[Device Discovery] Move files from browser/extensions/api/dial to browser/media/router/discovery/di…

chrome/browser/extensions/api/dial/device_description_fetcher.cc

-// Copyright (c) 2017 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 "chrome/browser/extensions/api/dial/device_description_fetcher.h"
-
-#include "base/strings/string_util.h"
-#include "base/strings/stringprintf.h"
-#include "chrome/browser/extensions/api/dial/dial_device_data.h"
-#include "chrome/browser/profiles/profile.h"
-#include "content/public/browser/browser_thread.h"
-#include "net/base/load_flags.h"
-#include "net/http/http_response_headers.h"
-#include "net/http/http_status_code.h"
-#include "net/http/http_util.h"
-#include "net/url_request/url_fetcher.h"
-#include "net/url_request/url_request_context_getter.h"
-
-using content::BrowserThread;
-
-constexpr char kApplicationUrlHeaderName[] = "Application-URL";
-constexpr int kMaxRetries = 3;
-// DIAL devices are unlikely to expose uPnP functions other than DIAL, so 256kb
-// should be more than sufficient.
-constexpr int kMaxDescriptionSizeBytes = 262144;
-
-namespace extensions {
-namespace api {
-namespace dial {
-
-DeviceDescriptionFetcher::DeviceDescriptionFetcher(
-    const GURL& device_description_url,
-    net::URLRequestContextGetter* request_context,
-    base::OnceCallback<void(const DialDeviceDescriptionData&)> success_cb,
-    base::OnceCallback<void(const std::string&)> error_cb)
-    : device_description_url_(device_description_url),
-      request_context_(request_context),
-      success_cb_(std::move(success_cb)),
-      error_cb_(std::move(error_cb)) {
-  DCHECK(request_context_);
-  DCHECK(device_description_url_.is_valid());
-}
-
-DeviceDescriptionFetcher::~DeviceDescriptionFetcher() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-}
-
-void DeviceDescriptionFetcher::Start() {
-  DCHECK(thread_checker_.CalledOnValidThread());
-  DCHECK(!fetcher_);
-
-  // DIAL returns device descriptions via GET request.
-  fetcher_ =
-      net::URLFetcher::Create(kURLFetcherIDForTest, device_description_url_,
-                              net::URLFetcher::GET, this);
-
-  // net::LOAD_BYPASS_PROXY: Proxies almost certainly hurt more cases than they
-  //     help.
-  // net::LOAD_DISABLE_CACHE: The request should not touch the cache.
-  // net::LOAD_DO_NOT_{SAVE,SEND}_COOKIES: The request should not touch cookies.
-  // net::LOAD_DO_NOT_SEND_AUTH_DATA: The request should not send auth data.
-  fetcher_->SetLoadFlags(net::LOAD_BYPASS_PROXY | net::LOAD_DISABLE_CACHE |
-                         net::LOAD_DO_NOT_SAVE_COOKIES |
-                         net::LOAD_DO_NOT_SEND_COOKIES |
-                         net::LOAD_DO_NOT_SEND_AUTH_DATA);
-
-  // Section 5.4 of the DIAL spec prohibits redirects.
-  fetcher_->SetStopOnRedirect(true);
-
-  // Allow the fetcher to retry on 5XX responses and ERR_NETWORK_CHANGED.
-  fetcher_->SetMaxRetriesOn5xx(kMaxRetries);
-  fetcher_->SetAutomaticallyRetryOnNetworkChanges(kMaxRetries);
-
-  fetcher_->SetRequestContext(request_context_.get());
-  fetcher_->Start();
-}
-
-void DeviceDescriptionFetcher::OnURLFetchComplete(
-    const net::URLFetcher* source) {
-  DCHECK_EQ(fetcher_.get(), source);
-
-  if (source->GetResponseCode() != net::HTTP_OK) {
-    ReportError(
-        base::StringPrintf("HTTP %d: Unable to fetch device description",
-                           source->GetResponseCode()));
-    return;
-  }
-
-  const net::HttpResponseHeaders* headers = source->GetResponseHeaders();
-
-  // 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.
-  std::string app_url_header;
-  if (!headers->GetNormalizedHeader(kApplicationUrlHeaderName,
-                                    &app_url_header) ||
-      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 (!app_url.is_valid() || !app_url.SchemeIs("http") ||
-      !app_url.HostIsIPAddress() ||
-      app_url.host() != device_description_url_.host()) {
-    ReportError(base::StringPrintf("Invalid Application-URL: %s",
-                                   app_url_header.c_str()));
-    return;
-  }
-
-  if (source->GetReceivedResponseContentLength() > kMaxDescriptionSizeBytes) {
-    ReportError("Response too large");
-    return;
-  }
-
-  std::string device_description;
-  if (!source->GetResponseAsString(&device_description) ||
-      device_description.empty()) {
-    ReportError("Missing or empty response");
-    return;
-  }
-
-  if (!base::IsStringUTF8(device_description)) {
-    ReportError("Invalid response encoding");
-    return;
-  }
-
-  std::move(success_cb_)
-      .Run(DialDeviceDescriptionData(std::move(device_description), app_url));
-}
-
-void DeviceDescriptionFetcher::OnURLFetchDownloadProgress(
-    const net::URLFetcher* source,
-    int64_t current,
-    int64_t total,
-    int64_t current_network_bytes) {}
-
-void DeviceDescriptionFetcher::OnURLFetchUploadProgress(
-    const net::URLFetcher* source,
-    int64_t current,
-    int64_t total) {}
-
-void DeviceDescriptionFetcher::ReportError(const std::string& message) {
-  std::move(error_cb_).Run(message);
-}
-
-}  // namespace dial
-}  // namespace api
-}  // namespace extensions