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| 1 // Copyright (c) 2017 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "base/strings/string_util.h" |
| 6 #include "base/strings/stringprintf.h" |
| 7 #include "chrome/browser/extensions/api/dial/device_description_fetcher.h" |
| 8 #include "chrome/browser/extensions/api/dial/dial_device_data.h" |
| 9 #include "chrome/browser/profiles/profile.h" |
| 10 #include "content/public/browser/browser_thread.h" |
| 11 #include "net/base/load_flags.h" |
| 12 #include "net/http/http_response_headers.h" |
| 13 #include "net/http/http_status_code.h" |
| 14 #include "net/http/http_util.h" |
| 15 #include "net/url_request/url_fetcher.h" |
| 16 |
| 17 using content::BrowserThread; |
| 18 |
| 19 constexpr char kApplicationUrlHeaderName[] = "Application-URL"; |
| 20 constexpr int kMaxRetries = 3; |
| 21 // DIAL devices are unlikely to expose uPnP functions other than DIAL, so 256kb |
| 22 // should be more than sufficient. |
| 23 constexpr int kMaxDescriptionSizeBytes = 262144; |
| 24 |
| 25 namespace extensions { |
| 26 namespace api { |
| 27 namespace dial { |
| 28 |
| 29 DeviceDescriptionFetcher::DeviceDescriptionFetcher( |
| 30 const GURL& device_description_url, |
| 31 Profile* profile, |
| 32 base::OnceCallback<void(const DialDeviceDescriptionData&)> success_cb, |
| 33 base::OnceCallback<void(const std::string&)> error_cb) |
| 34 : device_description_url_(device_description_url), |
| 35 profile_(profile), |
| 36 success_cb_(std::move(success_cb)), |
| 37 error_cb_(std::move(error_cb)) { |
| 38 DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| 39 DCHECK(profile_); |
| 40 DCHECK(device_description_url_.is_valid()); |
| 41 } |
| 42 |
| 43 DeviceDescriptionFetcher::~DeviceDescriptionFetcher() { |
| 44 DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| 45 } |
| 46 |
| 47 void DeviceDescriptionFetcher::Start() { |
| 48 DCHECK_CURRENTLY_ON(BrowserThread::UI); |
| 49 DCHECK(!fetcher_); |
| 50 |
| 51 // DIAL returns device descriptions via GET request. |
| 52 fetcher_ = |
| 53 net::URLFetcher::Create(kURLFetcherIDForTest, device_description_url_, |
| 54 net::URLFetcher::GET, this); |
| 55 |
| 56 // net::LOAD_BYPASS_PROXY: Proxies almost certainly hurt more cases than they |
| 57 // help. |
| 58 // net::LOAD_DISABLE_CACHE: The request should not touch the cache. |
| 59 // net::LOAD_DO_NOT_{SAVE,SEND}_COOKIES: The request should not touch cookies. |
| 60 // net::LOAD_DO_NOT_SEND_AUTH_DATA: The request should not send auth data. |
| 61 fetcher_->SetLoadFlags(net::LOAD_BYPASS_PROXY | net::LOAD_DISABLE_CACHE | |
| 62 net::LOAD_DO_NOT_SAVE_COOKIES | |
| 63 net::LOAD_DO_NOT_SEND_COOKIES | |
| 64 net::LOAD_DO_NOT_SEND_AUTH_DATA); |
| 65 |
| 66 // Section 5.4 of the DIAL spec prohibits redirects. |
| 67 fetcher_->SetStopOnRedirect(true); |
| 68 |
| 69 // Allow the fetcher to retry on 5XX responses and ERR_NETWORK_CHANGED. |
| 70 fetcher_->SetMaxRetriesOn5xx(kMaxRetries); |
| 71 fetcher_->SetAutomaticallyRetryOnNetworkChanges(kMaxRetries); |
| 72 |
| 73 fetcher_->SetRequestContext(profile_->GetRequestContext()); |
| 74 fetcher_->Start(); |
| 75 } |
| 76 |
| 77 void DeviceDescriptionFetcher::OnURLFetchComplete( |
| 78 const net::URLFetcher* source) { |
| 79 DCHECK_EQ(fetcher_.get(), source); |
| 80 |
| 81 if (source->GetResponseCode() != net::HTTP_OK) { |
| 82 ReportError( |
| 83 base::StringPrintf("HTTP %d: Unable to fetch device description", |
| 84 source->GetResponseCode())); |
| 85 return; |
| 86 } |
| 87 |
| 88 const net::HttpResponseHeaders* headers = source->GetResponseHeaders(); |
| 89 |
| 90 // NOTE: The uPnP spec requires devices to set a Content-Type: header of |
| 91 // text/xml; charset="utf-8" (sec 2.11). However Chromecast (and possibly |
| 92 // other devices) do not comply, so specifically not checking this header. |
| 93 std::string app_url_header; |
| 94 if (!headers->GetNormalizedHeader(kApplicationUrlHeaderName, |
| 95 &app_url_header) || |
| 96 app_url_header.empty()) { |
| 97 ReportError("Missing or empty Application-URL:"); |
| 98 return; |
| 99 } |
| 100 |
| 101 // Section 5.4 of the DIAL spec implies that the Application URL should not |
| 102 // have path, query or fragment...unsure if that can be enforced. |
| 103 GURL app_url(app_url_header); |
| 104 if (!app_url.is_valid() || !app_url.SchemeIs("http") || |
| 105 !app_url.HostIsIPAddress() || |
| 106 app_url.host() != device_description_url_.host()) { |
| 107 ReportError(base::StringPrintf("Invalid Application-URL: %s", |
| 108 app_url_header.c_str())); |
| 109 return; |
| 110 } |
| 111 |
| 112 if (source->GetReceivedResponseContentLength() > kMaxDescriptionSizeBytes) { |
| 113 ReportError("Response too large"); |
| 114 return; |
| 115 } |
| 116 |
| 117 std::string device_description; |
| 118 if (!source->GetResponseAsString(&device_description) || |
| 119 device_description.empty()) { |
| 120 ReportError("Missing or empty response"); |
| 121 return; |
| 122 } |
| 123 |
| 124 if (!base::IsStringUTF8(device_description)) { |
| 125 ReportError("Invalid response encoding"); |
| 126 return; |
| 127 } |
| 128 |
| 129 std::move(success_cb_) |
| 130 .Run(DialDeviceDescriptionData(std::move(device_description), app_url)); |
| 131 } |
| 132 |
| 133 void DeviceDescriptionFetcher::OnURLFetchDownloadProgress( |
| 134 const net::URLFetcher* source, |
| 135 int64_t current, |
| 136 int64_t total, |
| 137 int64_t current_network_bytes) {} |
| 138 |
| 139 void DeviceDescriptionFetcher::OnURLFetchUploadProgress( |
| 140 const net::URLFetcher* source, |
| 141 int64_t current, |
| 142 int64_t total) {} |
| 143 |
| 144 void DeviceDescriptionFetcher::ReportError(const std::string& message) { |
| 145 std::move(error_cb_).Run(message); |
| 146 } |
| 147 |
| 148 } // namespace dial |
| 149 } // namespace api |
| 150 } // namespace extensions |
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