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# frozen_string_literal: true
class Sanitize
extend UrlHelper
module Config
HTTP_PROTOCOLS ||= ['http', 'https', 'dat', 'dweb', 'ipfs', 'ipns', 'ssb', 'gopher', :relative].freeze
MEDIA_EXTENSIONS ||= %w(png apng jpg jpe jpeg mpg mpeg mpeg4 mp4 mp3 aac ogg oga ogv qt gif)
CLASS_WHITELIST_TRANSFORMER = lambda do |env|
node = env[:node]
class_list = node['class']&.split(/[\t\n\f\r ]/)
return unless class_list
class_list.keep_if do |e|
next true if e =~ /^(h|p|u|dt|e)-/ # microformats classes
next true if e =~ /^(mention|hashtag)$/ # semantic classes
next true if e =~ /^(ellipsis|invisible)$/ # link formatting classes
next true if e =~ /^bbcode__([a-z1-6\-]+)$/ # bbcode
next true if e == 'signature'
end
node['class'] = class_list.join(' ')
end
IMG_TAG_TRANSFORMER = lambda do |env|
node = env[:node]
return unless env[:node_name] == 'img'
node.name = 'a'
node['href'] = node['src']
if node['alt'].present?
node.content = "[🖼 #{node['alt']}]"
else
url = node['href']
prefix = url.match(/\Ahttps?:\/\/(www\.)?/).to_s
text = url[prefix.length, 30]
text = text + "…" if url[prefix.length..-1].length > 30
node.content = "[🖼 #{text}]"
end
end
QUERY_STRING_SANITIZER = lambda do |env|
return unless %w(a blockquote embed iframe source).include?(env[:node_name])
node = env[:node]
['href', 'src', 'cite'].each do |attr|
next if node[attr].blank?
url = Sanitize::sanitize_query_string(node[attr])
next if url.blank?
node[attr] = url
end
end
MASTODON_STRICT ||= freeze_config(
elements: %w(p br span a abbr del pre sub sup blockquote code b strong u i s em h1 h2 h3 h4 h5 h6 ul ol li hr),
attributes: {
'a' => %w(href rel class title alt),
'span' => %w(class),
'abbr' => %w(title),
'blockquote' => %w(cite),
'p' => %w(class),
:all => %w(aria-hidden aria-label lang),
},
add_attributes: {
'a' => {
'rel' => 'nofollow noopener tag',
'target' => '_blank',
},
},
protocols: {
'a' => { 'href' => HTTP_PROTOCOLS },
'blockquote' => { 'cite' => HTTP_PROTOCOLS },
},
transformers: [
CLASS_WHITELIST_TRANSFORMER,
QUERY_STRING_SANITIZER,
IMG_TAG_TRANSFORMER,
]
)
MASTODON_OEMBED ||= freeze_config merge(
RELAXED,
elements: RELAXED[:elements] + %w(audio embed iframe source video),
attributes: merge(
RELAXED[:attributes],
'audio' => %w(controls),
'embed' => %w(height src type width),
'iframe' => %w(allowfullscreen frameborder height scrolling src width),
'source' => %w(src type),
'video' => %w(controls height loop width),
'div' => [:data]
),
protocols: merge(
RELAXED[:protocols],
'embed' => { 'src' => HTTP_PROTOCOLS },
'iframe' => { 'src' => HTTP_PROTOCOLS },
'source' => { 'src' => HTTP_PROTOCOLS }
),
transformers: [QUERY_STRING_SANITIZER]
)
end
end
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