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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/http_auth_challenge_tokenizer.h"
#include <string_view>
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
namespace net {
HttpAuthChallengeTokenizer::HttpAuthChallengeTokenizer(
std::string_view challenge)
: challenge_(challenge) {
Init(challenge);
}
HttpAuthChallengeTokenizer::~HttpAuthChallengeTokenizer() = default;
HttpUtil::NameValuePairsIterator HttpAuthChallengeTokenizer::param_pairs()
const {
return HttpUtil::NameValuePairsIterator(params_, /*delimiter=*/',');
}
std::string_view HttpAuthChallengeTokenizer::base64_param() const {
// Strip off any padding.
// (See https://bugzilla.mozilla.org/show_bug.cgi?id=230351.)
//
// Our base64 decoder requires that the length be a multiple of 4.
auto encoded_length = params_.length();
while (encoded_length > 0 && encoded_length % 4 != 0 &&
params_[encoded_length - 1] == '=') {
--encoded_length;
}
return params_.substr(0, encoded_length);
}
void HttpAuthChallengeTokenizer::Init(std::string_view challenge) {
// The first space-separated token is the auth-scheme.
// NOTE: we are more permissive than RFC 2617 which says auth-scheme
// is separated by 1*SP.
base::StringViewTokenizer tok(challenge, HTTP_LWS);
if (!tok.GetNext()) {
// Default param and scheme iterators provide empty strings
return;
}
// Save the scheme's position.
lower_case_scheme_ = base::ToLowerASCII(tok.token_piece());
params_ =
HttpUtil::TrimLWS(std::string_view(tok.token_end(), challenge.end()));
}
} // namespace net
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