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
  17 namespace mozilla::dom::StorageUtils {
  18
  19 bool PrincipalsEqual(nsIPrincipal* aObjectPrincipal,
  20                      nsIPrincipal* aSubjectPrincipal) {
  21   if (!aSubjectPrincipal) {
  22     return true;
  23   }
  24
  25   if (!aObjectPrincipal) {
  26     return false;
  27   }
  28
  29   return aSubjectPrincipal->Equals(aObjectPrincipal);
  30 }
  31
  32 void ReverseString(const nsACString& aSource, nsACString& aResult) {
  33   nsACString::const_iterator sourceBegin, sourceEnd;
  34   aSource.BeginReading(sourceBegin);
  35   aSource.EndReading(sourceEnd);
  36
  37   aResult.SetLength(aSource.Length());
  38   auto destEnd = aResult.EndWriting();
  39
  40   while (sourceBegin != sourceEnd) {
  41     *(--destEnd) = *sourceBegin;
  42     ++sourceBegin;
  43   }
  44 }
  45
  46 nsresult CreateReversedDomain(const nsACString& aAsciiDomain,
  47                               nsACString& aKey) {
  48   if (aAsciiDomain.IsEmpty()) {
  49     return NS_ERROR_NOT_AVAILABLE;
  50   }
  51
  52   ReverseString(aAsciiDomain, aKey);
  53
  54   aKey.Append('.');
  55   return NS_OK;
  56 }
  57
  58 // This is only a compatibility code for schema version 0.  Returns the 'scope'
  59 // key in the schema version 0 format for the scope column.
  60 nsCString Scheme0Scope(const nsACString& aOriginSuffix,
  61                        const nsACString& aOriginNoSuffix) {
  62   nsCString result;
  63
  64   OriginAttributes oa;
  65   if (!aOriginSuffix.IsEmpty()) {
  66     DebugOnly<bool> success = oa.PopulateFromSuffix(aOriginSuffix);
  67     MOZ_ASSERT(success);
  68   }
  69
  70   if (oa.mInIsolatedMozBrowser) {
  71     result.AppendInt(0);  // This is the appId to be removed.
  72     result.Append(':');
  73     result.Append(oa.mInIsolatedMozBrowser ? 't' : 'f');
  74     result.Append(':');
  75   }
  76
  77   // If there is more than just appid and/or inbrowser stored in origin
  78   // attributes, put it to the schema 0 scope as well.  We must do that
  79   // to keep the scope column unique (same resolution as schema 1 has
  80   // with originAttributes and originKey columns) so that switch between
  81   // schema 1 and 0 always works in both ways.
  82   nsAutoCString remaining;
  83   oa.mInIsolatedMozBrowser = false;
  84   oa.CreateSuffix(remaining);
  85   if (!remaining.IsEmpty()) {
  86     MOZ_ASSERT(!aOriginSuffix.IsEmpty());
  87
  88     if (result.IsEmpty()) {
  89       // Must contain the old prefix, otherwise we won't search for the whole
  90       // origin attributes suffix.
  91       result.AppendLiteral("0:f:");
  92     }
  93
  94     // Append the whole origin attributes suffix despite we have already stored
  95     // appid and inbrowser.  We are only looking for it when the scope string
  96     // starts with "$appid:$inbrowser:" (with whatever valid values).
  97     //
  98     // The OriginAttributes suffix is a string in a form like:
  99     // "^addonId=101&userContextId=5" and it's ensured it always starts with '^'
 100     // and never contains ':'.  See OriginAttributes::CreateSuffix.
 101     result.Append(aOriginSuffix);
 102     result.Append(':');
 103   }
 104
 105   result.Append(aOriginNoSuffix);
 106
 107   return result;
 108 }
 109
 110 }  // namespace mozilla::dom::StorageUtils