feat(geo): polygon GeoJSON spatial filter

Дополнение к bbox: ?polygon=<GeoJSON> для произвольных полигонов
(ground stations coverage, custom AOI). Один из bbox/polygon —
взаимоисключающие; передача обоих → 400.

Repository:
- findActiveByPolygonGeoJson native query через PostGIS
  ST_GeomFromGeoJSON(polygon) → ST_SetSRID(_, 4326). DB-side parsing,
  не нужен jts-io-common.

GeoJsonPolygon validator (app-side, structural):
- Парсит JSON, проверяет {"type":"Polygon","coordinates":[[...]]}
- RFC 7946 closed-ring check: first point == last
- >= 4 points в каждом ring (3 вертекса + closing point)
- Поддержка holes (multiple rings)
- Coordinate range validation: lon ∈ [-180,180], lat ∈ [-90,90]
- DoS guards: MAX_JSON_BYTES = 1MB, MAX_POINTS = 50_000
- Canonical re-serialize (whitespace stripped) перед DB

Tests (13 в GeoJsonPolygonTest):
- Valid square + polygon with hole
- Reject empty/null/non-JSON/non-object/wrong-type/missing-coords
- Reject too-few points / unclosed ring
- Reject lon/lat out of range
- Reject malformed point [no lat]
- Reject too-large JSON

Total project tests: 161 → 174.

API now supports:
  GET /api/v1/{dict}/records?bbox=west,south,east,north
  GET /api/v1/{dict}/records?polygon={"type":"Polygon",...}

Альтум-задача (rect AOI) и геопортал (polygon AOI) разблокированы
от client-side full-fetch + filter.

ordinis-domain/src/main/java/cloud/nstart/terravault/ordinis/domain/record/DictionaryRecordRepository.java

@@ -119,4 +119,31 @@ public interface DictionaryRecordRepository extends JpaRepository<DictionaryReco
       @Param("south") double south,
       @Param("east") double east,
       @Param("north") double north);
+
+  /**
+   * Spatial filter по произвольному polygon в формате GeoJSON. PostGIS
+   * {@code ST_GeomFromGeoJSON} парсит на DB-side, ST_SetSRID вешает 4326
+   * (GeoJSON по spec не имеет SRID, нужен explicit cast). GiST index
+   * на geometry колонке используется для ST_Intersects.
+   *
+   * <p>Если GeoJSON malformed, Postgres вернёт SQL error → Hibernate
+   * выбросит DataAccessException → перехватывается в exception handler
+   * как 400 Bad Request.
+   */
+  @Query(value = """
+      SELECT * FROM dictionary_records r
+      WHERE r.dictionary_id = :dictionaryId
+        AND r.data_scope = ANY(CAST(:scopesCsv AS TEXT[]))
+        AND r.valid_from <= :at
+        AND r.valid_to > :at
+        AND r.geometry IS NOT NULL
+        AND ST_Intersects(
+              r.geometry,
+              ST_SetSRID(ST_GeomFromGeoJSON(:polygonGeoJson), 4326))
+      """, nativeQuery = true)
+  List<DictionaryRecord> findActiveByPolygonGeoJson(
+      @Param("dictionaryId") UUID dictionaryId,
+      @Param("scopesCsv") String[] scopesCsv,
+      @Param("at") OffsetDateTime at,
+      @Param("polygonGeoJson") String polygonGeoJson);
 }

ordinis-read-api/src/main/java/cloud/nstart/terravault/ordinis/readapi/service/RecordReadService.java

@@ -107,9 +107,8 @@ public class RecordReadService {
   }
 
   /**
-   * List active records с optional bbox spatial filter. Если {@code bbox}
-   * не null — используется PostGIS {@code ST_Intersects} (GiST index hit).
-   * Записи без geometry колонки автоматически отфильтровываются.
+   * List active records с optional bbox spatial filter.
+   * Backward-compat entry — без polygon.
    */
   @Transactional(readOnly = true)
   public List<FlattenedRecordResponse> listActive(
@@ -118,6 +117,24 @@ public class RecordReadService {
       List<DataScope> allowedScopes,
       OffsetDateTime asOf,
       BoundingBox bbox) {
+    return listActive(dictionaryName, acceptLanguage, allowedScopes, asOf, bbox, null);
+  }
+
+  /**
+   * List active records с optional bbox или polygon GeoJSON spatial filter.
+   * Только один из {@code bbox}/{@code polygonGeoJson} может быть non-null
+   * (caller валидирует). Используется PostGIS {@code ST_Intersects} с
+   * GiST index hit. Записи без geometry колонки автоматически
+   * отфильтровываются.
+   */
+  @Transactional(readOnly = true)
+  public List<FlattenedRecordResponse> listActive(
+      String dictionaryName,
+      String acceptLanguage,
+      List<DataScope> allowedScopes,
+      OffsetDateTime asOf,
+      BoundingBox bbox,
+      String polygonGeoJson) {
 
