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(¶ms_begin_, ¶ms_end_); 59 } 60 61 } // namespace net 62
