381 lines
14 KiB
Ruby
381 lines
14 KiB
Ruby
# frozen_string_literal: true
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module Kramdown
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module Parser
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# Parses an Atlassian Document Format (ADF) json into a
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# Kramdown AST tree, for conversion to another format.
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# The primary goal is to convert in GitLab Markdown.
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#
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# This parser does NOT resolve external resources, such as media/attachments.
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# A special url is generated for media based on the id, for example
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# 
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# so that a later filter/process can resolve those.
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#
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# @see https://developer.atlassian.com/cloud/jira/platform/apis/document/structure/ ADF Document Structure
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# @see https://developer.atlassian.com/cloud/jira/platform/apis/document/playground/ ADF Playground
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# @see https://developer.atlassian.com/cloud/jira/platform/apis/document/viewer/ ADF Viewer
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class AtlassianDocumentFormat < Kramdown::Parser::Base
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unless defined?(TOP_LEVEL_BLOCK_NODES)
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TOP_LEVEL_BLOCK_NODES = %w[blockquote
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bulletList
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codeBlock
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heading
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mediaGroup
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mediaSingle
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orderedList
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panel
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paragraph
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rule
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table].freeze
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CHILD_BLOCK_NODES = %w[listItem
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media
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table_cell
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table_header
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table_row].freeze
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INLINE_NODES = %w[emoji
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hardBreak
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inlineCard
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mention
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text].freeze
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MARKS = %w[code
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em
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link
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strike
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strong
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subsup
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textColor
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underline].freeze
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TABLE_CELL_NODES = %w[blockquote
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bulletList
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codeBlock
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heading
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mediaGroup
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orderedList
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panel
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paragraph
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rule].freeze
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LIST_ITEM_NODES = %w[bulletList
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codeBlock
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mediaSingle
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orderedList
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paragraph].freeze
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PANEL_NODES = %w[bulletList
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heading
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orderedList
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paragraph].freeze
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PANEL_EMOJIS = { info: ':information_source:',
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note: ':notepad_spiral:',
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warning: ':warning:',
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success: ':white_check_mark:',
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error: ':octagonal_sign:' }.freeze
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# The default language for code blocks is `java`, as indicated in
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# You can't change the default in Jira. There was a comment that indicated
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# Confluence can set the default language.
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# @see https://jira.atlassian.com/secure/WikiRendererHelpAction.jspa?section=advanced&_ga=2.5135221.773220073.1591894917-438867908.1591894917
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# @see https://jira.atlassian.com/browse/JRASERVER-29184?focusedCommentId=832255&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-832255
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CODE_BLOCK_DEFAULT_LANGUAGE = 'java'
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end
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def parse
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ast = Gitlab::Json.parse(@source)
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validate_document(ast)
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process_content(@root, ast, TOP_LEVEL_BLOCK_NODES)
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rescue ::JSON::ParserError => e
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msg = 'Invalid Atlassian Document Format JSON'
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Gitlab::AppLogger.error msg
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Gitlab::AppLogger.error e
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raise ::Kramdown::Error, msg
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end
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def process_content(element, ast_node, allowed_types)
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ast_node['content'].each do |node|
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next unless allowed_types.include?(node['type'])
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public_send("process_#{node['type'].underscore}", element, node) # rubocop:disable GitlabSecurity/PublicSend
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end
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end
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def process_blockquote(element, ast_node)
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new_element = Element.new(:blockquote)
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element.children << new_element
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process_content(new_element, ast_node, TOP_LEVEL_BLOCK_NODES)
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end
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def process_bullet_list(element, ast_node)
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new_element = Element.new(:ul)
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element.children << new_element
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process_content(new_element, ast_node, %w[listItem])
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end
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def process_code_block(element, ast_node)
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code_text = gather_text(ast_node)
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lang = ast_node.dig('attrs', 'language') || CODE_BLOCK_DEFAULT_LANGUAGE
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element.children << Element.new(:codeblock, code_text, {}, { lang: lang })
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end
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def process_emoji(element, ast_node)
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emoji = ast_node.dig('attrs', 'text') || ast_node.dig('attrs', 'shortName')
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return unless emoji
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add_text(emoji, element, :text)
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end
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def process_hard_break(element, ast_node)
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element.children << Element.new(:br)
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end
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def process_heading(element, ast_node)
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level = ast_node.dig('attrs', 'level').to_i.clamp(1, 6)
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options = { level: level }
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new_element = Element.new(:header, nil, nil, options)
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element.children << new_element
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process_content(new_element, ast_node, INLINE_NODES)
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extract_element_text(new_element, new_element.options[:raw_text] = +'')
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end
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def process_inline_card(element, ast_node)
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url = ast_node.dig('attrs', 'url')
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data = ast_node.dig('attrs', 'data')
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if url
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# we don't pull a description from the link and create a panel,
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# just convert to a normal link
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new_element = Element.new(:text, url)
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element.children << wrap_element(new_element, :a, nil, { 'href' => url })
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elsif data
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# data is JSONLD (https://json-ld.org/), so for now output
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# as a codespan of text, with `adf-inlineCard: ` at the start
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text = "adf-inlineCard: #{data}"
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element.children << Element.new(:codespan, text, nil, { lang: 'adf-inlinecard' })
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end
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end
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def process_list_item(element, ast_node)
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new_element = Element.new(:li)
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element.children << new_element
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process_content(new_element, ast_node, LIST_ITEM_NODES)
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end
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def process_media(element, ast_node)
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media_url = "adf-media://#{ast_node['attrs']['id']}"
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case ast_node['attrs']['type']
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when 'file'
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attrs = { 'src' => media_url, 'alt' => ast_node['attrs']['collection'] }
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media_element = Element.new(:img, nil, attrs)
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when 'link'
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attrs = { 'href' => media_url }
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media_element = wrap_element(Element.new(:text, media_url), :a, nil, attrs)
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end
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media_element = wrap_element(media_element, :p)
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element.children << media_element
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end
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# wraps a single media element.
