OAuth for Evernote using O2 (https://github.com/pipacs/o2) and Qt

EvernoteAuthenticator.h

#ifndef EVERNOTE_AUTHENTICATOR_H
#define EVERNOTE_AUTHENTICATOR_H

#include "o2/o1.h"
#include <QString>

class EvernoteAuthenticator : public O1{

public:
    EvernoteAuthenticator(const QString& host, const QString& customerKey, const QString& customerSecret, QObject *parent = 0){
        this->setRequestTokenUrl(QUrl(host + "/oauth"));
        this->setAuthorizeUrl(QUrl(host + "/OAuth.action"));
        this->setAccessTokenUrl(QUrl(host + "/oauth"));
        this->setClientId(customerKey);
        this->setClientSecret(customerSecret);
    }
};

#endif // EVERNOTE_AUTHENTICATOR_H

EvernoteClient.cpp

#include "EvernoteClient.h"

void EvernoteClient::link()
{
    view = new QWebView();
    connect(evernoteAuthenticator, SIGNAL(openBrowser(QUrl)), this, SLOT(onOpenBrowser(QUrl)));
    connect(evernoteAuthenticator, SIGNAL(closeBrowser()), this, SLOT(onCloseBrowser()));
    connect(evernoteAuthenticator, SIGNAL(linkingSucceeded()), this, SLOT(onLinkingSucceeded()));
    evernoteAuthenticator->link();
}

void EvernoteClient::unLink(){
    evernoteAuthenticator->unlink();
}

EvernoteClient::EvernoteClient(const QString& customerKey, const QString& customerSecret, bool sandbox, QObject *parent) : QObject(parent){
    this->sandbox = sandbox;
    evernoteAuthenticator = new EvernoteAuthenticator(getHost(), customerKey, customerSecret);
}

QString EvernoteClient::getHost() const{
    if(sandbox){
        return "https://sandbox.evernote.com";
    }
    else{
        return "https://www.evernote.com";
    }
}

void EvernoteClient::onLinkingSucceeded(){
    delete view;
    if (!evernoteAuthenticator->linked()) return;
    emit linkingSucceeded();
}

void EvernoteClient::onOpenBrowser(QUrl url){
    std::cerr << "Opening browser " << url.toString().toStdString() << std::endl;
    view->load(url);
    view->show();
}

void EvernoteClient::onCloseBrowser(){
    view->close();
}

EvernoteClient.h

#ifndef EVERNOTECLIENT_H
#define EVERNOTECLIENT_H

/**
 * @brief Class to initialize connection with Evernote. This class
 * is responsible for OAuth
 */

#include <EvernoteAuthenticator.h>
#include <QWebView>
#include <QObject>

class EvernoteClient : public QObject
{
    Q_OBJECT

public:
    explicit EvernoteClient(const QString& customerKey, const QString& customerSecret, bool sandbox = true, QObject *parent = 0);
    ~EvernoteClient(){}

    void link();
    void unLink();

Q_SIGNALS:
    void linkingSucceeded();

public Q_SLOTS:
    void onLinkingSucceeded();
    void onOpenBrowser(QUrl url);
    void onCloseBrowser();

protected:
    QString getHost() const;
    
private:
    bool sandbox;
    EvernoteAuthenticator *evernoteAuthenticator;
    QWebView *view;
};

#endif // EVERNOTECLIENT_H