rest-api.php

   1 <?php
   2
   3 // Response 'Content-Type' header
   4 header('Content-Type: application/json');
   5
   6 // @see https://stackoverflow.com/a/61856861
   7 header('Access-Control-Allow-Origin: *');
   8 header('Access-Control-Allow-Methods: GET, POST, PATCH, PUT, DELETE, OPTIONS');
   9 header('Access-Control-Allow-Headers: Content-Type, Accept, Origin, Access-Control-Allow-Headers');
  10
  11 if ('OPTIONS' === $_SERVER['REQUEST_METHOD']) {
  12     return;
  13 }
  14
  15 // Flag that tells if the 'Accept' header in the request is invalid
  16 $invalidAccept = '*/*' != $_SERVER['HTTP_ACCEPT'] && 'application/json' != $_SERVER['HTTP_ACCEPT'];
  17
  18 // Do not accept requests which 'Accept' header isn't one of the above
  19 if ($invalidAccept) {
  20     header('HTTP/1.1 406 Not Acceptable');
  21     exit;
  22 }
  23
  24 // Get request method and path
  25 $method = strtolower($_SERVER['REQUEST_METHOD']);
  26 $uri = parse_url($_SERVER['REQUEST_URI']);
  27 $path = trim(trim($uri['path']), '/');
  28
  29 // Default 'resource' and 'id' values
  30 $resource = 'root';
  31 $id = null;
  32
  33 // Get 'resource' and 'id' values
  34 if ($path) {
  35     $path = explode('/', $path);
  36     $resource = $path[0];
  37     if (!empty($path[1])) {
  38         $id = (int) $path[1];
  39     }
  40 }
  41
  42 // Default 'input' value
  43 $input = null;
  44
  45 // Get 'input' value
  46 if ('post' == $method || 'put' == $method) {
  47     $input = file_get_contents('php://input');
  48 }
  49
  50 // File name (convention) from where the logic will be loaded
  51 $fileName = strtolower("{$method}_{$resource}");
  52 $fileName .= $id ? '_id' : '';
  53 $fileName .= '.php';
  54
  55 // The logic must be under the `code` directory
  56 $fileName = "code/{$fileName}";
  57
  58 // Function name (convention) that handles the request
  59 //
  60 // The function will receive the following parameters:
  61 //
  62 // * Parameter 1: int|null    $id    The item ID (if it's present)
  63 // * Parameter 2: string|null $input The input value (if it's present)
  64 $functionName = 'handle_request';
  65
  66 // Load and call the logic that handles the request
  67 if (is_readable($fileName)) {
  68     require_once $fileName;
  69     if (function_exists($functionName)) {
  70         $functionName($id, $input);
  71         exit;
  72     }
  73 }
  74
  75 // Default (404) response code
  76 header('HTTP/1.1 404 Not Found');