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Videos: Make use of the video decoding

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This commit is contained in:
Samantaz Fox 2024-07-03 18:22:32 +02:00
parent 56a7488161
commit ec8b7916fa
No known key found for this signature in database
GPG Key ID: F42821059186176E
3 changed files with 65 additions and 86 deletions
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1
src/invidious.cr
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@ -163,7 +163,6 @@ if CONFIG.feed_threads > 0
Invidious::Jobs.register Invidious::Jobs::RefreshFeedsJob.new(PG_DB) Invidious::Jobs.register Invidious::Jobs::RefreshFeedsJob.new(PG_DB)
end end
DECRYPT_FUNCTION = DecryptFunction.new(CONFIG.decrypt_polling)
if CONFIG.statistics_enabled if CONFIG.statistics_enabled
Invidious::Jobs.register Invidious::Jobs::StatisticsRefreshJob.new(PG_DB, SOFTWARE) Invidious::Jobs.register Invidious::Jobs::StatisticsRefreshJob.new(PG_DB, SOFTWARE)
end end

81
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 struct Invidious::DecryptFunction
@decrypt_function = [] of {SigProc, Int32} @last_update = Time.monotonic - 42.days
@decrypt_time = Time.monotonic
def initialize(@use_polling = true) def initialize
self.check_update
end end
def update_decrypt_function def check_update
@decrypt_function = fetch_decrypt_function
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 now = Time.monotonic
if now - @decrypt_time > 60.seconds || @decrypt_function.size == 0 if (now - @last_update) > 60.seconds
@decrypt_function = fetch_decrypt_function LOGGER.debug("Signature: Player might be outdated, updating")
@decrypt_time = Time.monotonic Invidious::SigHelper::Client.force_update
@last_update = Time.monotonic
end end
end end
@decrypt_function.each do |proc, value| def decrypt_signature(str : String) : String?
sig = proc.call(sig, value) self.check_update
end return SigHelper::Client.decrypt_sig(str)
rescue ex
return "&#{sp}=#{sig.join("")}" LOGGER.debug(ex.message || "Signature: Unknown error")
LOGGER.trace(ex.inspect_with_backtrace)
return nil
end end
end end

65
src/invidious/videos.cr
View File

@ -1,3 +1,5 @@
private DECRYPT_FUNCTION = IV::DecryptFunction.new
enum VideoType enum VideoType
Video Video
Livestream Livestream
@ -98,20 +100,47 @@ struct Video
# Methods for parsing streaming data # Methods for parsing streaming data
def convert_url(fmt)
if cfr = fmt["signatureCipher"]?.try { |h| HTTP::Params.parse(h.as_s) }
sp = cfr["sp"]
url = URI.parse(cfr["url"])
params = url.query_params
LOGGER.debug("Videos: Decoding '#{cfr}'")
unsig = DECRYPT_FUNCTION.decrypt_signature(cfr["s"])
params[sp] = unsig if unsig
else
url = URI.parse(fmt["url"].as_s)
params = url.query_params
end
n = DECRYPT_FUNCTION.decrypt_nsig(params["n"])
params["n"] = n if n
params["host"] = url.host.not_nil!
if region = self.info["region"]?.try &.as_s
params["region"] = region
end
url.query_params = params
LOGGER.trace("Videos: new url is '#{url}'")
return url.to_s
rescue ex
LOGGER.debug("Videos: Error when parsing video URL")
LOGGER.trace(ex.inspect_with_backtrace)
return ""
end
def fmt_stream def fmt_stream
return @fmt_stream.as(Array(Hash(String, JSON::Any))) if @fmt_stream return @fmt_stream.as(Array(Hash(String, JSON::Any))) if @fmt_stream
fmt_stream = info["streamingData"]?.try &.["formats"]?.try &.as_a.map &.as_h || [] of Hash(String, JSON::Any) fmt_stream = info.dig?("streamingData", "formats")
fmt_stream.each do |fmt| .try &.as_a.map &.as_h || [] of Hash(String, JSON::Any)
if s = (fmt["cipher"]? || fmt["signatureCipher"]?).try { |h| HTTP::Params.parse(h.as_s) }
s.each do |k, v|
fmt[k] = JSON::Any.new(v)
end
fmt["url"] = JSON::Any.new("#{fmt["url"]}#{DECRYPT_FUNCTION.decrypt_signature(fmt)}")
end
fmt["url"] = JSON::Any.new("#{fmt["url"]}&host=#{URI.parse(fmt["url"].as_s).host}") fmt_stream.each do |fmt|
fmt["url"] = JSON::Any.new("#{fmt["url"]}&region=#{self.info["region"]}") if self.info["region"]? fmt["url"] = JSON::Any.new(self.convert_url(fmt))
end end
fmt_stream.sort_by! { |f| f["width"]?.try &.as_i || 0 } fmt_stream.sort_by! { |f| f["width"]?.try &.as_i || 0 }
@ -121,21 +150,17 @@ struct Video
def adaptive_fmts def adaptive_fmts
return @adaptive_fmts.as(Array(Hash(String, JSON::Any))) if @adaptive_fmts return @adaptive_fmts.as(Array(Hash(String, JSON::Any))) if @adaptive_fmts
fmt_stream = info["streamingData"]?.try &.["adaptiveFormats"]?.try &.as_a.map &.as_h || [] of Hash(String, JSON::Any)
fmt_stream.each do |fmt|
if s = (fmt["cipher"]? || fmt["signatureCipher"]?).try { |h| HTTP::Params.parse(h.as_s) }
s.each do |k, v|
fmt[k] = JSON::Any.new(v)
end
fmt["url"] = JSON::Any.new("#{fmt["url"]}#{DECRYPT_FUNCTION.decrypt_signature(fmt)}")
end
fmt["url"] = JSON::Any.new("#{fmt["url"]}&host=#{URI.parse(fmt["url"].as_s).host}") fmt_stream = info.dig("streamingData", "adaptiveFormats")
fmt["url"] = JSON::Any.new("#{fmt["url"]}&region=#{self.info["region"]}") if self.info["region"]? .try &.as_a.map &.as_h || [] of Hash(String, JSON::Any)
fmt_stream.each do |fmt|
fmt["url"] = JSON::Any.new(self.convert_url(fmt))
end end
fmt_stream.sort_by! { |f| f["width"]?.try &.as_i || 0 } fmt_stream.sort_by! { |f| f["width"]?.try &.as_i || 0 }
@adaptive_fmts = fmt_stream @adaptive_fmts = fmt_stream
return @adaptive_fmts.as(Array(Hash(String, JSON::Any))) return @adaptive_fmts.as(Array(Hash(String, JSON::Any)))
end end