Add new app permissions API under QCoreApplication

The API allows users to request and check the status of various
permissions. A predefined enum class of the common permission types
on different platforms is used to allow requesting permission with
a common code. Platform specific permissions are defined only on their
relevant platform. For permissions that are not predefined, they can
be requested via a string variant of this API.

This adds the Android implementation only.

[ChangeLog][QtCore] Add new API for handling app permissions with an
initial implementation for Android.

Task-number: QTBUG-90498
Change-Id: I3bc98c6ab2dceeea3ee8edec20a332ed8f56ad4f
Reviewed-by: Sona Kurazyan <sona.kurazyan@qt.io>
Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

2 files changed, 146 insertions, 0 deletions

diff --git a/src/corelib/doc/snippets/permissions/permissions.cpp b/src/corelib/doc/snippets/permissions/permissions.cpp
new file mode 100644
index 0000000000..2eac419226
--- /dev/null
+++ b/src/corelib/doc/snippets/permissions/permissions.cpp
@@ -0,0 +1,141 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the documentation of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** BSD License Usage
+** Alternatively, you may use this file under the terms of the BSD license
+** as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtCore/qcoreapplication.h>
+#include <QtCore/qdebug.h>
+#include <QtCore/qstring.h>
+
+void takeSelfie() {};
+
+void requestCameraPermissionAndroid()
+{
+//! [Request camera permission on Android]
+     QCoreApplication::requestPermission(QStringLiteral("android.permission.CAMERA"))
+             .then([=](QPermission::PermissionResult result) {
+        if (result == QPermission::Authorized)
+            takeSelfie();
+    });
+//! [Request camera permission on Android]
+}
+
+void requestCameraPermission()
+{
+//! [Request camera permission]
+     QCoreApplication::requestPermission(QPermission::Camera)
+             .then([=](QPermission::PermissionResult result) {
+        if (result == QPermission::Authorized)
+            takeSelfie();
+    });
+//! [Request camera permission]
+}
+
+void requestCameraPermissionSyncAndroid()
+{
+//! [Request camera permission sync on Android]
+    auto future = QCoreApplication::requestPermission(QStringLiteral("android.permission.CAMERA"));
+    auto result = future.result(); // blocks and waits for the result to be ready
+    if (result == QPermission::Authorized)
+        takeSelfie();
+//! [Request camera permission sync on Android]
+}
+
+void requestCameraPermissionSync()
+{
+//! [Request camera permission sync]
+    auto future = QCoreApplication::requestPermission(QPermission::Camera);
+    auto result = future.result(); // blocks and waits for the result to be ready
+    if (result == QPermission::Authorized)
+        takeSelfie();
+//! [Request camera permission sync]
+}
+
+void checkCameraPermissionAndroid()
+{
+//! [Check camera permission on Android]
+    QCoreApplication::checkPermission(QStringLiteral("android.permission.CAMERA"))
+            .then([=](QPermission::PermissionResult result) {
+        if (result == QPermission::Authorized)
+            takeSelfie();
+    });
+//! [Check camera permission on Android]
+}
+
+void checkCameraPermission()
+{
+//! [Check camera permission]
+    QCoreApplication::checkPermission(QPermission::Camera)
+            .then([=](QPermission::PermissionResult result) {
+        if (result == QPermission::Authorized)
+            takeSelfie();
+    });
+//! [Check camera permission]
+}
+
+void checkCameraPermissionAndroidSync()
+{
+//! [Check camera permission sync on Android]
+    auto future = QCoreApplication::checkPermission(QStringLiteral("android.permission.CAMERA"));
+    // may block and wait for the result to be ready on some platforms
+    auto result = future.result();
+    if (result == QPermission::Authorized)
+        takeSelfie();
+//! [Check camera permission sync on Android]
+}
+
+void checkCameraPermissionSync()
+{
+//! [Check camera permission sync]
+    auto future = QCoreApplication::checkPermission(QPermission::Camera);
+    // may block and wait for the result to be ready on some platforms
+    auto result = future.result();
+    if (result == QPermission::Authorized)
+        takeSelfie();
+//! [Check camera permission sync]
+}
diff --git a/src/corelib/doc/src/external-resources.qdoc b/src/corelib/doc/src/external-resources.qdoc
index abd359ac33..e8f1d3348d 100644
--- a/src/corelib/doc/src/external-resources.qdoc
+++ b/src/corelib/doc/src/external-resources.qdoc
@@ -100,3 +100,8 @@
     \externalpage https://docs.oracle.com/en/java/javase/13/docs/specs/jni/functions.html#interface-function-table
     \title Java: Interface Function Table
 */
+
+/*!
+    \externalpage https://doc.qt.io/qtcreator/creator-deploying-android.html#editing-manifest-files
+    \title Qt Creator: Editing Manifest Files
+*/