[MacOS] Ask user for permission to access microphone

This is required for MacOS 10.14 and later. This also requires an explanation why
access is required in the apps Info.plist. Hence added custom Info.plist templates
for each app.

src/blackmisc/blackmisc.pro

@@ -70,6 +70,10 @@ SOURCES +=  *.cpp \
             $$PWD/test/*.cpp \
             $$PWD/weather/*.cpp
 
+macx {
+    HEADERS += $$PWD/macos/microphoneaccess.h
+    OBJECTIVE_SOURCES += $$PWD/macos/microphoneaccess.mm
+}
 
 INCLUDEPATH *= $$EXTERNALSROOT/common/include/crashpad
 INCLUDEPATH *= $$EXTERNALSROOT/common/include/crashpad/mini_chromium
@@ -87,7 +91,7 @@ msvc {
     CONFIG(debug, debug|release): LIBS *= -lclientd -lutild -lbased -lRpcrt4 -lAdvapi32
     CONFIG(release, debug|release): LIBS *= -lclient -lutil -lbase -lRpcrt4 -lAdvapi32
 }
-macx: LIBS += -lclient -lutil -lbase -lbsm -framework Security -framework CoreFoundation -framework ApplicationServices -framework Foundation
+macx: LIBS += -lclient -lutil -lbase -lbsm -framework AVFoundation -framework Security -framework CoreFoundation -framework ApplicationServices -framework Foundation
 unix:!macx: LIBS *= -lclient -lutil -lbase
 
 DESTDIR = $$DestRoot/lib

src/blackmisc/macos/microphoneaccess.h

@@ -0,0 +1,48 @@
+/* Copyright (C) 2019
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
+ * or distributed except according to the terms contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_AUDIOACCESSREQUEST_H
+#define BLACKMISC_AUDIOACCESSREQUEST_H
+
+#include "blackmisc/blackmiscexport.h"
+#include <QtGlobal>
+#include <QObject>
+
+namespace BlackMisc
+{
+    //! Wrapper around MacOS 10.14 AVCaptureDevice AVCaptureDevice authorization
+    class BLACKMISC_EXPORT CMacOSMicrophoneAccess : public QObject
+    {
+        Q_OBJECT
+    public:
+        //! Authorization status
+        enum AuthorizationStatus
+        {
+            Authorized,
+            Denied,
+            NotDetermined
+        };
+
+        //! Constructor
+        CMacOSMicrophoneAccess(QObject *parent = nullptr);
+
+        //! Request access
+        void requestAccess();
+
+        //! Get current authorization status
+        AuthorizationStatus getAuthorizationStatus();
+
+    signals:
+        //! User has answered the permission request popup
+        void permissionRequestAnswered(bool granted);
+    };
+}
+
+#endif

src/blackmisc/macos/microphoneaccess.mm

@@ -0,0 +1,62 @@
+/* Copyright (C) 2019
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution. No part of swift project, including this file, may be copied, modified, propagated,
+ * or distributed except according to the terms contained in the LICENSE file.
+ */
+
+#include "microphoneaccess.h"
+#import <AVFoundation/AVFoundation.h>
+
+namespace BlackMisc
+{
+//#ifdef Q_OS_MAC
+
+    BlackMisc::CMacOSMicrophoneAccess::CMacOSMicrophoneAccess(QObject *parent) :
+        QObject(parent)
+    { }
+
+    void CMacOSMicrophoneAccess::requestAccess()
+    {
+        if (@available(macOS 10.14, *))
+        {
+            NSString *mediaType = AVMediaTypeAudio;
+            [AVCaptureDevice requestAccessForMediaType:mediaType completionHandler:^(BOOL granted)
+            {
+                emit permissionRequestAnswered(granted);
+            }];
+        }
+        else
+        {
+            emit permissionRequestAnswered(true);
+        }
+
+    }
+
+    CMacOSMicrophoneAccess::AuthorizationStatus CMacOSMicrophoneAccess::getAuthorizationStatus()
+    {
+        if (@available(macOS 10.14, *))
+        {
+            NSString *mediaType = AVMediaTypeAudio;
+            AVAuthorizationStatus authStatus = [AVCaptureDevice authorizationStatusForMediaType:mediaType];
+            if(authStatus == AVAuthorizationStatusAuthorized)
+            {
+                return AuthorizationStatus::Authorized;
+            }
+            else if(authStatus == AVAuthorizationStatusNotDetermined)
+            {
+                return AuthorizationStatus::NotDetermined;
+            }
+            return AuthorizationStatus::Denied;
+        }
+        else
+        {
+            return AuthorizationStatus::Authorized;
+        }
+
+    }
+
+// #endif
+}
+