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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/media/router/discovery/dial/device_description_fetcher.h"
#include <utility>
#include "base/functional/bind.h"
#include "base/strings/stringprintf.h"
#include "chrome/browser/media/router/discovery/dial/dial_device_data.h"
#include "net/base/ip_address.h"
#include "net/http/http_response_headers.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
constexpr char kApplicationUrlHeaderName[] = "Application-URL";
namespace media_router {
DeviceDescriptionFetcher::DeviceDescriptionFetcher(
const DialDeviceData& device_data,
base::OnceCallback<void(const DialDeviceDescriptionData&)> success_cb,
base::OnceCallback<void(const std::string&)> error_cb)
: device_data_(device_data),
success_cb_(std::move(success_cb)),
error_cb_(std::move(error_cb)) {}
DeviceDescriptionFetcher::~DeviceDescriptionFetcher() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
}
void DeviceDescriptionFetcher::Start() {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(!fetcher_);
fetcher_ = std::make_unique<DialURLFetcher>(
base::BindOnce(&DeviceDescriptionFetcher::ProcessResponse,
base::Unretained(this)),
base::BindOnce(&DeviceDescriptionFetcher::ReportError,
base::Unretained(this)));
fetcher_->Get(device_description_url(), false /** set_origin_header **/);
}
void DeviceDescriptionFetcher::ProcessResponse(const std::string& response) {
DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
DCHECK(fetcher_);
const network::mojom::URLResponseHead* response_info =
fetcher_->GetResponseHead();
DCHECK(response_info);
// NOTE: The uPnP spec requires devices to set a Content-Type: header of
// text/xml; charset="utf-8" (sec 2.11). However Chromecast (and possibly
// other devices) do not comply, so specifically not checking this header.
if (!response_info->headers) {
ReportError("Missing or empty Application-URL:");
return;
}
std::string app_url_header =
response_info->headers->GetNormalizedHeader(kApplicationUrlHeaderName)
.value_or(std::string());
if (app_url_header.empty()) {
ReportError("Missing or empty Application-URL:");
return;
}
// Section 5.4 of the DIAL spec implies that the Application URL should not
// have path, query or fragment...unsure if that can be enforced.
GURL app_url(app_url_header);
if (!device_data_.IsValidUrl(app_url)) {
ReportError(base::StringPrintf("Invalid Application-URL: %s",
app_url_header.c_str()));
return;
}
// Remove trailing slash if there is any.
if (app_url.ExtractFileName().empty()) {
app_url = GURL(app_url_header.substr(0, app_url_header.length() - 1));
}
std::move(success_cb_).Run(DialDeviceDescriptionData(response, app_url));
}
void DeviceDescriptionFetcher::ReportError(const std::string& message,
std::optional<int> response_code) {
std::move(error_cb_).Run(message);
}
} // namespace media_router
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