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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// 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.h"
#include <algorithm>
#include "base/basictypes.h"
#include "base/string_util.h"
#include "net/http/http_auth_handler_basic.h"
#include "net/http/http_auth_handler_digest.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_util.h"
namespace net {
// static
void HttpAuth::ChooseBestChallenge(const HttpResponseHeaders* headers,
Target target,
scoped_refptr<HttpAuthHandler>* handler) {
// Choose the challenge whose authentication handler gives the maximum score.
scoped_refptr<HttpAuthHandler> best;
const std::string header_name = GetChallengeHeaderName(target);
std::string cur_challenge;
void* iter = NULL;
while (headers->EnumerateHeader(&iter, header_name, &cur_challenge)) {
scoped_refptr<HttpAuthHandler> cur;
CreateAuthHandler(cur_challenge, target, &cur);
if (cur && (!best || best->score() < cur->score()))
best.swap(cur);
}
handler->swap(best);
}
// static
void HttpAuth::CreateAuthHandler(const std::string& challenge,
Target target,
scoped_refptr<HttpAuthHandler>* handler) {
// Find the right auth handler for the challenge's scheme.
ChallengeTokenizer props(challenge.begin(), challenge.end());
scoped_refptr<HttpAuthHandler> tmp_handler;
if (LowerCaseEqualsASCII(props.scheme(), "basic")) {
tmp_handler = new HttpAuthHandlerBasic();
} else if (LowerCaseEqualsASCII(props.scheme(), "digest")) {
tmp_handler = new HttpAuthHandlerDigest();
}
if (tmp_handler) {
if (!tmp_handler->InitFromChallenge(challenge.begin(), challenge.end(),
target)) {
// Invalid/unsupported challenge.
tmp_handler = NULL;
}
}
handler->swap(tmp_handler);
}
void HttpAuth::ChallengeTokenizer::Init(std::string::const_iterator begin,
std::string::const_iterator end) {
// 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.
StringTokenizer tok(begin, end, HTTP_LWS);
if (!tok.GetNext()) {
valid_ = false;
return;
}
// Save the scheme's position.
scheme_begin_ = tok.token_begin();
scheme_end_ = tok.token_end();
// Everything past scheme_end_ is a (comma separated) value list.
if (scheme_end_ != end)
props_ = HttpUtil::ValuesIterator(scheme_end_ + 1, end, ',');
}
// We expect properties to be formatted as one of:
// name="value"
// name=value
// name=
bool HttpAuth::ChallengeTokenizer::GetNext() {
if (!props_.GetNext())
return false;
// Set the value as everything. Next we will split out the name.
value_begin_ = props_.value_begin();
value_end_ = props_.value_end();
name_begin_ = name_end_ = value_end_;
// Scan for the equals sign.
std::string::const_iterator equals = std::find(value_begin_, value_end_, '=');
if (equals == value_end_ || equals == value_begin_)
return valid_ = false; // Malformed
// Verify that the equals sign we found wasn't inside of quote marks.
for (std::string::const_iterator it = value_begin_; it != equals; ++it) {
if (HttpUtil::IsQuote(*it))
return valid_ = false; // Malformed
}
name_begin_ = value_begin_;
name_end_ = equals;
value_begin_ = equals + 1;
if (value_begin_ != value_end_ && HttpUtil::IsQuote(*value_begin_)) {
// Trim surrounding quotemarks off the value
if (*value_begin_ != *(value_end_ - 1))
return valid_ = false; // Malformed -- mismatching quotes.
value_is_quoted_ = true;
} else {
value_is_quoted_ = false;
}
return true;
}
// If value() has quotemarks, unquote it.
std::string HttpAuth::ChallengeTokenizer::unquoted_value() const {
return HttpUtil::Unquote(value_begin_, value_end_);
}
// static
std::string HttpAuth::GetChallengeHeaderName(Target target) {
switch(target) {
case AUTH_PROXY:
return "Proxy-Authenticate";
case AUTH_SERVER:
return "WWW-Authenticate";
default:
NOTREACHED();
return "";
}
}
// static
std::string HttpAuth::GetAuthorizationHeaderName(Target target) {
switch(target) {
case AUTH_PROXY:
return "Proxy-Authorization";
case AUTH_SERVER:
return "Authorization";
default:
NOTREACHED();
return "";
}
}
} // namespace net
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