src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetPropsController.java

@@ -0,0 +1,42 @@
+package net.hostsharing.hsadminng.hs.hosting.asset;
+
+import net.hostsharing.hsadminng.hs.hosting.asset.validator.HsHostingAssetValidator;
+import net.hostsharing.hsadminng.hs.hosting.generated.api.v1.api.HsHostingAssetPropsApi;
+import net.hostsharing.hsadminng.hs.hosting.generated.api.v1.model.HsHostingAssetTypeResource;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.List;
+import java.util.Map;
+
+
+@RestController
+public class HsHostingAssetPropsController implements HsHostingAssetPropsApi {
+
+    @Override
+    public ResponseEntity<List<String>> listAssetTypes() {
+        final var resource = HsHostingAssetValidator.types().stream()
+                .map(Enum::name)
+                .toList();
+        return ResponseEntity.ok(resource);
+    }
+
+    @Override
+    public ResponseEntity<List<Object>> listAssetTypeProps(
+            final HsHostingAssetTypeResource assetType) {
+
+        final var propValidators = HsHostingAssetValidator.forType(HsHostingAssetType.of(assetType));
+//        final List<Map<String, Object>> resource = propValidators.properties()
+//                .stream()
+//                .map(HsHostingAssetPropsController::simplifyTypeProperty)
+//                .toList();
+        final List<Map<String, Object>> resource = propValidators.properties();
+        return ResponseEntity.ok((List)resource);
+    }
+
+//    private static Map<String, Object> simplifyTypeProperty(Map<String, Object> source) {
+//        final var target = new LinkedHashMap<>(source);
+//        target.put("type", source,)
+//        return target;
+//    }
+}

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validator/HsHostingAssetPropertyValidator.java

@@ -1,5 +1,6 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validator;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import lombok.RequiredArgsConstructor;
 import lombok.Setter;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
@@ -59,6 +60,14 @@ public abstract class HsHostingAssetPropertyValidator<T> {
             throw new IllegalStateException(typeDef.getKey() + "[" + propertyName + "] not fully initialized, please call either .required() or .optional()" );
         }
     }
+
+    public Map<String, Object> toMap(final ObjectMapper mapper) {
+        final Map<String, Object> map = mapper.convertValue(this, Map.class);
+        map.put("type", simpleTypeName());
+        return map;
+    }
+
+    protected abstract String simpleTypeName();
 }
 
 @Setter
@@ -90,6 +99,11 @@ class IntegerPropertyValidator extends HsHostingAssetPropertyValidator<Integer>{
             result.add("'" + propertyName + "' is expected to be multiple of " + step + " but is " + propValue);
         }
     }
+
+    @Override
+    protected String simpleTypeName() {
+        return "integer";
+    }
 }
 
 @Setter
@@ -116,6 +130,11 @@ class EnumPropertyValidator extends HsHostingAssetPropertyValidator<String> {
             result.add("'" + propertyName + "' is expected to be one of " + Arrays.toString(values) + " but is '" + propValue + "'");
         }
     }
+
+    @Override
+    protected String simpleTypeName() {
+        return "enumeration";
+    }
 }
 
 @Setter
@@ -145,4 +164,9 @@ class BooleanPropertyValidator extends HsHostingAssetPropertyValidator<Boolean>
             }
         }
     }
+
+    @Override
+    protected String simpleTypeName() {
+        return "boolean";
+    }
 }

src/main/java/net/hostsharing/hsadminng/hs/hosting/asset/validator/HsHostingAssetValidator.java

@@ -1,11 +1,16 @@
 package net.hostsharing.hsadminng.hs.hosting.asset.validator;
 
+import com.fasterxml.jackson.annotation.JsonAutoDetect;
+import com.fasterxml.jackson.annotation.PropertyAccessor;
+import com.fasterxml.jackson.databind.ObjectMapper;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetEntity;
 import net.hostsharing.hsadminng.hs.hosting.asset.HsHostingAssetType;
 
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 
 import static java.util.Arrays.stream;
 import static net.hostsharing.hsadminng.hs.hosting.asset.validator.EnumPropertyValidator.enumProperty;
@@ -60,6 +65,10 @@ public class HsHostingAssetValidator {
         propertyValidators = validators;
     }
 
