| // 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 "services/device/geolocation/network_location_request.h" |
| |
| #include <stdint.h> |
| |
| #include <limits> |
| #include <set> |
| #include <string> |
| #include <utility> |
| |
| #include "base/json/json_reader.h" |
| #include "base/json/json_writer.h" |
| #include "base/memory/ptr_util.h" |
| #include "base/metrics/histogram.h" |
| #include "base/metrics/histogram_functions.h" |
| #include "base/metrics/histogram_macros.h" |
| #include "base/strings/string_number_conversions.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "base/values.h" |
| #include "net/base/escape.h" |
| #include "net/base/load_flags.h" |
| #include "net/traffic_annotation/network_traffic_annotation.h" |
| #include "services/device/geolocation/location_arbitrator.h" |
| #include "services/device/public/cpp/geolocation/geoposition.h" |
| #include "services/network/public/cpp/shared_url_loader_factory.h" |
| #include "services/network/public/cpp/simple_url_loader.h" |
| |
| namespace device { |
| namespace { |
| |
| const char kNetworkLocationBaseUrl[] = |
| "https://www.googleapis.com/geolocation/v1/geolocate"; |
| |
| const char kLocationString[] = "location"; |
| const char kLatitudeString[] = "lat"; |
| const char kLongitudeString[] = "lng"; |
| const char kAccuracyString[] = "accuracy"; |
| |
| enum NetworkLocationRequestEvent { |
| // NOTE: Do not renumber these as that would confuse interpretation of |
| // previously logged data. When making changes, also update the enum list |
| // in tools/metrics/histograms/histograms.xml to keep it in sync. |
| NETWORK_LOCATION_REQUEST_EVENT_REQUEST_START = 0, |
| NETWORK_LOCATION_REQUEST_EVENT_REQUEST_CANCEL = 1, |
| NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_SUCCESS = 2, |
| NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_NOT_OK = 3, |
| NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_EMPTY = 4, |
| NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_MALFORMED = 5, |
| NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_INVALID_FIX = 6, |
| |
| // NOTE: Add entries only immediately above this line. |
| NETWORK_LOCATION_REQUEST_EVENT_COUNT = 7 |
| }; |
| |
| void RecordUmaEvent(NetworkLocationRequestEvent event) { |
| UMA_HISTOGRAM_ENUMERATION("Geolocation.NetworkLocationRequest.Event", event, |
| NETWORK_LOCATION_REQUEST_EVENT_COUNT); |
| } |
| |
| void RecordUmaResponseCode(int code) { |
| base::UmaHistogramSparse("Geolocation.NetworkLocationRequest.ResponseCode", |
| code); |
| } |
| |
| void RecordUmaAccessPoints(int count) { |
| const int min = 1; |
| const int max = 20; |
| const int buckets = 21; |
| UMA_HISTOGRAM_CUSTOM_COUNTS("Geolocation.NetworkLocationRequest.AccessPoints", |
| count, min, max, buckets); |
| } |
| |
| // Local functions |
| |
| // Returns a URL for a request to the Google Maps geolocation API. If the |
| // specified |api_key| is not empty, it is escaped and included as a query |
| // string parameter. |
| GURL FormRequestURL(const std::string& api_key); |
| |
| void FormUploadData(const WifiData& wifi_data, |
| const base::Time& wifi_timestamp, |
| std::string* upload_data); |
| |
| // Attempts to extract a position from the response. Detects and indicates |
| // various failure cases. |
| void GetLocationFromResponse(int net_error, |
| int status_code, |
| std::unique_ptr<std::string> response_body, |
| const base::Time& wifi_timestamp, |
| const GURL& server_url, |
| mojom::Geoposition* position); |
| |
| // Parses the server response body. Returns true if parsing was successful. |
| // Sets |*position| to the parsed location if a valid fix was received, |
| // otherwise leaves it unchanged. |
| bool ParseServerResponse(const std::string& response_body, |
| const base::Time& wifi_timestamp, |
| mojom::Geoposition* position); |
| void AddWifiData(const WifiData& wifi_data, |
| int age_milliseconds, |
| base::DictionaryValue* request); |
| } // namespace |
| |
| NetworkLocationRequest::NetworkLocationRequest( |
| scoped_refptr<network::SharedURLLoaderFactory> url_loader_factory, |
