Fix native map services and add provider selection

2026-09-11 19:25:09 +02:00
1 parent 56211e4b25
commit 3ea51a6842
@@ -0,0 +1,85 @@
+using System.Globalization;
+using System.Xml.Linq;
+
+namespace LMEMappeCatastaliApp.Services;
+
+public sealed class OfficialCadastreService
+{
+    private const string WfsEndpoint = "https://wfs.cartografia.agenziaentrate.gov.it/inspire/wfs/owfs01.php";
+    private readonly HttpClient _httpClient = new()
+    {
+        Timeout = TimeSpan.FromSeconds(30)
+    };
+
+    public OfficialCadastreService()
+    {
+        _httpClient.DefaultRequestHeaders.UserAgent.ParseAdd("LMEMappeCatastali/0.2");
+        _httpClient.DefaultRequestHeaders.Accept.ParseAdd("application/gml+xml");
+    }
+
+    public async Task<string> GetParcelsNearAsync(
+        double latitude,
+        double longitude,
+        double radiusMeters,
+        CancellationToken cancellationToken = default)
+    {
+        var meters = Math.Clamp(radiusMeters, 2, 30);
+        var deltaLatitude = meters / 111_320d;
+        var longitudeScale = Math.Cos(latitude * Math.PI / 180d);
+        var deltaLongitude = meters / (111_320d * Math.Max(0.1, longitudeScale));
+        var bbox = string.Join(",",
+        [
+            Format(latitude - deltaLatitude),
+            Format(longitude - deltaLongitude),
+            Format(latitude + deltaLatitude),
+            Format(longitude + deltaLongitude)
+        ]);
+
+        var query = new Dictionary<string, string>
+        {
+            ["language"] = "ita",
+            ["SERVICE"] = "WFS",
+            ["VERSION"] = "2.0.0",
+            ["TYPENAMES"] = "CP:CadastralParcel",
+            ["SRSNAME"] = "urn:ogc:def:crs:EPSG::6706",
+            ["BBOX"] = bbox,
+            ["REQUEST"] = "GetFeature",
+            ["COUNT"] = "20"
+        };
+
+        var url = WfsEndpoint + "?" + string.Join("&", query.Select(item =>
+            $"{Uri.EscapeDataString(item.Key)}={Uri.EscapeDataString(item.Value)}"));
+
+        using var response = await _httpClient.GetAsync(url, HttpCompletionOption.ResponseContentRead, cancellationToken);
+        if (!response.IsSuccessStatusCode)
+        {
+            throw new HttpRequestException($"Il servizio WFS AdE ha risposto {((int)response.StatusCode)}.");
+        }
+
+        var xml = await response.Content.ReadAsStringAsync(cancellationToken);
+        ThrowIfExceptionReport(xml);
+        return xml;
+    }
+
+    private static string Format(double value) => value.ToString("R", CultureInfo.InvariantCulture);
+
+    private static void ThrowIfExceptionReport(string xml)
+    {
+        try
+        {
+            var document = XDocument.Parse(xml);
+            var exceptionText = document.Descendants()
+                .FirstOrDefault(element => element.Name.LocalName == "ExceptionText")
+                ?.Value
+                .Trim();
+            if (!string.IsNullOrWhiteSpace(exceptionText))
+            {
+                throw new InvalidOperationException($"Servizio WFS AdE: {exceptionText}");
+            }
+        }
+        catch (System.Xml.XmlException error)
+        {
+            throw new InvalidDataException("Il servizio WFS AdE ha restituito una risposta non valida.", error);
+        }
+    }
+}