[Payments] Implement web payment app manifest

content/browser/payments/payment_app_info_fetcher.cc

Index: content/browser/payments/payment_app_info_fetcher.cc
diff --git a/content/browser/payments/payment_app_info_fetcher.cc b/content/browser/payments/payment_app_info_fetcher.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f4d68e87d696e6587138409d3daf4b4ec1f5939c
--- /dev/null
+++ b/content/browser/payments/payment_app_info_fetcher.cc
@@ -0,0 +1,157 @@
+// 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 "content/browser/payments/payment_app_info_fetcher.h"
+
+#include "base/base64.h"
+#include "base/bind_helpers.h"
+#include "content/browser/frame_host/render_frame_host_impl.h"
+#include "content/browser/service_worker/service_worker_context_wrapper.h"
+#include "content/browser/web_contents/web_contents_impl.h"
+#include "content/public/browser/browser_thread.h"
+#include "content/public/browser/manifest_icon_downloader.h"
+#include "content/public/browser/manifest_icon_selector.h"
+#include "ui/gfx/image/image.h"
+
+namespace content {
+
+namespace {
+
+// TODO(gogerald): Choose appropriate icon size dynamically on different
+// platforms.
+const int kPaymentAppIdealIconSize = 64;
+const int kPaymentAppMinimumIconSize = 0;
+
+}  // namespace
+
+PaymentAppInfoFetcher::PaymentAppInfoFetcher()
+    : context_process_id_(-1), context_frame_id_(-1) {}
+PaymentAppInfoFetcher::~PaymentAppInfoFetcher() {}
+
+void PaymentAppInfoFetcher::Start(
+    const GURL& context_url,
+    scoped_refptr<ServiceWorkerContextWrapper> service_worker_context,
+    PaymentAppInfoFetchCallback callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+
+  context_url_ = context_url;
+  callback_ = std::move(callback);
+
+  std::unique_ptr<std::vector<std::pair<int, int>>> provider_hosts =
+      service_worker_context->GetProviderHostIds(context_url.GetOrigin());
+
+  BrowserThread::PostTask(
+      BrowserThread::UI, FROM_HERE,
+      base::BindOnce(&PaymentAppInfoFetcher::StartFromUIThread, this,
+                     std::move(provider_hosts)));
+}
+
+void PaymentAppInfoFetcher::StartFromUIThread(
+    const std::unique_ptr<std::vector<std::pair<int, int>>>& provider_hosts) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  if (provider_hosts->size() == 0U) {
+    PostPaymentAppInfoFetchResultToIOThread();
+    return;
+  }
+
+  for (const auto& frame : *provider_hosts) {
+    RenderFrameHostImpl* render_frame_host =
+        RenderFrameHostImpl::FromID(frame.first, frame.second);
+    if (!render_frame_host)
+      continue;
+
+    WebContentsImpl* web_content = static_cast<WebContentsImpl*>(
+        WebContents::FromRenderFrameHost(render_frame_host));
+    if (!web_content || web_content->IsHidden() ||
+        context_url_.spec().compare(
+            web_content->GetLastCommittedURL().spec()) != 0) {
+      continue;
+    }
+
+    context_process_id_ = frame.first;
+    context_frame_id_ = frame.second;
+
+    web_content->GetManifest(base::Bind(
+        &PaymentAppInfoFetcher::FetchPaymentAppManifestCallback, this));
+    return;
+  }
+
+  PostPaymentAppInfoFetchResultToIOThread();
+}
+
+void PaymentAppInfoFetcher::FetchPaymentAppManifestCallback(
+    const GURL& url,
+    const Manifest& manifest) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  if (url.is_empty() || manifest.IsEmpty()) {
+    PostPaymentAppInfoFetchResultToIOThread();
+    return;
+  }
+
+  if (manifest.name.is_null() ||
+      !base::UTF16ToUTF8(manifest.name.string().c_str(),
+                         manifest.name.string().length(),
+                         &fetched_payment_app_name_)) {
+    PostPaymentAppInfoFetchResultToIOThread();
+    return;
+  }
+
+  GURL icon_url = ManifestIconSelector::FindBestMatchingIcon(
+      manifest.icons, kPaymentAppIdealIconSize, kPaymentAppMinimumIconSize,
+      Manifest::Icon::ANY);
+  if (!icon_url.is_valid()) {
+    PostPaymentAppInfoFetchResultToIOThread();
+    return;
+  }
+
+  RenderFrameHostImpl* render_frame_host =
+      RenderFrameHostImpl::FromID(context_process_id_, context_frame_id_);
+  if (!render_frame_host) {
+    PostPaymentAppInfoFetchResultToIOThread();
+    return;
+  }
+
+  WebContents* web_content =
+      WebContents::FromRenderFrameHost(render_frame_host);
+  if (!web_content) {
+    PostPaymentAppInfoFetchResultToIOThread();
+    return;
+  }
+
+  if (!content::ManifestIconDownloader::Download(
+          web_content, icon_url, kPaymentAppIdealIconSize,
+          kPaymentAppMinimumIconSize,
+          base::Bind(&PaymentAppInfoFetcher::OnIconFetched, this))) {
+    PostPaymentAppInfoFetchResultToIOThread();
+  }
+}
+
+void PaymentAppInfoFetcher::OnIconFetched(const SkBitmap& icon) {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  if (icon.drawsNothing()) {
+    PostPaymentAppInfoFetchResultToIOThread();
+    return;
+  }
+
+  gfx::Image decoded_image = gfx::Image::CreateFrom1xBitmap(icon);
+  scoped_refptr<base::RefCountedMemory> raw_data = decoded_image.As1xPNGBytes();
+  base::Base64Encode(
+      base::StringPiece(raw_data->front_as<char>(), raw_data->size()),
+      &fetched_payment_app_icon_);
+  PostPaymentAppInfoFetchResultToIOThread();
+}
+
+void PaymentAppInfoFetcher::PostPaymentAppInfoFetchResultToIOThread() {
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
+
+  BrowserThread::PostTask(
+      BrowserThread::IO, FROM_HERE,
+      base::BindOnce(std::move(callback_), fetched_payment_app_name_,
+                     fetched_payment_app_icon_));
+}
+
+}  // namespace content