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# frozen_string_literal: true
require 'singleton'
require_relative './sanitize_config'
class Formatter
include Singleton
include RoutingHelper
include ActionView::Helpers::TextHelper
def format(status, options = {})
if status.reblog?
prepend_reblog = status.reblog.account.acct
status = status.proper
else
prepend_reblog = false
end
raw_content = status.text
unless status.local?
html = reformat(raw_content)
html = encode_custom_emojis(html, status.emojis) if options[:custom_emojify]
return html.html_safe # rubocop:disable Rails/OutputSafety
end
linkable_accounts = status.mentions.map(&:account)
linkable_accounts << status.account
html = raw_content
html = "RT @#{prepend_reblog} #{html}" if prepend_reblog
html = encode_and_link_urls(html, linkable_accounts)
html = encode_custom_emojis(html, status.emojis) if options[:custom_emojify]
html = simple_format(html, {}, sanitize: false)
html = html.delete("\n")
html.html_safe # rubocop:disable Rails/OutputSafety
end
def reformat(html)
sanitize(html, Sanitize::Config::MASTODON_STRICT)
end
def plaintext(status)
return status.text if status.local?
text = status.text.gsub(/(<br \/>|<br>|<\/p>)+/) { |match| "#{match}\n" }
strip_tags(text)
end
def simplified_format(account)
return reformat(account.note) unless account.local?
html = encode_and_link_urls(account.note)
html = simple_format(html, {}, sanitize: false)
html = html.delete("\n")
html.html_safe # rubocop:disable Rails/OutputSafety
end
def sanitize(html, config)
Sanitize.fragment(html, config)
end
private
def encode(html)
HTMLEntities.new.encode(html)
end
def encode_and_link_urls(html, accounts = nil)
entities = Extractor.extract_entities_with_indices(html, extract_url_without_protocol: false)
rewrite(html.dup, entities) do |entity|
if entity[:url]
link_to_url(entity)
elsif entity[:hashtag]
link_to_hashtag(entity)
elsif entity[:screen_name]
link_to_mention(entity, accounts)
end
end
end
def encode_custom_emojis(html, emojis)
return html if emojis.empty?
emoji_map = emojis.map { |e| [e.shortcode, full_asset_url(e.image.url)] }.to_h
i = -1
inside_tag = false
inside_shortname = false
shortname_start_index = -1
while i + 1 < html.size
i += 1
if inside_shortname && html[i] == ':'
shortcode = html[shortname_start_index + 1..i - 1]
emoji = emoji_map[shortcode]
if emoji
replacement = "<img draggable=\"false\" class=\"emojione\" alt=\":#{shortcode}:\" title=\":#{shortcode}:\" src=\"#{emoji}\" />"
before_html = shortname_start_index.positive? ? html[0..shortname_start_index - 1] : ''
html = before_html + replacement + html[i + 1..-1]
i += replacement.size - (shortcode.size + 2) - 1
else
i -= 1
end
inside_shortname = false
elsif inside_tag && html[i] == '>'
inside_tag = false
elsif html[i] == '<'
inside_tag = true
inside_shortname = false
elsif !inside_tag && html[i] == ':'
inside_shortname = true
shortname_start_index = i
end
end
html
end
def rewrite(text, entities)
chars = text.to_s.to_char_a
# Sort by start index
entities = entities.sort_by do |entity|
indices = entity.respond_to?(:indices) ? entity.indices : entity[:indices]
indices.first
end
result = []
last_index = entities.reduce(0) do |index, entity|
indices = entity.respond_to?(:indices) ? entity.indices : entity[:indices]
result << encode(chars[index...indices.first].join)
result << yield(entity)
indices.last
end
result << encode(chars[last_index..-1].join)
result.flatten.join
end
def link_to_url(entity)
normalized_url = Addressable::URI.parse(entity[:url]).normalize
html_attrs = { target: '_blank', rel: 'nofollow noopener' }
Twitter::Autolink.send(:link_to_text, entity, link_html(entity[:url]), normalized_url, html_attrs)
rescue Addressable::URI::InvalidURIError, IDN::Idna::IdnaError
encode(entity[:url])
end
def link_to_mention(entity, linkable_accounts)
acct = entity[:screen_name]
return link_to_account(acct) unless linkable_accounts
account = linkable_accounts.find { |item| TagManager.instance.same_acct?(item.acct, acct) }
account ? mention_html(account) : "@#{acct}"
end
def link_to_account(acct)
username, domain = acct.split('@')
domain = nil if TagManager.instance.local_domain?(domain)
account = Account.find_remote(username, domain)
account ? mention_html(account) : "@#{acct}"
end
def link_to_hashtag(entity)
hashtag_html(entity[:hashtag])
end
def link_html(url)
url = Addressable::URI.parse(url).to_s
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\">#{encode(prefix)}</span><span class=\"#{cutoff ? 'ellipsis' : ''}\">#{encode(text)}</span><span class=\"invisible\">#{encode(suffix)}</span>"
end
def hashtag_html(tag)
"<a href=\"#{tag_url(tag.downcase)}\" class=\"mention hashtag\" rel=\"tag\">#<span>#{tag}</span></a>"
end
def mention_html(account)
"<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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