dom/storage/StorageUtils.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "nsIURL.h"
   8 #include "StorageUtils.h"
   9
  10 #include "mozilla/OriginAttributes.h"
  11 #include "nsDebug.h"
  12 #include "nsIPrincipal.h"
  13 #include "nsIURI.h"
  14 #include "nsNetUtil.h"
  15 #include "nsPrintfCString.h"
  16 #include "mozilla/StorageOriginAttributes.h"
  17
  18 namespace mozilla::dom::StorageUtils {
  19
  20 bool PrincipalsEqual(nsIPrincipal* aObjectPrincipal,
  21                      nsIPrincipal* aSubjectPrincipal) {
  22   if (!aSubjectPrincipal) {
  23     return true;
  24   }
  25
  26   if (!aObjectPrincipal) {
  27     return false;
  28   }
  29
  30   return aSubjectPrincipal->Equals(aObjectPrincipal);
  31 }
  32
  33 void ReverseString(const nsACString& aSource, nsACString& aResult) {
  34   nsACString::const_iterator sourceBegin, sourceEnd;
  35   aSource.BeginReading(sourceBegin);
  36   aSource.EndReading(sourceEnd);
  37
  38   aResult.SetLength(aSource.Length());
  39   auto destEnd = aResult.EndWriting();
  40
  41   while (sourceBegin != sourceEnd) {
  42     *(--destEnd) = *sourceBegin;
  43     ++sourceBegin;
  44   }
  45 }
  46
  47 nsresult CreateReversedDomain(const nsACString& aAsciiDomain,
  48                               nsACString& aKey) {
  49   if (aAsciiDomain.IsEmpty()) {
  50     return NS_ERROR_NOT_AVAILABLE;
  51   }
  52
  53   ReverseString(aAsciiDomain, aKey);
  54
  55   aKey.Append('.');
  56   return NS_OK;
  57 }
  58
  59 // This is only a compatibility code for schema version 0.  Returns the 'scope'
  60 // key in the schema version 0 format for the scope column.
  61 nsCString Scheme0Scope(const nsACString& aOriginSuffix,
  62                        const nsACString& aOriginNoSuffix) {
  63   nsCString result;
  64
  65   StorageOriginAttributes oa;
  66   if (!aOriginSuffix.IsEmpty()) {
  67     DebugOnly<bool> success = oa.PopulateFromSuffix(aOriginSuffix);
  68     MOZ_ASSERT(success);
  69   }
  70
  71   if (oa.InIsolatedMozBrowser()) {
  72     result.AppendInt(0);  // This is the appId to be removed.
  73     result.Append(':');
  74     result.Append(oa.InIsolatedMozBrowser() ? 't' : 'f');
  75     result.Append(':');
  76   }
  77
  78   // If there is more than just appid and/or inbrowser stored in origin
  79   // attributes, put it to the schema 0 scope as well.  We must do that
  80   // to keep the scope column unique (same resolution as schema 1 has
  81   // with originAttributes and originKey columns) so that switch between
  82   // schema 1 and 0 always works in both ways.
  83   nsAutoCString remaining;
  84   oa.SetInIsolatedMozBrowser(false);
  85   oa.CreateSuffix(remaining);
  86   if (!remaining.IsEmpty()) {
  87     MOZ_ASSERT(!aOriginSuffix.IsEmpty());
  88
  89     if (result.IsEmpty()) {
  90       // Must contain the old prefix, otherwise we won't search for the whole
  91       // origin attributes suffix.
  92       result.AppendLiteral("0:f:");
  93     }
  94
  95     // Append the whole origin attributes suffix despite we have already stored
  96     // appid and inbrowser.  We are only looking for it when the scope string
  97     // starts with "$appid:$inbrowser:" (with whatever valid values).
  98     //
  99     // The OriginAttributes suffix is a string in a form like:
 100     // "^addonId=101&userContextId=5" and it's ensured it always starts with '^'
 101     // and never contains ':'.  See OriginAttributes::CreateSuffix.
 102     result.Append(aOriginSuffix);
 103     result.Append(':');
 104   }
 105
 106   result.Append(aOriginNoSuffix);
 107
 108   return result;
 109 }
 110
 111 }  // namespace mozilla::dom::StorageUtils