feat: Added enumeration of HTTP response status codes (#303)

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Jonah Lawrence <jonah@freshidea.com>

CONTRIBUTING.md

@@ -8,7 +8,7 @@ Make sure your request is meaningful and you have tested the app locally before
 
 #### Requirements
 
-- [PHP 7.4+](https://www.apachefriends.org/index.html)
+- [PHP 8.1+](https://www.apachefriends.org/index.html)
 - [Composer](https://getcomposer.org)
 
 #### Linux

composer.json

@@ -16,18 +16,21 @@
     "classmap": [
       "src/models/",
       "src/views/",
-      "src/controllers/"
+      "src/controllers/",
+      "src/enums/",
+      "src/exceptions/",
+      "src/interfaces/"
     ]
   },
   "require": {
-    "php": "^7.4|^8.0",
+    "php": "^8.1",
     "vlucas/phpdotenv": "^5.3"
   },
   "require-dev": {
     "phpunit/phpunit": "^11"
   },
   "scripts": {
-    "start": "php7 -S localhost:8000 -t src || php -S localhost:8000 -t src",
+    "start": "php8 -S localhost:8000 -t src || php -S localhost:8000 -t src",
     "test": "./vendor/bin/phpunit --testdox tests",
     "format:check": "prettier --check *.md **/**/*.{php,md,js,css} --print-width 120",
     "format": "prettier --write *.md **/**/*.{php,md,js,css} --print-width 120"

src/controllers/RendererController.php

@@ -20,12 +20,17 @@ class RendererController
      */
     private $params;
 
+    /**
+     * @var ResponseEnum $statusCode Response status code
+     */
+    private ResponseEnum $statusCode = ResponseEnum::HTTP_OK;
+
     /**
      * Construct RendererController
      *
      * @param array<string, string> $params request parameters
      */
-    public function __construct($params)
+    public function __construct(array $params)
     {
         $this->params = $params;
 
@@ -40,6 +45,10 @@ public function __construct($params)
             $this->model = new ErrorModel(__DIR__ . "/../templates/error.php", $error->getMessage());
             // create error rendering view
             $this->view = new ErrorView($this->model);
+
+            // set status code
+            $this->statusCode =
+                $error instanceof IStatusException ? $error->getStatus() : ResponseEnum::HTTP_INTERNAL_SERVER_ERROR;
         }
     }
 
@@ -89,6 +98,9 @@ public function setHeaders(): void
 
         // set cache headers
         $this->setCacheRefreshDaily();
+
+        // set status code
+        http_response_code($this->statusCode->value);
     }
 
     /**

src/enums/ResponseEnum.php

@@ -0,0 +1,90 @@
+<?php
+
+/**
+ * Enumeration of HTTP response status codes.
+ *
+ * This enum represents the standard HTTP response status codes
+ * defined by the Internet Assigned Numbers Authority (IANA) in
+ * the Hypertext Transfer Protocol (HTTP) status code registry.
+ * Each status code is associated with an integer value and a
+ * descriptive name.
+ *
+ * Usage example:
+ * if (ResponseEnum::HTTP_OK->value === 200) {
+ *     echo "Request was successful.";
+ * }
+ */
+enum ResponseEnum: int
+{
+    // 1xx: Informational
+    case HTTP_CONTINUE = 100;
+    case HTTP_SWITCHING_PROTOCOLS = 101;
+    case HTTP_PROCESSING = 102;
+
+    // 2xx: Success
+    case HTTP_OK = 200;
+    case HTTP_CREATED = 201;
+    case HTTP_ACCEPTED = 202;
+    case HTTP_NON_AUTHORITATIVE_INFORMATION = 203;
+    case HTTP_NO_CONTENT = 204;
+    case HTTP_RESET_CONTENT = 205;
+    case HTTP_PARTIAL_CONTENT = 206;
+    case HTTP_MULTI_STATUS = 207;
+    case HTTP_ALREADY_REPORTED = 208;
+    case HTTP_IM_USED = 226;
+
+    // 3xx: Redirection
+    case HTTP_MULTIPLE_CHOICES = 300;
+    case HTTP_MOVED_PERMANENTLY = 301;
+    case HTTP_FOUND = 302;
+    case HTTP_SEE_OTHER = 303;
+    case HTTP_NOT_MODIFIED = 304;
+    case HTTP_USE_PROXY = 305;
+    case HTTP_SWITCH_PROXY = 306; // No longer used
+    case HTTP_TEMPORARY_REDIRECT = 307;
+    case HTTP_PERMANENT_REDIRECT = 308;
+
+    // 4xx: Client Error
+    case HTTP_BAD_REQUEST = 400;
+    case HTTP_UNAUTHORIZED = 401;
+    case HTTP_PAYMENT_REQUIRED = 402;
+    case HTTP_FORBIDDEN = 403;
+    case HTTP_NOT_FOUND = 404;
+    case HTTP_METHOD_NOT_ALLOWED = 405;
+    case HTTP_NOT_ACCEPTABLE = 406;
+    case HTTP_PROXY_AUTHENTICATION_REQUIRED = 407;
+    case HTTP_REQUEST_TIMEOUT = 408;
+    case HTTP_CONFLICT = 409;
+    case HTTP_GONE = 410;
+    case HTTP_LENGTH_REQUIRED = 411;
+    case HTTP_PRECONDITION_FAILED = 412;
+    case HTTP_PAYLOAD_TOO_LARGE = 413;
+    case HTTP_URI_TOO_LONG = 414;
+    case HTTP_UNSUPPORTED_MEDIA_TYPE = 415;
+    case HTTP_RANGE_NOT_SATISFIABLE = 416;
+    case HTTP_EXPECTATION_FAILED = 417;
+    case HTTP_IM_A_TEAPOT = 418;
+    case HTTP_MISDIRECTED_REQUEST = 421;
+    case HTTP_UNPROCESSABLE_ENTITY = 422;
+    case HTTP_LOCKED = 423;
+    case HTTP_FAILED_DEPENDENCY = 424;
+    case HTTP_TOO_EARLY = 425;
+    case HTTP_UPGRADE_REQUIRED = 426;
+    case HTTP_PRECONDITION_REQUIRED = 428;
+    case HTTP_TOO_MANY_REQUESTS = 429;
+    case HTTP_REQUEST_HEADER_FIELDS_TOO_LARGE = 431;
+    case HTTP_UNAVAILABLE_FOR_LEGAL_REASONS = 451;
+
+    // 5xx: Server Error
+    case HTTP_INTERNAL_SERVER_ERROR = 500;
+    case HTTP_NOT_IMPLEMENTED = 501;
+    case HTTP_BAD_GATEWAY = 502;
+    case HTTP_SERVICE_UNAVAILABLE = 503;
+    case HTTP_GATEWAY_TIMEOUT = 504;
+    case HTTP_HTTP_VERSION_NOT_SUPPORTED = 505;
+    case HTTP_VARIANT_ALSO_NEGOTIATES = 506;
+    case HTTP_INSUFFICIENT_STORAGE = 507;
+    case HTTP_LOOP_DETECTED = 508;
+    case HTTP_NOT_EXTENDED = 510;
+    case HTTP_NETWORK_AUTHENTICATION_REQUIRED = 511;
+}

