Add util methods for WorkPolicy in SettingsLib

Moving logic for WorkPolicyInfo to SettingLib so that they can be
accessed from PermissionController

Bug: b/229889270
Test: manual
Change-Id: I282a4e05791a8d738795999ca5c3ab68e0cd0985

1 files changed, 159 insertions, 0 deletions

diff --git a/packages/SettingsLib/Utils/src/com/android/settingslib/utils/WorkPolicyUtils.java b/packages/SettingsLib/Utils/src/com/android/settingslib/utils/WorkPolicyUtils.java
new file mode 100644
index 000000000000..b038d59e9fe4
--- /dev/null
+++ b/packages/SettingsLib/Utils/src/com/android/settingslib/utils/WorkPolicyUtils.java
@@ -0,0 +1,159 @@
+/*
+ * Copyright (C) 2022 The Android Open Source 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 com.android.settingslib.utils;
+
+
+import android.app.admin.DevicePolicyManager;
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
+import android.os.UserHandle;
+import android.os.UserManager;
+import android.provider.Settings;
+
+import java.util.List;
+
+/**
+ * Utility class for find out when to show WorkPolicyInfo
+ */
+public class WorkPolicyUtils {
+
+    Context mContext;
+    PackageManager mPackageManager;
+    UserManager mUserManager;
+    DevicePolicyManager mDevicePolicyManager;
+
+    private static final int USER_NULL = -10000;
+
+    public WorkPolicyUtils(
+            Context applicationContext,
+            PackageManager mPm,
+            UserManager mUm,
+            DevicePolicyManager mDpm
+    ) {
+        mContext = applicationContext;
+        mPackageManager = mPm;
+        mUserManager = mUm;
+        mDevicePolicyManager = mDpm;
+    }
+
+    /**
+     * Returns {@code true} if it is possilbe to resolve an Intent to launch the "Your work policy
+     * info" page provided by the active Device Owner or Profile Owner app if it exists, {@code
+     * false} otherwise.
+     */
+    public boolean hasWorkPolicy() {
+        return getWorkPolicyInfoIntentDO() != null || getWorkPolicyInfoIntentPO() != null;
+    }
+
+    /**
+     * Launches the Device Owner or Profile Owner's activity that displays the "Your work policy
+     * info" page. Returns {@code true} if the activity has indeed been launched.
+     */
+    public boolean showWorkPolicyInfo(Context activityContext) {
+        Intent intent = getWorkPolicyInfoIntentDO();
+        if (intent != null) {
+            activityContext.startActivity(intent);
+            return true;
+        }
+
+        intent = getWorkPolicyInfoIntentPO();
+        final int userId = getManagedProfileUserId();
+        if (intent != null && userId != USER_NULL) {
+            activityContext.startActivityAsUser(intent, UserHandle.of(userId));
+            return true;
+        }
+
+        return false;
+    }
+
+    private Intent getWorkPolicyInfoIntentDO() {
+        final ComponentName ownerComponent = getDeviceOwnerComponent();
+        if (ownerComponent == null) {
+            return null;
+        }
+
+        // Only search for the required action in the Device Owner's package
+        final Intent intent =
+                new Intent(Settings.ACTION_SHOW_WORK_POLICY_INFO)
+                        .setPackage(ownerComponent.getPackageName());
+        final List<ResolveInfo> activities = mPackageManager.queryIntentActivities(intent, 0);
+        if (activities.size() != 0) {
+            return intent;
+        }
+
+        return null;
+    }
+
+    private Intent getWorkPolicyInfoIntentPO() {
+        try {
+            final int managedUserId = getManagedProfileUserId();
+            if (managedUserId == USER_NULL) {
+                return null;
+            }
+
+            Context managedProfileContext =
+                    mContext.createPackageContextAsUser(
+                            mContext.getPackageName(), 0, UserHandle.of(managedUserId)
+                    );
+
+            DevicePolicyManager managedProfileDevicePolicyManager =
+                    (DevicePolicyManager)
+                            managedProfileContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
+            ComponentName ownerComponent = managedProfileDevicePolicyManager.getProfileOwner();
+            if (ownerComponent == null) {
+                return null;
+            }
+
+            // Only search for the required action in the Profile Owner's package
+            final Intent intent =
+                    new Intent(Settings.ACTION_SHOW_WORK_POLICY_INFO)
+                            .setPackage(ownerComponent.getPackageName());
+            final List<ResolveInfo> activities =
+                    mPackageManager.queryIntentActivitiesAsUser(
+                            intent, 0, UserHandle.of(managedUserId));
+            if (activities.size() != 0) {
+                return intent;
+            }
+
+            return null;
+        } catch (PackageManager.NameNotFoundException e) {
+            return null;
+        }
+    }
+
+    private ComponentName getDeviceOwnerComponent() {
+        if (!mPackageManager.hasSystemFeature(PackageManager.FEATURE_DEVICE_ADMIN)) {
+            return null;
+        }
+        return mDevicePolicyManager.getDeviceOwnerComponentOnAnyUser();
+    }
+
+    private int getManagedProfileUserId() {
+        List<UserHandle> allProfiles = mUserManager.getAllProfiles();
+        for (UserHandle uh : allProfiles) {
+            int id = uh.getIdentifier();
+            if (mUserManager.isManagedProfile(id)) {
+                return id;
+            }
+        }
+        return USER_NULL;
+    }
+
+}