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|
require "http/client"
require "json"
require "kemal"
require "pg"
require "xml"
require "time"
macro templated(filename)
render "src/views/#{{{filename}}}.ecr", "src/views/layout.ecr"
end
class Video
getter last_updated : Time
getter video_id : String
getter video_info : String
getter video_html : String
getter views : String
getter likes : Int32
getter dislikes : Int32
getter rating : Float64
getter description : String
def initialize(last_updated, video_id, video_info, video_html, views, likes, dislikes, rating, description)
@last_updated = last_updated
@video_id = video_id
@video_info = video_info
@video_html = video_html
@views = views
@likes = likes
@dislikes = dislikes
@rating = rating
@description = description
end
def to_a
return [@last_updated, @video_id, @video_info, @video_html, @views, @likes, @dislikes, @rating, @description]
end
DB.mapping({
last_updated: Time,
video_id: String,
video_info: String,
video_html: String,
views: Int64,
likes: Int32,
dislikes: Int32,
rating: Float64,
description: String,
})
end
def get_video(video_id, context)
client = HTTP::Client.new("www.youtube.com", 443, context)
video_info = client.get("/get_video_info?video_id=#{video_id}&el=info&ps=default&eurl=&gl=US&hl=en").body
info = HTTP::Params.parse(video_info)
video_html = client.get("/watch?v=#{video_id}").body
html = XML.parse(video_html)
views = info["view_count"].to_i64
rating = info["avg_rating"].to_f64
likes = html.xpath_node(%q(//button[@title="I like this"]/span))
if likes
likes = likes.content.delete(",").to_i
else
likes = 1
end
dislikes = html.xpath_node(%q(//button[@title="I dislike this"]/span))
if dislikes
dislikes = dislikes.content.delete(",").to_i
else
dislikes = 1
end
description = html.xpath_node(%q(//p[@id="eow-description"]))
if description
description = description.to_xml
else
description = ""
end
video_record = Video.new(Time.now, video_id, video_info, video_html, views, likes, dislikes, rating, description)
return video_record
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
get "/" do |env|
templated "index"
end
pg = DB.open "postgres://kemal:kemal@localhost:5432/invidious"
context = OpenSSL::SSL::Context::Client.insecure
get "/watch" do |env|
video_id = env.params.query["v"]
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
if pg.query_one?("select exists (select true from videos where video_id = $1)", video_id, as: Bool)
video_record = pg.query_one("select * from videos where video_id = $1", video_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_record.last_updated > Time::Span.new(0, 5, 0, 0)
video_record = get_video(video_id, context)
pg.exec("update videos set last_updated = $1, video_info = $3, video_html = $4,\
views = $5, likes = $6, dislikes = $7, rating = $8, description = $9 where video_id = $2",
video_record.to_a)
end
else
client = HTTP::Client.new("www.youtube.com", 443, context)
video_info = client.get("/get_video_info?video_id=#{video_id}&el=info&ps=default&eurl=&gl=US&hl=en").body
info = HTTP::Params.parse(video_info)
if info["reason"]?
error_message = info["reason"]
next templated "error"
end
video_record = get_video(video_id, context)
pg.exec("insert into videos values ($1,$2,$3,$4,$5,$6,$7,$8, $9)", video_record.to_a)
end
# last_updated, video_id, video_info, video_html, views, likes, dislikes, rating
video_info = HTTP::Params.parse(video_record.video_info)
video_html = XML.parse(video_record.video_html)
fmt_stream = [] of HTTP::Params
video_info["url_encoded_fmt_stream_map"].split(",") do |string|
fmt_stream << HTTP::Params.parse(string)
end
adaptive_fmts = [] of HTTP::Params
video_info["adaptive_fmts"].split(",") do |string|
adaptive_fmts << HTTP::Params.parse(string)
end
fmt_stream.reverse! # We want lowest quality first
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
likes = video_record.likes.to_f
dislikes = video_record.dislikes.to_f
views = video_record.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)
results_html = client.get("https://www.youtube.com/results?q=#{query}&page=1").body
html = XML.parse(results_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
templated "search"
end
error 404 do |env|
templated "index"
end
error 500 do |env|
templated "index"
end
public_folder "assets"
Kemal.run
|
