Add support for per-package policy for sending premium SMS.

The default behavior for sending a message to a premium SMS
short code (or suspected premium SMS number) is to ask the user for
confirmation. Enable the user to set a default policy ("remember this
choice" checkbox) to always/never allow the app to send SMS to
premium short codes in the future. The policy can be changed by
the Settings app in the app info screen.

Bug: 5513975
Change-Id: I93053fef1524ee7772cc87364c760cb3dbf01ad7

res/layout/installed_app_details.xml

@@ -393,6 +393,27 @@
                 style="?android:attr/listSeparatorTextViewStyle"
                 android:layout_marginTop="8dip"
                 android:text="@string/permissions_label" />
+            <TextView android:id="@+id/security_settings_billing_desc"
+                android:text="@string/security_settings_billing_desc"
+                android:textAppearance="?android:attr/textAppearanceSmall"
+                android:paddingTop="6dip"
+                android:paddingStart="6dip"
+                android:paddingBottom="6dip"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+            <LinearLayout
+                android:id="@+id/security_settings_billing_list"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:orientation="vertical">
+                <TextView
+                    android:text="@string/security_settings_premium_sms_desc" />
+                <Spinner
+                    android:id="@+id/security_settings_premium_sms_list"
+                    android:layout_width="fill_parent"
+                    android:layout_height="wrap_content"
+                    android:spinnerMode="dropdown" />
+            </LinearLayout>
             <TextView android:id="@+id/security_settings_desc"
                 android:text="@string/security_settings_desc"
                 android:textAppearance="?android:attr/textAppearanceSmall"

res/values/arrays.xml

@@ -746,4 +746,14 @@
         <item>2</item>
         <item>1</item>
     </string-array>
+
+    <!-- Values for premium SMS permission selector [CHAR LIMIT=30] -->
+    <string-array name="security_settings_premium_sms_values">
+        <!-- Ask user before sending to premium SMS short code. -->
+        <item>Ask</item>
+        <!-- Never allow app to send to premium SMS short code. -->
+        <item>Never allow</item>
+        <!-- Always allow app to send to premium SMS short code. -->
+        <item>Always allow</item>
+    </string-array>
 </resources>

res/values/strings.xml

@@ -2559,6 +2559,10 @@
     <string name="join_many_items_first"><xliff:g id="first_item">%1$s</xliff:g>, <xliff:g id="all_but_first_and_last_item">%2$s</xliff:g></string>
     <!-- [CHAR_LIMIT=NONE] Format to put the middle items together in a series of 4 or more items in a list -->
     <string name="join_many_items_middle"><xliff:g id="added_item">%1$s</xliff:g>, <xliff:g id="rest_of_items">%2$s</xliff:g></string>
+    <!-- Manage applications, individual application info screen, text that appears under the "Permissions" heading after the app has tried to send to a premium SMS. [CHAR LIMIT=50] -->
+    <string name="security_settings_billing_desc">This app may charge you money:</string>
+    <!-- Manage applications, text for permission to send to premium SMS short codes. [CHAR LIMIT=40] -->
+    <string name="security_settings_premium_sms_desc">Send premium SMS</string>
     <string name="computing_size">Computing\u2026</string>
     <string name="invalid_size_value">Couldn\'t compute package size.</string>
     <!-- String displayed when list is empty -->

src/com/android/settings/applications/InstalledAppDetails.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.applications;
 
+import com.android.internal.telephony.ISms;
+import com.android.internal.telephony.SmsUsageMonitor;
 import com.android.settings.R;
 import com.android.settings.Utils;
 import com.android.settings.applications.ApplicationsState.AppEntry;
@@ -66,12 +68,15 @@ import java.util.List;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.AdapterView;
 import android.widget.AppSecurityPermissions;
+import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
+import android.widget.Spinner;
 import android.widget.TextView;
 
 /**
@@ -96,6 +101,7 @@ public class InstalledAppDetails extends Fragment
     private IUsbManager mUsbManager;
     private AppWidgetManager mAppWidgetManager;
     private DevicePolicyManager mDpm;
+    private ISms mSmsManager;
     private ApplicationsState mState;
     private ApplicationsState.Session mSession;
     private ApplicationsState.AppEntry mAppEntry;
@@ -371,6 +377,7 @@ public class InstalledAppDetails extends Fragment
         mUsbManager = IUsbManager.Stub.asInterface(b);
         mAppWidgetManager = AppWidgetManager.getInstance(getActivity());
         mDpm = (DevicePolicyManager)getActivity().getSystemService(Context.DEVICE_POLICY_SERVICE);
+        mSmsManager = ISms.Stub.asInterface(ServiceManager.getService("isms"));
 
