Download web payment manifests.

components/payments/content/android/payment_manifest_downloader_android.cc

+// 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.
+
+#include "components/payments/content/android/payment_manifest_downloader_android.h"
+
+#include <memory>
+#include <utility>
+
+#include "base/android/jni_string.h"
+#include "base/android/scoped_java_ref.h"
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "components/payments/content/android/payment_manifest_downloader.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/storage_partition.h"
+#include "content/public/browser/web_contents.h"
+#include "jni/PaymentManifestDownloader_jni.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "url/gurl.h"
+#include "url/url_constants.h"
+
+namespace payments {
+namespace {
+
+class SelfDeletingDownloadDelegate
+    : public PaymentManifestDownloader::Delegate {
+ public:
+  explicit SelfDeletingDownloadDelegate(
+      const base::android::JavaParamRef<jobject>& jcallback)
+      : jcallback_(jcallback) {}
+
+  void set_downloader(std::unique_ptr<PaymentManifestDownloader> downloader) {
+    downloader_ = std::move(downloader);
+  }
+
+  void Download() { downloader_->Download(); }
+
+  // PaymentManifestDownloader::Delegate
+  void OnManifestDownloadSuccess(const std::string& content) override {
+    JNIEnv* env = base::android::AttachCurrentThread();
+    Java_ManifestDownloadCallback_onManifestDownloadSuccess(
+        env, jcallback_, base::android::ConvertUTF8ToJavaString(env, content));
+    delete this;
+  }
+
+  // PaymentManifestDownloader::Delegate
+  void OnManifestDownloadFailure() override {
+    Java_ManifestDownloadCallback_onManifestDownloadFailure(
+        base::android::AttachCurrentThread(), jcallback_);
+    delete this;
+  }
+
+ private:
+  ~SelfDeletingDownloadDelegate() override {}
+
+  base::android::ScopedJavaGlobalRef<jobject> jcallback_;
+  std::unique_ptr<PaymentManifestDownloader> downloader_;
+
+  DISALLOW_COPY_AND_ASSIGN(SelfDeletingDownloadDelegate);
+};
+
+}  // namespace
+
+void DownloadPaymentManifest(
+    JNIEnv* env,
+    const base::android::JavaParamRef<jclass>& jcaller,
+    const base::android::JavaParamRef<jobject>& jweb_contents,
+    const base::android::JavaParamRef<jobject>& jmethod_name,

[xunjieli, 2017/03/03 16:00:22]

nit: could pass a jstring directly here instead of the jobject to avoid the JNI
round trip.

[please use gerrit instead, 2017/03/03 16:02:44]

Acknowledged. Let's see what Chris thinks about it.

+    const base::android::JavaParamRef<jobject>& jcallback) {
+  SelfDeletingDownloadDelegate* delegate =
+      new SelfDeletingDownloadDelegate(jcallback);
+
+  content::WebContents* web_contents =
+      content::WebContents::FromJavaWebContents(jweb_contents);
+  if (!web_contents) {
+    delegate->OnManifestDownloadFailure();
+    return;
+  }
+
+  GURL method_name(base::android::ConvertJavaStringToUTF8(
+      env, Java_PaymentManifestDownloader_getUriString(env, jmethod_name)));
+  DCHECK(method_name.is_valid());
+  DCHECK(method_name.SchemeIs(url::kHttpsScheme));
+
+  std::unique_ptr<PaymentManifestDownloader> downloader =
+      base::MakeUnique<PaymentManifestDownloader>(
+          content::BrowserContext::GetDefaultStoragePartition(
+              web_contents->GetBrowserContext())
+              ->GetURLRequestContext(),
+          method_name, delegate);
+  delegate->set_downloader(std::move(downloader));
+  delegate->Download();
+}
+
+bool RegisterPaymentManifestDownloader(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+}  // namespace payments