From: Flavio <flavio@odisseo.local>
Date: Tue, 17 Dec 2013 09:38:21 +0000 (+0100)
Subject: Better signature decrypting
X-Git-Tag: 2.1.5~4
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=235d79b222907a674105f25e5a50e17b4b1a5930;p=minitube

Better signature decrypting
---

diff --git a/src/diskcache.cpp b/src/diskcache.cpp
index 36234d1..f9d0391 100644
--- a/src/diskcache.cpp
+++ b/src/diskcache.cpp
@@ -33,7 +33,8 @@ QIODevice* DiskCache::prepare(const QNetworkCacheMetaData &metaData) {
         }
     }
 
-    if (mime.startsWith(QLatin1String("image/")))
+    if (mime.startsWith(QLatin1String("image/")) ||
+                        mime.endsWith(QLatin1String("/javascript")))
         return QNetworkDiskCache::prepare(metaData);
 
     return 0;
diff --git a/src/video.cpp b/src/video.cpp
index 8cb1f97..11fe11a 100644
--- a/src/video.cpp
+++ b/src/video.cpp
@@ -183,7 +183,7 @@ void  Video::gotVideoInfo(QByteArray data) {
     parseFmtUrlMap(fmtUrlMap);
 }
 
-void Video::parseFmtUrlMap(QString fmtUrlMap, bool fromWebPage) {
+void Video::parseFmtUrlMap(const QString &fmtUrlMap, bool fromWebPage) {
     QSettings settings;
     QString definitionName = settings.value("definition", "360p").toString();
     int definitionCode = VideoDefinition::getDefinitionCode(definitionName);
@@ -200,10 +200,12 @@ void Video::parseFmtUrlMap(QString fmtUrlMap, bool fromWebPage) {
         QString url;
         QString sig;
         foreach(QString urlParam, urlParams) {
-            // qDebug() << urlParam;
+            // qWarning() << urlParam;
             if (urlParam.startsWith("itag=")) {
                 int separator = urlParam.indexOf("=");
                 format = urlParam.mid(separator + 1).toInt();
+                qWarning() << "itag" << format;
+
             } else if (urlParam.startsWith("url=")) {
                 int separator = urlParam.indexOf("=");
                 url = urlParam.mid(separator + 1);
@@ -219,8 +221,11 @@ void Video::parseFmtUrlMap(QString fmtUrlMap, bool fromWebPage) {
                     sig = QByteArray::fromPercentEncoding(sig.toUtf8());
                     if (ageGate)
                         sig = JsFunctions::instance()->decryptAgeSignature(sig);
-                    else
-                        sig = JsFunctions::instance()->decryptSignature(sig);
+                    else {
+                        sig = decryptSignature(sig);
+                        if (sig.isEmpty())
+                            sig = JsFunctions::instance()->decryptSignature(sig);
+                    }
                 } else {
                     // qDebug() << "Loading webpage";
                     QUrl url("http://www.youtube.com/watch");
@@ -246,7 +251,7 @@ void Video::parseFmtUrlMap(QString fmtUrlMap, bool fromWebPage) {
         // qWarning() << url;
 
         if (format == definitionCode) {
-            // qDebug() << "Found format" << definitionCode;
+            qDebug() << "Found format" << definitionCode;
             QUrl videoUrl = QUrl::fromEncoded(url.toUtf8(), QUrl::StrictMode);
             m_streamUrl = videoUrl;
             this->definitionCode = definitionCode;
@@ -266,7 +271,7 @@ void Video::parseFmtUrlMap(QString fmtUrlMap, bool fromWebPage) {
         if (previousIndex < 0) previousIndex = 0;
         int definitionCode = definitionCodes.at(previousIndex);
         if (urlMap.contains(definitionCode)) {
-            // qDebug() << "Found format" << definitionCode;
+            qDebug() << "Found format" << definitionCode;
             QString url = urlMap.value(definitionCode);
             QUrl videoUrl = QUrl::fromEncoded(url.toUtf8(), QUrl::StrictMode);
             m_streamUrl = videoUrl;
@@ -321,9 +326,25 @@ void Video::scrapeWebPage(QByteArray data) {
         getVideoInfo();
         return;
     }
-    QString fmtUrlMap = re.cap(1);
+    fmtUrlMap = re.cap(1);
     fmtUrlMap.replace("\\u0026", "&");
-    parseFmtUrlMap(fmtUrlMap, true);
+    // parseFmtUrlMap(fmtUrlMap, true);
+
+    QRegExp jsPlayerRe("\"assets\":.+\"js\":\\s*\"([^\"]+)\"");
+    if (jsPlayerRe.indexIn(html) != -1) {
+        QString jsPlayerUrl = jsPlayerRe.cap(1);
+        jsPlayerUrl.remove('\\');
+        jsPlayerUrl = "http:" + jsPlayerUrl;
+        qWarning() << "jsPlayerUrl" << jsPlayerUrl;
+        /*
+        QRegExp jsPlayerIdRe("-(.+)\\.js");
+        jsPlayerIdRe.indexIn(jsPlayerUrl);
+        QString jsPlayerId = jsPlayerRe.cap(1);
+        */
+        QObject *reply = The::http()->get(jsPlayerUrl);
+        connect(reply, SIGNAL(data(QByteArray)), SLOT(parseJsPlayer(QByteArray)));
+        connect(reply, SIGNAL(error(QNetworkReply*)), SLOT(errorVideoInfo(QNetworkReply*)));
+    }
 }
 
