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/chrome_manifest_url_handlers.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   int GetRefCountedData(
  62       std::string* mime_type,
  63       std::string* charset,
  64       scoped_refptr<base::RefCountedMemory>* data,
  65       const net::CompletionCallback& callback) const override {
  66     const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
  67     *data = rb.LoadDataResourceBytes(resource_id_);
  68
  69     // Add the Content-Length header now that we know the resource length.
  70     response_info_.headers->AddHeader(
  71         base::StringPrintf("%s: %s", 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(), FROM_HERE,
  77         base::Bind(&net::GetMimeTypeFromFile, filename_,
  78                    base::Unretained(read_mime_type)),
  79         base::Bind(&URLRequestResourceBundleJob::OnMimeTypeRead,
  80                    weak_factory_.GetWeakPtr(), mime_type, charset, *data,
  81                    base::Owned(read_mime_type), callback));
  82     DCHECK(posted);
  83
  84     return net::ERR_IO_PENDING;
  85   }
  86
  87   void GetResponseInfo(net::HttpResponseInfo* info) override {
  88     *info = response_info_;
  89   }
  90
  91  private:
  92   ~URLRequestResourceBundleJob() override {}
  93
  94   void OnMimeTypeRead(std::string* out_mime_type,
  95                       std::string* charset,
  96                       scoped_refptr<base::RefCountedMemory> data,
  97                       std::string* read_mime_type,
  98                       const net::CompletionCallback& callback,
  99                       bool read_result) {
 100     *out_mime_type = *read_mime_type;
 101     if (StartsWithASCII(*read_mime_type, "text/", false)) {
 102       // All of our HTML files should be UTF-8 and for other resource types
 103       // (like images), charset doesn't matter.
 104       DCHECK(base::IsStringUTF8(base::StringPiece(
 105           reinterpret_cast<const char*>(data->front()), data->size())));
 106       *charset = "utf-8";
 107     }
 108     int result = read_result ? net::OK : net::ERR_INVALID_URL;
 109     callback.Run(result);
 110   }
 111
 112   // We need the filename of the resource to determine the mime type.
 113   base::FilePath filename_;
 114
 115   // The resource bundle id to load.
 116   int resource_id_;
 117
 118   net::HttpResponseInfo response_info_;
 119
 120   mutable base::WeakPtrFactory<URLRequestResourceBundleJob> weak_factory_;
 121 };
 122
 123 }  // namespace
 124
 125 namespace extensions {
 126 namespace chrome_url_request_util {
 127
 128 bool AllowCrossRendererResourceLoad(net::URLRequest* request,
 129                                     bool is_incognito,
 130                                     const Extension* extension,
 131                                     InfoMap* extension_info_map,
 132                                     bool* allowed) {
 133   if (url_request_util::AllowCrossRendererResourceLoad(
 134           request, is_incognito, extension, extension_info_map, allowed)) {
 135     return true;
 136   }
 137
 138   // If there aren't any explicitly marked web accessible resources, the
 139   // load should be allowed only if it is by DevTools. A close approximation is
 140   // checking if the extension contains a DevTools page.
 141   if (!chrome_manifest_urls::GetDevToolsPage(extension).is_empty()) {
 142     *allowed = true;
 143     return true;
 144   }
 145
 146   // Couldn't determine if the resource is allowed or not.
 147   return false;
 148 }
 149
 150 net::URLRequestJob* MaybeCreateURLRequestResourceBundleJob(
 151     net::URLRequest* request,
 152     net::NetworkDelegate* network_delegate,
 153     const base::FilePath& directory_path,
 154     const std::string& content_security_policy,
 155     bool send_cors_header) {
 156   base::FilePath resources_path;
 157   base::FilePath relative_path;
 158   // Try to load extension resources from chrome resource file if
 159   // directory_path is a descendant of resources_path. resources_path
 160   // corresponds to src/chrome/browser/resources in source tree.
 161   if (PathService::Get(chrome::DIR_RESOURCES, &resources_path) &&
 162       // Since component extension resources are included in
 163       // component_extension_resources.pak file in resources_path, calculate
 164       // extension relative path against resources_path.
 165       resources_path.AppendRelativePath(directory_path, &relative_path)) {
 166     base::FilePath request_path =
 167         extensions::file_util::ExtensionURLToRelativeFilePath(request->url());
 168     int resource_id = 0;
 169     if (ExtensionsBrowserClient::Get()
 170             ->GetComponentExtensionResourceManager()
 171             ->IsComponentExtensionResource(
 172                 directory_path, request_path, &resource_id)) {
 173       relative_path = relative_path.Append(request_path);
 174       relative_path = relative_path.NormalizePathSeparators();
 175       return new URLRequestResourceBundleJob(request,
 176                                              network_delegate,
 177                                              relative_path,
 178                                              resource_id,
 179                                              content_security_policy,
 180                                              send_cors_header);
 181     }
 182   }
 183   return NULL;
 184 }
 185
 186 }  // namespace chrome_url_request_util
 187 }  // namespace extensions