sync/internal_api/syncapi_internal.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 "sync/internal_api/syncapi_internal.h"
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "sync/protocol/password_specifics.pb.h"
   9 #include "sync/protocol/sync.pb.h"
  10 #include "sync/util/cryptographer.h"
  11
  12 namespace syncer {
  13
  14 sync_pb::PasswordSpecificsData* DecryptPasswordSpecifics(
  15     const sync_pb::EntitySpecifics& specifics, Cryptographer* crypto) {
  16   if (!specifics.has_password())
  17     return NULL;
  18   const sync_pb::PasswordSpecifics& password_specifics = specifics.password();
  19   if (!password_specifics.has_encrypted())
  20     return NULL;
  21   const sync_pb::EncryptedData& encrypted = password_specifics.encrypted();
  22   scoped_ptr<sync_pb::PasswordSpecificsData> data(
  23       new sync_pb::PasswordSpecificsData);
  24   if (!crypto->Decrypt(encrypted, data.get()))
  25     return NULL;
  26   return data.release();
  27 }
  28
  29 // The list of names which are reserved for use by the server.
  30 static const char* kForbiddenServerNames[] = { "", ".", ".." };
  31
  32 // When taking a name from the syncapi, append a space if it matches the
  33 // pattern of a server-illegal name followed by zero or more spaces.
  34 void SyncAPINameToServerName(const std::string& syncer_name,
  35                              std::string* out) {
  36   *out = syncer_name;
  37   if (IsNameServerIllegalAfterTrimming(*out))
  38     out->append(" ");
  39 }
  40
  41 // Checks whether |name| is a server-illegal name followed by zero or more space
  42 // characters.  The three server-illegal names are the empty string, dot, and
  43 // dot-dot.  Very long names (>255 bytes in UTF-8 Normalization Form C) are
  44 // also illegal, but are not considered here.
  45 bool IsNameServerIllegalAfterTrimming(const std::string& name) {
  46   size_t untrimmed_count = name.find_last_not_of(' ') + 1;
  47   for (size_t i = 0; i < arraysize(kForbiddenServerNames); ++i) {
  48     if (name.compare(0, untrimmed_count, kForbiddenServerNames[i]) == 0)
  49       return true;
  50   }
  51   return false;
  52 }
  53
  54 // Compare the values of two EntitySpecifics, accounting for encryption.
  55 bool AreSpecificsEqual(const Cryptographer* cryptographer,
  56                        const sync_pb::EntitySpecifics& left,
  57                        const sync_pb::EntitySpecifics& right) {
  58   // Note that we can't compare encrypted strings directly as they are seeded
  59   // with a random value.
  60   std::string left_plaintext, right_plaintext;
  61   if (left.has_encrypted()) {
  62     if (!cryptographer->CanDecrypt(left.encrypted())) {
  63       NOTREACHED() << "Attempting to compare undecryptable data.";
  64       return false;
  65     }
  66     left_plaintext = cryptographer->DecryptToString(left.encrypted());
  67   } else {
  68     left_plaintext = left.SerializeAsString();
  69   }
  70   if (right.has_encrypted()) {
  71     if (!cryptographer->CanDecrypt(right.encrypted())) {
  72       NOTREACHED() << "Attempting to compare undecryptable data.";
  73       return false;
  74     }
  75     right_plaintext = cryptographer->DecryptToString(right.encrypted());
  76   } else {
  77     right_plaintext = right.SerializeAsString();
  78   }
  79   if (left_plaintext == right_plaintext) {
  80     return true;
  81   }
  82   return false;
  83 }
  84
  85 }  // namespace syncer