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|
# frozen_string_literal: true
# .~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~. #
################### Cthulhu Code! ###################
# `~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~` #
# - Interprets and executes user input. THIS CAN BE VERY DANGEROUS! #
# - Has a high complexity level and needs tests. #
# - May destroy objects passed to it. #
# - Incurs a high performance penalty. #
# #
###############################################################################
require_relative 'commands'
class CommandTag::Break < Mastodon::Error
def initialize(msg = 'A handler stopped execution.')
super
end
end
class CommandTag::Processor
include Redisable
include ImgProxyHelper
include CommandTag::Commands
MENTIONS_OR_HASHTAGS_RE = /(?:(?:#{Account::MENTION_RE}|#{Tag::HASHTAG_RE})\s*)+/.freeze
PARSEABLE_RE = /^\s*(?:#{MENTIONS_OR_HASHTAGS_RE})?#!|%%.+?%%/.freeze
STATEMENT_RE = /^\s*#!\s*[^\n]+ (?:start|begin|do)$.*?\n\s*#!\s*(?:end|stop|done)\s*$|^\s*#!\s*.*?\s*$/im.freeze
STATEMENT_PARSE_RE = /'([^']*)'|"([^"]*)"|(\S+)|\s+(?:start|begin|do)\s*$\n+(.*)\n\s*#!\s*(?:end|stop|done)\s*\z/im.freeze
TEMPLATE_RE = /%%\s*(\S+.*?)\s*%%/.freeze
ESCAPE_MAP = {
'\n' => "\n",
'\r' => "\r",
'\t' => "\t",
'\\\\' => '\\',
'\%' => '%',
}.freeze
def initialize(account, status)
@account = account
@status = status
@parent = status.thread
@conversation = status.conversation
@text = status.text
@run_once = Set[]
@vars = { 'statement_uuid' => [nil] }
@statements = {}
return unless @account.present? && @account.local? && @status.present?
end
def process!
reset_status_caches
all_handlers!(:startup)
unless @text.match?(PARSEABLE_RE)
process_inline_images!
@status.save!
return
end
@text = parse_statements_from!(@text, @statements)
execute_statements(:at_start)
execute_statements(:with_return, true)
@text = replace_templates(@text)
execute_statements(:before_save)
if status_text_blank?
execute_statements(:when_blank)
unless (@status.published? && !@status.edited.zero?) || @text.present?
execute_statements(:before_destroy)
@status.update(published: false)
@status.destroy
execute_statements(:after_destroy)
end
elsif @status.destroyed?
execute_statements(:after_destroy)
else
@status.text = @text
process_inline_images!
if @status.save
execute_statements(:after_save)
else
execute_statements(:after_save_fail)
end
end
execute_statements(:at_end)
all_handlers!(:shutdown)
rescue CommandTag::Break
nil
rescue StandardError
@status.update(published: false)
@status.destroy
raise
ensure
reset_status_caches
end
private
def all_handlers!(affix)
self.class.instance_methods.grep(/\Ahandle_\w+_#{affix}\z/).sort.each do |name|
public_send(name)
end
end
# Calls an arbitary public method (if it exists) on a given value and returns the result.
def transform_using(name, value, args = [])
respond_to?(name) ? public_send(name, value, args) : value
end
# Moves command tags placed after hashtags and mentions to their own line.
def prepare_input(text)
text.gsub(/\r\n|\n\r|\r/, "\n").gsub(/^\s*(#{MENTIONS_OR_HASHTAGS_RE})#!/, "\\1\n#!")
end
# Translates %%...%% templates.
def replace_templates(text)
text.gsub(TEMPLATE_RE) do
template = unescape_literals(Regexp.last_match(1))
next if template.blank?
next template[1..-2] if template.match?(/\A'.*'\z/)
template = template.match?(/\A".*"\z/) ? template[1..-2] : "\#{#{template}}"
template.gsub(/#\{\s*(.*?)\s*\}/) do
next if Regexp.last_match(1).blank?
parts = Regexp.last_match(1).scan(/'([^']*)'|"([^"]*)"|(\S+)/).flatten.compact
name = normalize(parts[0])
separator = "\n"
if parts.count > 2
if %w(: by: with: using: sep: separator: delim: delimiter:).include?(parts[-2].downcase)
separator = parts[-1]
parts = parts[0..-3]
elsif !parts[-1].match?(/\A[-+]?[0-9]+\z/)
separator = parts[-1]
parts.pop
end
end
index = to_integer(parts[1])
str_start = to_integer(parts[2])
str_end = to_integer(parts[3])
str_start, str_end = [str_end, str_start] if str_start > str_end
old_value = (['all', '[]'].include?(parts[1]) ? var(name).join(separator) : var(name)[index].to_s)
name = name.gsub(/[^\w_]+/, '_')
new_value = transform_using("transform_#{name}_template_return", old_value, [index, str_start, str_end])
next new_value if new_value != old_value
new_value = transform_using("transform_#{name}_template_value", new_value, [index, str_start, str_end])
(str_end - str_start).zero? ? new_value : new_value[str_start..str_end]
end
end.rstrip
end
# Parses statements from text and merges them into statement queues.
# Mutates statement queues hash!
def parse_statements_from!(text, statement_queues)
@run_once.clear
text = prepare_input(text)
text.gsub!(STATEMENT_RE) do
statement = unescape_literals(Regexp.last_match(0).strip[2..-1])
next if statement.blank?
