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/*
** Copyright 2013, 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.packageinstaller;
import android.app.Activity;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.PermissionInfo;
import android.os.Bundle;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.AppSecurityPermissions;
import android.widget.Button;
import android.widget.TabHost;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.List;
/*
* The activity which is responsible for asking the user to grant permissions
* to applications.
*/
public class GrantActivity extends Activity implements OnClickListener {
private Button mOk;
private Button mCancel;
private PackageManager mPm;
private String mRequestingPackage;
private String[] requested_permissions;
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
mPm = getPackageManager();
mRequestingPackage = this.getCallingPackage();
requested_permissions = getRequestedPermissions();
if (requested_permissions.length == 0) {
// The grant request was empty. Return success
setResult(RESULT_OK);
finish();
return;
}
PackageInfo pkgInfo = getUpdatedPackageInfo();
AppSecurityPermissions perms = new AppSecurityPermissions(this, pkgInfo);
if (perms.getPermissionCount(AppSecurityPermissions.WHICH_NEW) == 0) {
// The updated permissions dialog said there are no new permissions.
// This should never occur if requested_permissions.length > 0,
// but we check for it anyway, just in case.
setResult(RESULT_OK);
finish();
return;
}
setContentView(R.layout.install_start);
((TextView)findViewById(R.id.install_confirm_question)).setText(R.string.grant_confirm_question);
PackageUtil.AppSnippet as = new PackageUtil.AppSnippet(mPm.getApplicationLabel(pkgInfo.applicationInfo),
mPm.getApplicationIcon(pkgInfo.applicationInfo));
PackageUtil.initSnippetForNewApp(this, as, R.id.app_snippet);
mOk = (Button)findViewById(R.id.ok_button);
mOk.setText(R.string.ok);
mCancel = (Button)findViewById(R.id.cancel_button);
mOk.setOnClickListener(this);
mCancel.setOnClickListener(this);
TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);
tabHost.setup();
ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
TabsAdapter adapter = new TabsAdapter(this, tabHost, viewPager);
View newTab = perms.getPermissionsView(AppSecurityPermissions.WHICH_NEW);
View allTab = getPermissionList(perms);
adapter.addTab(tabHost.newTabSpec("new").setIndicator(
getText(R.string.newPerms)), newTab);
adapter.addTab(tabHost.newTabSpec("all").setIndicator(
getText(R.string.allPerms)), allTab);
}
/**
* Returns a PackageInfo object representing the results of adding all the permissions
* in {@code requested_permissions} to {@code mRequestingPackage}. This is the package
* permissions the user will have if they accept the grant request.
*/
private PackageInfo getUpdatedPackageInfo() {
try {
PackageInfo pkgInfo = mPm.getPackageInfo(mRequestingPackage, PackageManager.GET_PERMISSIONS);
for (int i = 0; i < pkgInfo.requestedPermissions.length; i++) {
for (String requested_permission : requested_permissions) {
if (requested_permission.equals(pkgInfo.requestedPermissions[i])) {
pkgInfo.requestedPermissionsFlags[i] |= PackageInfo.REQUESTED_PERMISSION_GRANTED;
}
}
}
return pkgInfo;
} catch (NameNotFoundException e) {
throw new RuntimeException(e); // will never occur
}
}
private View getPermissionList(AppSecurityPermissions perms) {
LayoutInflater inflater = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View root = inflater.inflate(R.layout.permissions_list, null);
View personalPermissions = perms.getPermissionsView(AppSecurityPermissions.WHICH_PERSONAL);
View devicePermissions = perms.getPermissionsView(AppSecurityPermissions.WHICH_DEVICE);
((ViewGroup)root.findViewById(R.id.privacylist)).addView(personalPermissions);
((ViewGroup)root.findViewById(R.id.devicelist)).addView(devicePermissions);
return root;
}
/**
* Return an array of permissions requested by the caller, filtered to exclude
* irrelevant or otherwise malicious permission requests from untrusted callers.
*/
private String[] getRequestedPermissions() {
String[] permissions = getIntent()
.getStringArrayExtra(PackageManager.EXTRA_REQUEST_PERMISSION_PERMISSION_LIST);
if (permissions == null) {
return new String[0];
}
permissions = keepNormalDangerousPermissions(permissions);
permissions = keepRequestingPackagePermissions(permissions);
return permissions;
}
/**
* Remove any permissions in {@code permissions} which are not present
* in {@code mRequestingPackage} and return the result. We also filter out
* permissions which are required by {@code mRequestingPackage}, and permissions
* which have already been granted to {@code mRequestingPackage}, as those permissions
* are useless to change.
*/
private String[] keepRequestingPackagePermissions(String[] permissions) {
List<String> result = new ArrayList<String>();
try {
PackageInfo pkgInfo = mPm.getPackageInfo(mRequestingPackage, PackageManager.GET_PERMISSIONS);
if (pkgInfo.requestedPermissions == null) {
return new String[0];
}
for (int i = 0; i < pkgInfo.requestedPermissions.length; i++) {
for (String permission : permissions) {
final boolean isRequired =
((pkgInfo.requestedPermissionsFlags[i]
& PackageInfo.REQUESTED_PERMISSION_REQUIRED) != 0);
final boolean isGranted =
((pkgInfo.requestedPermissionsFlags[i]
& PackageInfo.REQUESTED_PERMISSION_GRANTED) != 0);
/*
* We ignore required permissions, and permissions which have already
* been granted, as it's useless to grant those permissions.
*/
if (permission.equals(pkgInfo.requestedPermissions[i])
&& !isRequired && !isGranted) {
result.add(permission);
break;
}
}
}
} catch (NameNotFoundException e) {
throw new RuntimeException(e); // should never happen
}
return result.toArray(new String[result.size()]);
}
/**
* Filter the permissions in {@code permissions}, keeping only the NORMAL or DANGEROUS
* permissions.
*
* @param permissions the permissions to filter
* @return A subset of {@code permissions} with only the
* NORMAL or DANGEROUS permissions kept
*/
private String[] keepNormalDangerousPermissions(String[] permissions) {
List<String> result = new ArrayList<String>();
for (String permission : permissions) {
try {
PermissionInfo pInfo = mPm.getPermissionInfo(permission, 0);
final int base = pInfo.protectionLevel & PermissionInfo.PROTECTION_MASK_BASE;
if ((base != PermissionInfo.PROTECTION_NORMAL)
&& (base != PermissionInfo.PROTECTION_DANGEROUS)) {
continue;
}
result.add(permission);
} catch (NameNotFoundException e) {
// ignore
}
}
return result.toArray(new String[result.size()]);
}
@Override
public void onClick(View v) {
if (v == mOk) {
for (String permission : requested_permissions) {
mPm.grantPermission(mRequestingPackage, permission);
}
setResult(RESULT_OK);
}
if (v == mCancel) {
setResult(RESULT_CANCELED);
}
finish();
}
}
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