# HG changeset patch
# User Hasan Yavuz ÖZDERYA <hy@ozderya.net>
# Date 2017-08-17 12:27:52
# Node ID 30dd8e7784b01e426058a08bd1c717dccd890341
# Parent  0d495816e66c8643158c83eaec0378ea46f803f4

getting file list from bitbucket downloads page via api

diff --git a/CMakeLists.txt b/CMakeLists.txt
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -126,6 +126,7 @@ add_executable(${PROGRAM_NAME} WIN32
   src/framedreadersettings.cpp
   src/plotmanager.cpp
   src/numberformat.cpp
+  src/updatechecker.cpp
   misc/windows_icon.rc
   ${UI_FILES}
   ${RES_FILES}
@@ -136,7 +137,7 @@ target_link_libraries(${PROGRAM_NAME}
   ${QWT_LIBRARY}
   ${QTCOLORWIDGETS_LIBRARIES}
   )
-qt5_use_modules(${PROGRAM_NAME} Widgets SerialPort)
+qt5_use_modules(${PROGRAM_NAME} Widgets SerialPort Network)
 
 if (BUILD_QWT)
   add_dependencies(${PROGRAM_NAME} QWT)
diff --git a/serialplot.pro b/serialplot.pro
--- a/serialplot.pro
+++ b/serialplot.pro
@@ -68,7 +68,8 @@ SOURCES += \
     src/framedreader.cpp \
     src/plotmanager.cpp \
     src/numberformat.cpp \
-    src/recordpanel.cpp
+    src/recordpanel.cpp \
+    src/updatechecker.cpp
 
 HEADERS += \
     src/mainwindow.h \
@@ -108,7 +109,8 @@ HEADERS += \
     src/plotmanager.h \
     src/setting_defines.h \
     src/numberformat.h \
-    src/recordpanel.h
+    src/recordpanel.h \
+    src/updatechecker.h
 
 FORMS += \
     src/mainwindow.ui \
diff --git a/src/mainwindow.cpp b/src/mainwindow.cpp
--- a/src/mainwindow.cpp
+++ b/src/mainwindow.cpp
@@ -60,6 +60,7 @@ MainWindow::MainWindow(QWidget *parent) 
     aboutDialog(this),
     portControl(&serialPort),
     channelMan(1, 1, this),
+    updateChecker(this),
     snapshotMan(this, &channelMan),
     commandPanel(&serialPort),
     dataFormatPanel(&serialPort, &channelMan, &recorder),
@@ -238,6 +239,9 @@ MainWindow::MainWindow(QWidget *parent) 
     QObject::connect(ui->actionDemoMode, &QAction::toggled,
                      plotMan, &PlotManager::showDemoIndicator);
 
+    // TEST UPDATE CHECKER
+    updateChecker.checkUpdate();
+
     // load default settings
     QSettings settings("serialplot", "serialplot");
     loadAllSettings(&settings);
diff --git a/src/mainwindow.h b/src/mainwindow.h
--- a/src/mainwindow.h
+++ b/src/mainwindow.h
@@ -45,6 +45,7 @@
 #include "snapshotmanager.h"
 #include "plotmanager.h"
 #include "datarecorder.h"
+#include "updatechecker.h"
 
 namespace Ui {
 class MainWindow;
@@ -79,6 +80,7 @@ private:
     PlotManager* plotMan;
     SnapshotManager snapshotMan;
     DataRecorder recorder;       // operated by `recordPanel`
+    UpdateChecker updateChecker;
 
