Implement basic detail endpoint

src/main/java/com/backend/unifier/title/service/GeneralDetailService.java

@@ -0,0 +1,34 @@
+package com.backend.unifier.title.service;
+
+import java.util.Optional;
+import java.util.UUID;
+
+import com.backend.unifier.title.model.ContentDetailEntry;
+import com.backend.unifier.title.model.ContentIdentifier;
+import com.backend.unifier.title.model.ContentProviderSource;
+
+import jakarta.enterprise.context.ApplicationScoped;
+import jakarta.enterprise.inject.Instance;
+
+@ApplicationScoped
+public class GeneralDetailService {
+    private final IdentifierMaskService maskService;
+    private final Instance<DetailService> detailServices;
+
+    public GeneralDetailService(IdentifierMaskService maskService, Instance<DetailService> detailServices) {
+        this.maskService = maskService;
+        this.detailServices = detailServices;
+    }
+
+    public Optional<ContentDetailEntry> details(UUID id) {
+        ContentIdentifier realIdentifier = maskService.realIdentifier(id);
+        if (realIdentifier == null)
+            throw new IllegalStateException("content identifier not found for id '" + id + "'");
+        ContentProviderSource source = ContentProviderSource.valueOf(realIdentifier.source());
+        for (DetailService detailService : detailServices) {
+            if (detailService.source() == source)
+                return detailService.details(realIdentifier.id());
+        }
+        return Optional.empty();
+    }
+}