First handshake with pica

API/CMakeLists.txt

@@ -0,0 +1,9 @@
+set(HEADERS
+    api.h
+)
+
+set(SOURCES
+    api.cpp
+)
+
+target_sources(megpie PRIVATE ${SOURCES})

API/api.cpp

@@ -0,0 +1,93 @@
+#include "api.h"
+#include <QDebug>
+#include <QJsonDocument>
+#include <QJsonObject>
+
+constexpr const char* json = "application/json";
+
+struct NetworkReplyDeleter {
+    void operator () (QNetworkReply* reply) {
+        reply->deleteLater();
+    }
+};
+
+API::API(const QUrl& address, QObject* parent):
+    QObject(parent),
+    address(address),
+    network()
+{
+
+}
+
+void API::test(const QString& path, const QJSValue& finished) {
+    qDebug() << "Testing" << path;
+    QNetworkRequest request(path + "/info");
+    request.setHeader(QNetworkRequest::ContentTypeHeader, json);
+
+    QNetworkReply* reply = network.get(request);
+    connect(reply, &QNetworkReply::finished,
+        std::bind(&API::onTestSuccess, this, reply, finished)
+    );
+}
+
+void API::onTestSuccess(QNetworkReply* reply, const QJSValue& finished) const {
+    std::unique_ptr<QNetworkReply, NetworkReplyDeleter> rpl(reply);
+    QNetworkReply::NetworkError error = reply->error();
+    if (error != QNetworkReply::NoError) {
+        QString err = reply->errorString();
+        qDebug() << "Test for" << reply->url() << "failed:" << err;
+        callCallback(finished, err);
+        return;
+    }
+
+    QVariant contentType = reply->header(QNetworkRequest::ContentTypeHeader);
+    if (!
+        contentType.isValid() ||
+        !contentType.canConvert<QString>() ||
+        contentType.toString() != json
+    ) {
+        QString err("wrong response content type");
+        qDebug() << "Test for" << reply->url() << "failed:" << err;
+        callCallback(finished, err);
+        return;
+    }
+
+    QByteArray data = reply->readAll();
+    QJsonDocument document = QJsonDocument::fromJson(data);
+    QJsonObject rootObj = document.object();
+
+    QJsonValue type = rootObj.value("type");
+    QJsonValue version = rootObj.value("version");
+    if (!type.isString() || !version.isString()) {
+        QString err("malformed json");
+        qDebug() << "Test for" << reply->url() << "failed:" << err;
+        callCallback(finished, err);
+        return;
+    }
+
+    if (type.toString() != "Pica") {
+        QString err("server of this type (" + type.toString() + ") is not supported");
+        qDebug() << "Test for" << reply->url() << "failed:" << err;
+        callCallback(finished, err);
+        return;
+    }
+
+    if (version.toString() != "0.0.1") {
+        QString err("server of this version (" + version.toString() + ") is not supported");
+        qDebug() << "Test for" << reply->url() << "failed:" << err;
+        callCallback(finished, err);
+        return;
+    }
+
+    callCallback(finished, QString(), {QJSValue(true)});
+}
+
+void API::callCallback(const QJSValue& callback, const QString& error, const QJSValueList& arguments) const {
+    if (callback.isCallable()) {
+        if (error.isEmpty())
+            callback.call(QJSValueList({QJSValue(QJSValue::NullValue)}) + arguments);
+        else
+            callback.call({QJSValue(error)});
+    }
+}
+

API/api.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <memory>
+
+#include <QObject>
+#include <QString>
+#include <QUrl>
+#include <QJSValue>
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
+
+class API : public QObject {
+    Q_OBJECT
+public:
+    explicit API(const QUrl& path = QString(), QObject* parent = nullptr);
+
+    Q_INVOKABLE void test(const QString& path, const QJSValue& finished = QJSValue());
+
+private slots:
+    void onTestSuccess(QNetworkReply* reply, const QJSValue& finished) const;
+
+private:
+    void callCallback(const QJSValue& callback, const QString& error = QString(), const QJSValueList& arguments = QJSValueList()) const;
+
+private:
+    QUrl address;
+    QNetworkAccessManager network;
+};

CMakeLists.txt

@@ -54,6 +54,7 @@ else()
 endif()
 
 add_subdirectory(qml)
+add_subdirectory(API)
 
 target_link_libraries(megpie PRIVATE
     Qt6::Core

main.cpp

@@ -4,28 +4,6 @@
 #include "root.h"
 
 int main(int argc, char *argv[]) {
-    Root app(argc, argv);
+    Root app(u"qrc:qml/main.qml"_qs, argc, argv);
-
+    return app.exec();
-    std::cout << "Starting" << std::endl;
-    QQmlApplicationEngine engine;
-    const QUrl url(u"qrc:qml/main.qml"_qs);
-    QObject::connect(
-        &engine, &QQmlApplicationEngine::objectCreated, &app,
-        [&url](QObject* obj, const QUrl& objUrl) {
-            if (!obj && url == objUrl)
-                QCoreApplication::exit(-2);
-        },
-        Qt::QueuedConnection);
-
-    engine.load(url);
-    if (engine.rootObjects().isEmpty())
-        return -1;
-
-    int result;
-    try {
-        result = app.exec();
-    } catch (...) {
-    }
-
-    return result;
 }

main_web.cpp

@@ -4,22 +4,13 @@
 #include "root.h"
 
 int main(int argc, char *argv[]) {
-    Root* app = new Root(argc, argv);
+    Root* app;
 