     QLabel spsLabel;
     CommandPanel commandPanel;
diff --git a/src/updatechecker.cpp b/src/updatechecker.cpp
new file mode 100644
--- /dev/null
+++ b/src/updatechecker.cpp
@@ -0,0 +1,107 @@
+#include "updatechecker.h"
+#include <QtDebug>
+#include <QJsonDocument>
+#include <QJsonObject>
+#include <QJsonArray>
+#include <QJsonValue>
+
+// This returns the list of downloads in JSON format. Note that we only use the first
+// page because results are sorted in new to old.
+const char BB_DOWNLOADS_URL[] = "https://api.bitbucket.org/2.0/repositories/hyozd/serialplot/downloads?fields=values.name,values.links.self.href";
+
+UpdateChecker::UpdateChecker(QObject *parent) :
+    QObject(parent), nam(this)
+{
+    connect(&nam, &QNetworkAccessManager::finished,
+            this, &UpdateChecker::onReqFinished);
+}
+
+void UpdateChecker::checkUpdate()
+{
+    auto req = QNetworkRequest(QUrl(BB_DOWNLOADS_URL));
+    nam.get(req);
+}
+
+void UpdateChecker::onReqFinished(QNetworkReply* reply)
+{
+    qDebug() << "finished";
+    if (reply->error() != QNetworkReply::NoError)
+    {
+        emit checkFailed(QString("Network error: ") + reply->errorString());
+    }
+    else
+    {
+        QJsonParseError error;
+        auto data = QJsonDocument::fromJson(reply->readAll(), &error);
+        if (error.error != QJsonParseError::NoError)
+        {
+            emit checkFailed(QString("JSon parsing error: ") + error.errorString());
+        }
+        else
+        {
+            QList<FileInfo> files;
+            if (!parseData(data, files))
+            {
+                // TODO: emit detailed data contents for logging
+                emit checkFailed("Data parsing error.");
+                qDebug() << "Data parsing error.";
+            }
+            else
+            {
+                for (auto f : files)
+                {
+                    qDebug() << f.name << f.link;
+                }
+            }
+        }
+    }
+    reply->deleteLater();
+}
+
+bool UpdateChecker::parseData(const QJsonDocument& data, QList<FileInfo>& files)
+{
+    /* Data is expected to be in this form:
+
+    {
+       "values": [
+       {
+         "name": "serialplot-0.9.1-x86_64.AppImage",
+         "links": {
+           "self": {
+             "href": "https://api.bitbucket.org/2.0/repositories/hyOzd/serialplot/downloads/serialplot-0.9.1-x86_64.AppImage"
+            }
+          }
+       }, ... ]
+    }
+    */
+
+    if (!data.isObject()) return false;
+
+    auto values = data.object()["values"];
+    if (values == QJsonValue::Undefined || !values.isArray()) return false;
+
+    for (auto value : values.toArray())
+    {
+        if (!value.isObject()) return false;
+
+        auto name = value.toObject().value("name");
+        if (name.isUndefined() || !name.isString())
+             return false;
+
+        auto links = value.toObject().value("links");
+        if (links.isUndefined() || !links.isObject())
+            return false;
+
+        auto self = links.toObject().value("self");
+        if (self.isUndefined() || !self.isObject())
+            return false;
+
+        auto href = self.toObject().value("href");
+        if (href.isUndefined() || !href.isString())
+            return false;
+
+        files += {name.toString(), href.toString()};
+    }
+
+    return true;
+}
diff --git a/src/updatechecker.h b/src/updatechecker.h
new file mode 100644
--- /dev/null
+++ b/src/updatechecker.h
@@ -0,0 +1,37 @@
+#ifndef UPDATECHECKER_H
+#define UPDATECHECKER_H
+
+#include <QObject>
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
+#include <QList>
+
+class UpdateChecker : public QObject
+{
+    Q_OBJECT
+public:
+    explicit UpdateChecker(QObject *parent = 0);
+
+signals:
+    void updateFound();
+    void checkFinished(bool found, QString newVersion, QString downloadUrl);
+    void checkFailed(QString errorMessage);
+
+public slots:
+    void checkUpdate();
+
+private:
+    struct FileInfo
+    {
+        QString name;
+        QString link;
+    };
+
+    QNetworkAccessManager nam;
+    bool parseData(const QJsonDocument& data, QList<FileInfo>& files);
+
+private slots:
+    void onReqFinished(QNetworkReply* reply);
+};
+
+#endif // UPDATECHECKER_H