net/http/http_auth_challenge_tokenizer.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 "net/http/http_auth_challenge_tokenizer.h"
   6
   7 #include "base/strings/string_tokenizer.h"
   8
   9 namespace net {
  10
  11 HttpAuthChallengeTokenizer::HttpAuthChallengeTokenizer(
  12     std::string::const_iterator begin,
  13     std::string::const_iterator end)
  14     : begin_(begin),
  15       end_(end),
  16       scheme_begin_(begin),
  17       scheme_end_(begin),
  18       params_begin_(end),
  19       params_end_(end) {
  20   Init(begin, end);
  21 }
  22
  23 HttpAuthChallengeTokenizer::~HttpAuthChallengeTokenizer() {
  24 }
  25
  26 HttpUtil::NameValuePairsIterator HttpAuthChallengeTokenizer::param_pairs()
  27     const {
  28   return HttpUtil::NameValuePairsIterator(params_begin_, params_end_, ',');
  29 }
  30
  31 std::string HttpAuthChallengeTokenizer::base64_param() const {
  32   // Strip off any padding.
  33   // (See https://bugzilla.mozilla.org/show_bug.cgi?id=230351.)
  34   //
  35   // Our base64 decoder requires that the length be a multiple of 4.
  36   int encoded_length = params_end_ - params_begin_;
  37   while (encoded_length > 0 && encoded_length % 4 != 0 &&
  38          params_begin_[encoded_length - 1] == '=') {
  39     --encoded_length;
  40   }
  41   return std::string(params_begin_, params_begin_ + encoded_length);
  42 }
  43
  44 void HttpAuthChallengeTokenizer::Init(std::string::const_iterator begin,
  45                                       std::string::const_iterator end) {
  46   // The first space-separated token is the auth-scheme.
  47   // NOTE: we are more permissive than RFC 2617 which says auth-scheme
  48   // is separated by 1*SP.
  49   base::StringTokenizer tok(begin, end, HTTP_LWS);
  50   if (!tok.GetNext()) {
  51     // Default param and scheme iterators provide empty strings
  52     return;
  53   }
  54
  55   // Save the scheme's position.
  56   scheme_begin_ = tok.token_begin();
  57   scheme_end_ = tok.token_end();
  58
  59   params_begin_ = scheme_end_;
  60   params_end_ = end;
  61   HttpUtil::TrimLWS(&params_begin_, &params_end_);
  62 }
  63
  64 }  // namespace net