statement_array = statement.scan(STATEMENT_PARSE_RE).flatten.compact.map { |arg| arg.gsub('\#!', '#!') }
statement_array[0] = statement_array[0].strip.tr(':.\- ', '_').gsub(/__+/, '_').downcase
next unless statement_array[0].match?(/\A[\w_]+\z/)
statement_array[-1].rstrip! if statement_array.count > 1
add_statement_handlers_for!(statement_array, statement_queues)
end
@run_once.clear
text
end
# Yields all possible handler names for a command.
def potential_handlers_for(name)
['_once', ''].each_with_index do |count_affix, index|
%w(at_start with_return when_blank at_end).each do |when_affix|
yield ["#{count_affix}_#{when_affix}", "handle_#{name}#{count_affix}_#{when_affix}", index.zero?]
end
%w(destroy save postprocess save_fail).each do |event_affix|
%w(before after).each do |when_affix|
yield ["#{count_affix}_#{when_affix}_#{event_affix}", "handle_#{name}#{count_affix}_#{when_affix}_#{event_affix}", index.zero?]
end
end
end
end
# Expands a statement to a handler method call, arguments, and template UUID for each handler affix.
# Mutates statement queues hash!
def add_statement_handlers_for!(statement_array, statement_queues = {})
statement_uuid = SecureRandom.uuid
potential_handlers_for(statement_array[0]) do |when_affix, handler, once|
if !(once && @run_once.include?(handler)) && respond_to?(handler)
statement_queues[when_affix] ||= []
statement_queues[when_affix] << [handler, statement_array[1..-1], statement_uuid]
@run_once << handler if once
end
end
# Template for statement return value.
"%% statement:#{statement_uuid} all %%"
end
# Calls all handlers for a queue of statements in order.
def execute_statements(event, with_return = false, statements: nil)
statements = @statements if statements.blank?
["_#{event}", "_once_#{event}"].each do |when_affix|
next if statements[when_affix].blank?
statements[when_affix].each do |handler, arguments, uuid|
@vars['statement_uuid'][0] = uuid
if with_return
@vars["statement:#{uuid}"] = [public_send(handler, arguments)]
else
public_send(handler, arguments)
end
end
end
end
# Expire cached statuses after potentially updating them.
def reset_status_caches(statuses = nil)
statuses = [@status, @parent] if statuses.blank?
statuses.each do |status|
next unless @account.id == status&.account_id
Rails.cache.delete_matched("statuses/#{status.id}-*")
Rails.cache.delete("statuses/#{status.id}")
Rails.cache.delete(status)
Rails.cache.delete_matched("format:#{status.id}:*")
redis.zremrangebyscore("spam_check:#{status.account.id}", status.id, status.id)
end
end
def author_of_status?
@account.id == @status.account_id
end
def author_of_parent?
@account.id == @parent&.account_id
end
def status_text_blank?
@text.blank? || @text.gsub(MENTIONS_OR_HASHTAGS_RE, '').strip.blank?
end
def destroy_status!
return if @status.destroyed?
@status.update(published: false)
@status.destroy
end
def replace_status!(new_status)
return if new_status.blank?
destroy_status!
@status = new_status
end
def normalize(text)
text.to_s.strip.downcase
end
def to_integer(text)
text&.strip.to_i
end
def unescape_literals(text)
ESCAPE_MAP.each { |escaped, unescaped| text.gsub!(escaped, unescaped) }
text
end
def html_encode(text)
(@html_entities ||= HTMLEntities.new).encode(text)
end
def var(name)
@vars[name].presence || []
end
def read_visibility_from(arg)
return if arg.strip.blank?
arg = case arg.strip
when 'p', 'pu', 'all', 'world'
'public'
when 'u', 'ul'
'unlisted'
when 'f', 'follower', 'followers', 'packmates', 'follower-only', 'followers-only', 'packmates-only'
'private'
when 'd', 'dm', 'pm', 'directmessage'
'direct'
when 'default', 'reset'
@account.user.setting_default_privacy
when 'to', 'allow', 'allow-from', 'from'
'cc'
when 'm', 'l', 'mp', 'monsterpit', 'local'
'community'
else
arg.strip
end
%w(public unlisted private limited direct cc community).include?(arg) ? arg : nil
end
def read_falsy_from(arg)
%w(f n false no off disable).include?(arg)
end
def read_truthy_from(arg)
%w(t y true yes on enable).include?(arg)
end
def read_boolean_from(arg)
arg.present? && (read_truthy_from(arg) || !read_falsy_from(arg))
end
def normalize_domain(domain)
return if domain&.strip.blank? || !domain.include?('.')
domain.split('.').map(&:strip).reject(&:blank?).join('.').downcase
end
def federating_with_domain?(domain)
return false if domain.blank?
DomainAllow.where(domain: domain).exists? || Account.where(domain: domain, suspended_at: nil).exists?
end
end
|