From 22c921a910d236abf3a1705a02541a49fdaf3a14 Mon Sep 17 00:00:00 2001
From: Emily Bernier <ember@google.com>
Date: Wed, 28 May 2014 11:01:32 -0400
Subject: [PATCH] Add an app ops code for microphone muting.

When OP_AUDIO_MICROPHONE (linked to the DISALLOW_UNMUTE_MICROPHONE user
restriction) is set, the system blocks calls to setMicrophoneMute.

Bug: 13585692

Change-Id: Ib32138bcc256cfbac4fe21a090d5ba34f5c641fc
---
 core/java/android/app/AppOpsManager.java    | 13 +++++++++++--
 media/java/android/media/AudioManager.java  |  7 ++++++-
 media/java/android/media/AudioService.java  | 10 ++++++++++
 media/java/android/media/IAudioService.aidl |  2 ++
 4 files changed, 29 insertions(+), 3 deletions(-)

diff --git a/core/java/android/app/AppOpsManager.java b/core/java/android/app/AppOpsManager.java
index 586723230ee4a..a480219fbf408 100644
--- a/core/java/android/app/AppOpsManager.java
+++ b/core/java/android/app/AppOpsManager.java
@@ -189,7 +189,9 @@ public class AppOpsManager {
     /** @hide Retrieve current usage stats via {@link UsageStatsManager}. */
     public static final int OP_GET_USAGE_STATS = 43;
     /** @hide */
-    public static final int _NUM_OP = 44;
+    public static final int OP_MUTE_MICROPHONE = 44;
+    /** @hide */
+    public static final int _NUM_OP = 45;
 
     /** Access to coarse location information. */
     public static final String OPSTR_COARSE_LOCATION =
@@ -257,6 +259,7 @@ public class AppOpsManager {
             OP_COARSE_LOCATION,
             OP_COARSE_LOCATION,
             OP_GET_USAGE_STATS,
+            OP_MUTE_MICROPHONE
     };
 
     /**
@@ -308,6 +311,7 @@ public class AppOpsManager {
             OPSTR_MONITOR_LOCATION,
             OPSTR_MONITOR_HIGH_POWER_LOCATION,
             null,
+            null,
     };
 
     /**
@@ -358,7 +362,8 @@ public class AppOpsManager {
             "WAKE_LOCK",
             "MONITOR_LOCATION",
             "MONITOR_HIGH_POWER_LOCATION",
-            "GET_USAGE_STATS"
+            "GET_USAGE_STATS",
+            "OP_MUTE_MICROPHONE",
     };
 
     /**
@@ -410,6 +415,7 @@ public class AppOpsManager {
             null, // no permission for generic location monitoring
             null, // no permission for high power location monitoring
             android.Manifest.permission.PACKAGE_USAGE_STATS,
+            null, // no permission for muting/unmuting microphone
     };
 
     /**
@@ -462,6 +468,7 @@ public class AppOpsManager {
             null, //MONITOR_LOCATION
             null, //MONITOR_HIGH_POWER_LOCATION
             null, //GET_USAGE_STATS
+            UserManager.DISALLOW_UNMUTE_MICROPHONE, // MUTE_MICROPHONE
     };
 
     /**
@@ -512,6 +519,7 @@ public class AppOpsManager {
             AppOpsManager.MODE_ALLOWED,
             AppOpsManager.MODE_ALLOWED,
             AppOpsManager.MODE_IGNORED, // OP_GET_USAGE_STATS
+            AppOpsManager.MODE_ALLOWED,
     };
 
     /**
@@ -566,6 +574,7 @@ public class AppOpsManager {
             false,
             false,
             false,
+            false,
     };
 
     private static HashMap<String, Integer> sOpStrToOp = new HashMap<String, Integer>();
diff --git a/media/java/android/media/AudioManager.java b/media/java/android/media/AudioManager.java
index 6280fdeca01fb..b1bc4c4d2fc83 100644
--- a/media/java/android/media/AudioManager.java
+++ b/media/java/android/media/AudioManager.java
@@ -1425,7 +1425,12 @@ public class AudioManager {
      *           <var>false</var> to turn mute off
      */
     public void setMicrophoneMute(boolean on){
-        AudioSystem.muteMicrophone(on);
+        IAudioService service = getService();
+        try {
+            service.setMicrophoneMute(on, mContext.getOpPackageName());
+        } catch (RemoteException e) {
+            Log.e(TAG, "Dead object in setMicrophoneMute", e);
+        }
     }
 
     /**
diff --git a/media/java/android/media/AudioService.java b/media/java/android/media/AudioService.java
index 2f782cca94947..d496117cd0617 100644
--- a/media/java/android/media/AudioService.java
+++ b/media/java/android/media/AudioService.java
@@ -1437,6 +1437,16 @@ public class AudioService extends IAudioService.Stub {
         }
     }
 
+    /** @see AudioManager#setMicrophoneMute(boolean) */
+    public void setMicrophoneMute(boolean on, String callingPackage) {
+        if (mAppOps.noteOp(AppOpsManager.OP_MUTE_MICROPHONE, Binder.getCallingUid(),
+                callingPackage) != AppOpsManager.MODE_ALLOWED) {
+            return;
+        }
+
+        AudioSystem.muteMicrophone(on);
+    }
+
     /** @see AudioManager#getRingerMode() */
     public int getRingerMode() {
         synchronized(mSettingsLock) {
diff --git a/media/java/android/media/IAudioService.aidl b/media/java/android/media/IAudioService.aidl
index ba3cfb6034086..c29e967868fe3 100644
--- a/media/java/android/media/IAudioService.aidl
+++ b/media/java/android/media/IAudioService.aidl
@@ -78,6 +78,8 @@ interface IAudioService {
 
     int getLastAudibleMasterVolume();
 
+    void setMicrophoneMute(boolean on, String callingPackage);
+
     void setRingerMode(int ringerMode);
 
     int getRingerMode();