src/exceptions/UnprocessableEntityException.php

@@ -0,0 +1,9 @@
+<?php
+
+class UnprocessableEntityException extends InvalidArgumentException implements IStatusException
+{
+    public function getStatus(): ResponseEnum
+    {
+        return ResponseEnum::HTTP_UNPROCESSABLE_ENTITY;
+    }
+}

src/interfaces/IStatusException.php

@@ -0,0 +1,6 @@
+<?php
+
+interface IStatusException
+{
+    public function getStatus(): ResponseEnum;
+}

src/models/ErrorModel.php

@@ -6,18 +6,18 @@
 class ErrorModel
 {
     /** @var string $message Text to display */
-    public $message;
+    public string $message;
 
     /** @var string $template Path to template file */
-    public $template;
+    public string $template;
 
     /**
      * Construct ErrorModel
      *
      * @param string $message Text to display
      * @param string $template Path to the template file
      */
-    public function __construct($template, $message)
+    public function __construct(string $template, string $message)
     {
         $this->message = $message;
         $this->template = $template;

src/models/GoogleFontConverter.php

@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 /**
  * Class for converting Google Fonts to base 64 for displaying through SVG image
  */
@@ -10,9 +12,9 @@ class GoogleFontConverter
      *
      * @param string $font Google Font to fetch
      * @param string $text Text to display in font
-     * @return string|false The CSS for displaying the font
+     * @return string The CSS for displaying the font
      */
-    public static function fetchFontCSS($font, $weight, $text)
+    public static function fetchFontCSS($font, $weight, $text): string
     {
         $url =
             "https://fonts.googleapis.com/css2?" .
@@ -70,7 +72,7 @@ private static function curlGetContents($url): string
         $response = curl_exec($ch);
         $httpCode = curl_getinfo($ch, CURLINFO_HTTP_CODE);
         curl_close($ch);
-        if ($httpCode != 200) {
+        if ($httpCode != ResponseEnum::HTTP_OK->value) {
             throw new InvalidArgumentException("Failed to fetch Google Font from API.");
         }
         return $response;

src/models/RendererModel.php

@@ -122,7 +122,7 @@ public function __construct($template, $params)
     private function checkLines($lines)
     {
         if (!$lines) {
-            throw new InvalidArgumentException("Lines parameter must be set.");
+            throw new UnprocessableEntityException("Lines parameter must be set.");
         }
         if (strlen($this->separator) === 1) {
             $lines = rtrim($lines, $this->separator);
@@ -176,7 +176,7 @@ private function checkNumberPositive($num, $field)
     {
         $digits = intval(preg_replace("/[^0-9\-]/", "", $num));
         if ($digits <= 0) {
-            throw new InvalidArgumentException("$field must be a positive number.");
+            throw new UnprocessableEntityException("$field must be a positive number.");
         }
         return $digits;
     }
@@ -192,7 +192,7 @@ private function checkNumberNonNegative($num, $field)
     {
         $digits = intval(preg_replace("/[^0-9\-]/", "", $num));
         if ($digits < 0) {
-            throw new InvalidArgumentException("$field must be a non-negative number.");
+            throw new UnprocessableEntityException("$field must be a non-negative number.");
         }
         return $digits;
     }