kevacoin/src/qt/askpassphrasedialog.cpp

#include "askpassphrasedialog.h"
#include "ui_askpassphrasedialog.h"

#include "guiconstants.h"
#include "walletmodel.h"

#include <QMessageBox>
#include <QPushButton>

AskPassphraseDialog::AskPassphraseDialog(Mode mode, QWidget *parent) :
    QDialog(parent),
    ui(new Ui::AskPassphraseDialog),
    mode(mode),
    model(0)
{
    ui->setupUi(this);
    ui->passEdit1->setMaxLength(MAX_PASSPHRASE_SIZE);
    ui->passEdit2->setMaxLength(MAX_PASSPHRASE_SIZE);
    ui->passEdit3->setMaxLength(MAX_PASSPHRASE_SIZE);

    switch(mode)
    {
        case Encrypt: // Ask passphrase x2
            ui->passLabel1->hide();
            ui->passEdit1->hide();
            ui->warningLabel->setText(tr("Enter the new passphrase to the wallet.<br/>Please use a passphrase of <b>10 or more random characters</b>, or <b>eight or more words</b>."));
            setWindowTitle(tr("Encrypt wallet"));
            break;
        case Unlock: // Ask passphrase
            ui->warningLabel->setText(tr("This operation needs your wallet passphrase to unlock the wallet."));
            ui->passLabel2->hide();
            ui->passEdit2->hide();
            ui->passLabel3->hide();
            ui->passEdit3->hide();
            setWindowTitle(tr("Unlock wallet"));
            break;
        case Decrypt:   // Ask passphrase
            ui->warningLabel->setText(tr("This operation needs your wallet passphrase to decrypt the wallet."));
            ui->passLabel2->hide();
            ui->passEdit2->hide();
            ui->passLabel3->hide();
            ui->passEdit3->hide();
            setWindowTitle(tr("Decrypt wallet"));
            break;
        case ChangePass: // Ask old passphrase + new passphrase x2
            setWindowTitle(tr("Change passphrase"));
            ui->warningLabel->setText(tr("Enter the old and new passphrase to the wallet."));
            break;
    }
    resize(minimumSize()); // Get rid of extra space in dialog

    textChanged();
    connect(ui->passEdit1, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
    connect(ui->passEdit2, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
    connect(ui->passEdit3, SIGNAL(textChanged(QString)), this, SLOT(textChanged()));
}

AskPassphraseDialog::~AskPassphraseDialog()
{
    // Attempt to overwrite text so that they do not linger around in memory
    ui->passEdit1->setText(QString(" ").repeated(ui->passEdit1->text().size()));
    ui->passEdit2->setText(QString(" ").repeated(ui->passEdit2->text().size()));
    ui->passEdit3->setText(QString(" ").repeated(ui->passEdit3->text().size()));
    delete ui;
}

void AskPassphraseDialog::setModel(WalletModel *model)
{
    this->model = model;
}

void AskPassphraseDialog::accept()
{
    std::string oldpass, newpass1, newpass2;
    if(!model)
        return;
    // TODO: mlock memory / munlock on return so they will not be swapped out, really need "mlockedstring" wrapper class to do this safely
    oldpass.reserve(MAX_PASSPHRASE_SIZE);
    newpass1.reserve(MAX_PASSPHRASE_SIZE);
    newpass2.reserve(MAX_PASSPHRASE_SIZE);
    oldpass.assign(ui->passEdit1->text().toStdString());
    newpass1.assign(ui->passEdit2->text().toStdString());
    newpass2.assign(ui->passEdit3->text().toStdString());

    switch(mode)
    {
    case Encrypt: {
        if(newpass1.empty() || newpass2.empty())
        {
            // Cannot encrypt with empty passphrase
            break;
        }
        QMessageBox::StandardButton retval = QMessageBox::question(this, tr("Confirm wallet encryption"),
                 tr("WARNING: If you encrypt your wallet and lose your passphrase, you will <b>LOSE ALL OF YOUR BITCOINS</b>!\nAre you sure you wish to encrypt your wallet?"),
                 QMessageBox::Yes|QMessageBox::Cancel,
                 QMessageBox::Cancel);
        if(retval == QMessageBox::Yes)
        {
            if(newpass1 == newpass2)
            {
                if(model->setWalletEncrypted(true, newpass1))
                {
                    QMessageBox::warning(this, tr("Wallet encrypted"),
                                         tr("Remember that encrypting your wallet cannot fully protect your bitcoins from being stolen by malware infecting your computer."));
                }
                else
                {
                    QMessageBox::critical(this, tr("Wallet encryption failed"),
                                         tr("Wallet encryption failed due to an internal error. Your wallet was not encrypted."));
                }
                QDialog::accept(); // Success
            }
            else
            {
                QMessageBox::critical(this, tr("Wallet encryption failed"),
                                     tr("The supplied passphrases do not match."));
            }
        }
        else
        {
            QDialog::reject(); // Cancelled
        }
        } break;
    case Unlock:
        if(!model->setWalletLocked(false, oldpass))
        {
            QMessageBox::critical(this, tr("Wallet unlock failed"),
                                  tr("The passphrase entered for the wallet decryption was incorrect."));
        }
        else
        {
            QDialog::accept(); // Success
        }
        break;
    case Decrypt:
        if(!model->setWalletEncrypted(false, oldpass))
        {
            QMessageBox::critical(this, tr("Wallet decryption failed"),
                                  tr("The passphrase entered for the wallet decryption was incorrect."));
        }
        else
        {
            QDialog::accept(); // Success
        }
        break;
    case ChangePass:
        if(newpass1 == newpass2)
        {
            if(model->changePassphrase(oldpass, newpass1))
            {
                QMessageBox::information(this, tr("Wallet encrypted"),
                                     tr("Wallet passphrase was succesfully changed."));
                QDialog::accept(); // Success
            }
            else
            {
                QMessageBox::critical(this, tr("Wallet encryption failed"),
                                     tr("The passphrase entered for the wallet decryption was incorrect."));
            }
        }
        else
        {
            QMessageBox::critical(this, tr("Wallet encryption failed"),
                                 tr("The supplied passphrases do not match."));
        }
        break;
    }
}

void AskPassphraseDialog::textChanged()
{
    // Validate input, set Ok button to enabled when accepable
    bool acceptable = false;
    switch(mode)
    {
    case Encrypt: // New passphrase x2
        acceptable = !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
        break;
    case Unlock: // Old passphrase x1
    case Decrypt:
        acceptable = !ui->passEdit1->text().isEmpty();
        break;
    case ChangePass: // Old passphrase x1, new passphrase x2
        acceptable = !ui->passEdit1->text().isEmpty() && !ui->passEdit2->text().isEmpty() && !ui->passEdit3->text().isEmpty();
        break;
    }
    ui->buttonBox->button(QDialogButtonBox::Ok)->setEnabled(acceptable);
}