invidious/src/invidious.cr
2018-03-03 17:45:54 -06:00

350 lines
8.4 KiB
Crystal

# "Invidious" (which indexes popular video sites)
# Copyright (C) 2018 Omar Roth
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
require "kemal"
require "option_parser"
require "pg"
require "xml"
require "./helpers"
threads = 10
sleep_time = 1.0
Kemal.config.extra_options do |parser|
parser.banner = "Usage: invidious [arguments]"
parser.on("-t THREADS", "--threads=THREADS", "Number of threads for crawling (default: 10)") do |number|
begin
threads = number.to_i32
rescue ex
puts "THREADS must be integer"
exit
end
end
parser.on("-w TIME", "--wait=TIME", "Time to wait between server requests in seconds (default: 1 second)") do |number|
begin
sleep_time = number.to_f64
rescue ex
puts "TIME must be integer or float"
exit
end
end
end
Kemal::CLI.new
PG_DB = DB.open "postgres://kemal:kemal@localhost:5432/invidious"
YT_URL = URI.parse("https://www.youtube.com")
CONTEXT = OpenSSL::SSL::Context::Client.new
CONTEXT.verify_mode = OpenSSL::SSL::VerifyMode::NONE
CONTEXT.add_options(
OpenSSL::SSL::Options::ALL |
OpenSSL::SSL::Options::NO_SSL_V2 |
OpenSSL::SSL::Options::NO_SSL_V3
)
youtube_pool = Deque.new((threads * 1.2 + 1).to_i) do
make_client(YT_URL, CONTEXT)
end
reddit_pool = Deque.new((threads * 1.2 + 1).to_i) do
make_client(URI.parse("https://api.reddit.com"), CONTEXT)
end
# Refresh youtube_pool by crawling YT
threads.times do
spawn do
io = STDOUT
ids = Deque(String).new
random = Random.new
yt_client = get_client(youtube_pool)
search(random.base64(3), yt_client) do |id|
ids << id
end
youtube_pool << yt_client
loop do
yt_client = get_client(youtube_pool)
if ids.empty?
search(random.base64(3), yt_client) do |id|
ids << id
end
end
if rand(300) < 1
youtube_pool << make_client(YT_URL, CONTEXT)
yt_client = get_client(youtube_pool)
end
begin
id = ids[0]
video = get_video(id, yt_client, PG_DB)
rescue ex
io << id << " : " << ex.message << "\n"
youtube_pool << make_client(YT_URL, CONTEXT)
next
ensure
ids.delete(id)
end
rvs = [] of Hash(String, String)
if video.info.has_key?("rvs")
video.info["rvs"].split(",").each do |rv|
rvs << HTTP::Params.parse(rv).to_h
end
end
rvs.each do |rv|
if rv.has_key?("id") && !PG_DB.query_one?("SELECT EXISTS (SELECT true FROM videos WHERE id = $1)", rv["id"], as: Bool)
ids.delete(id)
ids << rv["id"]
if ids.size == 150
ids.shift
end
end
end
sleep sleep_time.seconds
youtube_pool << yt_client
end
end
end
threads.times do
spawn do
loop do
client = get_client(reddit_pool)
begin
client.get("/")
rescue ex
STDOUT << "Reddit client : " << ex.message << "\n"
reddit_pool << make_client(URI.parse("https://api.reddit.com"), CONTEXT)
next
end
sleep sleep_time.seconds
reddit_pool << client
end
end
end
top_videos = [] of Video
spawn do
loop do
top = rank_videos(PG_DB, 40)
client = get_client(youtube_pool)
args = [] of String
if top.size > 0
(1..top.size).each { |i| args << "($#{i})," }
args = args.join("")
args = args.chomp(",")
else
next
end
videos = [] of Video
PG_DB.query("SELECT * FROM videos d INNER JOIN (VALUES #{args}) v(id) USING (id)", top) do |rs|
rs.each do
video = rs.read(Video)
videos << video
end
end
top_videos = videos
youtube_pool << client
end
end
macro templated(filename)
render "src/views/#{{{filename}}}.ecr", "src/views/layout.ecr"
end
get "/" do |env|
templated "index"
end
get "/watch" do |env|
if env.params.query["v"]?
id = env.params.query["v"]
else
env.redirect "/"
next
end
listen = false
if env.params.query["listen"]? && env.params.query["listen"] == "true"
listen = true
env.params.query.delete_all("listen")
end
yt_client = get_client(youtube_pool)
begin
video = get_video(id, yt_client, PG_DB)
rescue ex
error_message = ex.message
next templated "error"
ensure
youtube_pool << yt_client
end
fmt_stream = [] of HTTP::Params
video.info["url_encoded_fmt_stream_map"].split(",") do |string|
fmt_stream << HTTP::Params.parse(string)
end
signature = false
if fmt_stream[0]? && fmt_stream[0]["s"]?
signature = true
end
# We want lowest quality first
fmt_stream.reverse!
adaptive_fmts = [] of HTTP::Params
if video.info.has_key?("adaptive_fmts")
video.info["adaptive_fmts"].split(",") do |string|
adaptive_fmts << HTTP::Params.parse(string)
end
end
if signature
adaptive_fmts.each do |fmt|
fmt["url"] += "&signature=" + decrypt_signature(fmt["s"])
end
fmt_stream.each do |fmt|
fmt["url"] += "&signature=" + decrypt_signature(fmt["s"])
end
end
rvs = [] of Hash(String, String)
if video.info.has_key?("rvs")
video.info["rvs"].split(",").each do |rv|
rvs << HTTP::Params.parse(rv).to_h
end
end
player_response = JSON.parse(video.info["player_response"])
rating = video.info["avg_rating"].to_f64
engagement = ((video.dislikes.to_f + video.likes.to_f)/video.views * 100)
if video.likes > 0 || video.dislikes > 0
calculated_rating = (video.likes.to_f/(video.likes.to_f + video.dislikes.to_f) * 4 + 1)
else
calculated_rating = 0.0
end
reddit_client = get_client(reddit_pool)
begin
reddit_comments, reddit_thread = get_reddit_comments(id, reddit_client)
rescue ex
reddit_comments = JSON.parse("[]")
reddit_thread = nil
ensure
reddit_pool << reddit_client
end
templated "watch"
end
get "/search" do |env|
if env.params.query["q"]?
query = env.params.query["q"]
else
env.redirect "/"
next
end
page = env.params.query["page"]? && env.params.query["page"].to_i? ? env.params.query["page"].to_i : 1
client = get_client(youtube_pool)
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
author = root.xpath_node(%q(div[@class="yt-lockup-content"]/div/a))
if author
video["author"] = author.content
video["author_url"] = author["href"]
else
video["author"] = ""
video["author_url"] = ""
end
videos << video
end
end
youtube_pool << client
templated "search"
end
error 404 do |env|
error_message = "404 Page not found"
templated "error"
end
error 500 do |env|
error_message = "500 Server error"
templated "error"
end
public_folder "assets"
Kemal.run