From f8275974b148370178424584965bb97742fecd9f Mon Sep 17 00:00:00 2001
From: Harald Wolff <haraldwolff@skyoffice>
Date: Wed, 19 Jun 2019 12:31:28 +0200
Subject: [PATCH] WIP

---
 collections/EntityMapper.cs              |  4 +-
 collections/JSONCollectionResource<T>.cs | 49 +++++++++++++++++++++++-
 doc/JSONCollection.txt                   |  7 ++++
 3 files changed, 56 insertions(+), 4 deletions(-)

diff --git a/collections/EntityMapper.cs b/collections/EntityMapper.cs
index 4b02d86..c52d3cb 100644
--- a/collections/EntityMapper.cs
+++ b/collections/EntityMapper.cs
@@ -9,8 +9,8 @@ namespace ln.http.resources.collections
     {
         public JSONConvert JSONConvert { get; set; }
 
-        Dictionary<string, FieldInfo> publicFields = new Dictionary<string, FieldInfo>();
-        Dictionary<string, PropertyInfo> publicProperties = new Dictionary<string, PropertyInfo>();
+        public Dictionary<string, FieldInfo> publicFields = new Dictionary<string, FieldInfo>();
+        public Dictionary<string, PropertyInfo> publicProperties = new Dictionary<string, PropertyInfo>();
 
         public EntityMapper()
         {
diff --git a/collections/JSONCollectionResource<T>.cs b/collections/JSONCollectionResource<T>.cs
index fa6456d..cfa5891 100644
--- a/collections/JSONCollectionResource<T>.cs
+++ b/collections/JSONCollectionResource<T>.cs
@@ -19,6 +19,7 @@ using System.ComponentModel;
 using ln.types.odb.mapped;
 using ln.types.threads;
 using ln.types.json;
+using System.Reflection;
 
 namespace ln.http.resources.collections
 {
@@ -61,7 +62,11 @@ namespace ln.http.resources.collections
                         object documentID = collection.Mapper.GetDocumentID(ni);
                         httpResponse.SetHeader("Location", String.Format("/{0}/{1}", String.Join("/", this.Path), documentID.ToString()));
                         httpResponse.StatusCode = 201;
-                        responseValue = ni;*/
+                        responseValue = ni;
+*/
+                        break;
+                    case "DESC":
+                        collectionResult = Describe(httpRequest);
                         break;
                     default:
                         throw new NotSupportedException();
@@ -90,6 +95,40 @@ namespace ln.http.resources.collections
             return httpResponse;
         }
 
+        private CollectionResult Describe(HttpRequest request)
+        {
+            CollectionResult collectionResult = new CollectionResult();
+            collectionResult.Descriptor = new JObject();
+
+            JArray jProperties = new JArray();
+
+            foreach (FieldInfo fieldInfo in EntityMapper.publicFields.Values)
+            {
+                String skyType = JSONConvert.GetSkyType(fieldInfo.FieldType);
+                if (skyType != null)
+                {
+                    JObject field = new JObject();
+                    field.Add("name", JToken.FromObject(fieldInfo.Name));
+                    field.Add("type", JToken.FromObject(skyType));
+                    jProperties.Add(field);
+                }
+            }
+            foreach (PropertyInfo propertyInfo in EntityMapper.publicProperties.Values)
+            {
+                String skyType = JSONConvert.GetSkyType(propertyInfo.PropertyType);
+                if (skyType != null)
+                {
+                    JObject field = new JObject();
+                    field.Add("name", JToken.FromObject(propertyInfo.Name));
+                    field.Add("type", JToken.FromObject(skyType));
+                    jProperties.Add(field);
+                }
+            }
+
+            collectionResult.Descriptor.Add("properties", jProperties);
+            return collectionResult;
+        }
+
         private CollectionResult Query(HttpRequest request)
         {
             CollectionResult collectionResult = new CollectionResult();
@@ -120,13 +159,17 @@ namespace ln.http.resources.collections
             surround.Add("values", jvalues);
 
             JObject jfailed = new JObject();
-
             foreach (TIDENT id in collectionResult.Failed.Keys)
             {
                     jfailed.Add(id.ToString(), collectionResult.Failed[id]);
             }
             surround.Add("failed", jfailed);
 
+            if (collectionResult.Descriptor != null)
+            {
+                surround.Add("desc", collectionResult.Descriptor);
+            }
+
             response.SetHeader("content-type", "application/json");
             response.ContentWriter.Write(surround.ToString());
 
@@ -137,6 +180,8 @@ namespace ln.http.resources.collections
         {
             public List<TENTITY> Values { get; } = new List<TENTITY>();
             public Dictionary<TIDENT, String> Failed { get; } = new Dictionary<TIDENT, string>();
+
+            public JObject Descriptor { get; set; }
         }
 
     }
diff --git a/doc/JSONCollection.txt b/doc/JSONCollection.txt
index d920e01..77654db 100644
--- a/doc/JSONCollection.txt
+++ b/doc/JSONCollection.txt
@@ -1,5 +1,6 @@
 # Unterstützte Methoden:
 
+DESC    /collection                         Abruf der Objektbeschreibung für diese Collection
 GET     /collection                         Abruf von Elementen aus der Kollektion, optional mit Filter
 GET     /collection/<element identifier>    Abruf eines definierten Element der Kollektion
 POST    /collection                         Hinzufügen neuer Elemente zur Kollektion
@@ -18,6 +19,12 @@ DELETE  /collection/<element identifier>    Entfernen eines Elements der Kollekt
         <IDENTIFIER0>: <ELEMENTURL0>,       // Element <IDENTIFIER0> wurde erfolgreich hinzugefügt / geändert
         <IDENTIFIER1>: null,                // Element <IDENTIFIER1> wurde erfolgreich gelöscht
     },
+    desc: {
+        properties: [
+            {   name: <PROP0NAME>, type: <PROPTYPE>, readonly: true/false, },
+            ...
+        ],
+    },
 }
 
 # Anfrageschemata