86 lines
3.0 KiB
C#
86 lines
3.0 KiB
C#
using System.Globalization;
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using System.Xml.Linq;
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namespace LMEMappeCatastaliApp.Services;
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public sealed class OfficialCadastreService
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{
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private const string WfsEndpoint = "https://wfs.cartografia.agenziaentrate.gov.it/inspire/wfs/owfs01.php";
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private readonly HttpClient _httpClient = new()
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{
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Timeout = TimeSpan.FromSeconds(30)
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};
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public OfficialCadastreService()
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{
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_httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("LMEMappeCatastali/0.2");
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_httpClient.DefaultRequestHeaders.Accept.ParseAdd("application/gml+xml");
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}
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public async Task<string> GetParcelsNearAsync(
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double latitude,
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double longitude,
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double radiusMeters,
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CancellationToken cancellationToken = default)
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{
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var meters = Math.Clamp(radiusMeters, 2, 30);
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var deltaLatitude = meters / 111_320d;
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var longitudeScale = Math.Cos(latitude * Math.PI / 180d);
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var deltaLongitude = meters / (111_320d * Math.Max(0.1, longitudeScale));
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var bbox = string.Join(",",
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[
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Format(latitude - deltaLatitude),
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Format(longitude - deltaLongitude),
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Format(latitude + deltaLatitude),
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Format(longitude + deltaLongitude)
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]);
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var query = new Dictionary<string, string>
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{
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["language"] = "ita",
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["SERVICE"] = "WFS",
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["VERSION"] = "2.0.0",
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["TYPENAMES"] = "CP:CadastralParcel",
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["SRSNAME"] = "urn:ogc:def:crs:EPSG::6706",
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["BBOX"] = bbox,
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["REQUEST"] = "GetFeature",
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["COUNT"] = "100"
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};
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var url = WfsEndpoint + "?" + string.Join("&", query.Select(item =>
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$"{Uri.EscapeDataString(item.Key)}={Uri.EscapeDataString(item.Value)}"));
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using var response = await _httpClient.GetAsync(url, HttpCompletionOption.ResponseContentRead, cancellationToken);
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if (!response.IsSuccessStatusCode)
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{
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throw new HttpRequestException($"Il servizio WFS AdE ha risposto {((int)response.StatusCode)}.");
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}
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var xml = await response.Content.ReadAsStringAsync(cancellationToken);
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ThrowIfExceptionReport(xml);
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return xml;
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}
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private static string Format(double value) => value.ToString("R", CultureInfo.InvariantCulture);
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private static void ThrowIfExceptionReport(string xml)
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{
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try
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{
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var document = XDocument.Parse(xml);
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var exceptionText = document.Descendants()
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.FirstOrDefault(element => element.Name.LocalName == "ExceptionText")
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?.Value
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.Trim();
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if (!string.IsNullOrWhiteSpace(exceptionText))
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{
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throw new InvalidOperationException($"Servizio WFS AdE: {exceptionText}");
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}
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}
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catch (System.Xml.XmlException error)
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{
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throw new InvalidDataException("Il servizio WFS AdE ha restituito una risposta non valida.", error);
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}
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}
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}
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