MDM Incognito Mode Restriction

Implements handling of MDM enforced restriction preventing the user
from opening an incognito tab.

When enforced by MDM, the Incognito button on the tabs screen
is greyed out, and if tapped, presents a toast message informing
the user that the setting is managed by the administrator.

This commit includes basic unit tests.

Change-Id: I26fcf10cc954f63c8e4489dbac9ff148e90b0c94

3 files changed, 204 insertions, 1 deletions

diff --git a/src/com/android/browser/NavScreen.java b/src/com/android/browser/NavScreen.java
index 9e32f49c..76d0703f 100644
--- a/src/com/android/browser/NavScreen.java
+++ b/src/com/android/browser/NavScreen.java
@@ -33,8 +33,10 @@ import android.widget.LinearLayout;
 import android.widget.PopupMenu;
 import android.widget.PopupMenu.OnMenuItemClickListener;
 import android.widget.RelativeLayout;
+import android.widget.Toast;
 
 import com.android.browser.NavTabScroller.OnRemoveListener;
+import com.android.browser.mdm.IncognitoRestriction;
 
 import java.util.HashMap;
 
@@ -107,12 +109,15 @@ public class NavScreen extends RelativeLayout
                 mUiController.getTabControl().getTabPosition(mUi.getActiveTab()));
     }
 
+
+
     private void init() {
         LayoutInflater.from(getContext()).inflate(R.layout.nav_screen, this);
         setContentDescription(getContext().getResources().getString(
                 R.string.accessibility_transition_navscreen));
         mToolbarLayout = findViewById(R.id.nav_toolbar_animate);
         mNewIncognitoTab = (ImageButton) findViewById(R.id.newincognitotab);
+        IncognitoRestriction.getInstance().registerButton(mNewIncognitoTab);
         mNewTab = (ImageButton) findViewById(R.id.newtab);
         mMore = (ImageButton) findViewById(R.id.more);
         mNewIncognitoTab.setOnClickListener(this);
@@ -144,7 +149,11 @@ public class NavScreen extends RelativeLayout
         if (mNewTab == v) {
             openNewTab();
         } else if (mNewIncognitoTab == v) {
-            openNewIncognitoTab();
+            if (IncognitoRestriction.getInstance().isEnabled()) {
+                Toast.makeText(getContext(), R.string.mdm_managed_alert, Toast.LENGTH_SHORT).show();
+            } else {
+                openNewIncognitoTab();
+            }
         } else if (mMore == v) {
             showPopupMenu();
         }
diff --git a/src/com/android/browser/mdm/IncognitoRestriction.java b/src/com/android/browser/mdm/IncognitoRestriction.java
new file mode 100644
index 00000000..eb62cd3c
--- /dev/null
+++ b/src/com/android/browser/mdm/IncognitoRestriction.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of The Linux Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package com.android.browser.mdm;
+
+import android.os.Bundle;
+import android.widget.ImageButton;
+
+public class IncognitoRestriction extends Restriction {
+
+    private final static String TAG = "IncognitoRestriction";
+
+    public static final String INCOGNITO_RESTRICTION_ENABLED = "IncognitoRestrictionEnabled"; // boolean
+
+    private static IncognitoRestriction sInstance;
+    private ImageButton mIncogButton = null;
+
+    private IncognitoRestriction() {
+        super();
+    }
+
+    public static IncognitoRestriction getInstance() {
+        synchronized (IncognitoRestriction.class) {
+            if (sInstance == null) {
+                sInstance = new IncognitoRestriction();
+            }
+        }
+        return sInstance;
+    }
+
+    @Override
+    public void enforce(Bundle restrictions) {
+        enable(restrictions.getBoolean(INCOGNITO_RESTRICTION_ENABLED, false));
+        updateButton();
+    }
+
+    public void registerButton (ImageButton ib) {
+        mIncogButton = ib;
+        updateButton();
+    }
+
+    private void updateButton() {
+        if (null != mIncogButton) {
+            mIncogButton.setAlpha((float) (isEnabled() ? 0.5 : 1.0));
+        }
+    }
+
+    // For testing
+    public float getButtonAlpha() {
+        return mIncogButton != null ? mIncogButton.getAlpha() : (float) 1.0;
+    }
+}
diff --git a/src/com/android/browser/mdm/tests/IncognitoRestrictionsTest.java b/src/com/android/browser/mdm/tests/IncognitoRestrictionsTest.java
new file mode 100644
index 00000000..e58d64cd
--- /dev/null
+++ b/src/com/android/browser/mdm/tests/IncognitoRestrictionsTest.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright (c) 2015, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ * * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ * * Neither the name of The Linux Foundation nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+package com.android.browser.mdm.tests;
+
+import android.app.Instrumentation;
+import android.os.Bundle;
+import android.test.ActivityInstrumentationTestCase2;
+
+import com.android.browser.BrowserActivity;
+import com.android.browser.mdm.IncognitoRestriction;
+import com.android.browser.mdm.ManagedProfileManager;
+
+public class IncognitoRestrictionsTest extends ActivityInstrumentationTestCase2<BrowserActivity> {
+
+    private final static String TAG = "IncognitoRestrictionsTest";
+
+    private Instrumentation mInstrumentation;
+    private BrowserActivity mActivity;
+    private IncognitoRestriction mIncognitoRestriction;
+
+    public IncognitoRestrictionsTest() {
+        super(BrowserActivity.class);
+    }
+
+    @Override
+    protected void setUp() throws Exception {
+        super.setUp();
+        mInstrumentation = getInstrumentation();
+        mActivity = getActivity();
+        mIncognitoRestriction = IncognitoRestriction.getInstance();
+    }
+
+    public void test_IncognitoRestriction() throws Throwable {
+        // Possible states
+        //  enabled  | button enabled
+        //  ---------------------------------
+        //  not set  |   Yes
+        //  true     |   No
+        //  false    |   Yes
+
+        clearIncognitoRestrictions();
+        assertFalse(mIncognitoRestriction.isEnabled());
+        assertEquals((float) 1.0, mIncognitoRestriction.getButtonAlpha());
+
+        setIncognitoRestrictions(true);
+        assertTrue(mIncognitoRestriction.isEnabled());
+        assertEquals((float) 0.5, mIncognitoRestriction.getButtonAlpha());
+
+        setIncognitoRestrictions(false);
+        assertFalse(mIncognitoRestriction.isEnabled());
+        assertEquals((float) 1.0, mIncognitoRestriction.getButtonAlpha());
+    }
+
+    /**
+    * Activate Incognito restriction
+     * @param clear    if true, sends an empty bundle
+     * @param enabled  Required. true or false
+    *
+    */
+    private void setIncognitoRestrictions(boolean clear, boolean enabled) {
+        final Bundle restrictions = new Bundle();
+
+        if (!clear) {
+            restrictions.putBoolean(IncognitoRestriction.INCOGNITO_RESTRICTION_ENABLED, enabled);
+        }
+
+        // Deliver restriction on UI thread
+        mActivity.runOnUiThread(new Runnable() {
+            @Override
+            public void run() {
+                ManagedProfileManager.getInstance().setMdmRestrictions(restrictions);
+            }
+        });
+
+        // Wait to ensure restriction is set
+        mInstrumentation.waitForIdleSync();
+    }
+
+    private void clearIncognitoRestrictions() {
+        setIncognitoRestrictions(true, false);
+    }
+
+    private void setIncognitoRestrictions(boolean enabled) {
+        setIncognitoRestrictions(false, enabled);
+    }
+
+}