require "http/client" require "json" require "kemal" require "pg" require "time" require "xml" PG_DB = DB.open "postgres://kemal:kemal@localhost:5432/invidious" CONTEXT = OpenSSL::SSL::Context::Client.insecure POOL = [] of HTTP::Client 10.times do POOL << HTTP::Client.new("www.youtube.com", 443, CONTEXT) end 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_html(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_html(""), 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 get_client while POOL.empty? sleep rand(0..10).milliseconds end return POOL.pop end def fetch_video(id) # Grab connection from pool client = get_client # client = HTTP::Client.new("www.youtube.com", 443, CONTEXT) info = client.get("/get_video_info?video_id=#{id}&el=detailpage&ps=default&eurl=&gl=US&hl=en").body info = HTTP::Params.parse(info) html = client.get("/watch?v=#{id}").body html = XML.parse_html(html) if info["reason"]? raise info["reason"] end # Return connection to pool POOL << client video = Video.new(id, info, html, Time.now) return video end def get_video(id, refresh = true) 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 refresh && Time.now - video.updated > Time::Span.new(0, 5, 0, 0) video = fetch_video(id) PG_DB.exec("UPDATE videos SET info = $2, html = $3, updated = $4 WHERE id = $1", video.to_a) 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"] listen = env.params.query["listen"]? || "false" env.params.query.delete_all("listen") begin video = get_video(id) rescue ex error_message = ex.message next templated "error" end player_response = JSON.parse(video.info["player_response"]) 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 likes = video.html.xpath_node(%q(//button[@title="I like this"]/span)) likes = likes ? likes.content.delete(",").to_i : 1 dislikes = video.html.xpath_node(%q(//button[@title="I dislike this"]/span)) dislikes = dislikes ? dislikes.content.delete(",").to_i : 1 description = video.html.xpath_node(%q(//p[@id="eow-description"])) description = description ? description.to_xml : "Could not load description" views = video.info["view_count"].to_i64 rating = video.info["avg_rating"].to_f64 engagement = ((dislikes.to_f + likes.to_f)/views * 100) calculated_rating = (likes.to_f/(likes.to_f + dislikes.to_f) * 4 + 1) rvs = [] of Hash(String, String) video.info["rvs"].split(",").each do |rv| rvs << HTTP::Params.parse(rv).to_h end templated "watch" end get "/search" do |env| query = env.params.query["q"] page = env.params.query["page"]? && env.params.query["page"].to_i? ? env.params.query["page"].to_i : 1 client = get_client html = client.get("https://www.youtube.com/results?q=#{URI.escape(query)}&page=#{page}&sp=EgIQAVAU").body html = XML.parse_html(html) videos = Array(Hash(String, String)).new html.xpath_nodes(%q(//ol[@class="item-section"]/li)).each do |item| root = item.xpath_node(%q(div[contains(@class,"yt-lockup-video")]/div)) if root video = {} of String => String link = root.xpath_node(%q(div[contains(@class,"yt-lockup-thumbnail")]/a/@href)) if link video["link"] = link.content else video["link"] = "#" end title = root.xpath_node(%q(div[@class="yt-lockup-content"]/h3/a)) if title video["title"] = title.content else video["title"] = "Something went wrong" end thumbnail = root.xpath_node(%q(div[contains(@class,"yt-lockup-thumbnail")]/a/div/span/img/@src)) if thumbnail && !thumbnail.content.ends_with?(".gif") video["thumbnail"] = thumbnail.content else thumbnail = root.xpath_node(%q(div[contains(@class,"yt-lockup-thumbnail")]/a/div/span/img/@data-thumb)) if thumbnail video["thumbnail"] = thumbnail.content else video["thumbnail"] = "http://via.placeholder.com/246x138" end end videos << video end end POOL << client templated "search" end error 404 do |env| templated "index" end error 500 do |env| templated "index" end public_folder "assets" Kemal.run