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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,177 @@ | ||
| library mapbox_geocoding; | ||
|
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| import 'dart:convert'; | ||
| import 'dart:developer' show log; | ||
| import 'dart:io'; | ||
|
|
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| import 'package:green_walking/config.dart'; | ||
| import 'package:http/http.dart' as http; | ||
| import 'package:mapbox_maps_flutter/mapbox_maps_flutter.dart' show Position; | ||
|
|
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| class GeocodingPlace { | ||
| GeocodingPlace({this.text, this.placeName, this.center, this.url}); | ||
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| factory GeocodingPlace.fromMapboxJson(Map<String, dynamic> raw) { | ||
| final List<dynamic>? rawCenter = raw['center'] as List<dynamic>?; | ||
| Position? center; | ||
| if (rawCenter != null && rawCenter.length == 2) { | ||
| final dynamic rawLat = rawCenter[1]; | ||
| final dynamic rawLng = rawCenter[0]; | ||
| center = Position(rawLng is int ? rawLng.toDouble() : rawLng as double, | ||
| rawLat is int ? rawLat.toDouble() : rawLat as double); | ||
| } | ||
| return GeocodingPlace( | ||
| text: raw['text'] as String?, | ||
| placeName: raw['place_name'] as String?, | ||
| center: center, | ||
| ); | ||
| } | ||
|
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| factory GeocodingPlace.fromOsmJson(Map<String, dynamic> raw) { | ||
| Position? center; | ||
| try { | ||
| center = Position(double.parse(raw['lon']), double.parse(raw['lat'])); | ||
| } catch (e) { | ||
| log('failed to parse position: $e'); | ||
| } | ||
|
|
||
| final int placeId = raw['place_id'] as int; | ||
| final String? type = raw['type'] as String?; | ||
| final String? name = raw['name'] as String?; | ||
| final Uri url = Uri.https('nominatim.openstreetmap.org', '/ui/details.html', | ||
| <String, String>{'place_id': placeId.toString()}); | ||
|
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| return GeocodingPlace( | ||
| text: name != null && name.isNotEmpty ? name : type, | ||
| placeName: raw['display_name'] as String?, | ||
| center: center, | ||
| url: url, | ||
| ); | ||
| } | ||
|
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| final String? text; | ||
| final String? placeName; | ||
| final Position? center; | ||
| final Uri? url; | ||
| } | ||
|
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| class GeocodingResult { | ||
| GeocodingResult(this.features, {this.attribution}); | ||
|
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| factory GeocodingResult.fromMapboxJson(Map<String, dynamic> raw) { | ||
| final List<dynamic> features = | ||
| raw['features'] as List<dynamic>? ?? <dynamic>[]; | ||
| return GeocodingResult( | ||
| features | ||
| .map((dynamic e) => e as Map<String, dynamic>) | ||
| .map((Map<String, dynamic> e) => GeocodingPlace.fromMapboxJson(e)) | ||
| .where((element) => | ||
| element.text != null && | ||
| element.placeName != null && | ||
| element.center != null) | ||
| .toList(), | ||
| attribution: raw['attribution'] as String?); | ||
| } | ||
|
|
||
| factory GeocodingResult.fromOsmJson(Map<String, dynamic> raw) { | ||
| final List<GeocodingPlace> features = [GeocodingPlace.fromOsmJson(raw)]; | ||
|
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| return GeocodingResult( | ||
| features | ||
| .where((element) => | ||
| element.text != null && | ||
| element.placeName != null && | ||
| element.center != null) | ||
| .toList(), | ||
| attribution: raw['licence'] as String?); | ||
| } | ||
|
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||
| final List<GeocodingPlace> features; | ||
| final String? attribution; | ||
| } | ||
|
|
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| class GeocodingServiceException implements Exception { | ||
| GeocodingServiceException(this.cause); | ||
| String cause; | ||
| } | ||
|
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| Future<GeocodingResult> _mapboxGeocoding( | ||
| String query, String token, Map<String, String> params) async { | ||
| final Uri url = Uri.https( | ||
| 'api.mapbox.com', '/geocoding/v5/mapbox.places/$query.json', params); | ||
| try { | ||
| final http.Response response = await http.get(url); | ||
| if (response.statusCode == 200) { | ||
| return GeocodingResult.fromMapboxJson( | ||
| json.decode(response.body) as Map<String, dynamic>); | ||
| } else { | ||
| throw GeocodingServiceException( | ||
| 'Invalid ${response.statusCode} response from API'); | ||
| } | ||
| } on SocketException catch (e) { | ||
| log('mapbox geocoding socket failed: $e'); | ||
| throw GeocodingServiceException('No internet connection'); | ||
| } catch (e) { | ||
| log('mapbox geocoding failed: $e'); | ||
| throw GeocodingServiceException('Internal error'); | ||
| } | ||
| } | ||
|
|
||
| // Note For debugging https://docs.mapbox.com/playground/geocoding/ is helpful | ||
| Future<GeocodingResult> mapboxForwardGeocoding(String query, String token, | ||
| {Position? proximity, int limit = 5}) async { | ||
| final Map<String, String> params = <String, String>{ | ||
| 'access_token': token, | ||
| 'limit': limit.toString(), | ||
| }; | ||
| if (proximity != null) { | ||
| params['proximity'] = _mapboxPositionToString(proximity); | ||
| } | ||
| return _mapboxGeocoding(query, token, params); | ||
| } | ||
|
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||
| // Note For debugging https://docs.mapbox.com/playground/geocoding/ is helpful | ||
| // Consider improving it: https://nominatim.openstreetmap.org/ui/reverse.html | ||
| Future<GeocodingResult> mapboxReverseGeocoding(Position query, String token, | ||
| {int limit = 1}) async { | ||
| final Map<String, String> params = <String, String>{ | ||
| 'access_token': token, | ||
| // Not included: country,region,postcode,district,locality,neighborhood,place,poi | ||
| 'types': 'address', | ||
| // If multiple types are set the limit must not be set. | ||
| 'limit': limit.toString(), | ||
| }; | ||
| return _mapboxGeocoding(_mapboxPositionToString(query), token, params); | ||
| } | ||
|
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| String _mapboxPositionToString(Position position, {int fractionDigits = 6}) { | ||
| return '${position.lng.toStringAsFixed(fractionDigits)},${position.lat.toStringAsFixed(fractionDigits)}'; | ||
| } | ||
|
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| Future<GeocodingResult> osmReverseGeocoding(Position position, | ||
| {int zoom = 18}) async { | ||
| final Uri url = | ||
| Uri.https('nominatim.openstreetmap.org', 'reverse.php', <String, String>{ | ||
| 'lat': position.lat.toStringAsFixed(6), | ||
| 'lon': position.lng.toStringAsFixed(6), | ||
| 'zoom': zoom.toString(), | ||
| 'format': 'jsonv2' | ||
| }); | ||
| try { | ||
| final http.Response response = await http.get(url, | ||
| headers: <String, String>{'User-Agent': 'Android app $androidAppID'}); | ||
| if (response.statusCode == 200) { | ||
| return GeocodingResult.fromOsmJson( | ||
| json.decode(response.body) as Map<String, dynamic>); | ||
| } else { | ||
| throw GeocodingServiceException( | ||
| 'Invalid ${response.statusCode} response from API'); | ||
| } | ||
| } on SocketException catch (e) { | ||
| log('osm geocoding socket failed: $e'); | ||
| throw GeocodingServiceException('No internet connection'); | ||
| } catch (e) { | ||
| log('osm geocoding failed: $e'); | ||
| throw GeocodingServiceException('Internal error'); | ||
| } | ||
| } |
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