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# frozen_string_literal: true
require 'singleton'
class Formatter
include Singleton
include RoutingHelper
include ActionView::Helpers::TextHelper
include ActionView::Helpers::SanitizeHelper
def format(status)
return reformat(status.content) unless status.local?
html = status.text
html = encode_and_link_urls(html)
html = simple_format(html, {}, sanitize: false)
html = html.delete("\n")
html = link_mentions(html, status.mentions)
html = link_hashtags(html)
html.html_safe # rubocop:disable Rails/OutputSafety
end
def reformat(html)
sanitize(html, tags: %w(a br p span), attributes: %w(href rel class))
end
def plaintext(status)
return status.text if status.local?
strip_tags(status.text)
end
def simplified_format(account)
return reformat(account.note) unless account.local?
html = encode_and_link_urls(account.note)
html = link_accounts(html)
html = link_hashtags(html)
html.html_safe # rubocop:disable Rails/OutputSafety
end
private
def encode(html)
HTMLEntities.new.encode(html)
end
def encode_and_link_urls(html)
entities = Twitter::Extractor.extract_urls_with_indices(html, extract_url_without_protocol: false)
entities = entities.sort_by { |entity| entity[:indices].first }
chars = html.to_s.to_char_a
html_attrs = {
target: '_blank',
rel: 'nofollow noopener',
}
result = ''
last_index = entities.reduce(0) do |index, entity|
indices = entity[:indices]
result += encode(chars[index...indices.first].join)
result += Twitter::Autolink.send(:link_to_text, entity, link_html(entity[:url]), entity[:url], html_attrs)
indices.last
end
result += encode(chars[last_index..-1].join)
end
def link_urls(html)
Twitter::Autolink.auto_link_urls(html, url_target: '_blank',
link_attribute_block: lambda { |_, a| a[:rel] << ' noopener' },
link_text_block: lambda { |_, text| link_html(text) })
end
def link_mentions(html, mentions)
html.gsub(Account::MENTION_RE) do |match|
acct = Account::MENTION_RE.match(match)[1]
mention = mentions.find { |item| TagManager.instance.same_acct?(item.account.acct, acct) }
mention.nil? ? match : mention_html(match, mention.account)
end
end
def link_accounts(html)
html.gsub(Account::MENTION_RE) do |match|
acct = Account::MENTION_RE.match(match)[1]
username, domain = acct.split('@')
domain = nil if TagManager.instance.local_domain?(domain)
account = Account.find_remote(username, domain)
account.nil? ? match : mention_html(match, account)
end
end
def link_hashtags(html)
html.gsub(Tag::HASHTAG_RE) do |match|
hashtag_html(match)
end
end
def link_html(url)
prefix = url.match(/\Ahttps?:\/\/(www\.)?/).to_s
text = url[prefix.length, 30]
suffix = url[prefix.length + 30..-1]
cutoff = url[prefix.length..-1].length > 30
"<span class=\"invisible\">#{prefix}</span><span class=\"#{cutoff ? 'ellipsis' : ''}\">#{text}</span><span class=\"invisible\">#{suffix}</span>"
end
def hashtag_html(match)
prefix, _, affix = match.rpartition('#')
"#{prefix}<a href=\"#{tag_url(affix.downcase)}\" class=\"mention hashtag\">#<span>#{affix}</span></a>"
end
def mention_html(match, account)
"#{match.split('@').first}<span class=\"h-card\"><a href=\"#{TagManager.instance.url_for(account)}\" class=\"u-url mention\">@<span>#{account.username}</span></a></span>"
end
end
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