224 lines
6.1 KiB
Ruby
224 lines
6.1 KiB
Ruby
# frozen_string_literal: true
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module Gitlab
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module QuickActions
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# This class takes an array of commands that should be extracted from a
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# given text.
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#
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# ```
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# extractor = Gitlab::QuickActions::Extractor.new([:open, :assign, :labels])
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# ```
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class Extractor
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CODE_REGEX = %r{
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(?<code>
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# Code blocks:
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# ```
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# Anything, including `/cmd arg` which are ignored by this filter
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# ```
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^```
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.+?
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\n```$
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)
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}mix.freeze
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INLINE_CODE_REGEX = %r{
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(?<inline_code>
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# Inline code on separate rows:
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# `
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# Anything, including `/cmd arg` which are ignored by this filter
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# `
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`.+?`
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)
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}mix.freeze
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HTML_BLOCK_REGEX = %r{
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(?<html>
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# HTML block:
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# <tag>
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# Anything, including `/cmd arg` which are ignored by this filter
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# </tag>
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^<[^>]+?>\n
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.+?
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\n<\/[^>]+?>$
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)
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}mix.freeze
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QUOTE_BLOCK_REGEX = %r{
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(?<html>
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# Quote block:
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# >>>
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# Anything, including `/cmd arg` which are ignored by this filter
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# >>>
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^>>>
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.+?
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\n>>>$
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)
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}mix.freeze
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EXCLUSION_REGEX = %r{
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#{CODE_REGEX} | #{INLINE_CODE_REGEX} | #{HTML_BLOCK_REGEX} | #{QUOTE_BLOCK_REGEX}
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}mix.freeze
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attr_reader :command_definitions
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def initialize(command_definitions)
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@command_definitions = command_definitions
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@commands_regex = {}
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end
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# Extracts commands from content and return an array of commands.
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# The array looks like the following:
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# [
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# ['command1'],
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# ['command3', 'arg1 arg2'],
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# ]
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# The command and the arguments are stripped.
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# The original command text is removed from the given `content`.
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#
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# Usage:
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# ```
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# extractor = Gitlab::QuickActions::Extractor.new([:open, :assign, :labels])
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# msg = %(hello\n/labels ~foo ~"bar baz"\nworld)
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# commands = extractor.extract_commands(msg) #=> [['labels', '~foo ~"bar baz"']]
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# msg #=> "hello\nworld"
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# ```
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def extract_commands(content, only: nil)
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return [content, []] unless content
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perform_regex(content, only: only)
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end
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# Encloses quick action commands into code span markdown
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# avoiding them being executed, for example, when sent via email
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# to GitLab service desk.
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# Example: /label ~label1 becomes `/label ~label1`
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def redact_commands(content)
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return "" unless content
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content, _ = perform_regex(content, redact: true)
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content
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end
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private
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def perform_regex(content, only: nil, redact: false)
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names = command_names(limit_to_commands: only).map(&:to_s)
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sub_names = substitution_names.map(&:to_s)
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commands = []
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content = content.dup
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content.delete!("\r")
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content.gsub!(commands_regex(names: names, sub_names: sub_names)) do
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command, output = if $~[:substitution]
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process_substitutions($~)
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else
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process_commands($~, redact)
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end
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commands << command
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output
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end
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[content.rstrip, commands.reject(&:empty?)]
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end
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def process_commands(matched_text, redact)
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output = matched_text[0]
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command = []
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if matched_text[:cmd]
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command = [matched_text[:cmd].downcase, matched_text[:arg]].reject(&:blank?)
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output = ''
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if redact
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output = "`/#{matched_text[:cmd]}#{" " + matched_text[:arg] if matched_text[:arg]}`"
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output += "\n" if matched_text[0].include?("\n")
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end
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end
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[command, output]
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end
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def process_substitutions(matched_text)
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output = matched_text[0]
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command = []
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if matched_text[:substitution]
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cmd = matched_text[:substitution].downcase
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command = [cmd, matched_text[:arg]].reject(&:blank?)
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substitution = substitution_definitions.find { |definition| definition.all_names.include?(cmd.to_sym) }
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output = substitution.perform_substitution(self, output) if substitution
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end
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[command, output]
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end
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# Builds a regular expression to match known commands.
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# First match group captures the command name and
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# second match group captures its arguments.
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#
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# It looks something like:
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#
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# /^\/(?<cmd>close|reopen|...)(?:( |$))(?<arg>[^\/\n]*)(?:\n|$)/
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def commands_regex(names:, sub_names:)
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@commands_regex[names] ||= %r{
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#{EXCLUSION_REGEX}
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(?:
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# Command not in a blockquote, blockcode, or HTML tag:
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# /close
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^\/
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(?<cmd>#{Regexp.new(Regexp.union(names).source, Regexp::IGNORECASE)})
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(?:
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[ ]
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(?<arg>[^\n]*)
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)?
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(?:\s*\n|$)
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)
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(?:
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# Substitution not in a blockquote, blockcode, or HTML tag:
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^\/
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(?<substitution>#{Regexp.new(Regexp.union(sub_names).source, Regexp::IGNORECASE)})
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(?:
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[ ]
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(?<arg>[^\n]*)
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)?
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(?:\s*\n|$)
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)
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}mix
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end
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def command_names(limit_to_commands:)
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command_definitions.flat_map do |command|
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next if command.noop?
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if limit_to_commands && (command.all_names & limit_to_commands).empty?
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next
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end
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command.all_names
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end.compact
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end
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def substitution_names
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substitution_definitions.flat_map { |command| command.all_names }
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.compact
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end
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def substitution_definitions
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@substition_definitions ||= command_definitions.select do |command|
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command.is_a?(Gitlab::QuickActions::SubstitutionDefinition)
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end
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end
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end
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end
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end
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