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
HttpAuthChallengeTokenizer(std::string::const_iterator begin,std::string::const_iterator end)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
param_pairs() const23 HttpUtil::NameValuePairsIterator HttpAuthChallengeTokenizer::param_pairs()
24 const {
25 return HttpUtil::NameValuePairsIterator(params_begin_, params_end_, ',');
26 }
27
base64_param() const28 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
Init(std::string::const_iterator begin,std::string::const_iterator end)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