Initial CL for talking to the WebAPK server to generate WebAPK

chrome/browser/android/webapk/webapk_builder.cc

Index: chrome/browser/android/webapk/webapk_builder.cc
diff --git a/chrome/browser/android/webapk/webapk_builder.cc b/chrome/browser/android/webapk/webapk_builder.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b62b0829e4683570ea5fcb03b9c1a54045d58644
--- /dev/null
+++ b/chrome/browser/android/webapk/webapk_builder.cc
@@ -0,0 +1,252 @@
+// 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.
+
+#include "chrome/browser/android/webapk/webapk_builder.h"
+
+#include "base/android/build_info.h"
+#include "base/android/jni_android.h"
+#include "base/android/jni_string.h"
+#include "base/bind.h"
+#include "base/command_line.h"
+#include "base/md5.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "base/strings/utf_string_conversions.h"
+#include "chrome/browser/android/webapk/webapk.pb.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/common/chrome_switches.h"
+#include "content/public/browser/browser_thread.h"
+#include "jni/WebApkBuilder_jni.h"
+#include "net/url_request/url_fetcher.h"
+#include "ui/gfx/codec/png_codec.h"
+#include "url/gurl.h"
+
+namespace {
+
+// The default WebAPK server URL.
+const char kDefaultWebApkServerUrl[] = "http://www.awesomeserver.appspot.com";
+
+// The MIME type of the POST data sent to the server.
+const char kProtoMimeType[] = "application/octet-stream";
+
+// The number of milliseconds to wait for a response from the server.
+const int kTimeoutMs = 4000;
+
+// Returns the scope from |info| if it is specified. Otherwise, returns the
+// default scope.
+GURL GetScope(const ShortcutInfo& info) {
+  return (info.scope.is_valid()) ? info.scope : info.url.GetOrigin();
+}
+
+// Computes a MD5 hash of |bitmap|'s PNG encoded bytes.
+std::string ComputeBitmapHash(const SkBitmap& bitmap) {
+  std::vector<unsigned char> png_bytes;
+  gfx::PNGCodec::EncodeBGRASkBitmap(bitmap, false, &png_bytes);
+  base::MD5Digest digest;
+  base::MD5Sum(&png_bytes.front(), png_bytes.size(), &digest);
+  return base::MD5DigestToBase16(digest);
+}
+
+}  // anonymous namespace
+
+WebApkBuilder::WebApkBuilder(content::BrowserContext* browser_context,
+                             const ShortcutInfo& shortcut_info,
+                             const SkBitmap& shortcut_icon)
+    : browser_context_(browser_context),
+      shortcut_info_(shortcut_info),
+      shortcut_icon_(shortcut_icon) {
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
+  server_url_ =
+      GURL(command_line->HasSwitch(switches::kWebApkServerUrl)
+               ? command_line->GetSwitchValueASCII(switches::kWebApkServerUrl)
+               : kDefaultWebApkServerUrl);
+}
+
+WebApkBuilder::~WebApkBuilder() {}
+
+// static
+bool WebApkBuilder::Register(JNIEnv* env) {
+  return RegisterNativesImpl(env);
+}
+
+// static
+std::string WebApkBuilder::DisplayToString(blink::WebDisplayMode display) {
+  switch (display) {
+    case blink::WebDisplayModeUndefined:
+      return "";
+    case blink::WebDisplayModeBrowser:
+      return "browser";
+    case blink::WebDisplayModeMinimalUi:
+      return "minimal-ui";
+    case blink::WebDisplayModeStandalone:
+      return "standalone";
+    case blink::WebDisplayModeFullscreen:
+      return "fullscreen";
+  }
+}
+
+// static
+std::string WebApkBuilder::OrientationToString(
+    blink::WebScreenOrientationLockType orientation) {
+  switch (orientation) {
+    case blink::WebScreenOrientationLockDefault:
+      return "";
+    case blink::WebScreenOrientationLockPortraitPrimary:
+      return "portrait-primary";
+    case blink::WebScreenOrientationLockPortraitSecondary:
+      return "portrait-secondary";
+    case blink::WebScreenOrientationLockLandscapePrimary:
+      return "landscape-primary";
+    case blink::WebScreenOrientationLockLandscapeSecondary:
+      return "landscape-secondary";
+    case blink::WebScreenOrientationLockAny:
+      return "any";
+    case blink::WebScreenOrientationLockLandscape:
+      return "landscape";
+    case blink::WebScreenOrientationLockPortrait:
+      return "portrait";
+    case blink::WebScreenOrientationLockNatural:
+      return "natural";
+  }
+}
+
+// static
+std::string WebApkBuilder::ColorToString(int64_t color) {
+  if (color == content::Manifest::kInvalidOrMissingColor)
+    return "";
+
+  SkColor sk_color = reinterpret_cast<uint32_t&>(color);
+  int r = SkColorGetR(sk_color);
+  int g = SkColorGetG(sk_color);
+  int b = SkColorGetB(sk_color);
+  double a = SkColorGetA(sk_color) / 255.0;
+  return base::StringPrintf("rgba(%d,%d,%d,%.2f)", r, g, b, a);

[scottkirkwood, 2016/07/19 17:59:14]

Glenn's parser supports rgb(), not rgba()

[pkotwicz, 2016/07/20 05:13:41]

I looked at the source code to Glenn's parser and it would be trivial to make it
support rgba().

I am pushing back because sending rgb() makes the client side update logic in
https://codereview.chromium.org/2124513002/ more complicated. Each piece of
extra complexity that we put into Chrome equals a bigger Chrome APK

[scottkirkwood, 2016/07/20 13:16:05]

Yes, would be easy for Glenn to add and would make the code more general, at
least for these reasons we should support it.

