add new wot-models definition update endpoint #1843

base/model/src/main/java/org/eclipse/ditto/base/model/headers/AbstractDittoHeaders.java

@@ -263,6 +263,11 @@ public boolean isDryRun() {
         return isExpectedBoolean(DittoHeaderDefinition.DRY_RUN, Boolean.TRUE);
     }
 
+    @Override
+    public boolean isExternalDryRun() {
+        return isExpectedBoolean(DittoHeaderDefinition.EXTERNAL_DRY_RUN, Boolean.TRUE);
+    }
+
     @Override
     public boolean isSudo() {
         return isExpectedBoolean(DittoHeaderDefinition.DITTO_SUDO, Boolean.TRUE);

base/model/src/main/java/org/eclipse/ditto/base/model/headers/DittoHeaderDefinition.java

@@ -68,6 +68,16 @@ public enum DittoHeaderDefinition implements HeaderDefinition {
      */
     DRY_RUN("ditto-dry-run", boolean.class, false, false, HeaderValueValidators.getBooleanValidator()),
 
+    /**
+     * Header definition for specifying dry-run behavior from external clients.
+     * <p>
+     * Key: {@code "dry-run"}, Java type: {@code boolean}.
+     * </p>
+     *
+     * @since 3.7.0
+     */
+    EXTERNAL_DRY_RUN("dry-run", boolean.class, true, true, HeaderValueValidators.getBooleanValidator()),
+
     /**
      * Header definition for read subjects value.
      * <p>

base/model/src/main/java/org/eclipse/ditto/base/model/headers/DittoHeaders.java

@@ -197,6 +197,14 @@ static DittoHeadersBuilder newBuilder(final JsonObject jsonObject) {
      */
     boolean isDryRun();
 
+    /**
+     * Returns whether a command is to be executed as a dry-run from an external request.
+     *
+     * @return {@code true} if dry-run is specified externally, {@code false} otherwise.
+     * @since 3.7.0
+     */
+    boolean isExternalDryRun();
+
     /**
      * Indicates whether this command is flagged as sudo command which should ignore some preventions.
      *

base/model/src/main/java/org/eclipse/ditto/base/model/signals/commands/Command.java

@@ -150,6 +150,13 @@ enum Category {
          */
         MERGE,
 
+        /**
+         * Category of commands that change the state of entities.
+         *
+         * @since 3.7.0
+         */
+        MIGRATE,
+
         /**
          * Category of commands that delete entities.
          */

base/model/src/test/java/org/eclipse/ditto/base/model/headers/ImmutableDittoHeadersTest.java

@@ -117,6 +117,7 @@ public final class ImmutableDittoHeadersTest {
     private static final String KNOWN_TRACEPARENT = "00-dfca0d990402884d22e909a87ac677ec-94fc4da95e842f96-01";
     private static final String KNOWN_TRACESTATE = "eclipse=ditto";
     private static final boolean KNOWN_DITTO_RETRIEVE_DELETED = true;
+    private static final boolean KNOWN_DITTO_EXTERNAL_DRY_RUN = true;
     private static final String KNOWN_DITTO_ACKREGATOR_ADDRESS = "here!";
 
     private static final String KNOWN_DITTO_GET_METADATA = "attributes/*/key";
@@ -224,6 +225,7 @@ public void settingAllKnownHeadersWorksAsExpected() {
                         KNOWN_PRE_DEFINED_EXTRA_FIELDS_READ_GRANT_OBJECT.formatAsString())
                 .putHeader(DittoHeaderDefinition.PRE_DEFINED_EXTRA_FIELDS_OBJECT.getKey(),
                         KNOWN_PRE_DEFINED_EXTRA_FIELDS_OBJECT.formatAsString())
+                .putHeader(DittoHeaderDefinition.EXTERNAL_DRY_RUN.getKey(), String.valueOf(KNOWN_DITTO_EXTERNAL_DRY_RUN))
                 .build();
 
