Add simple HTTP server

http/httpsocket.cpp

@@ -0,0 +1,104 @@
+/*
+ * Cantata
+ *
+ * Copyright (c) 2011-2012 Craig Drummond <craig.p.drummond@gmail.com>
+ *
+ * ----
+ *
+ * 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 of the License, or
+ * (at your option) any later version.
+ *
+ * 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; see the file COPYING.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ */
+
+#include "httpsocket.h"
+#include <QtNetwork/QTcpSocket>
+#include <QtCore/QStringList>
+#include <QtCore/QTextStream>
+#include <QtCore/QFile>
+#include <QtCore/QUrl>
+
+HttpSocket::HttpSocket(quint16 p)
+    : QTcpServer(0)
+    , portNumber(p)
+    , terminated(false)
+{
+    listen(QHostAddress::LocalHost, portNumber);
+}
+
+void HttpSocket::terminate()
+{
+    terminated=true;
+    deleteLater();
+}
+
+void HttpSocket::incomingConnection(int socket)
+{
+    QTcpSocket *s = new QTcpSocket(this);
+    connect(s, SIGNAL(readyRead()), this, SLOT(readClient()));
+    connect(s, SIGNAL(disconnected()), this, SLOT(discardClient()));
+    s->setSocketDescriptor(socket);
+}
+
+void HttpSocket::readClient()
+{
+    if (terminated) {
+        return;
+    }
+
+    QTcpSocket *socket = (QTcpSocket*)sender();
+    if (socket->canReadLine()) {
+        QString line=socket->readLine();
+        QStringList tokens = line.split(QRegExp("[ \r\n][ \r\n]*"));
+        if (QLatin1String("GET")==tokens[0]) {
+            QUrl url(tokens[1]);
+            bool ok=false;
+            if (url.hasQueryItem("cantata")) {
+                QFile f(url.path());
+
+                if (f.open(QIODevice::ReadOnly)) {
+                    ok=true;
+                    for(; !terminated;) {
+                        QByteArray buffer=f.read(4096);
+                        if (buffer.size()>0) {
+                            socket->write(buffer);
+                        } else {
+                            break;
+                        }
+                    }
+                }
+            }
+
+            if (!ok) {
+                QTextStream os(socket);
+                os.setAutoDetectUnicode(true);
+                os << "HTTP/1.0 404 Ok\r\n"
+                      "Content-Type: text/html; charset=\"utf-8\"\r\n"
+                      "\r\n"
+                      "<h1>Nothing to see here</h1>\n";
+            }
+
+            socket->close();
+
+            if (QTcpSocket::UnconnectedState==socket->state()) {
+                delete socket;
+            }
+        }
+    }
+}
+
+void HttpSocket::discardClient()
+{
+    QTcpSocket *socket = (QTcpSocket*)sender();
+    socket->deleteLater();
+}