Videos: Make use of the video decoding
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Samantaz Fox
parent
56a7488161
commit
ec8b7916fa
3 changed files with 65 additions and 86 deletions
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@ -163,7 +163,6 @@ if CONFIG.feed_threads > 0
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Invidious::Jobs.register Invidious::Jobs::RefreshFeedsJob.new(PG_DB)
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end
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DECRYPT_FUNCTION = DecryptFunction.new(CONFIG.decrypt_polling)
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if CONFIG.statistics_enabled
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Invidious::Jobs.register Invidious::Jobs::StatisticsRefreshJob.new(PG_DB, SOFTWARE)
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end
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@ -1,73 +1,28 @@
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alias SigProc = Proc(Array(String), Int32, Array(String))
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require "http/params"
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require "./sig_helper"
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struct DecryptFunction
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@decrypt_function = [] of {SigProc, Int32}
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@decrypt_time = Time.monotonic
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struct Invidious::DecryptFunction
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@last_update = Time.monotonic - 42.days
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def initialize(@use_polling = true)
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def initialize
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self.check_update
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end
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def update_decrypt_function
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@decrypt_function = fetch_decrypt_function
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def check_update
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now = Time.monotonic
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if (now - @last_update) > 60.seconds
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LOGGER.debug("Signature: Player might be outdated, updating")
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Invidious::SigHelper::Client.force_update
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@last_update = Time.monotonic
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end
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end
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private def fetch_decrypt_function(id = "CvFH_6DNRCY")
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document = YT_POOL.client &.get("/watch?v=#{id}&gl=US&hl=en").body
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url = document.match(/src="(?<url>\/s\/player\/[^\/]+\/player_ias[^\/]+\/en_US\/base.js)"/).not_nil!["url"]
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player = YT_POOL.client &.get(url).body
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function_name = player.match(/^(?<name>[^=]+)=function\(\w\){\w=\w\.split\(""\);[^\. ]+\.[^( ]+/m).not_nil!["name"]
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function_body = player.match(/^#{Regex.escape(function_name)}=function\(\w\){(?<body>[^}]+)}/m).not_nil!["body"]
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function_body = function_body.split(";")[1..-2]
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var_name = function_body[0][0, 2]
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var_body = player.delete("\n").match(/var #{Regex.escape(var_name)}={(?<body>(.*?))};/).not_nil!["body"]
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operations = {} of String => SigProc
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var_body.split("},").each do |operation|
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op_name = operation.match(/^[^:]+/).not_nil![0]
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op_body = operation.match(/\{[^}]+/).not_nil![0]
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case op_body
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when "{a.reverse()"
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operations[op_name] = ->(a : Array(String), _b : Int32) { a.reverse }
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when "{a.splice(0,b)"
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operations[op_name] = ->(a : Array(String), b : Int32) { a.delete_at(0..(b - 1)); a }
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else
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operations[op_name] = ->(a : Array(String), b : Int32) { c = a[0]; a[0] = a[b % a.size]; a[b % a.size] = c; a }
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end
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end
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decrypt_function = [] of {SigProc, Int32}
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function_body.each do |function|
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function = function.lchop(var_name).delete("[].")
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op_name = function.match(/[^\(]+/).not_nil![0]
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value = function.match(/\(\w,(?<value>[\d]+)\)/).not_nil!["value"].to_i
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decrypt_function << {operations[op_name], value}
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end
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return decrypt_function
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end
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def decrypt_signature(fmt : Hash(String, JSON::Any))
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return "" if !fmt["s"]? || !fmt["sp"]?
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sp = fmt["sp"].as_s
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sig = fmt["s"].as_s.split("")
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if !@use_polling
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now = Time.monotonic
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if now - @decrypt_time > 60.seconds || @decrypt_function.size == 0
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@decrypt_function = fetch_decrypt_function
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@decrypt_time = Time.monotonic
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end
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end
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@decrypt_function.each do |proc, value|
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sig = proc.call(sig, value)
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end
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return "&#{sp}=#{sig.join("")}"
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def decrypt_signature(str : String) : String?
