2017-01-19 19:00:14 -05:00
|
|
|
# frozen_string_literal: true
|
|
|
|
|
|
|
|
class FetchLinkCardService < BaseService
|
2017-09-13 22:11:36 -04:00
|
|
|
include ActionView::Helpers::TagHelper
|
|
|
|
|
2017-04-23 13:08:59 -04:00
|
|
|
URL_PATTERN = %r{https?://\S+}
|
2017-04-18 10:04:13 -04:00
|
|
|
|
2017-01-19 19:00:14 -05:00
|
|
|
def call(status)
|
2017-09-01 10:20:16 -04:00
|
|
|
@status = status
|
|
|
|
@url = parse_urls
|
2017-01-19 19:00:14 -05:00
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
return if @url.nil? || @status.preview_cards.any?
|
2017-01-19 19:00:14 -05:00
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
@url = @url.to_s
|
2017-05-10 17:30:07 -04:00
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
RedisLock.acquire(lock_options) do |lock|
|
|
|
|
if lock.acquired?
|
|
|
|
@card = PreviewCard.find_by(url: @url)
|
2017-09-13 22:11:36 -04:00
|
|
|
process_url if @card.nil? || @card.updated_at <= 2.weeks.ago
|
2017-09-01 10:20:16 -04:00
|
|
|
end
|
|
|
|
end
|
2017-05-10 17:30:07 -04:00
|
|
|
|
2017-09-13 22:11:36 -04:00
|
|
|
attach_card if @card&.persisted?
|
2017-07-03 05:03:34 -04:00
|
|
|
rescue HTTP::ConnectionError, OpenSSL::SSL::SSLError
|
|
|
|
nil
|
2017-04-27 08:42:22 -04:00
|
|
|
end
|
|
|
|
|
|
|
|
private
|
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
def process_url
|
2017-09-13 22:11:36 -04:00
|
|
|
@card ||= PreviewCard.new(url: @url)
|
|
|
|
res = Request.new(:head, @url).perform
|
2017-09-01 10:20:16 -04:00
|
|
|
|
|
|
|
return if res.code != 200 || res.mime_type != 'text/html'
|
|
|
|
|
|
|
|
attempt_oembed || attempt_opengraph
|
|
|
|
end
|
|
|
|
|
|
|
|
def attach_card
|
|
|
|
@status.preview_cards << @card
|
|
|
|
end
|
|
|
|
|
|
|
|
def parse_urls
|
|
|
|
if @status.local?
|
|
|
|
urls = @status.text.match(URL_PATTERN).to_a.map { |uri| Addressable::URI.parse(uri).normalize }
|
2017-05-16 18:41:15 -04:00
|
|
|
else
|
2017-09-01 10:20:16 -04:00
|
|
|
html = Nokogiri::HTML(@status.text)
|
2017-05-16 18:41:15 -04:00
|
|
|
links = html.css('a')
|
|
|
|
urls = links.map { |a| Addressable::URI.parse(a['href']).normalize unless skip_link?(a) }.compact
|
|
|
|
end
|
|
|
|
|
|
|
|
urls.reject { |uri| bad_url?(uri) }.first
|
|
|
|
end
|
|
|
|
|
|
|
|
def bad_url?(uri)
|
|
|
|
# Avoid local instance URLs and invalid URLs
|
2017-06-11 16:53:12 -04:00
|
|
|
uri.host.blank? || TagManager.instance.local_url?(uri.to_s) || !%w(http https).include?(uri.scheme)
|
2017-05-16 18:41:15 -04:00
|
|
|
end
|
|
|
|
|
|
|
|
def skip_link?(a)
|
|
|
|
# Avoid links for hashtags and mentions (microformats)
|
|
|
|
a['rel']&.include?('tag') || a['class']&.include?('u-url')
|
|
|
|
end
|
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
def attempt_oembed
|
|
|
|
response = OEmbed::Providers.get(@url)
|
2017-04-27 08:42:22 -04:00
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
@card.type = response.type
|
|
|
|
@card.title = response.respond_to?(:title) ? response.title : ''
|
|
|
|
@card.author_name = response.respond_to?(:author_name) ? response.author_name : ''
|
|
|
|
@card.author_url = response.respond_to?(:author_url) ? response.author_url : ''
|
|
|
|
@card.provider_name = response.respond_to?(:provider_name) ? response.provider_name : ''
|
|
|
|
@card.provider_url = response.respond_to?(:provider_url) ? response.provider_url : ''
|
|
|
|
@card.width = 0
|
|
|
|
@card.height = 0
|
2017-04-27 08:42:22 -04:00
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
case @card.type
|
2017-04-27 08:42:22 -04:00
|
|
|
when 'link'
|
2017-09-01 10:20:16 -04:00
|
|
|
@card.image = URI.parse(response.thumbnail_url) if response.respond_to?(:thumbnail_url)
|
2017-04-27 08:42:22 -04:00
|
|
|
when 'photo'
|
2017-09-01 10:20:16 -04:00
|
|
|
@card.url = response.url
|
|
|
|
@card.width = response.width.presence || 0
|
|
|
|
@card.height = response.height.presence || 0
|
2017-04-27 08:42:22 -04:00
|
|
|
when 'video'
|
2017-09-01 10:20:16 -04:00
|
|
|
@card.width = response.width.presence || 0
|
|
|
|
@card.height = response.height.presence || 0
|
|
|
|
@card.html = Formatter.instance.sanitize(response.html, Sanitize::Config::MASTODON_OEMBED)
|
2017-04-27 08:42:22 -04:00
|
|
|
when 'rich'
|
|
|
|
# Most providers rely on <script> tags, which is a no-no
|
|
|
|
return false
|
|
|
|
end
|
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
@card.save_with_optional_image!