| const std::string& api_key, |
| LocationResponseCallback callback) |
| : url_loader_factory_(std::move(url_loader_factory)), |
| api_key_(api_key), |
| location_response_callback_(std::move(callback)) {} |
| |
| NetworkLocationRequest::~NetworkLocationRequest() = default; |
| |
| bool NetworkLocationRequest::MakeRequest( |
| const WifiData& wifi_data, |
| const base::Time& wifi_timestamp, |
| const net::PartialNetworkTrafficAnnotationTag& partial_traffic_annotation) { |
| RecordUmaEvent(NETWORK_LOCATION_REQUEST_EVENT_REQUEST_START); |
| RecordUmaAccessPoints(wifi_data.access_point_data.size()); |
| if (url_loader_) { |
| DVLOG(1) << "NetworkLocationRequest : Cancelling pending request"; |
| RecordUmaEvent(NETWORK_LOCATION_REQUEST_EVENT_REQUEST_CANCEL); |
| url_loader_.reset(); |
| } |
| wifi_data_ = wifi_data; |
| wifi_timestamp_ = wifi_timestamp; |
| |
| net::NetworkTrafficAnnotationTag traffic_annotation = |
| net::CompleteNetworkTrafficAnnotation("network_location_request", |
| partial_traffic_annotation, |
| R"( |
| semantics { |
| description: |
| "Obtains geo position based on current IP address and local " |
| "network information including Wi-Fi access points (even if you’re " |
| "not using them)." |
| trigger: |
| "Location requests are sent when the page requests them or new " |
| "IP address is available." |
| data: "Wi-Fi data, IP address." |
| destination: GOOGLE_OWNED_SERVICE |
| } |
| policy { |
| cookies_allowed: NO |
| })"); |
| |
| auto resource_request = std::make_unique<network::ResourceRequest>(); |
| resource_request->method = "POST"; |
| resource_request->url = FormRequestURL(api_key_); |
| DCHECK(resource_request->url.is_valid()); |
| resource_request->load_flags = |
| net::LOAD_BYPASS_CACHE | net::LOAD_DISABLE_CACHE | |
| net::LOAD_DO_NOT_SAVE_COOKIES | net::LOAD_DO_NOT_SEND_COOKIES | |
| net::LOAD_DO_NOT_SEND_AUTH_DATA; |
| |
| url_loader_ = network::SimpleURLLoader::Create(std::move(resource_request), |
| traffic_annotation); |
| |
| std::string upload_data; |
| FormUploadData(wifi_data, wifi_timestamp, &upload_data); |
| url_loader_->AttachStringForUpload(upload_data, "application/json"); |
| |
| request_start_time_ = base::TimeTicks::Now(); |
| url_loader_->DownloadToString( |
| url_loader_factory_.get(), |
| base::BindOnce(&NetworkLocationRequest::OnRequestComplete, |
| base::Unretained(this)), |
| 1024 * 1024 /* 1 MiB */); |
| return true; |
| } |
| |
| void NetworkLocationRequest::OnRequestComplete( |
| std::unique_ptr<std::string> data) { |
| int net_error = url_loader_->NetError(); |
| |
| int response_code = 0; |
| if (url_loader_->ResponseInfo()) |
| response_code = url_loader_->ResponseInfo()->headers->response_code(); |
| RecordUmaResponseCode(response_code); |
| |
| mojom::Geoposition position; |
| GetLocationFromResponse(net_error, response_code, std::move(data), |
| wifi_timestamp_, url_loader_->GetFinalURL(), |
| &position); |
| |
| bool server_error = |
| net_error != net::OK || (response_code >= 500 && response_code < 600); |
| if (!server_error) { |
| const base::TimeDelta request_time = |
| base::TimeTicks::Now() - request_start_time_; |
| |
| UMA_HISTOGRAM_CUSTOM_TIMES("Net.Wifi.LbsLatency", request_time, |
| base::TimeDelta::FromMilliseconds(1), |
| base::TimeDelta::FromSeconds(10), 100); |
| } |
| |
| url_loader_.reset(); |
| |
| DVLOG(1) << "NetworkLocationRequest::OnURLFetchComplete() : run callback."; |
| location_response_callback_.Run(position, server_error, wifi_data_); |
| } |
| |
| // Local functions. |
| namespace { |
| |
| struct AccessPointLess { |
| bool operator()(const AccessPointData* ap1, |
| const AccessPointData* ap2) const { |
| return ap2->radio_signal_strength < ap1->radio_signal_strength; |
| } |
| }; |
| |
| GURL FormRequestURL(const std::string& api_key) { |
| GURL url(kNetworkLocationBaseUrl); |
| if (!api_key.empty()) { |
| std::string query(url.query()); |
| if (!query.empty()) |
| query += "&"; |
| query += "key=" + net::EscapeQueryParamValue(api_key, true); |
| GURL::Replacements replacements; |
