TrampolineActivity.java
/*
* Copyright 2021 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 androidx.core.google.shortcuts;
import static androidx.annotation.RestrictTo.Scope.LIBRARY;
import static androidx.core.google.shortcuts.ShortcutUtils.SHORTCUT_TAG_KEY;
import static androidx.core.google.shortcuts.ShortcutUtils.SHORTCUT_URL_KEY;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import com.google.crypto.tink.KeysetHandle;
import com.google.crypto.tink.Mac;
import java.net.URISyntaxException;
import java.nio.charset.Charset;
import java.security.GeneralSecurityException;
/**
* Activity used to receives shortcut intents sent from Google, extracts its shortcut url, and
* launches it in the scope of the app.
*
* @hide
*/
@RestrictTo(LIBRARY)
public class TrampolineActivity extends Activity {
private static final String TAG = "TrampolineActivity";
private static volatile KeysetHandle sKeysetHandle;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (sKeysetHandle == null) {
sKeysetHandle = ShortcutUtils.getOrCreateShortcutKeysetHandle(this);
}
if (sKeysetHandle != null) {
Intent intent = getIntent();
String shortcutUrl = intent.getStringExtra(SHORTCUT_URL_KEY);
String tag = intent.getStringExtra(SHORTCUT_TAG_KEY);
if (shortcutUrl != null && tag != null) {
try {
Mac mac = sKeysetHandle.getPrimitive(Mac.class);
// Will throw GeneralSecurityException when verifyMac fails.
mac.verifyMac(Base64.decode(tag, Base64.DEFAULT),
shortcutUrl.getBytes(Charset.forName("UTF-8")));
Intent shortcutIntent = Intent.parseUri(shortcutUrl, Intent.URI_INTENT_SCHEME);
startActivity(shortcutIntent);
} catch (GeneralSecurityException | URISyntaxException e) {
Log.w(TAG, "failed to open shortcut url", e);
}
}
}
finish();
}
}