Update: Extend with a Mimetype attribute

src/Tree/Controllers/TreeController.cs

@@ -24,7 +24,6 @@ using System.Threading.Tasks;
 using System.Web;
 using VDS.RDF;
 using VDS.RDF.Parsing;
-using VDS.RDF.Writing;
 
 namespace Coscine.Api.Tree.Controllers
 {
@@ -101,9 +100,10 @@ namespace Coscine.Api.Tree.Controllers
         /// </summary>
         /// <param name="resourceId"> Id of a resource</param>
         /// <param name="path">Path to the file</param>
+        /// <param name="mimeType">Requested MimeType of the metadata</param>
         /// <returns> JSON Object with the metadata if OK, otherwise status code 400 or 401 or 404</returns>
         [HttpGet("[controller]/{resourceId}/")]
-        public async Task<IActionResult> GetMetadataWithParameter(string resourceId, [FromQuery] string path = "")
+        public async Task<IActionResult> GetMetadataWithParameter(string resourceId, [FromQuery] string path = "", [FromQuery] string mimeType = "application/rdf+json")
         {
             // Strip the first slash, to reuse the previous implementation.
             if (path.StartsWith("/"))
@@ -111,7 +111,7 @@ namespace Coscine.Api.Tree.Controllers
                 path = path[1..];
             }
 
-            return await GetMetadata(resourceId, path);
+            return await GetMetadata(resourceId, path, mimeType);
         }
 
         /// <summary>
@@ -119,8 +119,9 @@ namespace Coscine.Api.Tree.Controllers
         /// </summary>
         /// <param name="resourceId"> Id of a resource</param>
         /// <param name="path">Path to the file</param>
+        /// <param name="mimeType">Requested MimeType of the metadata</param>
         /// <returns> JSON Object with the metadata if OK, otherwise status code 400 or 401 or 404</returns>
-        public async Task<IActionResult> GetMetadata(string resourceId, string path = "")
+        public async Task<IActionResult> GetMetadata(string resourceId, string path = "", string mimeType = "application/rdf+json")
         {
             if (path.Contains("%2F") || path.Contains("%2f"))
             {
@@ -156,7 +157,7 @@ namespace Coscine.Api.Tree.Controllers
                 var resourceTypeInformation = resourceTypeDefinition.GetResourceTypeInformation().Result;
                 var metadataInfos = new List<ResourceEntry>(fileInfos);
 
-                var graphs = new List<JToken>();
+                var graphs = new List<object>();
                 int metadataCount = 0;
                 foreach (var info in metadataInfos)
                 {
@@ -165,7 +166,20 @@ namespace Coscine.Api.Tree.Controllers
                     {
                         var graph = _rdfStoreConnector.GetGraph(id);
                         metadataCount = graph.Triples.Count;
-                        graphs.Add(JToken.Parse(StringWriter.Write(graph, new RdfJsonWriter())));
+                        var writer = MimeTypesHelper.GetWriter(new List<string>() { mimeType });
+                        var parsedRdf = VDS.RDF.Writing.StringWriter.Write(graph, writer);
+                        // Legacy Support
+                        if (mimeType == "application/rdf+json")
+                        {
+                            graphs.Add(JToken.Parse(parsedRdf));
+                        }
+                        else
+                        {
+                            graphs.Add(new JObject
+                            {
+                                [id.AbsoluteUri] = parsedRdf
+                            });
+                        }
                     }
                 }
 
@@ -278,9 +292,10 @@ namespace Coscine.Api.Tree.Controllers
         /// </summary>
         /// <param name="resourceId">Id of the resource</param>
         /// <param name="path">Path to the file</param>
+        /// <param name="mimeType">Requested MimeType of the metadata</param>
         /// <returns>If OK status code 204, otherwise status code 400 or 401</returns>
         [HttpPut("[controller]/{resourceId}/")]
-        public IActionResult StoreMetadataForFileWithParameter(string resourceId, [FromQuery] string path = "")
+        public IActionResult StoreMetadataForFileWithParameter(string resourceId, [FromQuery] string path = "", [FromQuery] string mimeType = "application/rdf+json")
         {
             // Strip the first slash, to reuse the previous implementation.
             if (path.StartsWith("/"))
@@ -288,7 +303,7 @@ namespace Coscine.Api.Tree.Controllers
                 path = path[1..];
             }
 
-            return StoreMetadataForFile(resourceId, path);
+            return StoreMetadataForFile(resourceId, path, mimeType);
         }
 
         /// <summary>
@@ -296,8 +311,9 @@ namespace Coscine.Api.Tree.Controllers
         /// </summary>
         /// <param name="resourceId">Id of the resource</param>
         /// <param name="path">Path to the file</param>
+        /// <param name="mimeType">Requested MimeType of the metadata</param>
         /// <returns>If OK status code 204, otherwise status code 400 or 401</returns>
-        public IActionResult StoreMetadataForFile(string resourceId, string path)
+        public IActionResult StoreMetadataForFile(string resourceId, string path, string mimeType = "application/rdf+json")
         {
             path = $"/{path}";
             if (path.Contains("%2F") || path.Contains("%2f"))
@@ -305,13 +321,34 @@ namespace Coscine.Api.Tree.Controllers
                 return BadRequest("Path can not contain the sequence %2F.");
             }
 
-            var innerBlock = ObjectFactory<JToken>.DeserializeFromStream(Request.Body);
+            // Ducktape solution for supporting multiple mimetypes
+            var metadataObject = ObjectFactory<JToken>.DeserializeFromStream(Request.Body);
+
             var graphNameUri = GenerateId(resourceId, path);
 
-            var json = new JObject
+            JObject json;
+
+            // Legacy Support
+            if (mimeType == "application/rdf+json")
+            {
+                json = new JObject
                 {
-                [graphNameUri.AbsoluteUri] = innerBlock
+                    [graphNameUri.AbsoluteUri] = metadataObject
                 };
+            } 
+            else
+            {
+                var tempGraph = new Graph();
+                StringParser.Parse(tempGraph, metadataObject.Value<string>("metadata").ToString(), MimeTypesHelper.GetParser(mimeType));
+                var triplesList = tempGraph.Triples.ToArray();
+                var subjectNode = tempGraph.CreateUriNode(graphNameUri);
+                foreach (var triple in triplesList)
+                {
+                    tempGraph.Retract(triple);
+                    tempGraph.Assert(new Triple(subjectNode, triple.Predicate, triple.Object));
+                }
+                json = JObject.Parse(VDS.RDF.Writing.StringWriter.Write(tempGraph, MimeTypesHelper.GetWriter("application/rdf+json")));
+            }
 
             var user = _authenticator.GetUser();
             var resource = _resourceModel.GetById(Guid.Parse(resourceId));