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Merge pull request #1389 from vhuynh3000/decrypt_on_demand

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add config to decrypt on demand instead of polling
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Perflyst 2021-01-05 19:32:22 +01:00 committed by GitHub
commit 2c24bf3222
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5 changed files with 74 additions and 51 deletions
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8
src/invidious.cr
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@ -168,7 +168,11 @@ end
Invidious::Jobs.register Invidious::Jobs::RefreshChannelsJob.new(PG_DB, logger, config)
Invidious::Jobs.register Invidious::Jobs::RefreshFeedsJob.new(PG_DB, logger, config)
Invidious::Jobs.register Invidious::Jobs::SubscribeToFeedsJob.new(PG_DB, logger, config, HMAC_KEY)
Invidious::Jobs.register Invidious::Jobs::UpdateDecryptFunctionJob.new
DECRYPT_FUNCTION = DecryptFunction.new(CONFIG.decrypt_polling)
if config.decrypt_polling
Invidious::Jobs.register Invidious::Jobs::UpdateDecryptFunctionJob.new(logger)
end
if config.statistics_enabled
Invidious::Jobs.register Invidious::Jobs::StatisticsRefreshJob.new(PG_DB, config, SOFTWARE)
@ -191,8 +195,6 @@ def popular_videos
Invidious::Jobs::PullPopularVideosJob::POPULAR_VIDEOS.get
end
DECRYPT_FUNCTION = Invidious::Jobs::UpdateDecryptFunctionJob::DECRYPT_FUNCTION
before_all do |env|
preferences = begin
Preferences.from_json(env.request.cookies["PREFS"]?.try &.value || "{}")

1
src/invidious/helpers/helpers.cr
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@ -67,6 +67,7 @@ class Config
property channel_threads : Int32 # Number of threads to use for crawling videos from channels (for updating subscriptions)
property feed_threads : Int32 # Number of threads to use for updating feeds
property db : DBConfig # Database configuration
property decrypt_polling : Bool = true # Use polling to keep decryption function up to date
property full_refresh : Bool # Used for crawling channels: threads should check all videos uploaded by a channel
property https_only : Bool? # Used to tell Invidious it is behind a proxy, so links to resources should be https://
property hmac_key : String? # HMAC signing key for CSRF tokens and verifying pubsub subscriptions

100
src/invidious/helpers/signatures.cr
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@ -1,53 +1,73 @@
alias SigProc = Proc(Array(String), Int32, Array(String))
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
struct DecryptFunction
@decrypt_function = [] of {SigProc, Int32}
@decrypt_time = Time.monotonic
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]
def initialize(@use_polling = true)
end
var_name = function_body[0][0, 2]
var_body = player.delete("\n").match(/var #{Regex.escape(var_name)}={(?<body>(.*?))};/).not_nil!["body"]
def update_decrypt_function
@decrypt_function = fetch_decrypt_function
end
operations = {} of String => SigProc
var_body.split("},").each do |operation|
op_name = operation.match(/^[^:]+/).not_nil![0]
op_body = operation.match(/\{[^}]+/).not_nil![0]
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
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 }
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
decrypt_function = [] of {SigProc, Int32}
function_body.each do |function|
function = function.lchop(var_name).delete("[].")
def decrypt_signature(fmt : Hash(String, JSON::Any))
return "" if !fmt["s"]? || !fmt["sp"]?
op_name = function.match(/[^\(]+/).not_nil![0]
value = function.match(/\(\w,(?<value>[\d]+)\)/).not_nil!["value"].to_i
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 << {operations[op_name], value}
@decrypt_function.each do |proc, value|
sig = proc.call(sig, value)
end
return "&#{sp}=#{sig.join("")}"
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("")
DECRYPT_FUNCTION.each do |proc, value|
sig = proc.call(sig, value)
end
return "&#{sp}=#{sig.join("")}"
end

12
src/invidious/jobs/update_decrypt_function_job.cr
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@ -1,15 +1,15 @@
class Invidious::Jobs::UpdateDecryptFunctionJob < Invidious::Jobs::BaseJob
DECRYPT_FUNCTION = [] of {SigProc, Int32}
private getter logger : Invidious::LogHandler
def initialize(@logger)
end
def begin
loop do
begin
decrypt_function = fetch_decrypt_function
DECRYPT_FUNCTION.clear
decrypt_function.each { |df| DECRYPT_FUNCTION << df }
DECRYPT_FUNCTION.update_decrypt_function
rescue ex
# TODO: Log error
next
logger.error("UpdateDecryptFunctionJob : #{ex.message}")
ensure
sleep 1.minute
Fiber.yield

4
src/invidious/videos.cr
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@ -580,7 +580,7 @@ struct Video
s.each do |k, v|
fmt[k] = JSON::Any.new(v)
end
fmt["url"] = JSON::Any.new("#{fmt["url"]}#{decrypt_signature(fmt)}")
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}")
@ -599,7 +599,7 @@ struct Video
s.each do |k, v|
fmt[k] = JSON::Any.new(v)
end
fmt["url"] = JSON::Any.new("#{fmt["url"]}#{decrypt_signature(fmt)}")
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}")