invidious/src/invidious.cr

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require "http/client"
require "json"
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require "kemal"
require "pg"
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require "xml"
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require "time"
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PG_DB = DB.open "postgres://kemal:kemal@localhost:5432/invidious"
CONTEXT = OpenSSL::SSL::Context::Client.insecure
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POOL = [] of HTTP::Client
10.times do
POOL << HTTP::Client.new("www.youtube.com", 443, CONTEXT)
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end
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macro templated(filename)
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render "src/views/#{{{filename}}}.ecr", "src/views/layout.ecr"
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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)
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XML.parse_html(rs.read(String))
end
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end
def initialize(id, info, html, updated)
@id = id
@info = info
@html = html
@updated = updated
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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,
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default: XML.parse_html(""),
converter: Video::XMLConverter,
},
updated: Time,
})
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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
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# 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
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def get_client
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while POOL.empty?
sleep rand(0..10).milliseconds
end
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return POOL.pop
end
def fetch_video(id)
# Grab connection from pool
client = get_client
# client = HTTP::Client.new("www.youtube.com", 443, CONTEXT)
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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
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html = XML.parse_html(html)
if info["reason"]?
raise info["reason"]
end
# Return connection to pool
POOL << client
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video = Video.new(id, info, html, Time.now)
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return video
end
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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)
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if refresh && Time.now - video.updated > Time::Span.new(0, 5, 0, 0)
video = fetch_video(id)
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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"]
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listen = env.params.query["listen"]? || "false"
begin
video = get_video(id)
rescue ex
error_message = ex.message
next templated "error"
end
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player_response = JSON.parse(video.info["player_response"])
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fmt_stream = [] of HTTP::Params
video.info["url_encoded_fmt_stream_map"].split(",") do |string|
fmt_stream << HTTP::Params.parse(string)
end
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fmt_stream.reverse! # We want lowest quality first
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adaptive_fmts = [] of HTTP::Params
video.info["adaptive_fmts"].split(",") do |string|
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adaptive_fmts << HTTP::Params.parse(string)
end
likes = video.html.xpath_node(%q(//button[@title="I like this"]/span))
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likes = likes ? likes.content.delete(",").to_i : 1
dislikes = video.html.xpath_node(%q(//button[@title="I dislike this"]/span))
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dislikes = dislikes ? dislikes.content.delete(",").to_i : 1
description = video.html.xpath_node(%q(//p[@id="eow-description"]))
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description = description ? description.to_xml : "Could not load description"
views = video.info["view_count"].to_i64
rating = video.info["avg_rating"].to_f64
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engagement = ((dislikes.to_f + likes.to_f)/views * 100)
calculated_rating = (likes.to_f/(likes.to_f + dislikes.to_f) * 4 + 1)
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rvs = [] of Hash(String, String)
video.info["rvs"].split(",").each do |rv|
rvs << HTTP::Params.parse(rv).to_h
end
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templated "watch"
end
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get "/search" do |env|
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query = env.params.query["q"]
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page = env.params.query["page"]? && env.params.query["page"].to_i? ? env.params.query["page"].to_i : 1
speed = env.params.query["speed"]? && env.params.query["speed"].to_i? ? env.params.query["speed"].to_i : 1
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client = get_client
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html = client.get("https://www.youtube.com/results?q=#{URI.escape(query)}&page=#{page}").body
html = XML.parse_html(html)
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videos = Array(Hash(String, String)).new
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html.xpath_nodes(%q(//div[contains(@class,"yt-lockup-video")]/div)).each do |item|
video = {} of String => String
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link = item.xpath_node(%q(div/div[@class="yt-lockup-content"]/h3/a/@href))
if link
video["link"] = link.content
else
link = item.xpath_node(%q(div[@class="yt-lockup-content"]/h3/a/@href))
if link
video["link"] = link.content
end
end
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title = item.xpath_node(%q(div/div[@class="yt-lockup-content"]/h3/a))
if title
video["title"] = title.content
else
title = item.xpath_node(%q(div[@class="yt-lockup-content"]/h3/a))
if title
video["title"] = title.content
end
end
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videos << video
end
POOL << client
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templated "search"
end
error 404 do |env|
templated "index"
end
error 500 do |env|
templated "index"
end
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public_folder "assets"
Kemal.run