+}
+
+void WebApkBuilder::BuildAsync(const FinishCallback& finish_callback) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  finish_callback_ = finish_callback;
+  content::BrowserThread::PostTask(
+      content::BrowserThread::UI, FROM_HERE,
+      base::Bind(&WebApkBuilder::InitializeRequestContextGetterOnUIThread,
+                 base::Unretained(this)));

[Xi Han, 2016/07/14 14:53:16]

Please document here why base::Unretatined(this) would be safe. Otherwise, it is
always safe to use base::WeakPtrFactory.

[pkotwicz, 2016/07/20 05:13:41]

base::Unretained() is safe wherever it is used in this class. But that's not
obvious. If I started the timer in a different place than I do, using
base::Unretained() could be unsafe. Switching to base::WeakPtrFactory

+}
+
+void WebApkBuilder::OnURLFetchComplete(const net::URLFetcher* source) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  timer_.Stop();
+
+  if (!source->GetStatus().is_success() || source->GetResponseCode() != 200) {

[Xi Han, 2016/07/14 14:53:16]

net::HTTP_OK?

+    OnFailure();
+    return;
+  }
+
+  std::string response_string;
+  source->GetResponseAsString(&response_string);
+
+  std::unique_ptr<webapk::CreateWebApkResponse> response(
+      new webapk::CreateWebApkResponse);
+  if (!response->ParseFromString(response_string)) {
+    OnFailure();
+    return;
+  }
+
+  if (response->signed_market_url().empty()) {
+    OnFailure();
+    return;
+  }
+  OnGotMarketUrl(response->signed_market_url());
+}
+
+void WebApkBuilder::InitializeRequestContextGetterOnUIThread() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  // Must be called on UI thread.
+  request_context_getter_ =
+      Profile::FromBrowserContext(browser_context_)->GetRequestContext();
+
+  content::BrowserThread::PostTask(
+      content::BrowserThread::IO, FROM_HERE,
+      base::Bind(&WebApkBuilder::SendCreateWebApkRequest,
+                 base::Unretained(this)));

[Xi Han, 2016/07/14 14:53:16]

Same here.

+}
+
+void WebApkBuilder::SendCreateWebApkRequest() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  std::unique_ptr<webapk::CreateWebApkRequest> request =
+      BuildCreateWebApkRequest();
+
+  timer_.Start(FROM_HERE, base::TimeDelta::FromMilliseconds(kTimeoutMs),
+               base::Bind(&WebApkBuilder::OnFailure, base::Unretained(this)));
+
+  url_fetcher_ =
+      net::URLFetcher::Create(server_url_, net::URLFetcher::POST, this);
+  url_fetcher_->SetRequestContext(request_context_getter_);
+  std::string serialized_request;
+  request->SerializeToString(&serialized_request);
+  url_fetcher_->SetUploadData(kProtoMimeType, serialized_request);
+  url_fetcher_->Start();
+}
+
+void WebApkBuilder::OnGotMarketUrl(const std::string& signed_market_url) {
+  JNIEnv* env = base::android::AttachCurrentThread();
+  base::android::ScopedJavaLocalRef<jstring> java_signed_market_url =
+      base::android::ConvertUTF8ToJavaString(env, signed_market_url);
+  bool success = Java_WebApkBuilder_downloadAndInstallAsync(
+      env, java_signed_market_url.obj());
+  if (success)
+    OnSuccess();
+  else
+    OnFailure();
+}
+
+std::unique_ptr<webapk::CreateWebApkRequest>
+WebApkBuilder::BuildCreateWebApkRequest() {
+  std::unique_ptr<webapk::CreateWebApkRequest> request(
+      new webapk::CreateWebApkRequest);
+
+  webapk::WebApk* webapk = request->mutable_webapk();
+  webapk->set_manifest_url(shortcut_info_.manifest_url.spec());
+  webapk->set_requester_application_package(
+      base::android::BuildInfo::GetInstance()->package_name());
+
+  webapk::WebAppManifest* web_app_manifest = webapk->mutable_manifest();
+  web_app_manifest->set_name(base::UTF16ToUTF8(shortcut_info_.name));
+  web_app_manifest->set_short_name(
+      base::UTF16ToUTF8(shortcut_info_.short_name));
+  web_app_manifest->set_start_url(shortcut_info_.url.spec());
+  web_app_manifest->set_orientation(
+      OrientationToString(shortcut_info_.orientation));
+  web_app_manifest->set_display_mode(DisplayToString(shortcut_info_.display));
+  web_app_manifest->set_background_color(
+      ColorToString(shortcut_info_.background_color));
+  web_app_manifest->set_theme_color(ColorToString(shortcut_info_.theme_color));
+
+  std::string* scope = web_app_manifest->add_scopes();
+  scope->assign(GetScope(shortcut_info_).spec());
+  webapk::Image* image = web_app_manifest->add_icons();
+  image->set_src(shortcut_info_.icon_url.spec());
+  // TODO(pkotwicz): Get MD5 hash of untransformed icon's bytes (with no
+  // encoding/decoding).
+  image->set_hash(ComputeBitmapHash(shortcut_icon_));
+  std::vector<unsigned char> png_bytes;
+  gfx::PNGCodec::EncodeBGRASkBitmap(shortcut_icon_, false, &png_bytes);
+  image->set_image_data(&png_bytes.front(), png_bytes.size());
+
+  return request;
+}
+
+void WebApkBuilder::OnTimeout() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
+  OnFailure();
+}
+
+void WebApkBuilder::OnSuccess() {
+  finish_callback_.Run(true);
+  delete this;
+}
+
+void WebApkBuilder::OnFailure() {
+  finish_callback_.Run(false);
+  delete this;
+}