REST Server front-end interface for EWD.js Systems: ewdrest

This module provides a REST interface to one or more EWD.js systems.

It rewrites incoming REST URLs and rewrites them as signed EWD.js HTTP URLs and routes them to an EWD.js server where a back-end module provides the web service logic.

Rob Tweed rtweed@mgateway.com
13 February 2014, M/Gateway Developments Ltd http://www.mgateway.com

Twitter: @rtweed

Google Group for discussions, support, advice etc: http://groups.google.co.uk/group/enterprise-web-developer-community

Installing the REST interface for EWD.js

   npm install ewdrest

Using the EWD REST Server interface

Define a configuration object that specifies:

• the port on which the REST Server listens;
• the mapping between REST URL and the EWD.js server(s)
• the mapping between REST URL and the back-end EWD.js module(s)

Then start the REST server using this configuration object

eg:

   var ewdrest = require('ewdrest');

   var params = {
     // REST server listener port
     restPort: 8081,
     // service module mapping
     service: {
       myService: {
         module: 'myModule',
         service: 'parse',
         contentType: 'application/json'
       }
     },
     // EWD.js server mapping
     server: {
       somewhere: {
         host: 'www.somewhere.com',
         port: 8080,
         ssl: true,
         secretKey: 'TakeARest!',
         accessId: 'RESTServer'
       }
     }
   };

   ewdrest.start(params);

This example will forward all GET, POST, DELETE and PUT REST request URLs of the form:

   http://localhost:8081/somewhere/myService/etc.....

to the EWD.js server at www.somewhere.com:8080, where a service named parse in an EWD.js module named myModule will be invoked to handle the request.

ie:

  /somewhere defines the EWD.js server route
  /myService is a proxy to the back-end EWD.js module name

Parsing the rest of the URL and determining which HTTP Verb(s) are valid is the responsibility of the EWD.js back-end module.

A valid back-end response should return a JSON response whose content is up to you.
An error response is of the form:

   {error: 'Your specific error message'}  

Note: the accessId and secretKey must be registered on the EWD.js server, along with any back-end modules that requests signed by the accessId are allowed to invoke. See the chapter on Web Service Interface in the EWD.js User Guide.

License

Copyright (c) 2014 M/Gateway Developments Ltd,
Reigate, Surrey UK.
All rights reserved.

http://www.mgateway.com
Email: rtweed@mgateway.com

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.