         mCanBeOnSdCardChecker = new CanBeOnSdCardChecker();
     }
@@ -595,8 +602,43 @@ public class InstalledAppDetails extends Fragment
         // Security permissions section
         LinearLayout permsView = (LinearLayout) mRootView.findViewById(R.id.permissions_section);
         AppSecurityPermissions asp = new AppSecurityPermissions(getActivity(), packageName);
-        if (asp.getPermissionCount() > 0) {
+        int premiumSmsPermission = getPremiumSmsPermission(packageName);
+        // Premium SMS permission implies the app also has SEND_SMS permission, so the original
+        // application permissions list doesn't have to be shown/hidden separately. The premium
+        // SMS subsection should only be visible if the app has tried to send to a premium SMS.
+        if (asp.getPermissionCount() > 0
+                || premiumSmsPermission != SmsUsageMonitor.PREMIUM_SMS_PERMISSION_UNKNOWN) {
             permsView.setVisibility(View.VISIBLE);
+        } else {
+            permsView.setVisibility(View.GONE);
+        }
+        // Premium SMS permission subsection
+        TextView securityBillingDesc = (TextView) permsView.findViewById(
+                R.id.security_settings_billing_desc);
+        LinearLayout securityBillingList = (LinearLayout) permsView.findViewById(
+                R.id.security_settings_billing_list);
+        if (premiumSmsPermission != SmsUsageMonitor.PREMIUM_SMS_PERMISSION_UNKNOWN) {
+            // Show the premium SMS permission selector
+            securityBillingDesc.setVisibility(View.VISIBLE);
+            securityBillingList.setVisibility(View.VISIBLE);
+            Spinner spinner = (Spinner) permsView.findViewById(
+                    R.id.security_settings_premium_sms_list);
+            ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(getActivity(),
+                    R.array.security_settings_premium_sms_values,
+                    android.R.layout.simple_spinner_item);
+            adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
+            spinner.setAdapter(adapter);
+            // List items are in the same order as SmsUsageMonitor constants, offset by 1.
+            spinner.setSelection(premiumSmsPermission - 1);
+            spinner.setOnItemSelectedListener(new PremiumSmsSelectionListener(
+                    packageName, mSmsManager));
+        } else {
+            // Hide the premium SMS permission selector
+            securityBillingDesc.setVisibility(View.GONE);
+            securityBillingList.setVisibility(View.GONE);
+        }
+        // App permissions subsection
+        if (asp.getPermissionCount() > 0) {
             // Make the security sections header visible
             LinearLayout securityList = (LinearLayout) permsView.findViewById(
                     R.id.security_settings_list);
@@ -642,8 +684,6 @@ public class InstalledAppDetails extends Fragment
                             mPackageInfo.applicationInfo.loadLabel(mPm), appListStr));
                 }
             }
-        } else {
-            permsView.setVisibility(View.GONE);
         }
         
         checkForceStop();
@@ -653,6 +693,42 @@ public class InstalledAppDetails extends Fragment
         return true;
     }
 
+    private static class PremiumSmsSelectionListener implements AdapterView.OnItemSelectedListener {
+        private final String mPackageName;
+        private final ISms mSmsManager;
+
+        PremiumSmsSelectionListener(String packageName, ISms smsManager) {
+            mPackageName = packageName;
+            mSmsManager = smsManager;
+        }
+
+        @Override
+        public void onItemSelected(AdapterView<?> parent, View view, int position,
+                long id) {
+            if (position >= 0 && position < 3) {
+                Log.d(TAG, "Selected premium SMS policy " + position);
+                setPremiumSmsPermission(mPackageName, (position + 1));
+            } else {
+                Log.e(TAG, "Error: unknown premium SMS policy " + position);
+            }
+        }
+
+        @Override
+        public void onNothingSelected(AdapterView<?> parent) {
+            // Ignored
+        }
+
+        private void setPremiumSmsPermission(String packageName, int permission) {
+            try {
+                if (mSmsManager != null) {
+                    mSmsManager.setPremiumSmsPermission(packageName, permission);
+                }
+            } catch (RemoteException ex) {
+                // ignored
+            }
+        }
+    }
+    
     private void resetLaunchDefaultsUi(TextView title, TextView autoLaunchView) {
         title.setText(R.string.auto_launch_label);
         autoLaunchView.setText(R.string.auto_launch_disable_text);
@@ -1027,6 +1103,17 @@ public class InstalledAppDetails extends Fragment
         }
     }
 
+    private int getPremiumSmsPermission(String packageName) {
+        try {
+            if (mSmsManager != null) {
+                return mSmsManager.getPremiumSmsPermission(packageName);
+            }
+        } catch (RemoteException ex) {
+            // ignored
+        }
+        return SmsUsageMonitor.PREMIUM_SMS_PERMISSION_UNKNOWN;
+    }
+
     /*
      * Method implementing functionality of buttons clicked
      * @see android.view.View.OnClickListener#onClick(android.view.View)