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self.check_update
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return SigHelper::Client.decrypt_sig(str)
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rescue ex
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LOGGER.debug(ex.message || "Signature: Unknown error")
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LOGGER.trace(ex.inspect_with_backtrace)
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return nil
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end
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end
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@ -1,3 +1,5 @@
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private DECRYPT_FUNCTION = IV::DecryptFunction.new
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enum VideoType
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Video
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Livestream
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@ -98,20 +100,47 @@ struct Video
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# Methods for parsing streaming data
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def convert_url(fmt)
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if cfr = fmt["signatureCipher"]?.try { |h| HTTP::Params.parse(h.as_s) }
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sp = cfr["sp"]
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url = URI.parse(cfr["url"])
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params = url.query_params
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LOGGER.debug("Videos: Decoding '#{cfr}'")
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unsig = DECRYPT_FUNCTION.decrypt_signature(cfr["s"])
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params[sp] = unsig if unsig
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else
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url = URI.parse(fmt["url"].as_s)
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params = url.query_params
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end
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n = DECRYPT_FUNCTION.decrypt_nsig(params["n"])
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params["n"] = n if n
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params["host"] = url.host.not_nil!
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if region = self.info["region"]?.try &.as_s
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params["region"] = region
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end
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url.query_params = params
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LOGGER.trace("Videos: new url is '#{url}'")
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return url.to_s
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rescue ex
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LOGGER.debug("Videos: Error when parsing video URL")
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LOGGER.trace(ex.inspect_with_backtrace)
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return ""
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end
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def fmt_stream
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return @fmt_stream.as(Array(Hash(String, JSON::Any))) if @fmt_stream
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fmt_stream = info["streamingData"]?.try &.["formats"]?.try &.as_a.map &.as_h || [] of Hash(String, JSON::Any)
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fmt_stream.each do |fmt|
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if s = (fmt["cipher"]? || fmt["signatureCipher"]?).try { |h| HTTP::Params.parse(h.as_s) }
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s.each do |k, v|
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fmt[k] = JSON::Any.new(v)
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end
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fmt["url"] = JSON::Any.new("#{fmt["url"]}#{DECRYPT_FUNCTION.decrypt_signature(fmt)}")
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end
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fmt_stream = info.dig?("streamingData", "formats")
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.try &.as_a.map &.as_h || [] of Hash(String, JSON::Any)
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fmt["url"] = JSON::Any.new("#{fmt["url"]}&host=#{URI.parse(fmt["url"].as_s).host}")
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fmt["url"] = JSON::Any.new("#{fmt["url"]}®ion=#{self.info["region"]}") if self.info["region"]?
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fmt_stream.each do |fmt|
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fmt["url"] = JSON::Any.new(self.convert_url(fmt))
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end
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fmt_stream.sort_by! { |f| f["width"]?.try &.as_i || 0 }
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@ -121,21 +150,17 @@ struct Video
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def adaptive_fmts
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return @adaptive_fmts.as(Array(Hash(String, JSON::Any))) if @adaptive_fmts
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fmt_stream = info["streamingData"]?.try &.["adaptiveFormats"]?.try &.as_a.map &.as_h || [] of Hash(String, JSON::Any)
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fmt_stream.each do |fmt|
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if s = (fmt["cipher"]? || fmt["signatureCipher"]?).try { |h| HTTP::Params.parse(h.as_s) }
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s.each do |k, v|
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fmt[k] = JSON::Any.new(v)
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end
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fmt["url"] = JSON::Any.new("#{fmt["url"]}#{DECRYPT_FUNCTION.decrypt_signature(fmt)}")
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end
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fmt["url"] = JSON::Any.new("#{fmt["url"]}&host=#{URI.parse(fmt["url"].as_s).host}")
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fmt["url"] = JSON::Any.new("#{fmt["url"]}®ion=#{self.info["region"]}") if self.info["region"]?
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fmt_stream = info.dig("streamingData", "adaptiveFormats")
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.try &.as_a.map &.as_h || [] of Hash(String, JSON::Any)
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fmt_stream.each do |fmt|
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fmt["url"] = JSON::Any.new(self.convert_url(fmt))
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end
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fmt_stream.sort_by! { |f| f["width"]?.try &.as_i || 0 }
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@adaptive_fmts = fmt_stream
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return @adaptive_fmts.as(Array(Hash(String, JSON::Any)))
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end
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