invidious/src/invidious.cr

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Crystal
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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
POOL = [] of HTTP::Client
10.times do
POOL << HTTP::Client.new("www.youtube.com", 443, CONTEXT)
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)
XML.parse(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,
default: XML.parse(""),
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
def fetch_video(id)
# Grab connection from pool
client = POOL.pop
# 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
# Return connection to pool
POOL << client
video = Video.new(id, info, html, Time.now)
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"]
begin
video = get_video(id)
rescue ex
error_message = ex.message
next templated "error"
end
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query = HTTP::Params.parse(env.request.query.not_nil!)
if query["listen"]? && query["listen"] == "true"
query.delete_all("listen")
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listen = true
else
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query["listen"] = "true"
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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
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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
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
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related_videos_list << get_video(related_id, false)
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)
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templated "watch"
end
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get "/search" do |env|
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query = env.params.query["q"]
client = POOL.pop
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html = client.get("https://www.youtube.com/results?q=#{URI.escape(query)}&page=1").body
html = XML.parse(html)
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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))
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if videos.empty?
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videos = html.xpath_nodes(%q(//div[contains(@class,"yt-lockup-video")]/div/div[@class="yt-lockup-content"]/h3/a/@href))
channels = html.xpath_nodes(%q(//div[contains(@class,"yt-lockup-channel")]/div[@class="yt-lockup-content"]/h3/a/@href))
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end
videos_list = [] of Video
videos.each do |video|
id = video.content.split("=")[1]
begin
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videos_list << get_video(id, false)
rescue ex
p "#{id}: #{ex.message}"
end
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