PaymentApp: Add classes for supporting Web Based Payment Apps

chrome/android/java/src/org/chromium/chrome/browser/payments/ServiceWorkerPaymentApp.java

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.payments;
+
+import android.os.Handler;
+
+import org.chromium.payments.mojom.PaymentMethodData;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
+/**
+ * This app class represents a web based payment app.

[zino, 2016/11/30 13:50:09]

nit: You probably should replace 'web based' with 'service-worker based' here
and at all other places.

[tommyt, 2016/11/30 13:54:30]

Done. I had tried, but apparently I wasn't thorough enough, on the first try :(

+ *
+ * Such apps are implemented as service workers according to the Payment
+ * App API specification.
+ *
+ * @see https://w3c.github.io/webpayments-payment-apps-api/
+ */
+public class ServiceWorkerPaymentApp implements PaymentApp {
+    private final ServiceWorkerPaymentAppBridge.Manifest mManifest;
+    private final Set<String> mMethodNames;
+
+    /**
+     * Build a web based payment app instance based on an installed manifest.
+     *
+     * @see https://w3c.github.io/webpayments-payment-apps-api/#payment-app-manifest
+     *
+     * @param manifest    A manifest that describes this payment app.
+     */
+    public ServiceWorkerPaymentApp(ServiceWorkerPaymentAppBridge.Manifest manifest) {
+        mManifest = manifest;
+
+        mMethodNames = new HashSet<>();
+        for (ServiceWorkerPaymentAppBridge.Option option : manifest.options) {
+            mMethodNames.addAll(option.enabledMethods);
+        }
+    }
+
+    @Override
+    public void getInstruments(
+            Map<String, PaymentMethodData> unusedMethodData,
+            final InstrumentsCallback callback) {
+        final List<PaymentInstrument> instruments =
+                new ArrayList<PaymentInstrument>();
+
+        for (ServiceWorkerPaymentAppBridge.Option option : mManifest.options) {
+            instruments.add(new ServiceWorkerPaymentInstrument(mManifest.id, option));
+        }
+
+        new Handler().post(new Runnable() {
+            @Override
+            public void run() {
+                callback.onInstrumentsReady(ServiceWorkerPaymentApp.this, instruments);
+            }
+        });
+    }
+
+    @Override
+    public Set<String> getAppMethodNames() {
+        return Collections.unmodifiableSet(mMethodNames);
+    }
+
+    @Override
+    public boolean supportsMethodsAndData(Map<String, PaymentMethodData> methodsAndData) {
+        // TODO(tommyt): crbug.com/669876. Implement this for Service Worker Payment Apps.
+        return true;
+    }
+
+    @Override
+    public String getAppIdentifier() {
+        return "Chrome_Service_Worker_Payment_App";
+    }
+}