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element.rb
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element.rb
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# frozen_string_literal: true
require 'addressable/uri'
require_relative './utils'
module HTMLProofer
# Represents the element currently being processed
class Element
include HTMLProofer::Utils
attr_reader :id, :name, :alt, :href, :link, :src, :line, :data_proofer_ignore
def initialize(obj, check, logger)
@logger = logger
# Construct readable ivars for every element
begin
obj.attributes.each_pair do |attribute, value|
name = attribute.tr('-:.;@', '_').to_s.to_sym
(class << self; self; end).send(:attr_reader, name)
instance_variable_set("@#{name}", value.value)
end
rescue NameError => e
@logger.log :error, "Attribute set `#{obj}` contains an error!"
raise e
end
@aria_hidden = defined?(@aria_hidden) && @aria_hidden == 'true'
@data_proofer_ignore = defined?(@data_proofer_ignore)
@text = obj.content
@check = check
@checked_paths = {}
@type = check.class.name
@line = obj.line
@html = check.html
parent_attributes = obj.ancestors.map { |a| a.respond_to?(:attributes) && a.attributes }
parent_attributes.pop # remove document at the end
@parent_ignorable = parent_attributes.any? { |a| !a['data-proofer-ignore'].nil? }
# fix up missing protocols
if defined?(@href)
@href.insert(0, 'http:') if %r{^//}.match?(@href)
else
@href = nil
end
if defined?(@src)
@src.insert(0, 'http:') if %r{^//}.match?(@src)
else
@src = nil
end
if defined?(@srcset)
@srcset.insert(0, 'http:') if %r{^//}.match?(@srcset)
else
@srcset = nil
end
end
def url
return @url if defined?(@url)
@url = (@src || @srcset || @href || '').delete("\u200b").strip
@url = Addressable::URI.join(base.attr('href') || '', url).to_s if base
return @url if @check.options[:url_swap].empty?
@url = swap(@url, @check.options[:url_swap])
end
def valid?
!parts.nil?
end
def path?
!parts.host.nil? && !parts.path.nil?
end
def parts
@parts ||= Addressable::URI.parse url
rescue URI::Error, Addressable::URI::InvalidURIError
@parts = nil
end
def path
Addressable::URI.unencode parts.path unless parts.nil?
end
def hash
parts&.fragment
end
def scheme
parts&.scheme
end
# path is to an external server
def remote?
%w[http https].include? scheme
end
def non_http_remote?
!scheme.nil? && !remote?
end
def ignore?
return true if @data_proofer_ignore
return true if @parent_ignorable
return true if /^javascript:/.match?(url)
# ignore base64 encoded images
return true if %w[ImageCheck FaviconCheck].include?(@type) && /^data:image/.match?(url)
# ignore user defined URLs
return true if ignores_pattern_check(@check.options[:url_ignore])
end
def ignore_alt?
return true if ignores_pattern_check(@check.options[:alt_ignore]) || @aria_hidden
end
def ignore_empty_alt?
@check.options[:empty_alt_ignore]
end
def allow_missing_href?
@check.options[:allow_missing_href]
end
def allow_hash_href?
@check.options[:allow_hash_href]
end
def check_img_http?
@check.options[:check_img_http]
end
def check_sri?
@check.options[:check_sri]
end
# path is external to the file
def external?
!internal?
end
def internal?
relative_link? || internal_absolute_link?
end
def internal_absolute_link?
url.start_with?('/')
end
def relative_link?
return false if remote?
hash_link || param_link || url.start_with?('.') || url =~ /^\S/
end
def link_points_to_same_page?
hash_link || param_link
end
def hash_link
url.start_with?('#')
end
def param_link
url.start_with?('?')
end
def absolute_path?(path)
path.start_with?('/')
end
def file_path
return if path.nil? || path.empty?
path_dot_ext = ''
path_dot_ext = path + @check.options[:extension] if @check.options[:assume_extension]
base = if absolute_path?(path) # path relative to root
# either overwrite with root_dir; or, if source is directory, use that; or, just get the current file's dirname
@check.options[:root_dir] || (File.directory?(@check.src) ? @check.src : File.dirname(@check.src))
elsif File.exist?(File.expand_path(path, @check.src)) || File.exist?(File.expand_path(path_dot_ext, @check.src)) # relative links, path is a file
File.dirname(@check.path)
elsif File.exist?(File.join(File.dirname(@check.path), path)) || File.exist?(File.join(File.dirname(@check.path), path_dot_ext)) # rubocop:disable Lint/DuplicateBranch; relative links in nested dir, path is a file
File.dirname(@check.path)
else # relative link, path is a directory
@check.path
end
file = File.join(base, path)
if @check.options[:assume_extension] && File.file?("#{file}#{@check.options[:extension]}")
file = "#{file}#{@check.options[:extension]}"
elsif File.directory?(file) && !unslashed_directory?(file) # implicit index support
file = File.join file, @check.options[:directory_index_file]
end
file
end
# checks if a file exists relative to the current pwd
def exists?
return @checked_paths[absolute_path] if @checked_paths.key?(absolute_path)
@checked_paths[absolute_path] = File.exist?(absolute_path)
end
def absolute_path
path = file_path || @check.path
File.expand_path(path, Dir.pwd)
end
def ignores_pattern_check(links)
return false unless links.is_a?(Array)
links.each do |ignore|
case ignore
when String
return true if ignore == url
when Regexp
return true if ignore&.match?(url)
end
end
false
end
def unslashed_directory?(file)
File.directory?(file) && !file.end_with?(File::SEPARATOR) && !follow_location?
end
def follow_location?
@check.options[:typhoeus] && @check.options[:typhoeus][:followlocation]
end
def base
@base ||= @html.at_css('base')
end
def html
# If link is on the same page, then URL is on the current page. use the same HTML as for current page
if link_points_to_same_page?
@html
elsif internal?
# link on another page, e.g. /about#Team - need to get HTML from the other page
create_nokogiri(absolute_path)
else
raise NotImplementedError, 'HTMLProofer should not have gotten here. Please report this as a bug.'
end
end
end
end