public static async Task <bool> IsValidUrl(string url)
{
if (!Regex.IsMatch(url, NomalizedPattern))
{
return(false);
}
var hp = new HttpHelper();
string html = null;
if (!NetCache.HasCache(url))
{
html = await hp.GET(url, encoding : Encoding.UTF8);
NetCache.Set(url, html);
}
else
{
html = NetCache.Get(url);
}
if (!html.IsEmpty(true) && Regex.IsMatch(html, TitlePattern))
{
return(!Regex.Match(html, TitlePattern).Groups[1].Value.AnyEquals("Youtube"));
}
return(false);
}
public static async Task <VideoData[]> Extract(string url)
{
string vUrl;
if (UrlResolver.TryNomalize(url, out vUrl))
{
string html;
if (!await UrlResolver.IsValidUrl(vUrl))
{
throw new InvalidUrlException();
}
// 캐싱
if (NetCache.HasCache(vUrl))
{
html = NetCache.Get(vUrl);
}
else
{
var hp = new HttpHelper();
html = await hp.GET(vUrl);
NetCache.Set(vUrl, html);
}
// 정지된 유튜브 체크
if (IsVideoUnavailable(html))
{
throw new UnableVideoException();
}
// 스트림및 영상 데이터
var obj = JObject.Parse(ParseVideoData(html));
return(await ParseDownloadUrls(obj));
}
else
{
throw new InvalidUrlException();
}
}
public static async Task <string> Decrypt(string cipher, string jsUrl)
{
string js;
if (NetCache.HasCache(jsUrl))
{
js = NetCache.Get(jsUrl);
}
else
{
js = await(new HttpHelper()).GET(jsUrl);
NetCache.Set(jsUrl, js);
}
string functNamePattern = @"\.sig\s*\|\|([a-zA-Z0-9\$]+)\(";
var funcName = Regex.Match(js, functNamePattern).Groups[1].Value;
if (funcName.Contains("$"))
{
funcName = "\\" + funcName;
}
string funcPattern = @"(?!h\.)" + @funcName + @"=function\(\w+\)\{.*?\}";
var funcBody = Regex.Match(js, funcPattern, RegexOptions.Singleline).Value;
var lines = funcBody.Split(';');
string idReverse = "", idSlice = "", idCharSwap = "";
string functionIdentifier = "";
string operations = "";
foreach (var line in lines.Skip(1).Take(lines.Length - 2))
{
if (!string.IsNullOrEmpty(idReverse) && !string.IsNullOrEmpty(idSlice) &&
!string.IsNullOrEmpty(idCharSwap))
{
break;
}
functionIdentifier = GetFunctionFromLine(line);
string reReverse = string.Format(@"{0}:\bfunction\b\(\w+\)", functionIdentifier);
string reSlice = string.Format(@"{0}:\bfunction\b\([a],b\).(\breturn\b)?.?\w+\.", functionIdentifier);
string reSwap = string.Format(@"{0}:\bfunction\b\(\w+\,\w\).\bvar\b.\bc=a\b", functionIdentifier);
if (Regex.Match(js, reReverse).Success)
{
idReverse = functionIdentifier;
}
if (Regex.Match(js, reSlice).Success)
{
idSlice = functionIdentifier;
}
if (Regex.Match(js, reSwap).Success)
{
idCharSwap = functionIdentifier;
}
}
foreach (var line in lines.Skip(1).Take(lines.Length - 2))
{
Match m;
functionIdentifier = GetFunctionFromLine(line);
if ((m = Regex.Match(line, @"\(\w+,(?<index>\d+)\)")).Success && functionIdentifier == idCharSwap)
{
operations += "w" + m.Groups["index"].Value + " ";
}
if ((m = Regex.Match(line, @"\(\w+,(?<index>\d+)\)")).Success && functionIdentifier == idSlice)
{
operations += "s" + m.Groups["index"].Value + " ";
}
if (functionIdentifier == idReverse)
{
operations += "r ";
}
}
operations = operations.Trim();
return(DecipherWithOperations(cipher, operations));
}