starting work on hub mode and spoke mode -- implemented hub model

capsulflask/hub_api.py

@@ -0,0 +1,22 @@
+
+from flask import Blueprint
+from flask import current_app
+from flask import request
+from werkzeug.exceptions import abort
+
+from capsulflask.db import get_model, my_exec_info_message
+
+bp = Blueprint("hosts", __name__, url_prefix="/hosts")
+
+def authorized_for_host(id):
+  auth_header_value = request.headers.get('Authorization').replace("Bearer ", "")
+  return get_model().authorized_for_host(id, auth_header_value)
+
+@bp.route("/heartbeat/<string:id>", methods=("POST"))
+def heartbeat(id):
+  if authorized_for_host(id):
+    get_model().host_heartbeat(id)
+  else:
+    current_app.logger.info(f"/hosts/heartbeat/{id} returned 401: invalid token")
+    return abort(401, "invalid host id or token")
+