Add SettingsManager.

Add new APIs for changing a subset of system settings.

Protected by cyanogenmod.permission.MODIFY_NETWORK_SETTINGS:
    - Add ability to toggle airplane mode on/off.
    - Add ability to toggle mobile data on/off.

Protected by android.permission.REBOOT:
    - Add ability to shutdown or reboot the device.

Change-Id: I5e943be11260c58afa664f1702c0ecb4413528fe

api/cm_current.txt

@@ -236,6 +236,14 @@ package cyanogenmod.app {
     field public static final int PROFILES_STATE_ENABLED = 1; // 0x1
   }
 
+  public class SettingsManager {
+    method public static cyanogenmod.app.SettingsManager getInstance(android.content.Context);
+    method public void rebootDevice();
+    method public void setAirplaneModeEnabled(boolean);
+    method public void setMobileDataEnabled(boolean);
+    method public void shutdownDevice();
+  }
+
   public class StatusBarPanelCustomTile implements android.os.Parcelable {
     ctor public StatusBarPanelCustomTile(java.lang.String, java.lang.String, java.lang.String, int, java.lang.String, int, int, cyanogenmod.app.CustomTile, android.os.UserHandle);
     ctor public StatusBarPanelCustomTile(java.lang.String, java.lang.String, java.lang.String, int, java.lang.String, int, int, cyanogenmod.app.CustomTile, android.os.UserHandle, long);
@@ -285,6 +293,7 @@ package cyanogenmod.platform {
 
   public static final class Manifest.permission {
     ctor public Manifest.permission();
+    field public static final java.lang.String MODIFY_SETTINGS = "cyanogenmod.permission.MODIFY_SETTINGS";
     field public static final java.lang.String PUBLISH_CUSTOM_TILE = "cyanogenmod.permission.PUBLISH_CUSTOM_TILE";
   }
 

cm/lib/main/java/org/cyanogenmod/platform/internal/SettingsManagerService.java

@@ -0,0 +1,158 @@
+/*
+ * Copyright (c) 2011-2015 CyanogenMod Project
+ *
+ * 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.
+ */
+
+package org.cyanogenmod.platform.internal;
+
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import android.os.IBinder;
+
+import android.os.IPowerManager;
+import android.os.RemoteException;
+import android.os.ServiceManager;
+import android.os.UserHandle;
+import android.provider.Settings;
+import android.telephony.TelephonyManager;
+import android.util.Log;
+import com.android.server.SystemService;
+import cyanogenmod.app.CMContextConstants;
+import cyanogenmod.app.ISettingsManager;
+import cyanogenmod.app.SettingsManager;
+
+import java.io.ByteArrayInputStream;
+import java.security.PublicKey;
+import java.security.cert.CertificateException;
+import java.security.cert.CertificateFactory;
+import java.security.cert.X509Certificate;
+import java.security.interfaces.RSAPublicKey;
+
+/** {@hide} */
+public class SettingsManagerService extends SystemService {
+
+    private static final String TAG = "CMSettingsService";
+
+    private Context mContext;
+    private TelephonyManager mTelephonyManager;
+
+    public SettingsManagerService(Context context) {
+        super(context);
+        mContext = context;
+        publishBinderService(CMContextConstants.CM_SETTINGS_SERVICE, mService);
+    }
+
+    @Override
+    public void onStart() {
+        mTelephonyManager = (TelephonyManager)
+                mContext.getSystemService(Context.TELEPHONY_SERVICE);
+    }
+
+    private void enforceModifyNetworkSettingsPermission() {
+        mContext.enforceCallingOrSelfPermission(SettingsManager.MODIFY_NETWORK_SETTINGS_PERMISSION,
+                "You do not have permissions to change system network settings.");
+    }
+
+    private void enforceShutdownPermission() {
+        mContext.enforceCallingOrSelfPermission(android.Manifest.permission.REBOOT,
+                "You do not have permissions to shut down the device.");
+    }
+
+    private final IBinder mService = new ISettingsManager.Stub() {
+
+        @Override
+        public void setAirplaneModeEnabled(boolean enabled) {
+            enforceModifyNetworkSettingsPermission();
+            /*
+             * We need to clear the caller's identity in order to
+             *   allow this method call to modify settings
+             *   not allowed by the caller's permissions.
+             */
+            long token = clearCallingIdentity();
+            setAirplaneModeEnabledInternal(enabled);
+            restoreCallingIdentity(token);
+        }
+
+        @Override
+        public void setMobileDataEnabled(boolean enabled) {
+            enforceModifyNetworkSettingsPermission();
+            /*
+             * We need to clear the caller's identity in order to
+             *   allow this method call to modify settings
+             *   not allowed by the caller's permissions.
+             */
+            long token = clearCallingIdentity();
+            setMobileDataEnabledInternal(enabled);
+            restoreCallingIdentity(token);
+        }
+
+        @Override
+        public void shutdown() {
+            enforceShutdownPermission();
+            /*
+             * We need to clear the caller's identity in order to
+             *   allow this method call to modify settings
+             *   not allowed by the caller's permissions.
+             */
+            long token = clearCallingIdentity();
+            shutdownInternal(false);
+            restoreCallingIdentity(token);
+        }
+
+        @Override
+        public void reboot() {
+            enforceShutdownPermission();
+            /*
+             * We need to clear the caller's identity in order to
+             *   allow this method call to modify settings
+             *   not allowed by the caller's permissions.
+             */
+            long token = clearCallingIdentity();
+            shutdownInternal(true);
+            restoreCallingIdentity(token);
+        }
+    };
+
+    private void setAirplaneModeEnabledInternal(boolean enabled) {
+        // Change the system setting
+        Settings.Global.putInt(mContext.getContentResolver(), Settings.Global.AIRPLANE_MODE_ON,
+                enabled ? 1 : 0);
+
+        // Post the intent
+        Intent intent = new Intent(Intent.ACTION_AIRPLANE_MODE_CHANGED);
+        intent.putExtra("state", enabled);
+        mContext.sendBroadcastAsUser(intent, UserHandle.ALL);
+    }
+
+    private void setMobileDataEnabledInternal(boolean enabled) {
+        mTelephonyManager.setDataEnabled(enabled);
+    }
+
+    private void shutdownInternal(boolean reboot) {
+        IPowerManager pm = IPowerManager.Stub.asInterface(
+                        ServiceManager.getService(Context.POWER_SERVICE));
+        try {
+            if (reboot) {
+                pm.reboot(false, null, false);
+            } else {
+                pm.shutdown(false, false);
+            }
+        } catch (RemoteException e) {
+            Log.d(TAG, "Unable to shutdown.");
+        }
+    }
+}
+

