Return what is supported by a compute node

Ref https://github.com/GNS3/gns3-gui/issues/1448

gns3server/handlers/api/compute/__init__.py

@@ -18,6 +18,7 @@
 import sys
 import os
 
+from .capabilities_handler import CapabilitiesHandler
 from .network_handler import NetworkHandler
 from .project_handler import ProjectHandler
 from .dynamips_vm_handler import DynamipsVMHandler

gns3server/handlers/api/compute/capabilities_handler.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+#
+# Copyright (C) 2015 GNS3 Technologies Inc.
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+from gns3server.web.route import Route
+from gns3server.config import Config
+from gns3server.schemas.capabilities import CAPABILITIES_SCHEMA
+from gns3server.version import __version__
+from gns3server.compute import MODULES
+from aiohttp.web import HTTPConflict
+
+
+class CapabilitiesHandler:
+    @Route.get(
+        r"/capabilities",
+        description="Retrieve the capabilities of the server",
+        output=CAPABILITIES_SCHEMA)
+    def get(request, response):
+
+        node_types = []
+        for module in MODULES:
+            node_types.extend(module.node_types())
+
+        response.json({
+            "version": __version__,
+            "node_types": node_types
+        })