Utils.php

Utils.php

<?php
require '../vendor/autoload.php';
require_once 'Config.php';

if(PHP_DEBUG_MODE){
  error_reporting(-1);
  ini_set('display_errors', 'On');
}

// authorized user id from db - global var
$user_id = NULL;

/**
* Verifying required params posted or not
*/
function verifyRequiredParams($required_fields) {
  $error = false;
  $error_fields = "";
  $request_params = array();
  $request_params = $_REQUEST;
  // handling PUT request params
  if ($_SERVER['REQUEST_METHOD'] == 'PUT') {
    $app = \Slim\Slim::getInstance();
    parse_str($app->request()->getBody(), $request_params);
  }
  foreach ($required_fields as $field) {
    if (!isset($request_params[$field]) || !is_array($request_params)) {
      $error = true;
      $error_fields .= $field . ', ';
    }
  }
  if ($error) {
    // required fields are missing or empty
    // echo error json and stop the app
    $response = array();
    $app = \Slim\Slim::getInstance();
    $response['error'] = true;
    $response["message"] = 'Required field(s) ' . substr($error_fields, 0, -2) . ' is missing or empty';
    echoResponse(400, $response);
    $app->stop();
  }
}

/**
* Valiedating email address
*/
function validateEmail($email){
  $app = \Slim\Slim::getInstance();
  if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
    $response['error'] = true;
    $response['message'] = 'Email is not valid';
    echoResponse(400, $response);
    $app->stop();
  }
}

/**
* Echo json response
* @param String $status_code http response code
* @param Int $response Json response
*/
function echoResponse($status_code, $response) {
  $app = \Slim\Slim::getInstance();
  // Http response code
  $app->status($status_code);
  // setting response content type to json
  $app->contentType('application/json');
  echo json_encode($response);
}

/**
*  Adding Middle Layer to authenticate every request
*  Checking if the request has valid api key in the 'Authorization' header
 */
function authenticate(\Slim\Route $route) {
  // getting request header
  $headers = apache_request_headers();
  $response = array();
  $app = \Slim\Slim::getInstance();

  // verifying authorization header
  if (isset($headers['Authorization'])) {
    $db = new DbHandler();

    // get the api key
    $api_key = $headers['Authorization'];
    // validating api key
    if (!$db->isValidApikey($api_key)) {
      //api key is not present in users table
      $response['error'] = true;
      $response['message'] = 'Access denied. Invalid api key';
      echoResponse(401, $response);
      $app->stop();
    } else {
      global $user_id;
      // get user primary key id
      $user = $db->getUserId($api_key);
      if ($user != NULL) {
        $user_id = $user['id'];
      }
    }
  } else {
    // api key is missing in header
    $response['error'] = true;
    $response['message'] = "Api key is missing";
    echoResponse(400, $response);
    $app->stop();
  }
}

/** Debugging utility */
function p($input, $exit=1) {
  echo '<pre>';
  print_r($input);
  echo '</pre>';
  if($exit) {
    exit;
  }
}

function j($input, $encode=true, $exit=1) {
  echo '<pre>';
  echo json_encode($input, JSON_PRETTY_PRINT | $encode);
  echo '</pre>';
  if($exit) {
    exit;
  }
}

?>