Add geocoding request

Author: BenjiFarquhar

lib/src/places.dart

@@ -10,6 +10,7 @@ import 'utils.dart';
 part 'places.g.dart';
 
 const _placesUrl = '/place';
+const _geocodeUrl = '/geocode/json';
 const _nearbySearchUrl = '/nearbysearch/json';
 const _textSearchUrl = '/textsearch/json';
 const _detailsSearchUrl = '/details/json';
@@ -126,6 +127,23 @@ class GoogleMapsPlaces extends GoogleWebService {
     return _decodeDetailsResponse(await doGet(url, headers: apiHeaders));
   }
 
+  /// Returns lat and lng of a place
+  Future<GeocodeResponse> cgetGeoodeByPlaceId(
+    String placeId, {
+    String? sessionToken,
+    List<String> fields = const [],
+    String? language,
+    String? region,
+  }) async {
+    final url = buildGeocodeUrl(
+      placeId: placeId,
+      sessionToken: sessionToken,
+      language: language,
+      region: region,
+    );
+    return _decodeGeocodeResponse(await doGet(url, headers: apiHeaders));
+  }
+
   @deprecated
   Future<PlacesDetailsResponse> getDetailsByReference(
     String reference, {
@@ -380,6 +398,41 @@ class GoogleMapsPlaces extends GoogleWebService {
         .toString();
   }
 
+  String buildGeocodeUrl({
+    required String placeId,
+    String? sessionToken,
+    String? language,
+    String? region,
+  }) {
+    final params = <String, String>{};
+
+      params['placeid'] = placeId;
+    
+
+    if (language != null) {
+      params['language'] = language;
+    }
+
+    if (region != null) {
+      params['region'] = region;
+    }
+
+    if (apiKey != null) {
+      params['key'] = apiKey!;
+    }
+
+    if (sessionToken != null) {
+      params['sessiontoken'] = sessionToken;
+    }
+
+    return url
+        .replace(
+          path: '${url.path}$_geocodeUrl',
+          queryParameters: params,
+        )
+        .toString();
+  }
+
   String buildAutocompleteUrl({
     required String input,
     String? sessionToken,
@@ -527,6 +580,9 @@ class GoogleMapsPlaces extends GoogleWebService {
   PlacesDetailsResponse _decodeDetailsResponse(Response res) =>
       PlacesDetailsResponse.fromJson(json.decode(res.body));
 
+  GeocodeResponse _decodeGeocodeResponse(Response res) =>
+      GeocodeResponse.fromJson(json.decode(res.body));
+
   PlacesAutocompleteResponse _decodeAutocompleteResponse(Response res) =>
       PlacesAutocompleteResponse.fromJson(json.decode(res.body));
 }
@@ -926,6 +982,29 @@ class PlacesDetailsResponse extends GoogleResponseStatus {
   Map<String, dynamic> toJson() => _$PlacesDetailsResponseToJson(this);
 }
 
+@JsonSerializable()
+class GeocodeResponse extends GoogleResponseStatus {
+  final Geometry result;
+
+  /// JSON html_attributions
+  @JsonKey(defaultValue: <String>[])
+  final List<String> htmlAttributions;
+
+  GeocodeResponse({
+    required String status,
+    String? errorMessage,
+    required this.result,
+    required this.htmlAttributions,
+  }) : super(
+          status: status,
+          errorMessage: errorMessage,
+        );
+
+  factory GeocodeResponse.fromJson(Map<String, dynamic> json) =>
+      _$GeocodeResponseFromJson(json);
+  Map<String, dynamic> toJson() => _$GeocodeResponseToJson(this);
+}
+
 @JsonSerializable()
 class Review {
   /// JSON author_name