src/chrome/browser/extensions/chrome_url_request_util.cc

   1 // Copyright 2014 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/extensions/chrome_url_request_util.h"
   6
   7 #include <string>
   8
   9 #include "base/files/file_path.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "base/path_service.h"
  12 #include "base/strings/string_number_conversions.h"
  13 #include "base/strings/string_util.h"
  14 #include "base/strings/stringprintf.h"
  15 #include "base/task_runner_util.h"
  16 #include "chrome/common/chrome_paths.h"
  17 #include "chrome/common/extensions/manifest_url_handler.h"
  18 #include "content/public/browser/browser_thread.h"
  19 #include "content/public/browser/resource_request_info.h"
  20 #include "extensions/browser/component_extension_resource_manager.h"
  21 #include "extensions/browser/extension_protocols.h"
  22 #include "extensions/browser/extensions_browser_client.h"
  23 #include "extensions/browser/info_map.h"
  24 #include "extensions/browser/url_request_util.h"
  25 #include "extensions/common/file_util.h"
  26 #include "net/base/mime_util.h"
  27 #include "net/base/net_errors.h"
  28 #include "net/http/http_request_headers.h"
  29 #include "net/http/http_response_headers.h"
  30 #include "net/http/http_response_info.h"
  31 #include "net/url_request/url_request.h"
  32 #include "net/url_request/url_request_simple_job.h"
  33 #include "ui/base/resource/resource_bundle.h"
  34
  35 using content::BrowserThread;
  36 using content::ResourceType;
  37 using extensions::ExtensionsBrowserClient;
  38
  39 namespace {
  40
  41 // A request for an extension resource in a Chrome .pak file. These are used
  42 // by component extensions.
  43 class URLRequestResourceBundleJob : public net::URLRequestSimpleJob {
  44  public:
  45   URLRequestResourceBundleJob(net::URLRequest* request,
  46                               net::NetworkDelegate* network_delegate,
  47                               const base::FilePath& filename,
  48                               int resource_id,
  49                               const std::string& content_security_policy,
  50                               bool send_cors_header)
  51       : net::URLRequestSimpleJob(request, network_delegate),
  52         filename_(filename),
  53         resource_id_(resource_id),
  54         weak_factory_(this) {
  55     // Leave cache headers out of resource bundle requests.
  56     response_info_.headers = extensions::BuildHttpHeaders(
  57         content_security_policy, send_cors_header, base::Time());
  58   }
  59
  60   // Overridden from URLRequestSimpleJob:
  61   virtual int GetData(std::string* mime_type,
  62                       std::string* charset,
  63                       std::string* data,
  64                       const net::CompletionCallback& callback) const OVERRIDE {
  65     const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
  66     *data = rb.GetRawDataResource(resource_id_).as_string();
  67
  68     // Add the Content-Length header now that we know the resource length.
  69     response_info_.headers->AddHeader(
  70         base::StringPrintf("%s: %s",
  71                            net::HttpRequestHeaders::kContentLength,
  72                            base::UintToString(data->size()).c_str()));
  73
  74     std::string* read_mime_type = new std::string;
  75     bool posted = base::PostTaskAndReplyWithResult(
  76         BrowserThread::GetBlockingPool(),
  77         FROM_HERE,
  78         base::Bind(&net::GetMimeTypeFromFile,
  79                    filename_,
  80                    base::Unretained(read_mime_type)),
  81         base::Bind(&URLRequestResourceBundleJob::OnMimeTypeRead,
  82                    weak_factory_.GetWeakPtr(),
  83                    mime_type,
  84                    charset,
  85                    data,
  86                    base::Owned(read_mime_type),
  87                    callback));
  88     DCHECK(posted);
  89
  90     return net::ERR_IO_PENDING;
  91   }
  92
  93   virtual void GetResponseInfo(net::HttpResponseInfo* info) OVERRIDE {
  94     *info = response_info_;
  95   }
  96
  97  private:
  98   virtual ~URLRequestResourceBundleJob() {}
  99
 100   void OnMimeTypeRead(std::string* out_mime_type,
 101                       std::string* charset,
 102                       std::string* data,
 103                       std::string* read_mime_type,
 104                       const net::CompletionCallback& callback,
 105                       bool read_result) {
 106     *out_mime_type = *read_mime_type;
 107     if (StartsWithASCII(*read_mime_type, "text/", false)) {
 108       // All of our HTML files should be UTF-8 and for other resource types
 109       // (like images), charset doesn't matter.
 110       DCHECK(base::IsStringUTF8(*data));
 111       *charset = "utf-8";
 112     }
 113     int result = read_result ? net::OK : net::ERR_INVALID_URL;
 114     callback.Run(result);
 115   }
 116
 117   // We need the filename of the resource to determine the mime type.
 118   base::FilePath filename_;
 119
 120   // The resource bundle id to load.
 121   int resource_id_;
 122
 123   net::HttpResponseInfo response_info_;
 124
 125   mutable base::WeakPtrFactory<URLRequestResourceBundleJob> weak_factory_;
 126 };
 127
 128 }  // namespace
 129
 130 namespace extensions {
 131 namespace chrome_url_request_util {
 132
 133 bool AllowCrossRendererResourceLoad(net::URLRequest* request,
 134                                     bool is_incognito,
 135                                     const Extension* extension,
 136                                     InfoMap* extension_info_map,
 137                                     bool* allowed) {
 138   if (url_request_util::AllowCrossRendererResourceLoad(
 139           request, is_incognito, extension, extension_info_map, allowed)) {
 140     return true;
 141   }
 142
 143   // If there aren't any explicitly marked web accessible resources, the
 144   // load should be allowed only if it is by DevTools. A close approximation is
 145   // checking if the extension contains a DevTools page.
 146   if (!ManifestURL::GetDevToolsPage(extension).is_empty()) {
 147     *allowed = true;
 148     return true;
 149   }
 150
 151   // Couldn't determine if the resource is allowed or not.
 152   return false;
 153 }
 154
 155 net::URLRequestJob* MaybeCreateURLRequestResourceBundleJob(
 156     net::URLRequest* request,
 157     net::NetworkDelegate* network_delegate,
 158     const base::FilePath& directory_path,
 159     const std::string& content_security_policy,
 160     bool send_cors_header) {
 161   base::FilePath resources_path;
 162   base::FilePath relative_path;
 163   // Try to load extension resources from chrome resource file if
 164   // directory_path is a descendant of resources_path. resources_path
 165   // corresponds to src/chrome/browser/resources in source tree.
 166   if (PathService::Get(chrome::DIR_RESOURCES, &resources_path) &&
 167       // Since component extension resources are included in
 168       // component_extension_resources.pak file in resources_path, calculate
 169       // extension relative path against resources_path.
 170       resources_path.AppendRelativePath(directory_path, &relative_path)) {
 171     base::FilePath request_path =
 172         extensions::file_util::ExtensionURLToRelativeFilePath(request->url());
 173     int resource_id = 0;
 174     if (ExtensionsBrowserClient::Get()
 175             ->GetComponentExtensionResourceManager()
 176             ->IsComponentExtensionResource(
 177                 directory_path, request_path, &resource_id)) {
 178       relative_path = relative_path.Append(request_path);
 179       relative_path = relative_path.NormalizePathSeparators();
 180       return new URLRequestResourceBundleJob(request,
 181                                              network_delegate,
 182                                              relative_path,
 183                                              resource_id,
 184                                              content_security_policy,
 185                                              send_cors_header);
 186     }
 187   }
 188   return NULL;
 189 }
 190
 191 }  // namespace chrome_url_request_util
 192 }  // namespace extensions