feat(ui): add custom MSA client id setting

launcher/ui/pages/global/APIPage.cpp

@@ -0,0 +1,67 @@
+/* Copyright 2013-2021 MultiMC & PolyMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "APIPage.h"
+#include "ui_APIPage.h"
+
+#include <QMessageBox>
+#include <QFileDialog>
+#include <QStandardPaths>
+#include <QTabBar>
+#include <QVariant>
+
+#include "settings/SettingsObject.h"
+#include "tools/BaseProfiler.h"
+#include "Application.h"
+
+APIPage::APIPage(QWidget *parent) :
+    QWidget(parent),
+    ui(new Ui::APIPage)
+{
+    static QRegularExpression validUrlRegExp("https?://.+");
+    ui->setupUi(this);
+    ui->urlChoices->setValidator(new QRegularExpressionValidator(validUrlRegExp, ui->urlChoices));
+    ui->tabWidget->tabBar()->hide();\
+    loadSettings();
+}
+
+APIPage::~APIPage()
+{
+    delete ui;
+}
+
+void APIPage::loadSettings()
+{
+    auto s = APPLICATION->settings();
+    QString pastebinURL = s->get("PastebinURL").toString();
+    ui->urlChoices->setCurrentText(pastebinURL);
+    QString msaClientID = s->get("MSAClientIDOverride").toString();
+    ui->msaClientID->setText(msaClientID);
+}
+
+void APIPage::applySettings()
+{
+    auto s = APPLICATION->settings();
+    QString pastebinURL = ui->urlChoices->currentText();
+    s->set("PastebinURL", pastebinURL);
+    QString msaClientID = ui->msaClientID->text();
+    s->set("MSAClientIDOverride", msaClientID);
+}
+
+bool APIPage::apply()
+{
+    applySettings();
+    return true;
+}