Add PasswordGenerator backend.

Refs #52

src/core/PasswordGenerator.h

@@ -0,0 +1,75 @@
+/*
+ *  Copyright (C) 2013 Felix Geyer <debfx@fobos.de>
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 2 or (at your option)
+ *  version 3 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef KEEPASSX_PASSWORDGENERATOR_H
+#define KEEPASSX_PASSWORDGENERATOR_H
+
+#include <QtCore/QFlags>
+#include <QtCore/QString>
+#include <QtCore/QVector>
+
+#include "core/Global.h"
+
+typedef QVector<QChar> PasswordGroup;
+
+class PasswordGenerator
+{
+public:
+    enum CharClass
+    {
+        LowerLetters      = 0x1,
+        UpperLetters      = 0x2,
+        Numbers           = 0x4,
+        SpecialCharacters = 0x8
+    };
+    Q_DECLARE_FLAGS(CharClasses, CharClass)
+
+    enum GeneratorFlag
+    {
+        ExcludeLookAlike   = 0x1,
+        CharFromEveryGroup = 0x2
+    };
+    Q_DECLARE_FLAGS(GeneratorFlags, GeneratorFlag)
+
+    QString generatePassword(int length, const PasswordGenerator::CharClasses& classes,
+                             const PasswordGenerator::GeneratorFlags& flags);
+    bool isValidCombination(int length, const PasswordGenerator::CharClasses& classes,
+                            const PasswordGenerator::GeneratorFlags& flags);
+
+    static PasswordGenerator* instance();
+
+private:
+    PasswordGenerator();
+
+    QVector<PasswordGroup> passwordGroups(const PasswordGenerator::CharClasses& classes,
+                                          const PasswordGenerator::GeneratorFlags& flags);
+    int numCharClasses(const PasswordGenerator::CharClasses& classes);
+
+    static PasswordGenerator* m_instance;
+
+    Q_DISABLE_COPY(PasswordGenerator)
+};
+
+inline PasswordGenerator* passwordGenerator() {
+    return PasswordGenerator::instance();
+}
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(PasswordGenerator::CharClasses)
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(PasswordGenerator::GeneratorFlags)
+
+#endif // KEEPASSX_PASSWORDGENERATOR_H