signin_internals_util.cc revision 010d83a9304c5a91596085d917d248abff47903a 
1// Copyright 2014 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 "components/signin/core/browser/signin_internals_util.h"
6
7#include <sstream>
8
9#include "base/logging.h"
10#include "base/strings/string_number_conversions.h"
11#include "base/strings/string_util.h"
12#include "base/strings/utf_string_conversions.h"
13#include "crypto/sha2.h"
14#include "google_apis/gaia/gaia_constants.h"
15
16namespace signin_internals_util {
17
18const char kSigninPrefPrefix[] = "google.services.signin.";
19const char kTokenPrefPrefix[] = "google.services.signin.tokens.";
20
21#define ENUM_CASE(x) case x: return (std::string(kSigninPrefPrefix) + #x)
22std::string SigninStatusFieldToString(UntimedSigninStatusField field) {
23  switch (field) {
24    ENUM_CASE(USERNAME);
25    case UNTIMED_FIELDS_END:
26      NOTREACHED();
27      return std::string();
28  }
29
30  NOTREACHED();
31  return std::string();
32}
33
34std::string SigninStatusFieldToString(TimedSigninStatusField field) {
35  switch (field) {
36    ENUM_CASE(SIGNIN_TYPE);
37    ENUM_CASE(AUTHENTICATION_RESULT_RECEIVED);
38    ENUM_CASE(REFRESH_TOKEN_RECEIVED);
39    ENUM_CASE(GET_USER_INFO_STATUS);
40    ENUM_CASE(UBER_TOKEN_STATUS);
41    ENUM_CASE(MERGE_SESSION_STATUS);
42    case TIMED_FIELDS_END:
43      NOTREACHED();
44      return std::string();
45  }
46
47  NOTREACHED();
48  return std::string();
49}
50
51std::string TokenPrefPath(const std::string& token_name) {
52  return std::string(kTokenPrefPrefix) + token_name;
53}
54
55// Gets the first few hex characters of the SHA256 hash of the passed in string.
56// These are enough to perform equality checks across a single users tokens,
57// while preventing outsiders from reverse-engineering the actual token from
58// the displayed value.
59// Note that for readability (in about:signin-internals), an empty string
60// is not hashed, but simply returned as an empty string.
61std::string GetTruncatedHash(const std::string& str) {
62  if (str.empty())
63    return str;
64
65  // Since each character in the hash string generates two hex charaters
66  // we only need half as many charaters in |hash_val| as hex characters
67  // returned.
68  const int kTruncateSize = kTruncateTokenStringLength / 2;
69  char hash_val[kTruncateSize];
70  crypto::SHA256HashString(str, &hash_val[0], kTruncateSize);
71  return StringToLowerASCII(base::HexEncode(&hash_val[0], kTruncateSize));
72}
73
74} //  namespace signin_internals_util
75