Implement IntentFilter verification service.

This commit adds a verifier that verifies a host delegates permission for
an app to handle Url for the host using the Statement protocol.

- Implements the Statement protocol
-- The protocol defines a file format that represents statements.
-- The protocol defines where each asset type should put their statement
declaration. For web asset, the statement file should be hosted at
<scheme>://<host>:<port>/.well-known/associations.json.

- Implements IntentFilterVerificationReceiver, an interface between
StatementService and PackageManager. PackageManager will send a
broadcast with action Intent.ACTION_INTENT_FILTER_NEEDS_VERIFICATION.
The service will process the request and returns the results by calling
PackageManager.verifyIntentFilter().

To verify an IntentFilter like this defined in Android app com.test.app
<intent-filter>
  <data android:scheme="https" />
  <data android:host="www.test.com" />
  <data android:pathPattern=".*"/>
</intent-filter>

The service will try to retrieve the statement file from
https://www.test.com:443/.well-known/associations.json and try to find
a JSON object equivalent to
{'relation': ['delegate_permission/common.handle_all_urls'],
 'target': {'namespace': 'android_app',
            'package_name': 'com.test.app',
            'sha256_cert_fingerprints': [APP_CERT_FP]}}
The entry should have the correct relation, package name, and
certificate sha256 fingerprint.

Because this implementation will send a HTTP request for each host
specified in the intent-filter in AndroidManifest.xml, to avoid overwhelming
the network at app install time, we limit the maximum number of hosts we will
verify for a single app to 10. Any app with more than 10 hosts in the
autoVerify=true intent-filter won't be auto verified.

Change-Id: I787c9d176e4110aa441eb5fe4fa9651a071c6610

1 files changed, 46 insertions, 0 deletions

diff --git a/packages/StatementService/src/com/android/statementservice/ExceptionLoggingFutureTask.java b/packages/StatementService/src/com/android/statementservice/ExceptionLoggingFutureTask.java
new file mode 100644
index 000000000000..20c7f9715895
--- /dev/null
+++ b/packages/StatementService/src/com/android/statementservice/ExceptionLoggingFutureTask.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2015 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.statementservice;
+
+import android.util.Log;
+
+import java.util.concurrent.Callable;
+import java.util.concurrent.ExecutionException;
+import java.util.concurrent.FutureTask;
+
+/**
+ * {@link FutureTask} that logs unhandled exceptions.
+ */
+final class ExceptionLoggingFutureTask<V> extends FutureTask<V> {
+
+    private final String mTag;
+
+    public ExceptionLoggingFutureTask(Callable<V> callable, String tag) {
+        super(callable);
+        mTag = tag;
+    }
+
+    @Override
+    protected void done() {
+        try {
+            get();
+        } catch (ExecutionException | InterruptedException e) {
+            Log.e(mTag, "Uncaught exception.", e);
+            throw new RuntimeException(e);
+        }
+    }
+}