+    public static Set<HsHostingAssetType> types() {
+        return validators.keySet();
+    }
+
     public List<String> validate(final HsHostingAssetEntity assetEntity) {
         final var result = new ArrayList<String>();
         assetEntity.getConfig().keySet().forEach( givenPropName -> {
@@ -72,4 +81,19 @@ public class HsHostingAssetValidator {
         });
         return result;
     }
+
+    public List<Map<String, Object>> properties() {
+        final var mapper = new ObjectMapper();
+        mapper.setVisibility(PropertyAccessor.FIELD, JsonAutoDetect.Visibility.ANY);
+        return Arrays.stream(propertyValidators)
+                .map(propertyValidator -> propertyValidator.toMap(mapper))
+                .map(HsHostingAssetValidator::asKeyValueMap)
+                .toList();
+    }
+
+    @SuppressWarnings({ "unchecked", "rawtypes" })
+    private static Map<String, Object> asKeyValueMap(final Map map) {
+        return (Map<String, Object>) map;
+    }
+
 }

src/main/resources/api-definition/hs-hosting/hs-hosting-asset-schemas.yaml

@@ -80,18 +80,11 @@ components:
             # forces generating a java.lang.Object containing a Map, instead of class AssetConfiguration
             anyOf:
                 - type: object
-                  properties:
-                    CPU:
-                        type: integer
-                        minimum: 1
-                        maximum: 16
-                    SSD:
-                        type: integer
-                        minimum: 16
-                        maximum: 4096
-                    HDD:
-                        type: integer
-                        minimum: 16
-                        maximum: 4096
                   additionalProperties: true
 
+        HsHostingAssetProps:
+            # FIXME: add proper schema spec
+            anyOf:
+            - type: object
+              additionalProperties: true
+

src/main/resources/api-definition/hs-hosting/hs-hosting-asset-types-props.yaml

@@ -0,0 +1,26 @@
+get:
+    summary: Returns a list of available asset properties for the given type.
+    description: Returns the list of available properties and their validations for a given asset type.
+    tags:
+        - hs-hosting-asset-props
+    operationId: listAssetTypeProps
+    parameters:
+        - name: assetType
+          in: path
+          required: true
+          schema:
+              $ref: 'hs-hosting-asset-schemas.yaml#/components/schemas/HsHostingAssetType'
+          description: The asset type whose properties are to be returned.
+    responses:
+        "200":
+            description: OK
+            content:
+                'application/json':
+                    schema:
+                        type: array
+                        items:
+                            $ref: 'hs-hosting-asset-schemas.yaml#/components/schemas/HsHostingAssetProps'
+        "401":
+            $ref: 'error-responses.yaml#/components/responses/Unauthorized'
+        "403":
+            $ref: 'error-responses.yaml#/components/responses/Forbidden'

src/main/resources/api-definition/hs-hosting/hs-hosting-asset-types.yaml

@@ -0,0 +1,19 @@
+get:
+    summary: Returns a list of available asset types.
+    description: Returns the list of asset types to enable an adaptive UI.
+    tags:
+        - hs-hosting-asset-props
+    operationId: listAssetTypes
+    responses:
+        "200":
+            description: OK
+            content:
+                'application/json':
+                    schema:
+                        type: array
+                        items:
+                            type: string
+        "401":
+            $ref: 'error-responses.yaml#/components/responses/Unauthorized'
+        "403":
+            $ref: 'error-responses.yaml#/components/responses/Forbidden'

src/main/resources/api-definition/hs-hosting/hs-hosting-assets.yaml

@@ -13,18 +13,20 @@ get:
           schema:
               type: string
               format: uuid
+          description: The UUID of the debitor, whose hosting assets are to be listed.
         - name: parentAssetUuid
           in: query
           required: false
           schema:
               type: string
               format: uuid
+          description: The UUID of the parentAsset, whose hosting assets are to be listed.
         - name: type
           in: query
           required: false
           schema:
               $ref: 'hs-hosting-asset-schemas.yaml#/components/schemas/HsHostingAssetType'
-          description: The UUID of the debitor, whose hosting assets are to be listed.
+          description: The type of hosting assets to be listed.
     responses:
         "200":
             description: OK

src/main/resources/api-definition/hs-hosting/hs-hosting.yaml

@@ -8,10 +8,16 @@ servers:
 
 paths:
 
-  # Items
+  # Assets
 
   /api/hs/hosting/assets:
     $ref: "hs-hosting-assets.yaml"
 
   /api/hs/hosting/assets/{assetUuid}:
     $ref: "hs-hosting-assets-with-uuid.yaml"
+
+  /api/hs/hosting/asset-types:
+    $ref: "hs-hosting-asset-types.yaml"
+
+  /api/hs/hosting/asset-types/{assetType}:
+    $ref: "hs-hosting-asset-types-props.yaml"

src/test/java/net/hostsharing/hsadminng/hs/hosting/asset/HsHostingAssetPropsControllerAcceptanceTest.java