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# Currently ignore attrs.layout and attrs.width
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def process_media_single(element, ast_node)
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new_element = Element.new(:p)
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element.children << new_element
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process_content(new_element, ast_node, %w[media])
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end
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# wraps a group media element.
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# Currently ignore attrs.layout and attrs.width
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def process_media_group(element, ast_node)
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ul_element = Element.new(:ul)
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element.children << ul_element
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ast_node['content'].each do |node|
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next unless node['type'] == 'media'
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li_element = Element.new(:li)
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ul_element.children << li_element
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process_media(li_element, node)
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end
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end
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def process_mention(element, ast_node)
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# Make it `@adf-mention:` since there is no guarantee that it is
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# a valid username in our system. This gives us an
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# opportunity to replace it later. Mention name can have
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# spaces, so double quote it
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mention_text = ast_node.dig('attrs', 'text')&.gsub('@', '')
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mention_text = %Q("#{mention_text}") if mention_text.match?(/ /)
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mention_text = %Q(@adf-mention:#{mention_text})
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add_text(mention_text, element, :text)
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end
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def process_ordered_list(element, ast_node)
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# `attrs.order` is not supported in the Kramdown AST
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new_element = Element.new(:ol)
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element.children << new_element
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process_content(new_element, ast_node, %w[listItem])
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end
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# since we don't have something similar, then put <hr> around it and
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# add a bolded status text (eg: "Error:") to the front of it.
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def process_panel(element, ast_node)
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panel_type = ast_node.dig('attrs', 'panelType')
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return unless %w[info note warning success error].include?(panel_type)
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panel_header_text = "#{PANEL_EMOJIS[panel_type.to_sym]} "
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panel_header_element = Element.new(:text, panel_header_text)
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new_element = Element.new(:blockquote)
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new_element.children << panel_header_element
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element.children << new_element
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process_content(new_element, ast_node, PANEL_NODES)
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end
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def process_paragraph(element, ast_node)
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new_element = Element.new(:p)
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element.children << new_element
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process_content(new_element, ast_node, INLINE_NODES)
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end
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def process_rule(element, ast_node)
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element.children << Element.new(:hr)
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end
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def process_table(element, ast_node)
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table = Element.new(:table, nil, nil, { alignment: [:default, :default] })
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element.children << table
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tbody = Element.new(:tbody)
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table.children << tbody
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process_content(tbody, ast_node, %w[tableRow])
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end
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# we ignore the attributes, attrs.background, attrs.colspan,
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# attrs.colwidth, and attrs.rowspan
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def process_table_cell(element, ast_node)
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new_element = Element.new(:td)
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element.children << new_element
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process_content(new_element, ast_node, TABLE_CELL_NODES)
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end
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# we ignore the attributes, attrs.background, attrs.colspan,
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# attrs.colwidth, and attrs.rowspan
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def process_table_header(element, ast_node)
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new_element = Element.new(:th)
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element.children << new_element
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process_content(new_element, ast_node, TABLE_CELL_NODES)
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end
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def process_table_row(element, ast_node)
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new_element = Element.new(:tr)
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element.children << new_element
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process_content(new_element, ast_node, %w[tableHeader tableCell])
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end
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def process_text(element, ast_node)
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new_element = Element.new(:text, ast_node['text'])
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new_element = apply_marks(new_element, ast_node, MARKS)
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element.children << new_element
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end
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private
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def validate_document(ast)
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return if ast['type'] == 'doc'
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raise ::JSON::ParserError, 'missing doc node'
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end
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# ADF marks are an attribute on the node. For kramdown,
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# we have to wrap the node with an element for the mark.
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def apply_marks(element, ast_node, allowed_types)
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return element unless ast_node['marks']
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new_element = element
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ast_node['marks'].each do |mark|
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next unless allowed_types.include?(mark['type'])
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case mark['type']
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when 'code'
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new_element = Element.new(:codespan, ast_node['text'])
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when 'em'
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new_element = wrap_element(new_element, :em)
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when 'link'
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attrs = { 'href' => mark.dig('attrs', 'href') }
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attrs['title'] = mark.dig('attrs', 'title')
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new_element = wrap_element(new_element, :a, nil, attrs)
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when 'strike'
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new_element = wrap_element(new_element, :html_element, 'del', {}, category: :span)
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when 'strong'
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new_element = wrap_element(new_element, :strong)
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when 'subsup'
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type = mark.dig('attrs', 'type')
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case type
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when 'sub'
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new_element = wrap_element(new_element, :html_element, 'sub', {}, category: :span)
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when 'sup'
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new_element = wrap_element(new_element, :html_element, 'sup', {}, category: :span)
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else
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next
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end
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when 'textColor'
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color = mark.dig('attrs', 'color')
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new_element = wrap_element(new_element, :html_element, 'span', { color: color }, category: :span)
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when 'underline'
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new_element = wrap_element(new_element, :html_element, 'u', {}, category: :span)
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else
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next
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end
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end
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new_element
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end
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def wrap_element(element, type, *args)
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wrapper = Element.new(type, *args)
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wrapper.children << element
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wrapper
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end
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def extract_element_text(element, raw)
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raw << element.value.to_s if element.type == :text
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element.children.each { |c| extract_element_text(c, raw) }
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end
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def gather_text(ast_node)
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ast_node['content'].inject('') do |memo, node|
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node['type'] == 'text' ? (memo + node['text']) : memo
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end
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end
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def method_missing(method, *args)
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raise NotImplementedError, "method `#{method}` not implemented yet"
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end
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end
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end
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end
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