// You can create any number of scripting services and invoke them from the REST API.

// In this example, we'll create a simple service named 'math' that accepts two numbers

// as query parameters and returns the result as JSON.

// Since the script is a service, you can control access to it using roles.

// The script has whatever access to the API that is allowed by the role of the user calling the script.

// If allowed, the script can make additional REST API calls or cURL requests.

$verb = $event['request']['method'];

if($verb !== 'GET'){

throw new \DreamFactory\Core\Exceptions\BadRequestException('Only HTTP GET is allowed on this endpoint.');

}

// get resource, /math —> "", /math/add —> "add"

$resource = $event['resource'];

// get query params from request

$params = $event['request']['parameters'];

$required = ['n1', 'n2'];

if(!empty($resource)){

foreach($required as $element){

if(!isset($params[$element])){

throw new \DreamFactory\Core\Exceptions\BadRequestException('Missing '.$element.' in params.');

}

}

$n1 = $params['n1'];

$n2 = $params['n2'];

}

switch ($resource) {

case "":

// /math means return all supported resources

$result = ['resource' => ['add', 'subtract', 'multiply', 'divide']];

break;

case "add":

$result = ['result' => ($n1 + $n2)];

break;

case "subtract":

$result = ['result' => ($n1 - $n2)];

break;

case "multiply":

$result = ['result' => ($n1 * $n2)];

break;

case "divide":

if (!$n2) {

throw new \DreamFactory\Core\Exceptions\BadRequestException('Divide by zero error.');

}

$result = ['result' => ($n1 / $n2)];

break;

default:

throw new \DreamFactory\Core\Exceptions\BadRequestException('Invalid or missing resource name.');

break;

}

return $result;