@@ -0,0 +1,156 @@
+package net.hostsharing.hsadminng.hs.hosting.asset;
+
+import io.restassured.RestAssured;
+import net.hostsharing.hsadminng.HsadminNgApplication;
+import net.hostsharing.hsadminng.rbac.test.JpaAttempt;
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.server.LocalServerPort;
+
+import static net.hostsharing.hsadminng.rbac.test.JsonMatcher.lenientlyEquals;
+
+@SpringBootTest(
+        webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
+        classes = { HsadminNgApplication.class, JpaAttempt.class }
+)
+class HsHostingAssetPropsControllerAcceptanceTest {
+
+    @LocalServerPort
+    private Integer port;
+
+    @Test
+    void anyone_canListAvailableAssetTypes() {
+
+        RestAssured // @formatter:off
+                .given()
+                .port(port)
+                .when()
+                .get("http://localhost/api/hs/hosting/asset-types")
+                .then().log().all().assertThat()
+                .statusCode(200)
+                .contentType("application/json")
+                .body("", lenientlyEquals("""
+                    [
+                        "MANAGED_SERVER",
+                        "MANAGED_WEBSPACE",
+                        "CLOUD_SERVER"
+                    ]
+                    """));
+        // @formatter:on
+    }
+
+    @Test
+    void globalAdmin_canListPropertiesOfGivenAssetType() {
+
+        RestAssured // @formatter:off
+                .given()
+                .port(port)
+                .when()
+                .get("http://localhost/api/hs/hosting/asset-types/" + HsHostingAssetType.MANAGED_SERVER)
+                .then().log().all().assertThat()
+                .statusCode(200)
+                .contentType("application/json")
+                .body("", lenientlyEquals("""
+                    [
+                         {
+                             "type": "integer",
+                             "propertyName": "CPUs",
+                             "required": true,
+                             "unit": null,
+                             "min": 1,
+                             "max": 32,
+                             "step": null
+                         },
+                         {
+                             "type": "integer",
+                             "propertyName": "RAM",
+                             "required": true,
+                             "unit": "GB",
+                             "min": 1,
+                             "max": 128,
+                             "step": null
+                         },
+                         {
+                             "type": "integer",
+                             "propertyName": "SSD",
+                             "required": true,
+                             "unit": "GB",
+                             "min": 25,
+                             "max": 1000,
+                             "step": 25
+                         },
+                         {
+                             "type": "integer",
+                             "propertyName": "HDD",
+                             "required": false,
+                             "unit": "GB",
+                             "min": 0,
+                             "max": 4000,
+                             "step": 250
+                         },
+                         {
+                             "type": "integer",
+                             "propertyName": "Traffic",
+                             "required": true,
+                             "unit": "GB",
+                             "min": 250,
+                             "max": 10000,
+                             "step": 250
+                         },
+                         {
+                             "type": "enumeration",
+                             "propertyName": "SLA-Platform",
+                             "required": false,
+                             "values": [
+                                 "BASIC",
+                                 "EXT8H",
+                                 "EXT4H",
+                                 "EXT2H"
+                             ]
+                         },
+                         {
+                             "type": "boolean",
+                             "propertyName": "SLA-EMail",
+                             "required": false,
+                             "falseIf": {
+                                 "SLA-Platform": "BASIC"
+                             }
+                         },
+                         {
+                             "type": "boolean",
+                             "propertyName": "SLA-Maria",
+                             "required": false,
+                             "falseIf": {
+                                 "SLA-Platform": "BASIC"
+                             }
+                         },
+                         {
+                             "type": "boolean",
+                             "propertyName": "SLA-PgSQL",
+                             "required": false,
+                             "falseIf": {
+                                 "SLA-Platform": "BASIC"
+                             }
+                         },
+                         {
+                             "type": "boolean",
+                             "propertyName": "SLA-Office",
+                             "required": false,
+                             "falseIf": {
+                                 "SLA-Platform": "BASIC"
+                             }
+                         },
+                         {
+                             "type": "boolean",
+                             "propertyName": "SLA-Web",
+                             "required": false,
+                             "falseIf": {
+                                "SLA-Platform": "BASIC"
+                            }
+                        }
+                    ]
+                    """));
+        // @formatter:on
+    }
+
+}