     DictionaryDefinition def = definitionRepository.findByName(dictionaryName)
         .orElseThrow(() -> new NoSuchElementException("Dictionary not found: " + dictionaryName));
@@ -129,11 +146,14 @@ public class RecordReadService {
 
     OffsetDateTime when = asOf == null ? OffsetDateTime.now() : asOf;
     List<DictionaryRecord> records;
+    String[] scopesCsv = allowedScopes.stream().map(Enum::name).toArray(String[]::new);
     if (bbox != null) {
-      String[] scopesCsv = allowedScopes.stream().map(Enum::name).toArray(String[]::new);
       records = recordRepository.findActiveByBbox(
           def.getId(), scopesCsv, when,
           bbox.west(), bbox.south(), bbox.east(), bbox.north());
+    } else if (polygonGeoJson != null) {
+      records = recordRepository.findActiveByPolygonGeoJson(
+          def.getId(), scopesCsv, when, polygonGeoJson);
     } else {
       records = recordRepository.findActiveByDictionaryAndScopes(
           def.getId(), allowedScopes, when);

ordinis-read-api/src/main/java/cloud/nstart/terravault/ordinis/readapi/spatial/GeoJsonPolygon.java

@@ -0,0 +1,111 @@
+package cloud.nstart.terravault.ordinis.readapi.spatial;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+/**
+ * Минимальная structural валидация GeoJSON Polygon перед передачей в PostGIS.
+ * Не пытаемся parse в JTS — это сделает {@code ST_GeomFromGeoJSON} на
+ * DB-side. Цель этого парсера: отсечь явный мусор (не JSON, не Polygon,
+ * слишком короткий ring) до того как попадём в repository.
+ *
+ * <p>Spec: <a href="https://datatracker.ietf.org/doc/html/rfc7946">RFC 7946</a>.
+ *
+ * <p>Принимаем только {@code {"type":"Polygon","coordinates":[[...]]}}.
+ * MultiPolygon, Feature, FeatureCollection — не поддержано в v1 (consumer
+ * пусть extract'нет первый geometry на своей стороне).
+ */
+public final class GeoJsonPolygon {
+
+  private static final ObjectMapper MAPPER = new ObjectMapper();
+
+  /** Лимит на размер JSON в bytes — защита от DoS. 1 MB достаточно для
+   *  любого вменяемого polygon (1MB ≈ 50k coordinates). */
+  static final int MAX_JSON_BYTES = 1_000_000;
+
+  /** Лимит на coordinate count в exterior ring + holes. */
+  static final int MAX_POINTS = 50_000;
+
+  private GeoJsonPolygon() {}
+
+  /**
+   * Validate + canonicalize. Возвращает уже-канонический JSON string
+   * (whitespace stripped, key order normalized) — этот вариант идёт в
+   * Postgres ST_GeomFromGeoJSON.
+   *
+   * @throws IllegalArgumentException на любую структурную ошибку
+   */
+  public static String validateAndCanonicalize(String rawJson) {
+    if (rawJson == null || rawJson.isBlank()) {
+      throw new IllegalArgumentException("polygon GeoJSON is empty");
+    }
+    if (rawJson.length() > MAX_JSON_BYTES) {
+      throw new IllegalArgumentException(
+          "polygon GeoJSON exceeds " + MAX_JSON_BYTES + " bytes");
+    }
+    JsonNode root;
+    try {
+      root = MAPPER.readTree(rawJson);
+    } catch (Exception e) {
+      throw new IllegalArgumentException("polygon is not valid JSON: " + e.getMessage());
+    }
+    if (!root.isObject()) {
+      throw new IllegalArgumentException("polygon GeoJSON must be an object");
+    }
+    JsonNode type = root.get("type");
+    if (type == null || !"Polygon".equals(type.asText())) {
+      throw new IllegalArgumentException(
+          "polygon GeoJSON type must be \"Polygon\", got: " + (type == null ? "null" : type.asText()));
+    }
+    JsonNode coords = root.get("coordinates");
+    if (coords == null || !coords.isArray() || coords.isEmpty()) {
+      throw new IllegalArgumentException("polygon coordinates must be a non-empty array");
+    }
+
+    int totalPoints = 0;
+    for (int i = 0; i < coords.size(); i++) {
+      JsonNode ring = coords.get(i);
+      if (!ring.isArray() || ring.size() < 4) {
+        throw new IllegalArgumentException(
+            "polygon ring #" + i + " must have >= 4 points (closed linear ring)");
+      }
+      // RFC 7946: first == last
+      JsonNode first = ring.get(0);
+      JsonNode last = ring.get(ring.size() - 1);
+      if (!first.equals(last)) {
+        throw new IllegalArgumentException(
+            "polygon ring #" + i + " must be closed (first point == last point)");
+      }
+      for (int j = 0; j < ring.size(); j++) {
+        JsonNode p = ring.get(j);
+        if (!p.isArray() || p.size() < 2) {
+          throw new IllegalArgumentException(
+              "polygon ring #" + i + " point #" + j + " must be [longitude, latitude]");
+        }
+        double lon = p.get(0).asDouble();
+        double lat = p.get(1).asDouble();
+        if (lon < -180 || lon > 180) {
+          throw new IllegalArgumentException(
+              "longitude " + lon + " out of range [-180, 180] (ring #" + i + " point #" + j + ")");
+        }
+        if (lat < -90 || lat > 90) {
+          throw new IllegalArgumentException(
+              "latitude " + lat + " out of range [-90, 90] (ring #" + i + " point #" + j + ")");
+        }
+        totalPoints++;
+        if (totalPoints > MAX_POINTS) {
+          throw new IllegalArgumentException(
+              "polygon has > " + MAX_POINTS + " points total");
+        }
+      }
+    }
+
+    // Canonical form: whitespace stripped, predictable encoding для
+    // Postgres parsing.
+    try {
+      return MAPPER.writeValueAsString(root);
+    } catch (Exception e) {
+      throw new IllegalStateException("Failed to re-serialize validated GeoJSON", e);
+    }
+  }
+}

