Add stable contract offer id

CHANGELOG.md

@@ -15,6 +15,7 @@ please see [changelog_updates.md](docs/dev/changelog_updates.md).
 
 #### Minor Changes
 - Add new MDS fields and migrate existing MDS asset keys to mobilityDCAT-AP
+- Introduce a stable ID for contracts offers
 
 #### Patch Changes
 - Docs: Enhanced starting a Http-Pull over the EDC-Ui documentation

extensions/wrapper/wrapper/src/main/java/de/sovity/edc/ext/wrapper/WrapperExtensionContextBuilder.java

@@ -206,7 +206,7 @@ public static WrapperExtensionContext buildContext(
                 policyDefinitionService,
                 policyMapper
         );
-        var dataOfferBuilder = new DspDataOfferBuilder(jsonLd);
+        var dataOfferBuilder = new DspDataOfferBuilder(jsonLd, monitor);
         var dspCatalogService = new DspCatalogService(catalogService, dataOfferBuilder);
         var catalogApiService = new CatalogApiService(
                 assetMapper,

extensions/wrapper/wrapper/src/main/java/de/sovity/edc/ext/wrapper/api/ui/pages/contract_agreements/services/ContractAgreementPageCardBuilder.java

@@ -22,7 +22,6 @@
 import de.sovity.edc.ext.wrapper.api.ui.pages.transferhistory.TransferProcessStateService;
 import lombok.NonNull;
 import lombok.RequiredArgsConstructor;
-import lombok.extern.slf4j.Slf4j;
 import org.eclipse.edc.connector.contract.spi.types.agreement.ContractAgreement;
 import org.eclipse.edc.connector.contract.spi.types.negotiation.ContractNegotiation;
 import org.eclipse.edc.connector.transfer.spi.types.TransferProcess;
@@ -35,7 +34,6 @@
 import static de.sovity.edc.ext.wrapper.utils.EdcDateUtils.utcMillisToOffsetDateTime;
 import static de.sovity.edc.ext.wrapper.utils.EdcDateUtils.utcSecondsToOffsetDateTime;
 
-@Slf4j
 @RequiredArgsConstructor
 public class ContractAgreementPageCardBuilder {
     private final PolicyMapper policyMapper;

utils/catalog-parser/src/main/java/de/sovity/edc/utils/catalog/mapper/DspDataOfferBuilder.java

@@ -21,14 +21,23 @@
 import de.sovity.edc.utils.jsonld.vocab.Prop;
 import jakarta.json.Json;
 import jakarta.json.JsonObject;
+import jakarta.json.JsonString;
 import lombok.RequiredArgsConstructor;
+import lombok.val;
 import org.eclipse.edc.jsonld.spi.JsonLd;
+import org.eclipse.edc.spi.monitor.Monitor;
 import org.jetbrains.annotations.NotNull;
 
+import java.io.StringWriter;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.util.Base64;
+
 @RequiredArgsConstructor
 public class DspDataOfferBuilder {
 
     private final JsonLd jsonLd;
+    private final Monitor monitor;
 
     public DspCatalog buildDataOffers(String endpoint, JsonObject json) {
         json = jsonLd.expand(json).orElseThrow(DspCatalogServiceException::ofFailure);
@@ -65,7 +74,50 @@ private DspDataOffer buildDataOffer(JsonObject dataset) {
     }
 