-    std::cout << "Starting" << std::endl;
+    try {
-    QQmlApplicationEngine* engine = new QQmlApplicationEngine();
+        app = new Root(u"qrc:qml/main.qml"_qs, argc, argv);
-    const QUrl url(u"qrc:qml/main.qml"_qs);
+    } catch (const std::exception& exception) {
-    QObject::connect(
+        std::cerr << "Couldn't start megpie: " << exception.what() << std::endl;
-        engine, &QQmlApplicationEngine::objectCreated, app,
+    }
-        [url](QObject* obj, const QUrl& objUrl) {
-            if (!obj && url == objUrl)
-                QCoreApplication::exit(-2);
-        },
-        Qt::QueuedConnection);
-
-    engine->load(url);
-    if (engine->rootObjects().isEmpty())
-        return -1;
 
     return 0;
 }

qml/CMakeLists.txt

@@ -6,6 +6,8 @@ qt_add_qml_module(megpieQml
     NO_PLUGIN
     QML_FILES
         main.qml
+        ServerPick.qml
+        Welcome.qml
 )
 
 target_link_libraries(megpie PRIVATE megpieQml)

qml/ServerPick.qml

@@ -0,0 +1,138 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+
+Page {
+    property string address
+    property bool valid
+
+    signal back()
+    signal success(address: string)
+
+    title: qsTr("Chosing a server")
+
+    Column {
+        anchors.centerIn: parent
+        spacing: 10
+
+        Label {
+            anchors.horizontalCenter: parent.horizontalCenter
+            id: label
+            text: qsTr("Type server address in the field below")
+        }
+        TextField {
+            width: parent.width
+            anchors.horizontalCenter: parent.horizontalCenter
+            id: input
+            placeholderText: "https://example.org"
+            text: address
+            onAccepted: modal.check()
+            validator: RegularExpressionValidator {
+                regularExpression: /^(?:http|https)?:\/\/(?:\w*\.)*(?:\w)+(?:\:\d+)?(?:(?:\/\w+)\/?)*$/
+            }
+        }
+
+        Row {
+            anchors.horizontalCenter: parent.horizontalCenter
+            spacing: 10
+
+            Button {
+                text: qsTr("Cancel")
+                onClicked: back()
+            }
+            Button {
+                text: qsTr("Confirm")
+                enabled: input.acceptableInput
+                onClicked: modal.check()
+            }
+        }
+
+        Popup {
+            property bool inProgress: false
+
+            id: modal
+            anchors.centerIn: parent
+            modal: true
+            focus: true
+            width: column.width + 60
+            height: column.height + 60
+            closePolicy: Popup.CloseOnEscape
+            onClosed: function () {
+                modal.inProgress = false;
+                if (valid)
+                    success(address);
+            }
+
+            Column {
+                id: column
+                anchors.centerIn: parent
+                spacing: 10
+                Label {
+                    id: status
+                    width: 300
+                    wrapMode: Label.WordWrap
+                    horizontalAlignment: Label.AlignHCenter
+                }
+                BusyIndicator {
+                    id: indicator
+                    anchors.horizontalCenter: parent.horizontalCenter
+                    visible: modal.inProgress
+                    running: modal.inProgress
+                }
+                Button {
+                    id: button
+                    text: qsTr("Close")
+                    anchors.horizontalCenter: parent.horizontalCenter
+                    visible: !modal.inProgress
+                    onClicked: modal.close()
+                    focus: true
+                    Keys.onReturnPressed: {
+                        if (!modal.inProgress)
+                            modal.close()
+                    }
+                }
+            }
+
+            enter: Transition {
+                NumberAnimation {
+                    property: "opacity"
+                    from: 0.0
+                    to: 1.0
+                    duration: 200
+                }
+            }
+            exit: Transition {
+                NumberAnimation {
+                    property: "opacity"
+                    from: 1.0
+                    to: 0.0
+                    duration: 200
+                }
+            }
+
+            function check () {
+                valid = false;
+                modal.inProgress = true;
+                status.text = qsTr("Checking") + " " + address + "...";
+                modal.open()
+
+                API.test(input.text, function (err, success) {
+                    if (!modal.inProgress)
+                        return;
+
+                    modal.inProgress = false;
+                    if (err)
+                        status.text = err;
+                    else
+                        status.text = qsTr("Success");
+
+                    valid = !!success;
+                    if (valid) {
+                        address = input.text;
+                        modal.close()
+                    }
+                });
+            }
+        }
+    }
+}

