chrome/browser/ui/webui/devtools_ui.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/browser/ui/webui/devtools_ui.h"
   6
   7 #include <string>
   8
   9 #include "base/memory/ref_counted_memory.h"
  10 #include "base/memory/scoped_ptr.h"
  11 #include "base/strings/string_util.h"
  12 #include "base/strings/stringprintf.h"
  13 #include "chrome/browser/net/chrome_url_request_context.h"
  14 #include "chrome/browser/profiles/profile.h"
  15 #include "chrome/common/url_constants.h"
  16 #include "content/public/browser/browser_thread.h"
  17 #include "content/public/browser/devtools_http_handler.h"
  18 #include "content/public/browser/url_data_source.h"
  19 #include "content/public/browser/web_contents.h"
  20 #include "content/public/browser/web_ui.h"
  21 #include "net/url_request/url_fetcher.h"
  22 #include "net/url_request/url_fetcher_delegate.h"
  23 #include "net/url_request/url_request_context_getter.h"
  24 #include "ui/base/resource/resource_bundle.h"
  25
  26 using content::BrowserThread;
  27 using content::WebContents;
  28
  29 namespace {
  30
  31 std::string PathWithoutParams(const std::string& path) {
  32   return GURL(std::string("chrome-devtools://devtools/") + path)
  33       .path().substr(1);
  34 }
  35
  36 const char kRemoteFrontendDomain[] = "chrome-devtools-frontend.appspot.com";
  37 const char kRemoteFrontendBase[] =
  38     "https://chrome-devtools-frontend.appspot.com/";
  39 const char kHttpNotFound[] = "HTTP/1.1 404 Not Found\n\n";
  40
  41 #if defined(DEBUG_DEVTOOLS)
  42 // Local frontend url provided by InspectUI.
  43 const char kFallbackFrontendURL[] =
  44     "chrome-devtools://devtools/bundled/devtools.html";
  45 #else
  46 // URL causing the DevTools window to display a plain text warning.
  47 const char kFallbackFrontendURL[] =
  48     "data:text/plain,Cannot load DevTools frontend from an untrusted origin";
  49 #endif  // defined(DEBUG_DEVTOOLS)
  50
  51
  52 class FetchRequest : public net::URLFetcherDelegate {
  53  public:
  54   FetchRequest(net::URLRequestContextGetter* request_context,
  55                const GURL& url,
  56                const content::URLDataSource::GotDataCallback& callback)
  57       : callback_(callback) {
  58     if (!url.is_valid()) {
  59       OnURLFetchComplete(NULL);
  60       return;
  61     }
  62
  63     fetcher_.reset(net::URLFetcher::Create(url, net::URLFetcher::GET, this));
  64     fetcher_->SetRequestContext(request_context);
  65     fetcher_->Start();
  66   }
  67
  68  private:
  69   virtual ~FetchRequest() {}
  70
  71   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE {
  72     std::string response;
  73     if (source)
  74       source->GetResponseAsString(&response);
  75     else
  76       response = kHttpNotFound;
  77
  78     callback_.Run(base::RefCountedString::TakeString(&response));
  79     delete this;
  80   }
  81
  82   scoped_ptr<net::URLFetcher> fetcher_;
  83   content::URLDataSource::GotDataCallback callback_;
  84 };
  85
  86 std::string GetMimeTypeForPath(const std::string& path) {
  87   std::string filename = PathWithoutParams(path);
  88   if (EndsWith(filename, ".html", false)) {
  89     return "text/html";
  90   } else if (EndsWith(filename, ".css", false)) {
  91     return "text/css";
  92   } else if (EndsWith(filename, ".js", false)) {
  93     return "application/javascript";
  94   } else if (EndsWith(filename, ".png", false)) {
  95     return "image/png";
  96   } else if (EndsWith(filename, ".gif", false)) {
  97     return "image/gif";
  98   } else if (EndsWith(filename, ".manifest", false)) {
  99     return "text/cache-manifest";
 100   }
 101   NOTREACHED();
 102   return "text/plain";
 103 }
 104
 105 // An URLDataSource implementation that handles chrome-devtools://devtools/
 106 // requests. Three types of requests could be handled based on the URL path:
 107 // 1. /bundled/: bundled DevTools frontend is served.
 108 // 2. /remote/: Remote DevTools frontend is served from App Engine.