| replacements.SetQueryStr(query); |
| return url.ReplaceComponents(replacements); |
| } |
| return url; |
| } |
| |
| void FormUploadData(const WifiData& wifi_data, |
| const base::Time& wifi_timestamp, |
| std::string* upload_data) { |
| int age = std::numeric_limits<int32_t>::min(); // Invalid so AddInteger() |
| // will ignore. |
| if (!wifi_timestamp.is_null()) { |
| // Convert absolute timestamps into a relative age. |
| int64_t delta_ms = (base::Time::Now() - wifi_timestamp).InMilliseconds(); |
| if (delta_ms >= 0 && delta_ms < std::numeric_limits<int32_t>::max()) |
| age = static_cast<int>(delta_ms); |
| } |
| |
| base::DictionaryValue request; |
| AddWifiData(wifi_data, age, &request); |
| base::JSONWriter::Write(request, upload_data); |
| } |
| |
| void AddString(const std::string& property_name, |
| const std::string& value, |
| base::DictionaryValue* dict) { |
| DCHECK(dict); |
| if (!value.empty()) |
| dict->SetString(property_name, value); |
| } |
| |
| void AddInteger(const std::string& property_name, |
| int value, |
| base::DictionaryValue* dict) { |
| DCHECK(dict); |
| if (value != std::numeric_limits<int32_t>::min()) |
| dict->SetInteger(property_name, value); |
| } |
| |
| void AddWifiData(const WifiData& wifi_data, |
| int age_milliseconds, |
| base::DictionaryValue* request) { |
| DCHECK(request); |
| |
| if (wifi_data.access_point_data.empty()) |
| return; |
| |
| typedef std::multiset<const AccessPointData*, AccessPointLess> AccessPointSet; |
| AccessPointSet access_points_by_signal_strength; |
| |
| for (const auto& ap_data : wifi_data.access_point_data) |
| access_points_by_signal_strength.insert(&ap_data); |
| |
| auto wifi_access_point_list = std::make_unique<base::ListValue>(); |
| for (auto* ap_data : access_points_by_signal_strength) { |
| auto wifi_dict = std::make_unique<base::DictionaryValue>(); |
| AddString("macAddress", base::UTF16ToUTF8(ap_data->mac_address), |
| wifi_dict.get()); |
| AddInteger("signalStrength", ap_data->radio_signal_strength, |
| wifi_dict.get()); |
| AddInteger("age", age_milliseconds, wifi_dict.get()); |
| AddInteger("channel", ap_data->channel, wifi_dict.get()); |
| AddInteger("signalToNoiseRatio", ap_data->signal_to_noise, wifi_dict.get()); |
| wifi_access_point_list->Append(std::move(wifi_dict)); |
| } |
| request->Set("wifiAccessPoints", std::move(wifi_access_point_list)); |
| } |
| |
| void FormatPositionError(const GURL& server_url, |
| const std::string& message, |
| mojom::Geoposition* position) { |
| position->error_code = mojom::Geoposition::ErrorCode::POSITION_UNAVAILABLE; |
| position->error_message = "Network location provider at '"; |
| position->error_message += server_url.GetOrigin().spec(); |
| position->error_message += "' : "; |
| position->error_message += message; |
| position->error_message += "."; |
| VLOG(1) << "NetworkLocationRequest::GetLocationFromResponse() : " |
| << position->error_message; |
| } |
| |
| void GetLocationFromResponse(int net_error, |
| int status_code, |
| std::unique_ptr<std::string> response_body, |
| const base::Time& wifi_timestamp, |
| const GURL& server_url, |
| mojom::Geoposition* position) { |
| DCHECK(position); |
| |
| // HttpPost can fail for a number of reasons. Most likely this is because |
| // we're offline, or there was no response. |
| if (net_error != net::OK) { |
| FormatPositionError(server_url, "No response received", position); |
| RecordUmaEvent(NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_EMPTY); |
| return; |
| } |
| |
| if (status_code != 200) { // HTTP OK. |
| std::string message = "Returned error code "; |
| message += base::IntToString(status_code); |
| FormatPositionError(server_url, message, position); |
| RecordUmaEvent(NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_NOT_OK); |
| return; |
| } |
| |
| // We use the timestamp from the wifi data that was used to generate |
| // this position fix. |
| DCHECK(response_body); |
| if (!ParseServerResponse(*response_body, wifi_timestamp, position)) { |
| // We failed to parse the repsonse. |
