this.authorize = function()

in provider/lib/utils.js [408:443]
32 lines of code
8 McCabe index (conditional complexity)

    this.authorize = function(req, res, next) {
        var method = 'authorize';

        if (self.endpointAuth) {
            if (!req.headers.authorization) {
                res.set('www-authenticate', 'Basic realm="Private"');
                res.status(HttpStatus.UNAUTHORIZED);
                return res.send('');
            }

            var parts = req.headers.authorization.split(' ');
            if (parts[0].toLowerCase() !== 'basic' || !parts[1]) {
                return sendError(method, HttpStatus.BAD_REQUEST, 'Malformed request, basic authentication expected', res);
            }

            var auth = new Buffer(parts[1], 'base64').toString();
            auth = auth.match(/^([^:]*):(.*)$/);
            if (!auth) {
                return sendError(method, HttpStatus.BAD_REQUEST, 'Malformed request, authentication invalid', res);
            }

            var uuid = auth[1];
            var key = auth[2];
            var endpointAuth = self.endpointAuth.split(':');
            if (endpointAuth[0] === uuid && endpointAuth[1] === key) {
                next();
            }
            else {
                logger.warn(method, 'Invalid key');
                return sendError(method, HttpStatus.UNAUTHORIZED, 'Invalid key', res);
            }
        }
        else {
            next();
        }
    };