     @NotNull
-    private DspContractOffer buildContractOffer(JsonObject json) {
-        return new DspContractOffer(JsonLdUtils.id(json), json);
+    DspContractOffer buildContractOffer(JsonObject json) {
+        /*
+         * /!\ Workaround
+         * TODO: can't reference a private repo in a public repo
+         * https://github.com/sovity/edc-broker-server-extension/issues/278
+         * https://github.com/sovity/edc-broker-server-extension/issues/409
+         *
+         * The Eclipse EDC uses a new random ID for each contract offer that it returns.
+         * This can't be used as an id.
+         * As a workaround, we must introduce our own ID.
+         * For a first iteration, we will assume that the content of the policy remains the same (same content, same order)
+         * and hash it to use it as a key.
+         */
+
+        String idFieldName = "@id";
+        val id = json.get(idFieldName);
+        val idAsString = (JsonString) id;
+        val parts = idAsString.getString().split(":");
+        if (parts.length != 3) {
+            throw new RuntimeException("Can't use " + idAsString + ": wrong format, must be made of 3 parts.");
+        }
+
+        val sw = new StringWriter();
+        try (val writer = Json.createWriter(sw)) {
+            // FIXME: This doesn't enforce any property order and may cause trouble if the returned policy schema is not consistent
+            //  Use canonical form if needed later.
+            val noId = Json.createObjectBuilder(json).remove(idFieldName).build();
+            writer.write(noId);
+            val policyJsonString = sw.toString();
+            try {
+                val hash = MessageDigest.getInstance("sha-1").digest(policyJsonString.getBytes());
+                val b64 = Base64.getEncoder().encode(hash);
+                val contractId = parts[0];
+                val assetId = parts[1];
+                val policyId = new String(b64);
+                val stableId = contractId + ":" + assetId + ":" + policyId;
+
+                val copy = Json.createObjectBuilder(json).remove(idFieldName).add(idFieldName, stableId).build();
+
+                return new DspContractOffer(stableId, copy);
+            } catch (NoSuchAlgorithmException e) {
+                monitor.severe("Failed to hash with sha-1", e);
+                throw new RuntimeException(e);
+            }
+        }
     }
 }

utils/catalog-parser/src/test/java/de/sovity/edc/utils/catalog/DspCatalogServiceTest.java

@@ -45,7 +45,8 @@ private DspCatalogService newDspCatalogService(String resultJsonFilename) {
 
         var result = CompletableFuture.completedFuture(StatusResult.success(catalogJson.getBytes(StandardCharsets.UTF_8)));
         when(catalogService.requestCatalog(eq(endpoint), eq("dataspace-protocol-http"), eq(QuerySpec.max()))).thenReturn(result);
-        var dataOfferBuilder = new DspDataOfferBuilder(new TitaniumJsonLd(mock(Monitor.class)));
+        var monitor = mock(Monitor.class);
+        var dataOfferBuilder = new DspDataOfferBuilder(new TitaniumJsonLd(monitor), monitor);
 
         return new DspCatalogService(catalogService, dataOfferBuilder);
     }
@@ -71,7 +72,7 @@ void testCatalogMapping() {
 
         assertThat(offer.getContractOffers()).hasSize(1);
         var co = offer.getContractOffers().get(0);
-        assertThat(co.getContractOfferId()).isEqualTo("policy-1");
+        assertThat(co.getContractOfferId()).isEqualTo("contract-id:asset-id:gsA8LIxJakmI9clojmLCfhsh0A4=");
         assertThat(toJson(co.getPolicyJsonLd())).contains("ALWAYS_TRUE");
 
         assertThat(offer.getDistributions()).hasSize(1);

utils/catalog-parser/src/test/java/de/sovity/edc/utils/catalog/mapper/DspDataOfferBuilderTest.java

@@ -0,0 +1,30 @@
+package de.sovity.edc.utils.catalog.mapper;
+
+import jakarta.json.Json;
+import lombok.val;
+import org.eclipse.edc.jsonld.TitaniumJsonLd;
+import org.eclipse.edc.spi.monitor.Monitor;
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.AssertionsForClassTypes.assertThat;
+import static org.mockito.Mockito.mock;
+
+class DspDataOfferBuilderTest {
+    @Test
+    void testCanConvertTheEdcIdToAStableId() {
+        // arrange
+        val contractOffer = Json.createObjectBuilder()
+                .add("@id", "part1:part2:part3")
+                .add("somefield", "somevalue")
+                .build();
+
+        // act
+        val monitor = mock(Monitor.class);
+        val result = new DspDataOfferBuilder(new TitaniumJsonLd(monitor), monitor).buildContractOffer(contractOffer);
+
+        // assert
+        val stableId = "part1:part2:KbdwJ8MGwX3y7K9mi3lhzplluhc=";
+        assertThat(result.getContractOfferId()).isEqualTo(stableId);
+        assertThat(result.getPolicyJsonLd().getString("@id")).isEqualTo(stableId);
+    }
+}

utils/catalog-parser/src/test/resources/de/sovity/edc/utils/catalog/catalogResponse.json

@@ -5,7 +5,7 @@
     "@id": "test-1.0",
     "@type": "dcat:Dataset",
     "odrl:hasPolicy": {
-      "@id": "policy-1",
+      "@id": "contract-id:asset-id:policy-id",
       "@type": "odrl:Set",
       "odrl:permission": {
         "odrl:target": "test-1.0",