Password expiration settings for TestDPC

Change-Id: I4f7935239b2c1e4a501c7176b9f37accc66a81e7

Author: hex539

app/src/main/java/com/afwsamples/testdpc/DeviceAdminReceiver.java

@@ -38,6 +38,7 @@
 import android.widget.Toast;
 
 import com.afwsamples.testdpc.common.LaunchIntentUtil;
+import com.afwsamples.testdpc.common.Util;
 import com.afwsamples.testdpc.cosu.EnableCosuActivity;
 import com.afwsamples.testdpc.syncauth.FinishSyncAuthDeviceOwnerActivity;
 import com.afwsamples.testdpc.syncauth.FinishSyncAuthProfileOwnerActivity;
@@ -236,6 +237,23 @@ public static ComponentName getComponentName(Context context) {
         return new ComponentName(context.getApplicationContext(), DeviceAdminReceiver.class);
     }
 
+    @Override
+    public void onPasswordExpiring(Context context, Intent intent) {
+        DevicePolicyManager devicePolicyManager = (DevicePolicyManager) context.getSystemService(
+                Context.DEVICE_POLICY_SERVICE);
+
+        final long timeNow = System.currentTimeMillis();
+        final long timeAdminExpires =
+                devicePolicyManager.getPasswordExpiration(getComponentName(context));
+        final boolean expiredBySelf = (timeNow >= timeAdminExpires && timeAdminExpires != 0);
+
+        Util.showNotification(context, R.string.password_expired_title,
+                context.getString(expiredBySelf
+                        ? R.string.password_expired_by_self
+                        : R.string.password_expired_by_others),
+                Util.PASSWORD_EXPIRATION_NOTIFICATION_ID);
+    }
+
     @Override
     public void onPasswordFailed(Context context, Intent intent) {
         DevicePolicyManager devicePolicyManager = (DevicePolicyManager) context.getSystemService(

app/src/main/java/com/afwsamples/testdpc/common/Util.java

@@ -19,6 +19,7 @@
 import android.app.Notification;
 import android.app.NotificationManager;
 import android.content.Context;
+import android.text.format.DateUtils;
 
 import com.afwsamples.testdpc.R;
 
@@ -27,6 +28,8 @@
  */
 public class Util {
 
+    public static final int PASSWORD_EXPIRATION_NOTIFICATION_ID = 2;
+
     public static void showNotification(Context context, int titleId, String msg,
             int notificationId) {
         NotificationManager mNotificationManager =
@@ -39,4 +42,23 @@ public static void showNotification(Context context, int titleId, String msg,
                 .build();
         mNotificationManager.notify(notificationId, notification);
     }
+
+    /**
+     * Format a friendly datetime for the current locale according to device policy documentation.
+     * If the timestamp doesn't represent a real date, it will be interpreted as {@code null}.
+     *
+     * @return A {@link CharSequence} such as "12:35 PM today" or "June 15, 2033", or {@code null}
+     * in the case that {@param timestampMs} equals zero.
+     */
+    public static CharSequence formatTimestamp(long timestampMs) {
+        if (timestampMs == 0) {
+            // DevicePolicyManager documentation describes this timestamp as having no effect,
+            // so show nothing for this case as the policy has not been set.
+            return null;
+        }
+
+        return DateUtils.formatSameDayTime(timestampMs, System.currentTimeMillis(),
+                DateUtils.FORMAT_SHOW_WEEKDAY, DateUtils.FORMAT_SHOW_TIME);
+    }
+
 }

app/src/main/java/com/afwsamples/testdpc/policy/keyguard/PasswordConstraintsFragment.java

@@ -30,10 +30,12 @@
 
 import com.afwsamples.testdpc.DeviceAdminReceiver;
 import com.afwsamples.testdpc.R;
+import com.afwsamples.testdpc.common.Util;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.TreeMap;
+import java.util.concurrent.TimeUnit;
 
