path: @path
)
html = Banzai.post_process(html, context)
Hamlit::RailsHelpers.preserve(html)
end
extend self
end
MarkupHelper.prepend_mod_with('MarkupHelper')