[Search] Adding a URLDataSource for search feature

This implements the first-run flow for the contextual search feature. Resources are being committed in a different CL.

BUG=374932
TEST=going to chrome://contextual-search/

Review URL: https://codereview.chromium.org/375593004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@281818 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/search/contextual_search_promo_source.cc

+// Copyright 2014 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/search/contextual_search_promo_source.h"
+
+#include "base/memory/ref_counted_memory.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
+#include "chrome/common/url_constants.h"
+#include "grit/browser_resources.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "url/gurl.h"
+
+namespace {
+
+const char kPromoHTMLPath[] = "/promo.html";
+const char kPromoCSSPath[] = "/promo.css";
+const char kPromoJSPath[] = "/promo.js";
+const char kPromoOptInHTMLPath[] = "/optin.html";
+const char kPromoOptOutHTMLPath[] = "/optout.html";
+
+}  // namespace
+
+ContextualSearchPromoSource::ContextualSearchPromoSource() {}
+
+ContextualSearchPromoSource::~ContextualSearchPromoSource() {}
+
+void ContextualSearchPromoSource::StartDataRequest(
+    const std::string& path_and_query, int render_process_id,
+    int render_frame_id,
+    const content::URLDataSource::GotDataCallback& callback) {
+  GURL url(std::string(chrome::kChromeUIContextualSearchPromoURL) + "/" +
+           path_and_query);
+  std::string path(url.path());
+  if (path == kPromoHTMLPath) {
+    SendResource(IDR_CONTEXTUAL_SEARCH_PROMO_HTML, callback);
+  } else if (path == kPromoCSSPath) {
+    SendResource(IDR_CONTEXTUAL_SEARCH_PROMO_CSS, callback);
+  } else if (path == kPromoJSPath) {
+    SendResource(IDR_CONTEXTUAL_SEARCH_PROMO_JS, callback);
+  } else if (path == kPromoOptInHTMLPath) {
+    std::string empty;
+    callback.Run(base::RefCountedString::TakeString(&empty));
+  } else if (path == kPromoOptOutHTMLPath) {
+    std::string empty;
+    callback.Run(base::RefCountedString::TakeString(&empty));
+  } else {
+    callback.Run(NULL);
+  }
+}
+
+std::string ContextualSearchPromoSource::GetSource() const {
+  return chrome::kChromeUIContextualSearchPromoHost;
+}
+
+std::string ContextualSearchPromoSource::GetMimeType(
+    const std::string& path_and_query) const {
+  std::string path(GURL("chrome://host/" + path_and_query).path());
+  if (EndsWith(path, ".js", false)) return "application/javascript";
+  if (EndsWith(path, ".png", false)) return "image/png";
+  if (EndsWith(path, ".css", false)) return "text/css";
+  if (EndsWith(path, ".html", false)) return "text/html";
+  return "";
+}
+
+bool ContextualSearchPromoSource::ShouldDenyXFrameOptions() const {
+  return false;
+}
+
+void ContextualSearchPromoSource::SendResource(
+    int resource_id, const content::URLDataSource::GotDataCallback& callback) {
+  scoped_refptr<base::RefCountedStaticMemory> response(
+      ResourceBundle::GetSharedInstance().LoadDataResourceBytes(resource_id));
+  callback.Run(response.get());
+}

chrome/browser/search/contextual_search_promo_source.h

+// Copyright 2014 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.
+
+#ifndef CHROME_BROWSER_SEARCH_CONTEXTUAL_SEARCH_PROMO_SOURCE_H_
+#define CHROME_BROWSER_SEARCH_CONTEXTUAL_SEARCH_PROMO_SOURCE_H_
+
+#include "base/basictypes.h"
+#include "base/compiler_specific.h"
+#include "content/public/browser/url_data_source.h"
+
+// Serves HTML for displaying the contextual search first-run promo.
+class ContextualSearchPromoSource : public content::URLDataSource {
+ public:
+  ContextualSearchPromoSource();
+  virtual ~ContextualSearchPromoSource();
+
+ protected:
+  // Overridden from content::URLDataSource:
+  virtual void StartDataRequest(
+      const std::string& path_and_query,
+      int render_process_id,
+      int render_frame_id,
+      const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
+  virtual std::string GetSource() const OVERRIDE;
+  virtual std::string GetMimeType(
+      const std::string& path_and_query) const OVERRIDE;
+  virtual bool ShouldDenyXFrameOptions() const OVERRIDE;
+
+  // Sends unmodified resource bytes.
+  void SendResource(
+      int resource_id,
+      const content::URLDataSource::GotDataCallback& callback);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ContextualSearchPromoSource);
+};
+
+#endif  // CHROME_BROWSER_SEARCH_CONTEXTUAL_SEARCH_PROMO_SOURCE_H_

chrome/chrome_browser.gypi

@@ -1123,6 +1123,8 @@
       'browser/resources_util.h',
       'browser/safe_browsing/safe_browsing_tab_observer.cc',
       'browser/safe_browsing/safe_browsing_tab_observer.h',
+      'browser/search/contextual_search_promo_source.cc',
+      'browser/search/contextual_search_promo_source.h',
       'browser/search/hotword_client.h',
       'browser/search/hotword_service.cc',
       'browser/search/hotword_service.h',