| FormatPositionError(server_url, "Response was malformed", position); |
| RecordUmaEvent(NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_MALFORMED); |
| return; |
| } |
| |
| // The response was successfully parsed, but it may not be a valid |
| // position fix. |
| if (!ValidateGeoposition(*position)) { |
| FormatPositionError(server_url, "Did not provide a good position fix", |
| position); |
| RecordUmaEvent(NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_INVALID_FIX); |
| return; |
| } |
| |
| RecordUmaEvent(NETWORK_LOCATION_REQUEST_EVENT_RESPONSE_SUCCESS); |
| } |
| |
| // Numeric values without a decimal point have type integer and IsDouble() will |
| // return false. This is convenience function for detecting integer or floating |
| // point numeric values. Note that isIntegral() includes boolean values, which |
| // is not what we want. |
| bool GetAsDouble(const base::DictionaryValue& object, |
| const std::string& property_name, |
| double* out) { |
| DCHECK(out); |
| const base::Value* value = NULL; |
| if (!object.Get(property_name, &value)) |
| return false; |
| int value_as_int; |
| DCHECK(value); |
| if (value->GetAsInteger(&value_as_int)) { |
| *out = value_as_int; |
| return true; |
| } |
| return value->GetAsDouble(out); |
| } |
| |
| bool ParseServerResponse(const std::string& response_body, |
| const base::Time& wifi_timestamp, |
| mojom::Geoposition* position) { |
| DCHECK(position); |
| DCHECK(!ValidateGeoposition(*position)); |
| DCHECK(position->error_code == mojom::Geoposition::ErrorCode::NONE); |
| DCHECK(!wifi_timestamp.is_null()); |
| |
| if (response_body.empty()) { |
| LOG(WARNING) << "ParseServerResponse() : Response was empty."; |
| return false; |
| } |
| DVLOG(1) << "ParseServerResponse() : Parsing response " << response_body; |
| |
| // Parse the response, ignoring comments. |
| std::string error_msg; |
| std::unique_ptr<base::Value> response_value = |
| base::JSONReader::ReadAndReturnError(response_body, base::JSON_PARSE_RFC, |
| NULL, &error_msg); |
| if (response_value == NULL) { |
| LOG(WARNING) << "ParseServerResponse() : JSONReader failed : " << error_msg; |
| return false; |
| } |
| |
| if (!response_value->is_dict()) { |
| VLOG(1) << "ParseServerResponse() : Unexpected response type " |
| << response_value->type(); |
| return false; |
| } |
| const base::DictionaryValue* response_object = |
| static_cast<base::DictionaryValue*>(response_value.get()); |
| |
| // Get the location |
| const base::Value* location_value = NULL; |
| if (!response_object->Get(kLocationString, &location_value)) { |
| VLOG(1) << "ParseServerResponse() : Missing location attribute."; |
| // GLS returns a response with no location property to represent |
| // no fix available; return true to indicate successful parse. |
| return true; |
| } |
| DCHECK(location_value); |
| |
| if (!location_value->is_dict()) { |
| if (!location_value->is_none()) { |
| VLOG(1) << "ParseServerResponse() : Unexpected location type " |
| << location_value->type(); |
| // If the network provider was unable to provide a position fix, it should |
| // return a HTTP 200, with "location" : null. Otherwise it's an error. |
| return false; |
| } |
| return true; // Successfully parsed response containing no fix. |
| } |
| const base::DictionaryValue* location_object = |
| static_cast<const base::DictionaryValue*>(location_value); |
| |
| // latitude and longitude fields are always required. |
| double latitude = 0; |
| double longitude = 0; |
| if (!GetAsDouble(*location_object, kLatitudeString, &latitude) || |
| !GetAsDouble(*location_object, kLongitudeString, &longitude)) { |
| VLOG(1) << "ParseServerResponse() : location lacks lat and/or long."; |
| return false; |
| } |
| // All error paths covered: now start actually modifying postion. |
| position->latitude = latitude; |
| position->longitude = longitude; |
| position->timestamp = wifi_timestamp; |
| |
| // Other fields are optional. |
| GetAsDouble(*response_object, kAccuracyString, &position->accuracy); |
| |
| return true; |
| } |
| |
| } // namespace |
| |
| } // namespace device |