qml/Welcome.qml

@@ -0,0 +1,48 @@
+import QtQuick
+import QtQuick.Controls
+import QtQuick.Layouts
+
+Page {
+    property string serverAddress
+
+    signal pickServer(address: string)
+
+    title: qsTr("Welcome")
+
+    Column {
+        anchors.centerIn: parent
+        spacing: 10
+
+        Label {
+            anchors.horizontalCenter: parent.horizontalCenter
+            text: qsTr("Welcome to Megpie!")
+            font {
+                pixelSize: 22
+                bold: true
+            }
+        }
+
+        Row {
+            anchors.horizontalCenter: parent.horizontalCenter
+            spacing: 5
+
+            Label {
+                horizontalAlignment: Label.AlignRight
+                text: qsTr("Current server:")
+            }
+            Label {
+                horizontalAlignment: Label.AlignLeft
+                text: serverAddress || qsTr("choose")
+                font {
+                    italic: true
+                    underline: true
+                }
+
+                MouseArea {
+                    anchors.fill: parent
+                    onClicked: pickServer(serverAddress)
+                }
+            }
+        }
+    }
+}

qml/main.qml

@@ -3,57 +3,43 @@ import QtQuick.Window
 import QtQuick.Controls
 import QtQuick.Layouts
 
-Window {
+
+
+ApplicationWindow {
     property int counter: 0
 
     id: window
     width: 640
     height: 480
     visible: true
-    title: qsTr("Hello World")
+    title: "Megpie"
 
-    Rectangle {
+    header: Label {
-        id: page
+        text: stack.currentItem.title
+        horizontalAlignment: Text.AlignHCenter
+    }
+
+    StackView {
+        id: stack
+        initialItem: welcome
         anchors.fill: parent
-        anchors.centerIn: parent
+    }
-        color: increment.down ? "blue" : decrement.down ? "red" : "lightgrey"
 
-        Behavior on color {
+    Welcome {
-            ColorAnimation {
+        id: welcome
-                duration: 100
+        onPickServer: function (address) {
-                target: page
+            pick.address = address;
-                easing.type: Easing.InOutQuad
+            stack.push(pick)
         }
     }
 
-        GridLayout {
+    ServerPick {
-            anchors.centerIn: parent
+        visible: false
-            columns: 2
+        id: pick
-
+        onBack: stack.pop()
-            Text {
+        onSuccess: function (address) {
-                Layout.columnSpan: 2
+            welcome.serverAddress = address;
-                Layout.alignment: Qt.AlignHCenter
+            stack.pop();
-                text: qsTr("Hello World")
-                font.pointSize: 24; font.bold: true
-            }
-
-            Button {
-                id: increment
-                text: "Increment"
-                onClicked: window.counter++
-            }
-
-            Button {
-                id: decrement
-                text: "Decrement"
-                onClicked: window.counter--
-            }
-
-            Text {
-                Layout.columnSpan: 2
-                Layout.alignment: Qt.AlignHCenter
-                text: "The value is " + window.counter
-            }
         }
     }
 }

root.cpp

@@ -1,9 +1,24 @@
 #include "root.h"
 
-Root::Root(int& argc, char* argv[]) :
+Root::Root(const QUrl& root, int& argc, char* argv[]) :
-    QGuiApplication(argc, argv)
+    QGuiApplication(argc, argv),
+    root(root),
+    engine(),
+    context(engine.rootContext()),
+    api()
 {
+    std::cout << "Starting megpie..." << std::endl;
 
+    connect(&engine, &QQmlApplicationEngine::objectCreated,
+        this, &Root::onObjectCreated,
+        Qt::QueuedConnection
+    );
+
+    engine.load(root);
+    if (engine.rootObjects().isEmpty())
+        throw std::runtime_error("Couldn't looad root qml object");
+
+    context->setContextProperty("API", &api);
 }
 
 Root::~Root() {
@@ -25,3 +40,8 @@ bool Root::notify(QObject* receiver, QEvent* e) {
     exit(1);
     return false;
 }
+
+void Root::onObjectCreated(QObject* obj, const QUrl& objUrl) {
+    if (!obj && objUrl == root)
+        exit(-2);
+}

root.h

@@ -1,13 +1,28 @@
 #pragma once
 
 #include <iostream>
+#include <stdexcept>
 
+#include <QString>
 #include <QGuiApplication>
+#include <QQmlApplicationEngine>
+#include <QQmlContext>
+
+#include "API/api.h"
 
 class Root : public QGuiApplication {
     Q_OBJECT
 public:
-    Root(int& argc, char* argv[]);
+    Root(const QUrl& root, int& argc, char* argv[]);
     ~Root();
     bool notify(QObject* receiver, QEvent* e) override;
+
+private slots:
+    void onObjectCreated(QObject* obj, const QUrl& objUrl);
+
+private:
+    QUrl root;
+    QQmlApplicationEngine engine;
+    QQmlContext* context;
+    API api;
 };