content/common/url_schemes.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 "content/common/url_schemes.h"
   6
   7 #include <string.h>
   8
   9 #include <algorithm>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/basictypes.h"
  14 #include "base/strings/string_util.h"
  15 #include "content/common/savable_url_schemes.h"
  16 #include "content/public/common/content_client.h"
  17 #include "content/public/common/url_constants.h"
  18 #include "url/url_util.h"
  19
  20 namespace {
  21
  22 void AddStandardSchemeHelper(const std::string& scheme) {
  23   url::AddStandardScheme(scheme.c_str());
  24 }
  25
  26 }  // namespace
  27
  28 namespace content {
  29
  30 void RegisterContentSchemes(bool lock_standard_schemes) {
  31   std::vector<std::string> additional_standard_schemes;
  32   std::vector<std::string> additional_savable_schemes;
  33   GetContentClient()->AddAdditionalSchemes(&additional_standard_schemes,
  34                                            &additional_savable_schemes);
  35
  36   url::AddStandardScheme(kChromeDevToolsScheme);
  37   url::AddStandardScheme(kChromeUIScheme);
  38   url::AddStandardScheme(kGuestScheme);
  39   url::AddStandardScheme(kMetadataScheme);
  40   std::for_each(additional_standard_schemes.begin(),
  41                 additional_standard_schemes.end(),
  42                 AddStandardSchemeHelper);
  43
  44   // Prevent future modification of the standard schemes list. This is to
  45   // prevent accidental creation of data races in the program. AddStandardScheme
  46   // isn't threadsafe so must be called when GURL isn't used on any other
  47   // thread. This is really easy to mess up, so we say that all calls to
  48   // AddStandardScheme in Chrome must be inside this function.
  49   if (lock_standard_schemes)
  50     url::LockStandardSchemes();
  51
  52   // We rely on the above lock to protect this part from being invoked twice.
  53   if (!additional_savable_schemes.empty()) {
  54     const char* const* default_schemes = GetSavableSchemesInternal();
  55     const char* const* default_schemes_end = NULL;
  56     for (default_schemes_end = default_schemes; *default_schemes_end;
  57          ++default_schemes_end) {}
  58     const int default_schemes_count = default_schemes_end - default_schemes;
  59
  60     int schemes = static_cast<int>(additional_savable_schemes.size());
  61     // The array, and the copied schemes won't be freed, but will remain
  62     // reachable.
  63     char **savable_schemes = new char*[schemes + default_schemes_count + 1];
  64     memcpy(savable_schemes,
  65            default_schemes,
  66            default_schemes_count * sizeof(default_schemes[0]));
  67     for (int i = 0; i < schemes; ++i) {
  68       savable_schemes[default_schemes_count + i] =
  69           base::strdup(additional_savable_schemes[i].c_str());
  70     }
  71     savable_schemes[default_schemes_count + schemes] = 0;
  72
  73     SetSavableSchemes(savable_schemes);
  74   }
  75 }
  76
  77 }  // namespace content