ordinis-read-api/src/main/java/cloud/nstart/terravault/ordinis/readapi/web/DictionaryReadController.java

@@ -5,6 +5,7 @@ import cloud.nstart.terravault.ordinis.domain.DataScope;
 import cloud.nstart.terravault.ordinis.readapi.dto.FlattenedRecordResponse;
 import cloud.nstart.terravault.ordinis.readapi.service.RecordReadService;
 import cloud.nstart.terravault.ordinis.readapi.spatial.BoundingBox;
+import cloud.nstart.terravault.ordinis.readapi.spatial.GeoJsonPolygon;
 import io.micrometer.core.instrument.Counter;
 import io.micrometer.core.instrument.MeterRegistry;
 import org.springframework.http.HttpHeaders;
@@ -69,9 +70,11 @@ public class DictionaryReadController {
       @RequestHeader(value = HttpHeaders.ACCEPT_LANGUAGE, required = false) String acceptLanguage,
       @RequestParam(value = "as_scope", required = false) String asScope,
       @RequestParam(value = "at", required = false) OffsetDateTime at,
-      @RequestParam(value = "bbox", required = false) String bboxCsv) {
+      @RequestParam(value = "bbox", required = false) String bboxCsv,
+      @RequestParam(value = "polygon", required = false) String polygonGeoJson) {
 
     BoundingBox bbox = null;
+    String polygon = null;
     if (bboxCsv != null && !bboxCsv.isBlank()) {
       try {
         bbox = BoundingBox.parse(bboxCsv);
@@ -79,9 +82,20 @@ public class DictionaryReadController {
         throw new BadBboxException(e.getMessage());
       }
     }
+    if (polygonGeoJson != null && !polygonGeoJson.isBlank()) {
+      try {
+        polygon = GeoJsonPolygon.validateAndCanonicalize(polygonGeoJson);
+      } catch (IllegalArgumentException e) {
+        throw new BadBboxException("polygon: " + e.getMessage());
+      }
+    }
+    if (bbox != null && polygon != null) {
+      throw new BadBboxException(
+          "Specify either bbox or polygon, not both");
+    }
 
     List<DataScope> scopes = scopeContext.resolveForRead(asScope).stream().toList();
-    var items = service.listActive(dictionaryName, acceptLanguage, scopes, at, bbox);
+    var items = service.listActive(dictionaryName, acceptLanguage, scopes, at, bbox, polygon);
 
     HttpHeaders headers = new HttpHeaders();
     if (!items.isEmpty() && items.get(0)._meta() != null && items.get(0)._meta().locale() != null) {

ordinis-read-api/src/test/java/cloud/nstart/terravault/ordinis/readapi/spatial/GeoJsonPolygonTest.java

