Add Metadata Statistic API: Request by xpath #986

Console/BExIS.Web.Shell/Areas/DIM/Controllers/API/MetadataStatisticOutController.cs

@@ -0,0 +1,73 @@
+using BExIS.App.Bootstrap.Attributes;
+using BExIS.Modules.Dim.UI.Models.Api;
+using BExIS.Utils.Route;
+using Newtonsoft.Json;
+using System;
+using System.Net;
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Text;
+using System.Web.Http;
+using Vaiona.Persistence.Api;
+
+namespace BExIS.Modules.Dim.UI.Controllers
+{
+
+    public class MetadataStatisticOutController : ApiController
+    {
+
+        // GET: "api/MetadataStatistic"
+        /// <summary>
+        /// Get a list of unique metadata values, count and list of occurrence
+        /// </summary>
+        /// <returns>JSON object</returns>
+        [BExISApiAuthorize]
+        [PostRoute("api/MetadataStatistic")]
+        public HttpResponseMessage Post([FromBody] PostApiMetadataStatisticModel data)
+        { 
+
+            // #TODO add security
+            // string token = this.Request.Headers.Authorization?.Parameter;
+
+            var result = UniqueValuesByXPATH(data.xpath);
+
+            // JSON is returned, but not correctly detected within the repsonse function.
+            // Workaround: Deserialized and Serialize from and to JSON before
+            var resultObject = JsonConvert.DeserializeObject(result.ToString());
+            string resp = JsonConvert.SerializeObject(resultObject);
+
+            var response = Request.CreateResponse(HttpStatusCode.OK);
+            response.Content = new StringContent(resp, System.Text.Encoding.UTF8, "application/json");
+            response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/json");
+
+            return response;           
+        }
+
+        private object UniqueValuesByXPATH(string xpath)
+        {
+            StringBuilder mvBuilder = new StringBuilder();
+            string whereNotIn = "";
+            /*   if (notIn.Count > 0)
+               {
+                   whereNotIn = "and datasetref no in(" + string.Join(",", notIn) + ") ";
+               }
+            */
+
+            // example xpath: " /Metadata/contacts/contactsType/contactPerson/contactType/institute/instituteType/"
+            mvBuilder.AppendLine(string.Format("with result as (select(xpath(\'{0}/text()\', metadata))[1]::text as xpath,json_build_object(\'data\', json_agg(to_jsonb(row(b.datasetref, b.title))), \'count\', count(id)) as json from datasetversions as b where status = 2 {1} group by xpath order by xpath asc) select json_object_agg(coalesce(xpath, \'null\'), result.json) from result; ", xpath, whereNotIn));
+            // execute the statement
+            try
+            {
+                using (IUnitOfWork uow = this.GetBulkUnitOfWork())
+                {
+                    var result = uow.ExecuteScalar(mvBuilder.ToString());
+                    return result;
+                }
+            }
+            catch (Exception e)
+            {
+                return -1;
+            }
+        }
+    }
+}

Console/BExIS.Web.Shell/Areas/DIM/Models/API/ApiModels.cs

@@ -87,4 +87,8 @@ public class ApiDataStatisticModel
         public DataTable missingValues { get; set; }
 
     }
+    public class PostApiMetadataStatisticModel
+    {
+        public string xpath { get; set; }
+    }
 }