         assertThat(underTest).isEqualTo(expectedHeaderMap);
@@ -534,7 +536,6 @@ public void toJsonReturnsExpected() {
                 .set(DittoHeaderDefinition.CONNECTION_ID.getKey(), KNOWN_CONNECTION_ID)
                 .set(DittoHeaderDefinition.EXPECTED_RESPONSE_TYPES.getKey(),
                         charSequencesToJsonArray(KNOWN_EXPECTED_RESPONSE_TYPES))
-                .set(DittoHeaderDefinition.PUT_METADATA.getKey(), KNOWN_METADATA_HEADERS.toJson())
                 .set(DittoHeaderDefinition.ALLOW_POLICY_LOCKOUT.getKey(), KNOWN_ALLOW_POLICY_LOCKOUT)
                 .set(DittoHeaderDefinition.WEAK_ACK.getKey(), KNOWN_IS_WEAK_ACK)
                 .set(DittoHeaderDefinition.EVENT_JOURNAL_TAGS.getKey(),
@@ -548,8 +549,6 @@ public void toJsonReturnsExpected() {
                 .set(DittoHeaderDefinition.LIVE_CHANNEL_CONDITION.getKey(), KNOWN_LIVE_CHANNEL_CONDITION)
                 .set(DittoHeaderDefinition.LIVE_CHANNEL_CONDITION_MATCHED.getKey(),
                         KNOWN_LIVE_CHANNEL_CONDITION_MATCHED)
-                .set(DittoHeaderDefinition.GET_METADATA.getKey(), KNOWN_DITTO_GET_METADATA)
-                .set(DittoHeaderDefinition.DELETE_METADATA.getKey(), KNOWN_DITTO_DELETE_METADATA)
                 .set(DittoHeaderDefinition.DITTO_METADATA.getKey(), KNOWN_DITTO_METADATA)
                 .set(DittoHeaderDefinition.AT_HISTORICAL_REVISION.getKey(), KNOWN_AT_HISTORICAL_REVISION)
                 .set(DittoHeaderDefinition.AT_HISTORICAL_TIMESTAMP.getKey(), KNOWN_AT_HISTORICAL_TIMESTAMP.toString())
@@ -560,6 +559,10 @@ public void toJsonReturnsExpected() {
                         KNOWN_PRE_DEFINED_EXTRA_FIELDS_READ_GRANT_OBJECT)
                 .set(DittoHeaderDefinition.PRE_DEFINED_EXTRA_FIELDS_OBJECT.getKey(),
                         KNOWN_PRE_DEFINED_EXTRA_FIELDS_OBJECT)
+                .set(DittoHeaderDefinition.EXTERNAL_DRY_RUN.getKey(), KNOWN_DITTO_EXTERNAL_DRY_RUN)
+                .set(DittoHeaderDefinition.PUT_METADATA.getKey(), KNOWN_METADATA_HEADERS.toJson())
+                .set(DittoHeaderDefinition.GET_METADATA.getKey(), KNOWN_DITTO_GET_METADATA)
+                .set(DittoHeaderDefinition.DELETE_METADATA.getKey(), KNOWN_DITTO_DELETE_METADATA)
                 .build();
 
         final Map<String, String> allKnownHeaders = createMapContainingAllKnownHeaders();
@@ -806,6 +809,8 @@ private static Map<String, String> createMapContainingAllKnownHeaders() {
                 KNOWN_PRE_DEFINED_EXTRA_FIELDS_READ_GRANT_OBJECT.formatAsString());
         result.put(DittoHeaderDefinition.PRE_DEFINED_EXTRA_FIELDS_OBJECT.getKey(),
                 KNOWN_PRE_DEFINED_EXTRA_FIELDS_OBJECT.formatAsString());
+        result.put(DittoHeaderDefinition.EXTERNAL_DRY_RUN.getKey(),
+                String.valueOf(KNOWN_DITTO_EXTERNAL_DRY_RUN));
 
