Initial AP objects implementation

source/ap/activity_stream.d

@@ -0,0 +1,50 @@
+module ap.activity_stream;
+
+import std.json;
+
+import util;
+
+/++ 
+ * Basic ActivityStream Object
+ * https://www.w3.org/TR/activitypub/#obj
+ +/
+class ASObject {
+  string context; /// Must be activitystream context
+  string id; /// AP requirement for unique identifier
+  string type; /// AP requirement for type of object
+
+  JSONValue raw;
+
+  /++ 
+   + Constructs the object according to json source
+   + Params:
+   +   json = the source json
+   + Returns: Object
+   +/
+  this(JSONValue json) {
+    with (this) {
+      const(JSONValue)* ascontext = "@context" in json;
+
+      if (ascontext == null)
+        throw new Exception("No context in ActivityStream Object");
+
+      switch ((*ascontext).type) {
+      case JSONType.ARRAY:
+        context = (*ascontext)[0].str;
+        break;
+
+      case JSONType.STRING:
+        context = (*ascontext).str;
+        break;
+
+      default:
+        throw new Exception("Invalid @context type for ActivityStream Object");
+      }
+
+      id = json.requiredKey!"id".str;
+      type = json.requiredKey!"type".str;
+
+      raw = json;
+    }
+  }
+}