require "http/client" require "json" require "kemal" require "pg" require "xml" require "time" PG_DB = DB.open "postgres://kemal:kemal@localhost:5432/invidious" CONTEXT = OpenSSL::SSL::Context::Client.insecure macro templated(filename) render "src/views/#{{{filename}}}.ecr", "src/views/layout.ecr" end class Video module HTTPParamConverter def self.from_rs(rs) HTTP::Params.parse(rs.read(String)) end end module XMLConverter def self.from_rs(rs) XML.parse(rs.read(String)) end end def initialize(id, info, html, updated) @id = id @info = info @html = html @updated = updated end def to_a return [@id, @info, @html, @updated] end DB.mapping({ id: String, info: { type: HTTP::Params, default: HTTP::Params.parse(""), converter: Video::HTTPParamConverter, }, html: { type: XML::Node, default: XML.parse(""), converter: Video::XMLConverter, }, updated: Time, }) end # See http://www.evanmiller.org/how-not-to-sort-by-average-rating.html def ci_lower_bound(pos, n) if n == 0 return 0 end # z value here represents a confidence level of 0.95 z = 1.96 phat = 1.0*pos/n return (phat + z*z/(2*n) - z * Math.sqrt((phat*(1 - phat) + z*z/(4*n))/n))/(1 + z*z/n) end def fetch_video(id) client = HTTP::Client.new("www.youtube.com", 443, CONTEXT) info = client.get("/get_video_info?video_id=#{id}&el=info&ps=default&eurl=&gl=US&hl=en").body info = HTTP::Params.parse(info) html = client.get("/watch?v=#{id}").body html = XML.parse(html) if info["reason"]? raise info["reason"] end video = Video.new(id, info, html, Time.now) return video end def get_video(id) if PG_DB.query_one?("SELECT EXISTS ( SELECT true FROM videos WHERE id = $1)", id, as: Bool) video = PG_DB.query_one("SELECT * FROM videos WHERE id = $1", id, as: Video) # If record was last updated more than 5 hours ago, refresh (expire param in response lasts for 6 hours) if Time.now - video.updated > Time::Span.new(0, 5, 0, 0) video = fetch_video(id) end else video = fetch_video(id) PG_DB.exec("INSERT INTO videos VALUES ($1, $2, $3, $4)", video.to_a) end return video end get "/" do |env| templated "index" end get "/watch" do |env| id = env.params.query["v"] begin video = get_video(id) rescue ex error_message = ex.message next templated "error" end if env.params.query["listen"]? && env.params.query["listen"] == "true" env.request.query_params.delete_all("listen") listen = true else env.request.query_params["listen"] = "true" listen = false end fmt_stream = [] of HTTP::Params video.info["url_encoded_fmt_stream_map"].split(",") do |string| fmt_stream << HTTP::Params.parse(string) end fmt_stream.reverse! # We want lowest quality first adaptive_fmts = [] of HTTP::Params video.info["adaptive_fmts"].split(",") do |string| adaptive_fmts << HTTP::Params.parse(string) end related_videos = video.html.xpath_nodes(%q(//li/div/a[contains(@class,"content-link")]/@href)) if related_videos.empty? related_videos = video.html.xpath_nodes(%q(//ytd-compact-video-renderer/div/a/@href)) end related_videos_list = [] of Video related_videos.each do |related_video| related_id = related_video.content.split("=")[1] begin related_videos_list << get_video(related_id) rescue ex p "#{related_id}: #{ex.message}" end end likes = video.html.xpath_node(%q(//button[@title="I like this"]/span)) if likes likes = likes.content.delete(",").to_i else likes = 1 end dislikes = video.html.xpath_node(%q(//button[@title="I dislike this"]/span)) if dislikes dislikes = dislikes.content.delete(",").to_i else dislikes = 1 end description = video.html.xpath_node(%q(//p[@id="eow-description"])) if description description = description.to_xml else description = "" end views = video.info["view_count"].to_i64 rating = video.info["avg_rating"].to_f64 likes = likes.to_f dislikes = dislikes.to_f views = views.to_f engagement = ((dislikes + likes)/views * 100) calculated_rating = (likes/(likes + dislikes) * 4 + 1) templated "watch" end get "/search" do |env| query = URI.escape(env.params.query["q"]) client = HTTP::Client.new("www.youtube.com", 443, CONTEXT) html = client.get("https://www.youtube.com/results?q=#{query}&page=1").body html = XML.parse(html) videos = html.xpath_nodes(%q(//div[@class="style-scope ytd-item-section-renderer"]/ytd-video-renderer)) channels = html.xpath_nodes(%q(//div[@class="style-scope ytd-item-section-renderer"]/ytd-channel-renderer)) if videos.empty? videos = html.xpath_nodes(%q(//div[contains(@class,"yt-lockup-video")]/div/div[contains(@class,"yt-lockup-thumbnail")]/a/@href)) channels = html.xpath_nodes(%q(//div[contains(@class,"yt-lockup-channel")]/div/div[contains(@class,"yt-lockup-thumbnail")]/a/@href)) end videos_list = [] of Video videos.each do |video| id = video.content.split("=")[1] begin videos_list << get_video(id) rescue ex p "#{id}: #{ex.message}" end end templated "search" end error 404 do |env| templated "index" end error 500 do |env| templated "index" end public_folder "assets" Kemal.run