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_util::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   // Don't need "chrome-internal" which was used in old versions of Chrome for
  37   // the new tab page.
  38   url_util::AddStandardScheme(chrome::kChromeDevToolsScheme);
  39   url_util::AddStandardScheme(chrome::kChromeUIScheme);
  40   url_util::AddStandardScheme(kGuestScheme);
  41   url_util::AddStandardScheme(kMetadataScheme);
  42   std::for_each(additional_standard_schemes.begin(),
  43                 additional_standard_schemes.end(),
  44                 AddStandardSchemeHelper);
  45
  46   // Prevent future modification of the standard schemes list. This is to
  47   // prevent accidental creation of data races in the program. AddStandardScheme
  48   // isn't threadsafe so must be called when GURL isn't used on any other
  49   // thread. This is really easy to mess up, so we say that all calls to
  50   // AddStandardScheme in Chrome must be inside this function.
  51   if (lock_standard_schemes)
  52     url_util::LockStandardSchemes();
  53
  54   // We rely on the above lock to protect this part from being invoked twice.
  55   if (!additional_savable_schemes.empty()) {
  56     const char* const* default_schemes = GetSavableSchemesInternal();
  57     const char* const* default_schemes_end = NULL;
  58     for (default_schemes_end = default_schemes; *default_schemes_end;
  59          ++default_schemes_end) {}
  60     const int default_schemes_count = default_schemes_end - default_schemes;
  61
  62     int schemes = static_cast<int>(additional_savable_schemes.size());
  63     // The array, and the copied schemes won't be freed, but will remain
  64     // reachable.
  65     char **savable_schemes = new char*[schemes + default_schemes_count + 1];
  66     memcpy(savable_schemes,
  67            default_schemes,
  68            default_schemes_count * sizeof(default_schemes[0]));
  69     for (int i = 0; i < schemes; ++i) {
  70       savable_schemes[default_schemes_count + i] =
  71           base::strdup(additional_savable_schemes[i].c_str());
  72     }
  73     savable_schemes[default_schemes_count + schemes] = 0;
  74
  75     SetSavableSchemes(savable_schemes);
  76   }
  77 }
  78
  79 }  // namespace content