         return result;
     }

documentation/src/main/resources/openapi/ditto-api-2.yml

@@ -739,6 +739,101 @@ paths:
           $ref: '#/components/responses/PreconditionFailed'
         '424':
           $ref: '#/components/responses/DependencyFailed'
+  '/api/2/things/{thingId}/migrateDefinition':
+    post:
+      summary: Update the definition of an existing Thing
+      description: |-
+        Updates the definition of the specified thing by providing a new definition URL along with an optional migration payload.
+
+        The request body allows specifying:
+        - A new Thing definition URL.
+        - A migration payload containing updates to attributes and features.
+        - Patch conditions to ensure consistent updates.
+        - Whether properties should be initialized if missing.
+
+        If the `dry-run` query parameter or header is set to `true`, the request will return the calculated migration result without applying any changes.
+
+        ### Example:
+        ```json
+        {
+          "thingDefinitionUrl": "https://example.com/new-thing-definition.json",
+          "migrationPayload": {
+            "attributes": {
+              "manufacturer": "New Corp"
+            },
+            "features": {
+              "sensor": {
+                "properties": {
+                  "status": {
+                    "temperature": {
+                      "value": 25.0
+                    }
+                  }
+                }
+              }
+            }
+          },
+          "patchConditions": {
+            "thing:/features/sensor": "not(exists(/features/sensor))"
+          },
+          "initializeMissingPropertiesFromDefaults": true
+        }
+        ```
+      tags:
+        - Things
+      parameters:
+        - $ref: '#/components/parameters/ThingIdPathParam'
+        - name: dry-run
+          in: query
+          description: 'If set to `true`, performs a dry-run and returns the migration result without applying changes.'
+          required: false
+          schema:
+            type: boolean
+            default: false
+      requestBody:
+        description: 'JSON payload containing the new definition URL, migration payload, patch conditions, and initialization flag.'
+        required: true
+        content:
+          application/json:
+            schema:
+              $ref: '#/components/requestBodies/MigrateThingDefinitionRequest/content/application~1json/schema'
+      responses:
+        '200':
+          description: 'The thing definition was successfully updated, and the updated Thing is returned.'
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/responses/MigrateThingDefinitionResponse/content/application~1json/schema'
+        '202':
+          description: Dry-run successful. The migration result is returned without applying changes.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/responses/MigrateThingDefinitionResponse/content/application~1json/schema'
+        '400':
+          description: The request could not be processed due to invalid input.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/AdvancedError'
+        '401':
+          description: Unauthorized request due to missing authentication.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/AdvancedError'
+        '404':
+          description: The specified thing could not be found.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/AdvancedError'
+        '412':
+          description: The update conditions were not met.
+          content:
+            application/json:
+              schema:
+                $ref: '#/components/schemas/AdvancedError'
   '/api/2/things/{thingId}/definition':
     get:
       summary: Retrieve the definition of a specific thing
@@ -8212,6 +8307,59 @@ components:
               randomizationInterval: 5m
       description: Optional request payload for `activateTokenIntegration` policy action.
       required: false
+    MigrateThingDefinitionRequest:
+      content:
+        application/json:
+          schema:
+            type: object
+            description: JSON payload to migrate the definition of a Thing.
+            properties:
+              thingDefinitionUrl:
+                type: string
+                format: uri
+                description: The URL of the new Thing definition to be applied.
+                example: 'https://models.example.com/thing-definition-1.0.0.tm.jsonld'
+              migrationPayload:
+                type: object
+                description: Optional migration payload with updates to attributes and features.
+                properties:
+                  attributes:
+                    type: object
+                    additionalProperties: true
+                    description: Attributes to be updated in the thing.
+                    example:
+                      manufacturer: New Corp
+                      location: 'Berlin, main floor'
+                  features:
+                    type: object
+                    additionalProperties:
+                      type: object
+                      properties:
+                        properties:
+                          type: object
+                          additionalProperties: true
+                    description: Features to be updated in the thing.
+                    example:
+                      thermostat:
+                        properties:
+                          status:
+                            temperature:
+                              value: 23.5
+                              unit: DEGREE_CELSIUS
+              patchConditions:
+                type: object
+                description: Optional conditions to apply the migration only if the existing thing matches the specified values.
+                additionalProperties:
+                  type: string
+                example:
+                  'thing:/features/thermostat': not(exists(/features/thermostat))
+              initializeMissingPropertiesFromDefaults:
+                type: boolean
+                description: Flag indicating whether missing properties should be initialized with default values.
+                example: true
+                default: false
+            required:
+              - thingDefinitionUrl
   responses:
     EntityTooLarge:
       description: The created or modified entity is larger than the accepted limit of 100 kB.
@@ -8300,6 +8448,41 @@ components:
         application/json:
           schema:
             $ref: '#/components/schemas/ModuleUpdatedLogLevel'
+    MigrateThingDefinitionResponse:
+      description: 'The thing definition was successfully updated, and the updated Thing is returned.'
+      content:
+        application/json:
+          schema:
+            type: object
+            description: Response payload after applying or simulating a migration to a Thing.
+            properties:
+              thingId:
+                type: string
+                description: Unique identifier representing the migrated Thing.
+              patch:
+                type: object
+                description: The patch containing updates to the Thing.
+                properties:
+                  definition:
+                    $ref: '#/components/schemas/Definition'
+                  attributes:
+                    $ref: '#/components/schemas/Attributes'
+                  features:
+                    $ref: '#/components/schemas/Features'
+              mergeStatus:
+                type: string
+                description: |
+                  Indicates the result of the migration process.
+                  - `APPLIED`: The migration was successfully applied.
+                  - `DRY_RUN`: The migration result was calculated but not applied.
+                enum:
+                  - APPLIED
+                  - DRY_RUN
+                example: APPLIED
+            required:
+              - thingId
+              - patch
+              - mergeStatus
   parameters:
     AllowPolicyLockoutParam:
       name: allow-policy-lockout

documentation/src/main/resources/openapi/sources/api-2-index.yml

@@ -60,6 +60,8 @@ paths:
     $ref: "./paths/things/index.yml"
   '/api/2/things/{thingId}':
     $ref: "./paths/things/thing.yml"
+  '/api/2/things/{thingId}/migrateDefinition':
+    $ref: "./paths/things/migrateDefinition.yml"
   '/api/2/things/{thingId}/definition':
     $ref: "./paths/things/definition.yml"
   '/api/2/things/{thingId}/policyId':
@@ -214,6 +216,11 @@ components:
       $ref: "./requests/patchValue.yml"
     ActivateTokenIntegration:
       $ref: "./requests/policies/actions/activateTokenIntegration.yml"
+    MigrateThingDefinitionRequest:
+      content:
+        application/json:
+          schema:
+            $ref: "./requests/things/migrateThingDefinitionRequest.yml"
 
   responses:
     EntityTooLarge:
@@ -230,6 +237,12 @@ components:
       $ref: "./responses/successUpdateLogLevel.yml"
     SuccessUpdateLogLevelSinglePod:
       $ref: "./responses/successUpdateLogLevelSinglePod.yml"
+    MigrateThingDefinitionResponse:
+      description: The thing definition was successfully updated, and the updated Thing is returned.
+      content:
+        application/json:
+          schema:
+            $ref: "./responses/things/migrateThingDefinitionResponse.yml"
 
   parameters:
     AllowPolicyLockoutParam: