SsoSession and Connection::prepareForSso()

The response in the web browser is quite barebone, just enough
to give feedback that things are alright. Closes #386. Closes #388.

1 files changed, 127 insertions, 0 deletions

diff --git a/lib/ssosession.cpp b/lib/ssosession.cpp
new file mode 100644
index 00000000..0f8f96e1
--- /dev/null
+++ b/lib/ssosession.cpp
@@ -0,0 +1,127 @@
+#include "ssosession.h"
+
+#include "connection.h"
+#include "csapi/sso_login_redirect.h"
+
+#include <QtNetwork/QTcpServer>
+#include <QtNetwork/QTcpSocket>
+#include <QtCore/QCoreApplication>
+#include <QtCore/QStringBuilder>
+
+using namespace Quotient;
+
+struct SsoSession::Private {
+    Private(SsoSession* q, const QString& initialDeviceName = {},
+            const QString& deviceId = {}, Connection* connection = nullptr)
+        : initialDeviceName(initialDeviceName)
+        , deviceId(deviceId)
+        , connection(connection)
+    {
+        auto* server = new QTcpServer(q);
+        server->listen();
+        // The "/returnToApplication" part is just a hint for the end-user,
+        // the callback will work without it equally well.
+        callbackUrl = QStringLiteral("http://localhost:%1/returnToApplication")
+                          .arg(server->serverPort());
+        ssoUrl = connection->getUrlForApi<RedirectToSSOJob>(callbackUrl);
+
+        QObject::connect(server, &QTcpServer::newConnection, q, [this, server] {
+            qCDebug(MAIN) << "SSO callback initiated";
+            socket = server->nextPendingConnection();
+            server->close();
+            QObject::connect(socket, &QTcpSocket::readyRead, socket, [this] {
+                requestData.append(socket->readAll());
+                if (!socket->atEnd() && !requestData.endsWith("\r\n\r\n")) {
+                    qDebug(MAIN) << "Incomplete request, waiting for more data";
+                    return;
+                }
+                processCallback();
+            });
+            QObject::connect(socket, &QTcpSocket::disconnected, socket,
+                             [this] { socket->deleteLater(); });
+        });
+    }
+    void processCallback();
+    void sendHttpResponse(const QByteArray& code, const QByteArray& msg);
+    void onError(const QByteArray& code, const QString& errorMsg);
+
+    QString initialDeviceName;
+    QString deviceId;
+    Connection* connection;
+    QString callbackUrl {};
+    QUrl ssoUrl {};
+    QTcpSocket* socket = nullptr;
+    QByteArray requestData {};
+};
+
+SsoSession::SsoSession(Connection* connection, const QString& initialDeviceName,
+                       const QString& deviceId)
+    : QObject(connection)
+    , d(std::make_unique<Private>(this, initialDeviceName, deviceId, connection))
+{
+    qCDebug(MAIN) << "SSO session constructed";
+}
+
+SsoSession::~SsoSession()
+{
+    qCDebug(MAIN) << "SSO session deconstructed";
+}
+
+QUrl SsoSession::ssoUrl() const { return d->ssoUrl; }
+
+QUrl SsoSession::callbackUrl() const { return d->callbackUrl; }
+
+void SsoSession::Private::processCallback()
+{
+    // https://matrix.org/docs/guides/sso-for-client-developers
+    // Inspired by Clementine's src/internet/core/localredirectserver.cpp
+    // (see at https://github.com/clementine-player/Clementine/)
+    const auto& requestParts = requestData.split(' ');
+    if (requestParts.size() < 2 || requestParts[1].isEmpty()) {
+        onError("400 Bad Request", tr("No login token in SSO callback"));
+        return;
+    }
+    const auto& QueryItemName = QStringLiteral("loginToken");
+    QUrlQuery query { QUrl(requestParts[1]).query() };
+    if (!query.hasQueryItem(QueryItemName)) {
+        onError("400 Bad Request", tr("Malformed single sign-on callback"));
+    }
+    qCDebug(MAIN) << "Found the token in SSO callback, logging in";
+    connection->loginWithToken(query.queryItemValue(QueryItemName).toLatin1(),
+                               initialDeviceName, deviceId);
+    connect(connection, &Connection::connected, socket, [this] {
+        const QString msg =
+            "The application '" % QCoreApplication::applicationName()
+            % "' has successfully logged in as a user " % connection->userId()
+            % " with device id " % connection->deviceId()
+            % ". This window can be closed. Thank you.\r\n";
+        sendHttpResponse("200 OK", msg.toHtmlEscaped().toUtf8());
+        socket->disconnectFromHost();
+    });
+    connect(connection, &Connection::loginError, socket, [this] {
+        onError("401 Unauthorised", tr("Login failed"));
+        socket->disconnectFromHost();
+    });
+}
+
+void SsoSession::Private::sendHttpResponse(const QByteArray& code,
+                                           const QByteArray& msg)
+{
+    socket->write("HTTP/1.0 ");
+    socket->write(code);
+    socket->write("\r\n"
+                  "Content-type: text/html;charset=UTF-8\r\n"
+                  "\r\n\r\n");
+    socket->write(msg);
+    socket->write("\r\n");
+}
+
+void SsoSession::Private::onError(const QByteArray& code,
+                                  const QString& errorMsg)
+{
+    qCWarning(MAIN).nospace() << errorMsg;
+    sendHttpResponse(code, "<h3>" + errorMsg.toUtf8() + "</h3>");
+    // [kitsune] Yeah, I know, dirty. Maybe the "right" way would be to have
+    // an intermediate signal but that seems just a fight for purity.
+    emit connection->loginError(errorMsg, requestData);
+}