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// Copyright (c) 2012 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 "components/captive_portal/captive_portal_detector.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "net/base/load_flags.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_util.h"
#include "net/url_request/url_request_status.h"
namespace captive_portal {
const char CaptivePortalDetector::kDefaultURL[] =
"http://www.gstatic.com/generate_204";
CaptivePortalDetector::CaptivePortalDetector(
const scoped_refptr<net::URLRequestContextGetter>& request_context)
: request_context_(request_context) {
}
CaptivePortalDetector::~CaptivePortalDetector() {
}
void CaptivePortalDetector::DetectCaptivePortal(
const GURL& url,
const DetectionCallback& detection_callback) {
DCHECK(CalledOnValidThread());
DCHECK(!FetchingURL());
DCHECK(detection_callback_.is_null());
detection_callback_ = detection_callback;
// The first 0 means this can use a TestURLFetcherFactory in unit tests.
url_fetcher_ = net::URLFetcher::Create(0, url, net::URLFetcher::GET, this);
url_fetcher_->SetAutomaticallyRetryOn5xx(false);
url_fetcher_->SetRequestContext(request_context_.get());
// Can't safely use net::LOAD_DISABLE_CERT_REVOCATION_CHECKING here,
// since then the connection may be reused without checking the cert.
url_fetcher_->SetLoadFlags(
net::LOAD_BYPASS_CACHE |
net::LOAD_DO_NOT_SAVE_COOKIES |
net::LOAD_DO_NOT_SEND_COOKIES |
net::LOAD_DO_NOT_SEND_AUTH_DATA);
url_fetcher_->Start();
}
void CaptivePortalDetector::Cancel() {
url_fetcher_.reset();
detection_callback_.Reset();
}
void CaptivePortalDetector::OnURLFetchComplete(const net::URLFetcher* source) {
DCHECK(CalledOnValidThread());
DCHECK(FetchingURL());
DCHECK_EQ(url_fetcher_.get(), source);
DCHECK(!detection_callback_.is_null());
Results results;
GetCaptivePortalResultFromResponse(url_fetcher_.get(), &results);
DetectionCallback callback = detection_callback_;
url_fetcher_.reset();
detection_callback_.Reset();
callback.Run(results);
}
// Takes a net::URLFetcher that has finished trying to retrieve the test
// URL, and returns a CaptivePortalService::Result based on its result.
void CaptivePortalDetector::GetCaptivePortalResultFromResponse(
const net::URLFetcher* url_fetcher,
Results* results) const {
DCHECK(results);
DCHECK(!url_fetcher->GetStatus().is_io_pending());
results->result = captive_portal::RESULT_NO_RESPONSE;
results->response_code = url_fetcher->GetResponseCode();
results->retry_after_delta = base::TimeDelta();
results->landing_url = url_fetcher->GetURL();
// If there's a network error of some sort when fetching a file via HTTP,
// there may be a networking problem, rather than a captive portal.
// TODO(mmenke): Consider special handling for redirects that end up at
// errors, especially SSL certificate errors.
if (url_fetcher->GetStatus().status() != net::URLRequestStatus::SUCCESS)
return;
// In the case of 503 errors, look for the Retry-After header.
if (results->response_code == 503) {
net::HttpResponseHeaders* headers = url_fetcher->GetResponseHeaders();
std::string retry_after_string;
// If there's no Retry-After header, nothing else to do.
if (!headers->EnumerateHeader(NULL, "Retry-After", &retry_after_string))
return;
base::TimeDelta retry_after_delta;
if (net::HttpUtil::ParseRetryAfterHeader(retry_after_string,
GetCurrentTime(),
&retry_after_delta)) {
results->retry_after_delta = retry_after_delta;
}
return;
}
// A 511 response (Network Authentication Required) means that the user needs
// to login to whatever server issued the response.
// See: http://tools.ietf.org/html/rfc6585
if (results->response_code == 511) {
results->result = captive_portal::RESULT_BEHIND_CAPTIVE_PORTAL;
return;
}
// Other non-2xx/3xx HTTP responses may indicate server errors.
if (results->response_code >= 400 || results->response_code < 200)
return;
// A 204 response code indicates there's no captive portal.
if (results->response_code == 204) {
results->result = captive_portal::RESULT_INTERNET_CONNECTED;
return;
}
// Otherwise, assume it's a captive portal.
results->result = captive_portal::RESULT_BEHIND_CAPTIVE_PORTAL;
}
base::Time CaptivePortalDetector::GetCurrentTime() const {
if (time_for_testing_.is_null())
return base::Time::Now();
else
return time_for_testing_;
}
bool CaptivePortalDetector::FetchingURL() const {
return url_fetcher_.get() != NULL;
}
} // namespace captive_portal
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