 109 // 3. /localhost/: Remote frontend is served from localhost:9222. This is a
 110 // debug only feature hidden beihnd a compile time flag DEBUG_DEVTOOLS.
 111 class DevToolsDataSource : public content::URLDataSource {
 112  public:
 113   explicit DevToolsDataSource(net::URLRequestContextGetter*
 114     request_context) : request_context_(request_context) {
 115   }
 116
 117   // content::URLDataSource implementation.
 118   virtual std::string GetSource() const OVERRIDE {
 119     return chrome::kChromeUIDevToolsHost;
 120   }
 121
 122   virtual void StartDataRequest(
 123       const std::string& path,
 124       int render_process_id,
 125       int render_view_id,
 126       const content::URLDataSource::GotDataCallback& callback) OVERRIDE {
 127     std::string bundled_path_prefix(chrome::kChromeUIDevToolsBundledPath);
 128     bundled_path_prefix += "/";
 129     if (StartsWithASCII(path, bundled_path_prefix, false)) {
 130       StartBundledDataRequest(path.substr(bundled_path_prefix.length()),
 131                               render_process_id,
 132                               render_view_id,
 133                               callback);
 134       return;
 135     }
 136     std::string remote_path_prefix(chrome::kChromeUIDevToolsRemotePath);
 137     remote_path_prefix += "/";
 138     if (StartsWithASCII(path, remote_path_prefix, false)) {
 139       StartRemoteDataRequest(path.substr(remote_path_prefix.length()),
 140                               render_process_id,
 141                               render_view_id,
 142                               callback);
 143       return;
 144     }
 145   }
 146
 147   // Serves bundled DevTools frontend from ResourceBundle.
 148   void StartBundledDataRequest(
 149       const std::string& path,
 150       int render_process_id,
 151       int render_view_id,
 152       const content::URLDataSource::GotDataCallback& callback) {
 153     std::string filename = PathWithoutParams(path);
 154
 155     int resource_id =
 156         content::DevToolsHttpHandler::GetFrontendResourceId(filename);
 157
 158     DLOG_IF(WARNING, -1 == resource_id) << "Unable to find dev tool resource: "
 159         << filename << ". If you compiled with debug_devtools=1, try running"
 160         " with --debug-devtools.";
 161     const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
 162     scoped_refptr<base::RefCountedStaticMemory> bytes(rb.LoadDataResourceBytes(
 163         resource_id));
 164     callback.Run(bytes.get());
 165   }
 166
 167   // Serves remote DevTools frontend from hard-coded App Engine domain.
 168   void StartRemoteDataRequest(
 169       const std::string& path,
 170       int render_process_id,
 171       int render_view_id,
 172       const content::URLDataSource::GotDataCallback& callback) {
 173     GURL url = GURL(kRemoteFrontendBase + path);
 174     CHECK_EQ(url.host(), kRemoteFrontendDomain);
 175     new FetchRequest(request_context_.get(), url, callback);
 176   }
 177
 178   virtual std::string GetMimeType(const std::string& path) const OVERRIDE {
 179     return GetMimeTypeForPath(path);
 180   }
 181
 182   virtual bool ShouldAddContentSecurityPolicy() const OVERRIDE {
 183     return false;
 184   }
 185
 186  private:
 187   virtual ~DevToolsDataSource() {}
 188   scoped_refptr<net::URLRequestContextGetter> request_context_;
 189
 190   DISALLOW_COPY_AND_ASSIGN(DevToolsDataSource);
 191 };
 192
 193 }  // namespace
 194
 195 // static
 196 GURL DevToolsUI::GetProxyURL(const std::string& frontend_url) {
 197   GURL url(frontend_url);
 198   if (!url.is_valid() || url.host() != kRemoteFrontendDomain) {
 199     return GURL(kFallbackFrontendURL);
 200   }
 201   return GURL(base::StringPrintf("%s://%s/%s/%s",
 202               chrome::kChromeDevToolsScheme,
 203               chrome::kChromeUIDevToolsHost,
 204               chrome::kChromeUIDevToolsRemotePath,
 205               url.path().substr(1).c_str()));
 206 }
 207
 208 DevToolsUI::DevToolsUI(content::WebUI* web_ui) : WebUIController(web_ui) {
 209   web_ui->SetBindings(0);
 210   Profile* profile = Profile::FromWebUI(web_ui);
 211   content::URLDataSource::Add(
 212       profile,
 213       new DevToolsDataSource(profile->GetRequestContext()));
 214 }