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Fix signature extraction

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This commit is contained in:
Omar Roth 2018-08-28 09:51:59 -05:00
parent 45fa148380
commit 9d5dddab29
1 changed files with 10 additions and 12 deletions
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22
src/invidious/signatures.cr
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@ -4,22 +4,21 @@ def fetch_decrypt_function(client, id = "CvFH_6DNRCY")
player = client.get(url).body
function_name = player.match(/"signature",(?<name>[a-zA-Z0-9]{2})\(/).not_nil!["name"]
function_body = player.match(/#{function_name}=function\(a\){(?<body>[^}]+)}/).not_nil!["body"]
function_body = player.match(/^#{function_name}=function\(a\){(?<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 #{var_name}={(?<body>(.*?))};/).not_nil!["body"]
operations = {} of String => String
matches = player.delete("\n").match(/var #{var_name}={(?<op1>[a-zA-Z0-9]{2}:[^}]+}),(?<op2>[a-zA-Z0-9]{2}:[^}]+}),(?<op3>[a-zA-Z0-9]{2}:[^}]+})};/).not_nil!
3.times do |i|
operation = matches["op#{i + 1}"]
op_name = operation[0, 2]
var_body.split("},").each do |operation|
op_name = operation.match(/^[^:]+/).not_nil![0]
op_body = operation.match(/\{[^}]+/).not_nil![0]
op_body = operation.match(/\{[^}]+\}/).not_nil![0]
case op_body
when "{a.reverse()}"
when "{a.reverse()"
operations[op_name] = "a"
when "{a.splice(0,b)}"
when "{a.splice(0,b)"
operations[op_name] = "b"
else
operations[op_name] = "c"
@ -28,11 +27,10 @@ def fetch_decrypt_function(client, id = "CvFH_6DNRCY")
decrypt_function = [] of {name: String, value: Int32}
function_body.each do |function|
function = function.lchop(var_name + ".")
op_name = function[0, 2]
function = function.lchop(var_name).delete("[].")
function = function.lchop(op_name + "(a,")
value = function.rchop(")").to_i
op_name = function.match(/[^\(]+/).not_nil![0]
value = function.match(/\(a,(?<value>[\d]+)\)/).not_nil!["value"].to_i
decrypt_function << {name: operations[op_name], value: value}
end