Create deviceowner gated APIs for creating and removing users in devicepolicymanager.

This will allow DMAgent to manage users for EDU's cart model user case.
Bug: 15015887

Change-Id: I1eadf1701cb75fc4b50eb1a0df1525eff818286e
(cherry picked from commit be9f43b9618ec25121b151d247eb0285fb6554b3)

api/current.txt

@@ -5106,6 +5106,7 @@ package android.app.admin {
     method public void clearForwardingIntentFilters(android.content.ComponentName);
     method public void clearPackagePersistentPreferredActivities(android.content.ComponentName, java.lang.String);
     method public void clearUserRestriction(android.content.ComponentName, java.lang.String);
+    method public android.os.UserHandle createUser(android.content.ComponentName, java.lang.String);
     method public void enableSystemApp(android.content.ComponentName, java.lang.String);
     method public int enableSystemApp(android.content.ComponentName, android.content.Intent);
     method public java.lang.String[] getAccountTypesWithManagementDisabled();
@@ -5139,6 +5140,7 @@ package android.app.admin {
     method public boolean isProfileOwnerApp(java.lang.String);
     method public void lockNow();
     method public void removeActiveAdmin(android.content.ComponentName);
+    method public boolean removeUser(android.content.ComponentName, android.os.UserHandle);
     method public boolean resetPassword(java.lang.String, int);
     method public void setAccountManagementDisabled(android.content.ComponentName, java.lang.String, boolean);
     method public boolean setApplicationBlocked(android.content.ComponentName, java.lang.String, boolean);

core/java/android/app/admin/DevicePolicyManager.java

@@ -32,6 +32,7 @@ import android.os.RemoteCallback;
 import android.os.RemoteException;
 import android.os.ServiceManager;
 import android.os.UserHandle;
+import android.os.UserManager;
 import android.provider.Settings;
 import android.service.trust.TrustAgentService;
 import android.util.Log;
@@ -1982,6 +1983,43 @@ public class DevicePolicyManager {
         }
     }
 
+    /**
+     * Called by a device owner to create a user with the specified name. The UserHandle returned
+     * by this method should not be persisted as user handles are recycled as users are removed and
+     * created. If you need to persist an identifier for this user, use
+     * {@link UserManager#getSerialNumberForUser}.
+     *
+     * @param admin Which {@link DeviceAdminReceiver} this request is associated with.
+     * @param name the user's name
+     * @see UserHandle
+     * @return the UserHandle object for the created user, or null if the user could not be created.
+     */
+    public UserHandle createUser(ComponentName admin, String name) {
+        try {
+            return mService.createUser(admin, name);
+        } catch (RemoteException re) {
+            Log.w(TAG, "Could not create a user", re);
+        }
+        return null;
+    }
+
+    /**
+     * Called by a device owner to remove a user and all associated data. The primary user can
+     * not be removed.
+     *
+     * @param admin Which {@link DeviceAdminReceiver} this request is associated with.
+     * @param userHandle the user to remove.
+     * @return {@code true} if the user was removed, {@code false} otherwise.
+     */
+    public boolean removeUser(ComponentName admin, UserHandle userHandle) {
+        try {
+            return mService.removeUser(admin, userHandle);
+        } catch (RemoteException re) {
+            Log.w(TAG, "Could not remove user ", re);
+            return false;
+        }
+    }
+
     /**
      * Called by a profile or device owner to get the application restrictions for a given target
      * application running in the managed profile.

core/java/android/app/admin/IDevicePolicyManager.aidl

@@ -22,6 +22,7 @@ import android.content.Intent;
 import android.content.IntentFilter;
 import android.os.Bundle;
 import android.os.RemoteCallback;
+import android.os.UserHandle;
 
 /**
  * Internal IPC interface to the device policy service.
@@ -128,6 +129,9 @@ interface IDevicePolicyManager {
     int setApplicationsBlocked(in ComponentName admin, in Intent intent, boolean blocked);
     boolean isApplicationBlocked(in ComponentName admin, in String packageName);
 
+    UserHandle createUser(in ComponentName who, in String name);
+    boolean removeUser(in ComponentName who, in UserHandle userHandle);
+
     void enableSystemApp(in ComponentName admin, in String packageName);
     int enableSystemAppWithIntent(in ComponentName admin, in Intent intent);
 

services/devicepolicy/java/com/android/server/devicepolicy/DevicePolicyManagerService.java

@@ -3350,6 +3350,44 @@ public class DevicePolicyManagerService extends IDevicePolicyManager.Stub {
         }
     }
 
+    @Override
+    public UserHandle createUser(ComponentName who, String name) {
+        synchronized (this) {
+            if (who == null) {
+                throw new NullPointerException("ComponentName is null");
+            }
+            getActiveAdminForCallerLocked(who, DeviceAdminInfo.USES_POLICY_DEVICE_OWNER);
+
+            long id = Binder.clearCallingIdentity();
+            try {
+                UserInfo userInfo = mUserManager.createUser(name, 0 /* flags */);
+                if (userInfo != null) {
+                    return userInfo.getUserHandle();
+                }
+                return null;
+            } finally {
+                restoreCallingIdentity(id);
+            }
+        }
+    }
+
+    @Override
+    public boolean removeUser(ComponentName who, UserHandle userHandle) {
+        synchronized (this) {
+            if (who == null) {
+                throw new NullPointerException("ComponentName is null");
+            }
+            getActiveAdminForCallerLocked(who, DeviceAdminInfo.USES_POLICY_DEVICE_OWNER);
+
+            long id = Binder.clearCallingIdentity();
+            try {
+                return mUserManager.removeUser(userHandle.getIdentifier());
+            } finally {
+                restoreCallingIdentity(id);
+            }
+        }
+    }
+
     @Override
     public Bundle getApplicationRestrictions(ComponentName who, String packageName) {
         final UserHandle userHandle = new UserHandle(UserHandle.getCallingUserId());