require 'open-uri' require 'nokogiri' require 'excon' require_dependency 'retrieve_title' require_dependency 'topic_link' module Jobs class CrawlTopicLink < Jobs::Base def execute(args) raise Discourse::InvalidParameters.new(:topic_link_id) unless args[:topic_link_id].present? topic_link = TopicLink.find_by(id: args[:topic_link_id], internal: false, crawled_at: nil) return if topic_link.blank? # Look for a topic embed for the URL. If it exists, use its title and don't crawl topic_embed = TopicEmbed.where(embed_url: topic_link.url).includes(:topic).references(:topic).first # topic could be deleted, so skip if topic_embed && topic_embed.topic TopicLink.where(id: topic_link.id).update_all(['title = ?, crawled_at = CURRENT_TIMESTAMP', topic_embed.topic.title[0..255]]) return end begin crawled = false # Special case: Images # If the link is to an image, put the filename as the title if FileHelper.is_image?(topic_link.url) uri = URI(topic_link.url) filename = File.basename(uri.path) crawled = (TopicLink.where(id: topic_link.id).update_all(["title = ?, crawled_at = CURRENT_TIMESTAMP", filename]) == 1) end unless crawled # Fetch the beginning of the document to find the title title = RetrieveTitle.crawl(topic_link.url) if title.present? crawled = (TopicLink.where(id: topic_link.id).update_all(['title = ?, crawled_at = CURRENT_TIMESTAMP', title[0..254]]) == 1) end end rescue Exception # If there was a connection error, do nothing ensure TopicLink.where(id: topic_link.id).update_all('crawled_at = CURRENT_TIMESTAMP') if !crawled && topic_link.present? end end end end