66 lines
1.7 KiB
Crystal
66 lines
1.7 KiB
Crystal
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def fetch_decrypt_function(client, id = "CvFH_6DNRCY")
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document = client.get("/watch?v=#{id}").body
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url = document.match(/src="(?<url>\/yts\/jsbin\/player-.{9}\/en_US\/base.js)"/).not_nil!["url"]
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player = client.get(url).body
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function_name = player.match(/\(b\|\|\(b="signature"\),d.set\(b,(?<name>[a-zA-Z0-9]{2})\(c\)\)\)/).not_nil!["name"]
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function_body = player.match(/#{function_name}=function\(a\){(?<body>[^}]+)}/).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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operations = {} of String => String
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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!
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3.times do |i|
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operation = matches["op#{i + 1}"]
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op_name = operation[0, 2]
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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"
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when "{a.splice(0,b)}"
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operations[op_name] = "b"
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else
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operations[op_name] = "c"
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end
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end
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decrypt_function = [] of {name: String, value: Int32}
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function_body.each do |function|
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function = function.lchop(var_name + ".")
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op_name = function[0, 2]
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function = function.lchop(op_name + "(a,")
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value = function.rchop(")").to_i
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decrypt_function << {name: operations[op_name], value: 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(a, code)
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a = a.split("")
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code.each do |item|
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case item[:name]
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when "a"
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a.reverse!
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when "b"
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a.delete_at(0..(item[:value] - 1))
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when "c"
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a = splice(a, item[:value])
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end
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end
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return a.join("")
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end
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def splice(a, b)
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c = a[0]
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a[0] = a[b % a.size]
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a[b % a.size] = c
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return a
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end
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