cm/res/AndroidManifest.xml

@@ -35,6 +35,13 @@
                 android:icon="@drawable/ic_launcher_cyanogenmod"
                 android:protectionLevel="normal" />
 
+    <!-- Allows system applications to make changes to a subset of system network settings -->
+    <permission android:name="cyanogenmod.permission.MODIFY_NETWORK_SETTINGS"
+                android:label="@string/permlab_modifyNetworkSettings"
+                android:description="@string/permdesc_modifyNetworkSettings"
+                android:icon="@drawable/ic_launcher_cyanogenmod"
+                android:protectionLevel="system|signature" />
+
     <application android:process="system"
                  android:persistent="true"
                  android:hasCode="false"

cm/res/res/values/strings.xml

@@ -21,6 +21,9 @@
     <string name="permlab_publishCustomTile">create a custom tile within quick settings panel</string>
     <string name="permdesc_publishCustomTile">Allows an app to publish a quick settings tile.</string>
 
+    <string name="permlab_modifyNetworkSettings">change system network settings</string>
+    <string name="permdesc_modifyNetworkSettings">Allows an app to make changes to a restricted set of system network settings.</string>
+
     <string name="permlab_bindCustomTileListenerService">bind to a custom tile listener service</string>
     <string name="permdesc_bindCustomTileListenerService">Allows the app to bind to the top-level interface of a custom tile listener service.</string>
 

src/java/cyanogenmod/app/CMContextConstants.java

@@ -50,4 +50,15 @@ private CMContextConstants() {
      * @hide
      */
     public static final String CM_PROFILE_SERVICE = "profile";
+
+    /**
+     * Use with {@link android.content.Context#getSystemService} to retrieve a
+     * {@link cyanogenmod.app.SettingsManager} changing system settings.
+     *
+     * @see android.content.Context#getSystemService
+     * @see cyanogenmod.app.SettingsManager
+     *
+     * @hide
+     */
+    public static final String CM_SETTINGS_SERVICE = "cmsettings";
 }

src/java/cyanogenmod/app/ISettingsManager.aidl

@@ -0,0 +1,27 @@
+/* //device/java/android/android/app/IProfileManager.aidl
+**
+** Copyright (C) 2015 The CyanogenMod Project
+**
+** 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.
+*/
+
+package cyanogenmod.app;
+
+/** {@hide} */
+interface ISettingsManager
+{
+    void setAirplaneModeEnabled(boolean enabled);
+    void setMobileDataEnabled(boolean enabled);
+    void shutdown();
+    void reboot();
+}