comparison framework/VersionTester.cpp @ 180:84b2c1a4984a

* Offer the user a chance to answer our survey (only once, and only after
  several runs of the program, and only if the survey is known to be live on
  the website)

+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Sonic Visualiser
+    An audio file viewer and annotation editor.
+    Centre for Digital Music, Queen Mary, University of London.
+    
+    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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+/*
+   This is a modified version of a source file from the 
+   Rosegarden MIDI and audio sequencer and notation editor.
+   This file copyright 2000-2009 Chris Cannam.
+*/
+
+#include "VersionTester.h"
+
+#include <iostream>
+
+#include <QHttp>
+
+VersionTester::VersionTester(QString hostname, QString versionFilePath,
+			     QString myVersion) :
+    m_httpFailed(false),
+    m_myVersion(myVersion)
+{
+    QHttp *http = new QHttp();
+    connect(http, SIGNAL(responseHeaderReceived(const QHttpResponseHeader &)),
+            this, SLOT(httpResponseHeaderReceived(const QHttpResponseHeader &)));
+    connect(http, SIGNAL(done(bool)),
+            this, SLOT(httpDone(bool)));
+    http->setHost(hostname);
+    http->get(versionFilePath);
+}
+
+VersionTester::~VersionTester()
+{
+}
+
+bool
+VersionTester::isVersionNewerThan(QString a, QString b)
+{
+    QRegExp re("[._-]");
+    QStringList alist = a.split(re, QString::SkipEmptyParts);
+    QStringList blist = b.split(re, QString::SkipEmptyParts);
+    int ae = alist.size();
+    int be = blist.size();
+    int e = std::max(ae, be);
+    for (int i = 0; i < e; ++i) {
+    int an = 0, bn = 0;
+    if (i < ae) {
+        an = alist[i].toInt();
+        if (an == 0) an = -1; // non-numeric field -> "-pre1" etc
+    }
+    if (i < be) {
+        bn = blist[i].toInt();
+        if (bn == 0) bn = -1;
+    }
+    if (an < bn) return false;
+    if (an > bn) return true;
+    }
+    return false;
+}
+
+void
+VersionTester::httpResponseHeaderReceived(const QHttpResponseHeader &h)
+{
+    if (h.statusCode() / 100 != 2) m_httpFailed = true;
+}
+
+void
+VersionTester::httpDone(bool error)
+{
+    QHttp *http = const_cast<QHttp *>(dynamic_cast<const QHttp *>(sender()));
+    if (!http) return;
+    http->deleteLater();
+    if (error || m_httpFailed) return;
+
+    QByteArray responseData = http->readAll();
+    QString str = QString::fromUtf8(responseData.data());
+    QStringList lines = str.split('\n', QString::SkipEmptyParts);
+    if (lines.empty()) return;
+
+    QString latestVersion = lines[0];
+    std::cerr << "Comparing current version \"" << m_myVersion.toStdString()
+              << "\" with latest version \"" << latestVersion.toStdString()
+	      << "\"" << std::endl;
+    if (isVersionNewerThan(latestVersion, m_myVersion)) {
+        emit newerVersionAvailable(latestVersion);
+    }
+}
+
+