 void Video::gotHeadHeaders(QNetworkReply* reply) {
@@ -369,6 +390,60 @@ void Video::gotHeadHeaders(QNetworkReply* reply) {
     }
 }
 
+void Video::parseJsPlayer(QByteArray bytes) {
+    QString js = QString::fromUtf8(bytes);
+
+    QRegExp funcNameRe("signature=([a-zA-Z0-9]+)");
+    if (funcNameRe.indexIn(js) == -1) {
+        qWarning() << "Cannot capture signature function name";
+        return;
+    }
+    sigFuncName = funcNameRe.cap(1);
+    captureFunction(sigFuncName, js);
+    qWarning() << sigFunctions;
+    parseFmtUrlMap(fmtUrlMap, true);
+}
+
+void Video::captureFunction(const QString &name, const QString &js) {
+    QRegExp funcRe("function\\s+" + name + "\\s*\\([a-zA-Z0-9,\\s]*\\)\\s*\\{[^\\}]+\\}");
+    if (funcRe.indexIn(js) == -1) {
+        qWarning() << "Cannot capture function" << name;
+        return;
+    }
+    QString func = funcRe.cap(0);
+    sigFunctions.insert(name, func);
+
+    // capture inner functions
+    QRegExp invokedFuncRe("[\\s=;\\(]([a-zA-Z0-9]+)\\s*\\([a-zA-Z0-9, ]+\\)");
+    int pos = name.length() + 9;
+    while ((pos = invokedFuncRe.indexIn(func, pos)) != -1) {
+        QString funcName = invokedFuncRe.cap(1);
+        if (!sigFunctions.contains(funcName))
+            captureFunction(funcName, js);
+        pos += invokedFuncRe.matchedLength();
+    }
+}
+
+QString Video::decryptSignature(const QString &s) {
+    QScriptEngine engine;
+    foreach (QString f, sigFunctions.values()) {
+        QScriptValue value = engine.evaluate(f);
+        if (value.isError())
+            qWarning() << "Error in" << f << value.toString();
+    }
+    QString js = sigFuncName + "('" + s + "');";
+    QScriptValue value = engine.evaluate(js);
+    if (value.isUndefined()) {
+        qWarning() << "Undefined result for" << js;
+        return QString();
+    }
+    if (value.isError()) {
+        qWarning() << "Error in" << js << value.toString();
+        return QString();
+    }
+    return value.toString();
+}
+
 void Video::findVideoUrl(int definitionCode) {
     this->definitionCode = definitionCode;
 
@@ -381,7 +456,6 @@ void Video::findVideoUrl(int definitionCode) {
     // connect(reply, SIGNAL(error(QNetworkReply*)), SLOT(errorVideoInfo(QNetworkReply*)));
 
     // see you in gotHeadHeaders()
-
 }
 
 QString Video::formattedDuration() const {
diff --git a/src/video.h b/src/video.h
index 76a9f58..7220a4d 100644
--- a/src/video.h
+++ b/src/video.h
@@ -95,12 +95,15 @@ private slots:
     void errorVideoInfo(QNetworkReply*);
     void scrapeWebPage(QByteArray);
     void gotHeadHeaders(QNetworkReply*);
+    void parseJsPlayer(QByteArray);
 
 private:
     void getVideoInfo();
     void findVideoUrl(int definitionCode);
     void foundVideoUrl(QString videoToken, int definitionCode);
-    void parseFmtUrlMap(QString fmtUrlMap, bool fromWebPage = false);
+    void parseFmtUrlMap(const QString &fmtUrlMap, bool fromWebPage = false);
+    void captureFunction(const QString &name, const QString &js);
+    QString decryptSignature(const QString &s);
 
     QString m_title;
     QString m_description;
@@ -126,6 +129,10 @@ private:
     
     bool loadingStreamUrl;
     bool loadingThumbnail;
+
+    QHash<QString, QString> sigFunctions;
+    QString sigFuncName;
+    QString fmtUrlMap;
 };
 
 // This is required in order to use QPointer<Video> as a QVariant