components/signin/core/browser/signin_internals_util.cc

   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
  16 namespace signin_internals_util {
  17
  18 const char kSigninPrefPrefix[] = "google.services.signin.";
  19 const char kTokenPrefPrefix[] = "google.services.signin.tokens.";
  20
  21 #define ENUM_CASE(x) case x: return (std::string(kSigninPrefPrefix) + #x)
  22 std::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
  34 std::string SigninStatusFieldToString(TimedSigninStatusField field) {
  35   switch (field) {
  36     ENUM_CASE(SIGNIN_TYPE);
  37     ENUM_CASE(CLIENT_LOGIN_STATUS);
  38     ENUM_CASE(OAUTH_LOGIN_STATUS);
  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
  51 std::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.
  61 std::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