Download web payment manifests.

components/payments/content/android/java/src/org/chromium/components/payments/PaymentManifestDownloader.java

+// Copyright 2017 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.components.payments;
+
+import org.chromium.base.annotations.CalledByNative;
+import org.chromium.base.annotations.JNINamespace;
+import org.chromium.content_public.browser.WebContents;
+
+import java.net.URI;
+
+/**
+ * See comment in:
+ * components/payments/content/android/payment_manifest_downloader.h
+ */
+@JNINamespace("payments")
+public class PaymentManifestDownloader {
+    /** Interface for the callback to invoke when finished downloading. */
+    public interface ManifestDownloadCallback {
+        /**
+         * Called on successful download of a payment method manifest.
+         *
+         * @param contents The successfully downloaded payment method manifest.
+         */
+        @CalledByNative("ManifestDownloadCallback")
+        void onManifestDownloadSuccess(String contents);
+
+        /** Called on failed download of a payment method manifest. */
+        @CalledByNative("ManifestDownloadCallback")
+        void onManifestDownloadFailure();
+    }
+
+    private final WebContents mWebContents;
+
+    /**
+     * Builds the downloader.
+     *
+     * @param webContents The web contents to use as the context for the download. If this goes
+     *                    away, the download is cancelled.
+     */
+    public PaymentManifestDownloader(WebContents webContents) {
+        mWebContents = webContents;
+    }
+
+    /**
+     * Downloads the manifest file asynchronously.
+     *
+     * @param methodName The payment method name that is a URI with HTTPS scheme.
+     * @param callback   The callback to invoke when finished downloading.
+     */
+    public void download(URI methodName, ManifestDownloadCallback callback) {
+        nativeDownloadPaymentManifest(mWebContents, methodName, callback);
+    }
+
+    @CalledByNative
+    private static String getUriString(URI methodName) {
+        return methodName.toString();
+    }
+
+    private static native void nativeDownloadPaymentManifest(
+            WebContents webContents, URI methodName, ManifestDownloadCallback callback);
+}