private static void getFuns(VideoInfo SVD)
{
var link = string.Format("https://www.youtube.com{0}", SVD.jsFile);
var _root = WebHelper.GetPageSouce(link);
Debug.SaveFile(_root, "jsfile");
string TryGetDeciphererFuncBody()
{
var funcName = Regex.Match(_root, @"(\w+)=function\(\w+\){(\w+)=\2\.split\(\x22{2}\);.*?return\s+\2\.join\(\x22{2}\)}")
.Groups[0]
.Value;
return(funcName);
}
Debug.SaveFile(TryGetDeciphererFuncBody(), "DeciphererFuncBody");
string TryGetDeciphererDefinitionBody(string body)
{
var objName = Regex.Match(body, "([\\$_\\w]+).\\w+\\(\\w+,\\d+\\);")
.Groups[1]
.Value;
var escapedObjName = Regex.Escape(objName);
return(Regex.Match(_root, $@"var\s+{escapedObjName}=\{{(\w+:function\(\w+(,\w+)?\)\{{(.*?)\}}),?\}};", RegexOptions.Singleline)
.Groups[0]
.Value);
}
Debug.SaveFile(TryGetDeciphererDefinitionBody(TryGetDeciphererFuncBody()), "DeciphererDefinitionBody");
var deciphererFuncBody =
TryGetDeciphererFuncBody();
var deciphererDefinitionBody =
TryGetDeciphererDefinitionBody(deciphererFuncBody);
// Analyze statements to determine cipher function names
foreach (var statement in deciphererFuncBody.Split(";"))
{
// Get the name of the function called in this statement
var calledFuncName = Regex.Match(statement, @"\w+(?:.|\[)(\""?\w+(?:\"")?)\]?\(").Groups[1].Value;
if (string.IsNullOrWhiteSpace(calledFuncName))
{
continue;
}
// Slice
if (Regex.IsMatch(deciphererDefinitionBody, $@"{Regex.Escape(calledFuncName)}:\bfunction\b\([a],b\).(\breturn\b)?.?\w+\."))
{
var index = Regex.Match(statement, @"\(\w+,(\d+)\)").Groups[1].Value;
sol.Add("Splice |" + sol.Count, index);
type.Add("Splice");
tValue.Add(int.Parse(index));
}
// Swap
else if (Regex.IsMatch(deciphererDefinitionBody, $@"{Regex.Escape(calledFuncName)}:\bfunction\b\(\w+\,\w\).\bvar\b.\bc=a\b"))
{
var index = Regex.Match(statement, @"\(\w+,(\d+)\)").Groups[1].Value;
sol.Add("Swap |" + sol.Count, index);
type.Add("Swap");
tValue.Add(int.Parse(index));
}
// Reverse
else if (Regex.IsMatch(deciphererDefinitionBody, $@"{Regex.Escape(calledFuncName)}:\bfunction\b\(\w+\)"))
{
sol.Add("Reverse |" + sol.Count, "null");
type.Add("Reverse");
tValue.Add(-1);
}
}
}
