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