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restserver.cpp
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restserver.cpp
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#include "restserver.hh"
#include <QTcpSocket>
#include <QDebug>
#include <QTimer>
#include <QCoreApplication>
#include <QImage>
#include <QBuffer>
#include <QJsonDocument>
#include <QJsonArray>
#include <QJsonObject>
#include <QSettings>
static const int s_serverPort = 8999;
RESTServer::RESTServer(QObject *parent) : QObject(parent), m_serverSocket(new QTcpServer), m_listenPort(s_serverPort),
m_bridgeStatus("ok"), m_streamStatus("ok"), m_videoStatus("ok")
{
m_corners.append(QPoint(0,0));
readSettings();
}
RESTServer::~RESTServer()
{
writeSettings();
stopServer();
delete m_serverSocket;
}
void RESTServer::readSettings()
{
QSettings settings(QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName());
settings.beginGroup("server");
m_listenPort = settings.value("port", s_serverPort).toInt();
settings.endGroup();
}
void RESTServer::writeSettings()
{
QSettings settings(QSettings::UserScope, QCoreApplication::organizationName(), QCoreApplication::applicationName());
settings.beginGroup("server");
settings.setValue("port", m_listenPort);
settings.endGroup();
}
void RESTServer::startServer()
{
m_serverSocket->listen(QHostAddress::Any, m_listenPort);
connect(m_serverSocket, &QTcpServer::newConnection, this, &RESTServer::onNewConnection);
}
void RESTServer::stopServer()
{
if (m_serverSocket->isListening()) {
m_serverSocket->close();
}
}
void RESTServer::onNewConnection()
{
QTcpSocket *clientSocket;
while ((clientSocket = m_serverSocket->nextPendingConnection())!=nullptr) {
connect( clientSocket, &QTcpSocket::readyRead, this, &RESTServer::handleRequest );
connect( clientSocket, &QTcpSocket::disconnected, clientSocket, &QTcpSocket::deleteLater );
}
}
void RESTServer::handleRequest()
{
QTcpSocket *clientSocket = (QTcpSocket *)sender();
QByteArray request = clientSocket->readAll();
// split into header and content
int headerlen = request.indexOf("\r\n\r\n");
if (headerlen < 0) {
qDebug() << "invalid request";
clientSocket->disconnectFromHost();
return;
}
QString header(request.mid(0,headerlen));
QByteArray content = request.mid(headerlen+2);
//qDebug() << header;
QStringList headers = header.split("\r\n");
if (headers.empty()) {
qDebug() << "invalid request";
clientSocket->disconnectFromHost();
return;
}
QStringList reqString = headers[0].split(" ");
if (reqString.size()!=3) {
qDebug() << "invalid request";
clientSocket->disconnectFromHost();
return;
}
QString method, resource, version;
method = reqString[0];
resource = reqString[1];
version = reqString[2];
//qDebug() << "X" << method << resource << version;
if (method == "GET") {
handleGet(clientSocket, resource);
}
if (method == "PUT") {
handlePut(clientSocket, resource, content);
}
clientSocket->disconnectFromHost();
}
void RESTServer::onVideoImage(const QImage &image)
{
m_latestImageJPG.clear();
QBuffer qio(&m_latestImageJPG);
image.save(&qio, "jpg", 10);
}
void RESTServer::onCameraSettingsChanged( const QJsonObject &json )
{
m_cameraSettings = json;
}
void RESTServer::onCornersChanged( const QVector<QPoint> &corners )
{
m_corners = corners;
}
void RESTServer::handleGet(QTcpSocket *socket, const QString &resource)
{
QString mimetype = "application/json";
if (resource == "/") {
QString data = "[]";
send(socket, data.toLatin1(), mimetype);
} else if (resource == "/corners") {
QJsonArray arr;
for (const QPoint &p : qAsConst(m_corners)) {
QJsonObject jp;
jp["x"] = p.x();
jp["y"] = p.y();
arr.append(jp);
}
const QJsonDocument doc( arr );
const QByteArray data = doc.toJson(QJsonDocument::Compact);
send(socket, data, mimetype);
} else if (resource == "/image") {
emit requestImage();
mimetype = "image/jpeg";
if (m_latestImageJPG.isEmpty()) {
QImage img(640,480, QImage::Format_RGB888);
img.fill(0);
QByteArray imagedata;
QBuffer qio(&imagedata);
img.save(&qio, "jpg", 10);
send(socket, imagedata, mimetype);
} else {
send(socket, m_latestImageJPG, mimetype);
}
} else if (resource == "/status") {
QJsonObject obj;
obj["bridge"] = m_bridgeStatus;
obj["stream"] = m_streamStatus;
obj["video"] = m_videoStatus;
obj["camerasettings"] = m_cameraSettings;
const QJsonDocument doc( obj );
const QByteArray data = doc.toJson(QJsonDocument::Compact);
send(socket, data, mimetype);
} else if (resource == "/start") {
const QByteArray data = "{}";
send(socket, data, mimetype);
emit requestStart();
} else if (resource == "/stop") {
const QByteArray data = "{}";
send(socket, data, mimetype);
emit requestStop();
} else if (resource == "/shutdown") {
const QByteArray data = "{}";
send(socket, data, mimetype);
emit requestShutdown();
} else {
sendError(socket);
}
}
void RESTServer::handlePut(QTcpSocket *socket, const QString &resource, const QByteArray &data)
{
// todo validate input!!
if (resource == "/corners") {
QJsonDocument doc = QJsonDocument::fromJson(data);
QVector<QPoint> points;
const QJsonArray arr = doc.array();
for (const QJsonValue &v : arr) {
const QJsonObject o = v.toObject();
QPoint p;
p.setX( o["x"].toInt() );
p.setY( o["y"].toInt() );
points.append(p);
}
const QString mimetype = "application/json";
const QByteArray reply = "{}";
send(socket, reply, mimetype);
emit cornersChanged( points );
if (points.length()==4) {
m_corners = points;
}
} else if (resource == "/camsettings") {
const QJsonDocument doc = QJsonDocument::fromJson(data);
emit cameraSettingsChanged(doc.object());
} else {
sendError(socket);
}
}
void RESTServer::send(QTcpSocket *socket, const QByteArray &data, const QString &mimetype) const
{
QString header = ""
"HTTP/1.1 200 OK\r\n"
"Server: PiEntertain\r\n"
"Content-Length: " + QString::number(data.length()) + "\r\n"
"Connection: close\r\n"
"Cache-Control: no-cache\r\n"
"Vary: Accept-Encoding\r\n"
"Content-Type: " + mimetype + "\r\n\r\n";
QByteArray response = header.toLatin1();
response.append(data);
socket->write(response);
}
void RESTServer::sendError(QTcpSocket *socket) const
{
// todo
Q_UNUSED(socket);
}
void RESTServer::onBridgeStatus(const QString &status, bool err)
{
m_bridgeStatus = (err ? "E " : "S ") + status;
}
void RESTServer::onStreamStatus(const QString &status, bool err)
{
m_streamStatus = (err ? "E " : "S ") + status;
}
void RESTServer::onVideoStatus(const QString &status, bool err)
{
m_videoStatus = (err ? "E " : "S ") + status;
}