 /**
  * This fragment provides functionalities to set password constraint policies as a profile
@@ -67,6 +69,9 @@ private ComponentName getAdmin() {
     }
 
     abstract static class Keys {
+        final static String EXPIRATION_TIME = "password_expiration_time";
+        final static String EXPIRATION_BY_ALL = "password_expiration_aggregate";
+
         final static String QUALITY = "minimum_password_quality";
 
         final static String MIN_LENGTH = "password_min_length";
@@ -131,6 +136,9 @@ public void onCreate(Bundle savedInstanceState) {
         quality.setEntries(entries.toArray(new CharSequence[0]));
         quality.setEntryValues(values.toArray(new CharSequence[0]));
 
+        // Expiration times.
+        setup(Keys.EXPIRATION_TIME, null);
+
         // Minimum quality requirement.
         setup(Keys.QUALITY, PASSWORD_QUALITIES.floorKey(getDpm().getPasswordQuality(getAdmin())));
 
@@ -144,6 +152,14 @@ public void onCreate(Bundle savedInstanceState) {
         setup(Keys.MIN_NONLETTER, getDpm().getPasswordMinimumNonLetter(getAdmin()));
     }
 
+    @Override
+    public void onResume() {
+        super.onResume();
+
+        // Settings that may have been changed by other users need updating.
+        updateExpirationTimes();
+    }
+
     @Override
     public boolean onPreferenceChange(Preference preference, Object newValue) {
         final int value;
@@ -162,6 +178,11 @@ public boolean onPreferenceChange(Preference preference, Object newValue) {
         CharSequence summary = newValue.toString();
 
         switch (preference.getKey()) {
+            case Keys.EXPIRATION_TIME: {
+                getDpm().setPasswordExpirationTimeout(getAdmin(), TimeUnit.SECONDS.toMillis(value));
+                updateExpirationTimes();
+                return true;
+            }
             case Keys.QUALITY: {
                 final ListPreference list = (ListPreference) preference;
                 // Store newValue now so getEntry() can return the new setting
@@ -225,6 +246,17 @@ private void setup(String key, Object adminSetting) {
         field.setSummary(summary);
     }
 
+    /**
+     * Refresh summaries for settings related to the next password expiration.
+     */
+    private void updateExpirationTimes() {
+        final Preference byAdmin = findPreference(Keys.EXPIRATION_TIME);
+        final Preference byAll = findPreference(Keys.EXPIRATION_BY_ALL);
+
+        byAdmin.setSummary(Util.formatTimestamp(getDpm().getPasswordExpiration(getAdmin())));
+        byAll.setSummary(Util.formatTimestamp(getDpm().getPasswordExpiration(null)));
+    }
+
     /**
      * Notify the admin receiver that something about the password has changed - in this context,
      * a minimum password requirement policy.

app/src/main/res/values/strings.xml

@@ -480,6 +480,14 @@
     <string name="password_not_compliant_title">Password is not compliant</string>
     <string name="password_not_compliant_content">Touch to set a new lock screen password.</string>
 
+    <string name="password_expiration">Password expiration</string>
+    <string name="password_expiration_seconds">Password expiration (seconds)</string>
+    <string name="password_expiration_aggregate">Expiration by all/other admins</string>
+
+    <string name="password_expired_title">Password has expired</string>
+    <string name="password_expired_by_self">According to a policy set by TestDPC.</string>
+    <string name="password_expired_by_others">According to a policy set by another admin.</string>
+
     <plurals name="password_failed_attempts_title">
         <item quantity="one">Password entered incorrectly %d time</item>
         <item quantity="other">Password entered incorrectly %d times</item>

app/src/main/res/xml/password_constraint_preferences.xml

@@ -17,6 +17,19 @@
 
 <PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android">
 
+    <PreferenceCategory android:title="@string/password_expiration">
+        <EditTextPreference
+                android:title="@string/password_expiration_seconds"
+                android:key="password_expiration_time"
+                android:inputType="number"/>
+
+        <!-- Not a real preference- shows the aggregate password expiration time for all admins. -->
+        <Preference
+                android:title="@string/password_expiration_aggregate"
+                android:key="password_expiration_aggregate"
+                android:selectable="false"/>
+    </PreferenceCategory>
+
     <PreferenceCategory android:title="@string/password_constraints">
         <ListPreference
                 android:title="@string/minimum_password_quality"