|
2017-04-27 08:42:22 -04:00
|
|
|
rescue OEmbed::NotFound
|
|
|
|
false
|
|
|
|
end
|
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
def attempt_opengraph
|
|
|
|
response = Request.new(:get, @url).perform
|
2017-01-19 19:00:14 -05:00
|
|
|
|
2017-01-24 18:49:08 -05:00
|
|
|
return if response.code != 200 || response.mime_type != 'text/html'
|
2017-01-19 19:00:14 -05:00
|
|
|
|
2017-07-05 08:54:21 -04:00
|
|
|
html = response.to_s
|
2017-07-08 16:44:31 -04:00
|
|
|
|
|
|
|
detector = CharlockHolmes::EncodingDetector.new
|
|
|
|
detector.strip_tags = true
|
|
|
|
|
|
|
|
guess = detector.detect(html, response.charset)
|
2017-09-01 10:20:16 -04:00
|
|
|
page = Nokogiri::HTML(html, nil, guess&.fetch(:encoding))
|
2017-01-19 19:00:14 -05:00
|
|
|
|
2017-09-13 22:11:36 -04:00
|
|
|
if meta_property(page, 'twitter:player')
|
|
|
|
@card.type = :video
|
|
|
|
@card.width = meta_property(page, 'twitter:player:width') || 0
|
|
|
|
@card.height = meta_property(page, 'twitter:player:height') || 0
|
|
|
|
@card.html = content_tag(:iframe, nil, src: meta_property(page, 'twitter:player'),
|
|
|
|
width: @card.width,
|
|
|
|
height: @card.height,
|
|
|
|
allowtransparency: 'true',
|
|
|
|
scrolling: 'no',
|
|
|
|
frameborder: '0')
|
|
|
|
else
|
|
|
|
@card.type = :link
|
|
|
|
@card.image_remote_url = meta_property(page, 'og:image') if meta_property(page, 'og:image')
|
|
|
|
end
|
|
|
|
|
|
|
|
@card.title = meta_property(page, 'og:title').presence || page.at_xpath('//title')&.content || ''
|
|
|
|
@card.description = meta_property(page, 'og:description').presence || meta_property(page, 'description') || ''
|
2017-01-19 19:00:14 -05:00
|
|
|
|
2017-09-13 22:11:36 -04:00
|
|
|
return if @card.title.blank? && @card.html.blank?
|
2017-01-24 18:49:08 -05:00
|
|
|
|
2017-09-01 10:20:16 -04:00
|
|
|
@card.save_with_optional_image!
|
2017-01-19 19:00:14 -05:00
|
|
|
end
|
|
|
|
|
|
|
|
def meta_property(html, property)
|
|
|
|
html.at_xpath("//meta[@property=\"#{property}\"]")&.attribute('content')&.value || html.at_xpath("//meta[@name=\"#{property}\"]")&.attribute('content')&.value
|
|
|
|
end
|
2017-09-01 10:20:16 -04:00
|
|
|
|
|
|
|
def lock_options
|
|
|
|
{ redis: Redis.current, key: "fetch:#{@url}" }
|
|
|
|
end
|
2017-01-19 19:00:14 -05:00
|
|
|
end
|