92 lines
2.5 KiB
Ruby
92 lines
2.5 KiB
Ruby
# frozen_string_literal: true
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class Sanitize
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module Config
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HTTP_PROTOCOLS ||= ['http', 'https', 'dat', 'dweb', 'ipfs', 'ipns', 'ssb', 'gopher', :relative].freeze
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CLASS_WHITELIST_TRANSFORMER = lambda do |env|
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node = env[:node]
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class_list = node['class']&.split(/[\t\n\f\r ]/)
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return unless class_list
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class_list.keep_if do |e|
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next true if e =~ /^(h|p|u|dt|e)-/ # microformats classes
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next true if e =~ /^(mention|hashtag)$/ # semantic classes
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next true if e =~ /^(ellipsis|invisible)$/ # link formatting classes
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end
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node['class'] = class_list.join(' ')
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end
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IMG_TAG_TRANSFORMER = lambda do |env|
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node = env[:node]
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return unless env[:node_name] == 'img'
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node.name = 'a'
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node['href'] = node['src']
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if node['alt'].present?
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node.content = "[🖼 #{node['alt']}]"
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else
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url = node['href']
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prefix = url.match(/\Ahttps?:\/\/(www\.)?/).to_s
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text = url[prefix.length, 30]
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text = text + "…" if url[prefix.length..-1].length > 30
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node.content = "[🖼 #{text}]"
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end
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end
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MASTODON_STRICT ||= freeze_config(
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elements: %w(p br span a abbr del pre blockquote code b strong u sub i em h1 h2 h3 h4 h5 ul ol li),
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attributes: {
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'a' => %w(href rel class title),
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'span' => %w(class),
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'abbr' => %w(title),
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'blockquote' => %w(cite),
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},
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add_attributes: {
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'a' => {
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'rel' => 'nofollow noopener tag',
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'target' => '_blank',
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},
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},
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protocols: {
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'a' => { 'href' => HTTP_PROTOCOLS },
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'blockquote' => { 'cite' => HTTP_PROTOCOLS },
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},
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transformers: [
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CLASS_WHITELIST_TRANSFORMER,
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IMG_TAG_TRANSFORMER,
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]
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)
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MASTODON_OEMBED ||= freeze_config merge(
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RELAXED,
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elements: RELAXED[:elements] + %w(audio embed iframe source video),
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attributes: merge(
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RELAXED[:attributes],
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'audio' => %w(controls),
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'embed' => %w(height src type width),
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'iframe' => %w(allowfullscreen frameborder height scrolling src width),
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'source' => %w(src type),
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'video' => %w(controls height loop width),
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'div' => [:data]
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),
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protocols: merge(
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RELAXED[:protocols],
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'embed' => { 'src' => HTTP_PROTOCOLS },
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'iframe' => { 'src' => HTTP_PROTOCOLS },
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'source' => { 'src' => HTTP_PROTOCOLS }
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)
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)
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end
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end
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