deployment handler initial seed code

Change-Id: I0bfc86d17edead0114ea0012fb469014e978cd15
Issue-Id: DCAEGEN2-43
Signed-off-by: J. F. Lucas <jflucas@research.att.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/middleware.js b/lib/middleware.js
new file mode 100644
index 0000000..183cf77
--- /dev/null
+++ b/lib/middleware.js
@@ -0,0 +1,77 @@
+/*
+Copyright(c) 2017 AT&T Intellectual Property. All rights reserved. 
+
+Licensed under the Apache License, Version 2.0 (the "License"); 
+you may not use this file except in compliance with the License.
+
+You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, 
+software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+CONDITIONS OF ANY KIND, either express or implied. 
+See the License for the specific language governing permissions and limitations under the License.
+*/
+
+/* Middleware modules  */
+
+"use strict";
+
+const utils = require('./utils');
+const log = require('./logging').getLogger();
+
+/* Assign a request ID and start time to each incoming request */
+exports.assignId = function(req, res, next) {
+	/* Use request ID from header if available, otherwise generate one */
+	req.startTime = new Date();
+	req.dcaeReqId = req.get('X-ECOMP-RequestID') ||  utils.generateId();
+	next();
+};
+
+
+/* Error handler -- send error with JSON body */
+exports.handleErrors = function(err, req, res, next) {
+	var status = err.status || 500;
+	var msg = err.message || err.body || 'unknown error'
+	res.status(status).type('application/json').send({status: status, message: msg });
+	log.audit(req, status, msg);
+
+	if (status >= 500) {
+		log.error(err, req);
+	}
+};
+
+/* Make sure Content-Type is correct for POST and PUT */
+exports.checkType = function(type){
+	return function(req, res, next) {
+		const ctype = req.header('content-type');
+		const method = req.method.toLowerCase();
+		/* Content-Type matters only for POST and PUT */
+		if (ctype === type || ['post','put'].indexOf(method) < 0) {
+			next();
+		}
+		else {
+			var err = new Error ('Content-Type must be \'' + type +'\'');
+			err.status = 415;
+			next (err);
+		}	
+	};
+};
+
+/* Check that a JSON body has a set of properties */
+exports.checkProps = function(props) {
+	return function (req, res, next) {
+		const missing = props.filter(function(p){return !utils.hasProperty(req.body,p);});
+		if (missing.length > 0) {
+			var err = new Error ('Request missing required properties: ' + missing.join(','));
+			err.status = 400;
+			next(err);
+		}
+		else {
+			next();
+		}	
+	};
+};
+
+