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Videos: Make use of the video decoding

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Samantaz Fox
2024-07-03 18:22:32 +02:00
parent 56a7488161
commit ec8b7916fa
3 changed files with 65 additions and 86 deletions
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85
src/invidious/helpers/signatures.cr
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@@ -1,73 +1,28 @@
alias SigProc = Proc(Array(String), Int32, Array(String))
require "http/params"
require "./sig_helper"
struct DecryptFunction
@decrypt_function = [] of {SigProc, Int32}
@decrypt_time = Time.monotonic
struct Invidious::DecryptFunction
@last_update = Time.monotonic - 42.days
def initialize(@use_polling = true)
def initialize
self.check_update
end
def update_decrypt_function
@decrypt_function = fetch_decrypt_function
def check_update
now = Time.monotonic
if (now - @last_update) > 60.seconds
LOGGER.debug("Signature: Player might be outdated, updating")
Invidious::SigHelper::Client.force_update
@last_update = Time.monotonic
end
end
private def fetch_decrypt_function(id = "CvFH_6DNRCY")
document = YT_POOL.client &.get("/watch?v=#{id}&gl=US&hl=en").body
url = document.match(/src="(?<url>\/s\/player\/[^\/]+\/player_ias[^\/]+\/en_US\/base.js)"/).not_nil!["url"]
player = YT_POOL.client &.get(url).body
function_name = player.match(/^(?<name>[^=]+)=function\(\w\){\w=\w\.split\(""\);[^\. ]+\.[^( ]+/m).not_nil!["name"]
function_body = player.match(/^#{Regex.escape(function_name)}=function\(\w\){(?<body>[^}]+)}/m).not_nil!["body"]
function_body = function_body.split(";")[1..-2]
var_name = function_body[0][0, 2]
var_body = player.delete("\n").match(/var #{Regex.escape(var_name)}={(?<body>(.*?))};/).not_nil!["body"]
operations = {} of String => SigProc
var_body.split("},").each do |operation|
op_name = operation.match(/^[^:]+/).not_nil![0]
op_body = operation.match(/\{[^}]+/).not_nil![0]
case op_body
when "{a.reverse()"
operations[op_name] = ->(a : Array(String), _b : Int32) { a.reverse }
when "{a.splice(0,b)"
operations[op_name] = ->(a : Array(String), b : Int32) { a.delete_at(0..(b - 1)); a }
else
operations[op_name] = ->(a : Array(String), b : Int32) { c = a[0]; a[0] = a[b % a.size]; a[b % a.size] = c; a }
end
end
decrypt_function = [] of {SigProc, Int32}
function_body.each do |function|
function = function.lchop(var_name).delete("[].")
op_name = function.match(/[^\(]+/).not_nil![0]
value = function.match(/\(\w,(?<value>[\d]+)\)/).not_nil!["value"].to_i
decrypt_function << {operations[op_name], value}
end
return decrypt_function
end
def decrypt_signature(fmt : Hash(String, JSON::Any))
return "" if !fmt["s"]? || !fmt["sp"]?
sp = fmt["sp"].as_s
sig = fmt["s"].as_s.split("")
if !@use_polling
now = Time.monotonic
if now - @decrypt_time > 60.seconds || @decrypt_function.size == 0
@decrypt_function = fetch_decrypt_function
@decrypt_time = Time.monotonic
end
end
@decrypt_function.each do |proc, value|
sig = proc.call(sig, value)
end
return "&#{sp}=#{sig.join("")}"
def decrypt_signature(str : String) : String?
self.check_update
return SigHelper::Client.decrypt_sig(str)
rescue ex
LOGGER.debug(ex.message || "Signature: Unknown error")
LOGGER.trace(ex.inspect_with_backtrace)
return nil
end
end