drachtio-http-authenticator

drachtio middleware that delegates sip authentication to an http api. This allows, for instance, a multi-tenant sip application server to delegate authentication to a customer api.

The middleware-returning function can be invoked EITHER with an HTTP URL to call OR a function yielding a Promise that resolves to an HTTP URL. Alternatively, instead of a returning a URL, and object can be provided with url, username, and password properties if you wish to protect your endpoint with HTTP Basic Authentication.

An HTTP POST will be made to the specified URL with a JSON body containing the sip method and the components from the Authorization header. The HTTP server should return a status code of 200 in all cases, containing a JSON body with instructions on whether to admit the request.

To admit the request, send a 200 response with a status of ok, e.g.

{"status": "ok"}

To deny the request, send a 200 response with a status of fail. The status field MUST be provided. Optionally, a response MAY include a msg attribute, an expires attribute, and/or a blacklist attribute.

• The msg property is simply a human-readable description of why an authentication failed.
• The expires value provides a value in seconds for the duration of a granted registration. This value, if provided, must be less than the requested expiration. If not provided, the requested expires value is granted.
• The blacklist property shall contain a number indicating a period of time, in seconds, that the source IP address should be blocked. A value of -1 means forever.

{"status": "fail"}

or

{"status": "fail", "msg": "unknown user"}

{"status": "fail", "blaclist": 3600}

Additionally, for admitted requests, the middleware adds a req.authorization object which contains two properties:

• challengeResponse - an object containing the parsed elements of the sip Authorization header, and
• grant - an object containing the json response received in the 200 OK to the POST request.

const authenticator = require('drachtio-http-authenticator')({
  url: 'https://example.com/auth',
  auth: {
    username: 'foo',
    password: 'bar'
  }
});

srf.use('invite', authenticator);