@@ -0,0 +1,133 @@
+package cloud.nstart.terravault.ordinis.readapi.spatial;
+
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+
+class GeoJsonPolygonTest {
+
+  // Простой square Moscow ~37.5..37.8, ~55.5..55.8 (closed: first == last)
+  private static final String VALID_SQUARE = """
+      {"type":"Polygon","coordinates":[[
+        [37.5,55.5],[37.8,55.5],[37.8,55.8],[37.5,55.8],[37.5,55.5]
+      ]]}""";
+
+  @Test
+  void acceptsValidPolygon() {
+    String canonical = GeoJsonPolygon.validateAndCanonicalize(VALID_SQUARE);
+    // Whitespace stripped в canonical form
+    assertThat(canonical).doesNotContain("\n");
+    assertThat(canonical).contains("\"type\":\"Polygon\"");
+    assertThat(canonical).contains("\"coordinates\"");
+  }
+
+  @Test
+  void acceptsPolygonWithHole() {
+    String withHole = """
+        {"type":"Polygon","coordinates":[
+          [[0,0],[10,0],[10,10],[0,10],[0,0]],
+          [[2,2],[3,2],[3,3],[2,3],[2,2]]
+        ]}""";
+    String canonical = GeoJsonPolygon.validateAndCanonicalize(withHole);
+    assertThat(canonical).contains("Polygon");
+  }
+
+  @Test
+  void rejectsEmpty() {
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(""))
+        .isInstanceOf(IllegalArgumentException.class)
+        .hasMessageContaining("empty");
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(null))
+        .isInstanceOf(IllegalArgumentException.class);
+  }
+
+  @Test
+  void rejectsNonJson() {
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize("not json {{"))
+        .hasMessageContaining("not valid JSON");
+  }
+
+  @Test
+  void rejectsNonObjectRoot() {
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize("[]"))
+        .hasMessageContaining("must be an object");
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize("\"hello\""))
+        .hasMessageContaining("must be an object");
+  }
+
+  @Test
+  void rejectsWrongType() {
+    String point = """
+        {"type":"Point","coordinates":[37.5,55.5]}""";
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(point))
+        .hasMessageContaining("type must be \"Polygon\"");
+  }
+
+  @Test
+  void rejectsMissingCoordinates() {
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize("{\"type\":\"Polygon\"}"))
+        .hasMessageContaining("coordinates");
+  }
+
+  @Test
+  void rejectsTooFewPointsInRing() {
+    String triangle = """
+        {"type":"Polygon","coordinates":[[
+          [0,0],[1,0],[0,0]
+        ]]}""";
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(triangle))
+        .hasMessageContaining(">= 4 points");
+  }
+
+  @Test
+  void rejectsUnclosedRing() {
+    String unclosed = """
+        {"type":"Polygon","coordinates":[[
+          [0,0],[1,0],[1,1],[0,1]
+        ]]}""";
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(unclosed))
+        .hasMessageContaining("must be closed");
+  }
+
+  @Test
+  void rejectsLongitudeOutOfRange() {
+    String bad = """
+        {"type":"Polygon","coordinates":[[
+          [-181,0],[1,0],[1,1],[0,1],[-181,0]
+        ]]}""";
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(bad))
+        .hasMessageContaining("longitude");
+  }
+
+  @Test
+  void rejectsLatitudeOutOfRange() {
+    String bad = """
+        {"type":"Polygon","coordinates":[[
+          [0,91],[1,0],[1,1],[0,1],[0,91]
+        ]]}""";
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(bad))
+        .hasMessageContaining("latitude");
+  }
+
+  @Test
+  void rejectsPointWithoutLatitude() {
+    String bad = """
+        {"type":"Polygon","coordinates":[[
+          [0],[1,0],[1,1],[0,1],[0]
+        ]]}""";
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(bad))
+        .hasMessageContaining("[longitude, latitude]");
+  }
+
+  @Test
+  void rejectsTooLargeJson() {
+    StringBuilder huge = new StringBuilder("{\"type\":\"Polygon\",\"coordinates\":[[");
+    while (huge.length() < GeoJsonPolygon.MAX_JSON_BYTES) {
+      huge.append("[0,0],");
+    }
+    huge.append("[0,0]]]}");
+    assertThatThrownBy(() -> GeoJsonPolygon.validateAndCanonicalize(huge.toString()))
+        .hasMessageContaining("exceeds");
+  }
+}