New: Use the new metadata structure (coscine/issues#1792)

src/Blob/Controllers/BlobController.cs

-using Coscine.Api.Blob.Util;
 using Coscine.ApiCommons;
 using Coscine.Configuration;
 using Coscine.Database.DataModel;
@@ -36,6 +35,7 @@ namespace Coscine.Api.Blob.Controllers
         private readonly CoscineLogger _coscineLogger;
         private readonly AnalyticsLogObject _analyticsLogObject;
         private readonly RdfStoreConnector _rdfStoreConnector;
+        private readonly CoscineLDPHelper _coscineLDPHelper;
         private readonly string _prefix;
 
         /// <summary>
@@ -54,17 +54,7 @@ namespace Coscine.Api.Blob.Controllers
             _coscineLogger = new CoscineLogger(logger);
             _analyticsLogObject = new AnalyticsLogObject();
             _prefix = _configuration.GetStringAndWait("coscine/global/epic/prefix");
-        }
-
-        /// <summary>
-        /// Generates Id
-        /// </summary>
-        /// <param name="resourceId">Id of the resource</param>
-        /// <param name="path"> Path to file</param>
-        /// <returns> Uri </returns>
-        public Uri GenerateId(string resourceId, string path)
-        {
-            return new CustomUri($"https://hdl.handle.net/{_prefix}/{resourceId}@path={Uri.EscapeDataString(path)}");
+            _coscineLDPHelper = new CoscineLDPHelper(_rdfStoreConnector, _prefix);
         }
 
         /// <summary>
@@ -225,7 +215,7 @@ namespace Coscine.Api.Blob.Controllers
                 return BadRequest("Only one file can be uploaded per request.");
             }
 
-            var id = GenerateId(resourceId, $"/{path}");
+            var id = _coscineLDPHelper.GetId(resourceId, $"/{path}", true);
             if (!_rdfStoreConnector.HasGraph(id))
             {
                 return StatusCode((int)HttpStatusCode.Forbidden,