FetchData: Validate params

logic/Actions/FetchData.php

@@ -5,14 +5,18 @@ namespace AirQuality\Actions;
 
 class FetchData {
 	private $settings;
-	private $renderer;
+	private $validator;
 	
 	public function __construct(
 		\SBRL\TomlConfig $in_settings) {
 		$this->settings = $in_settings;
+		$this->validator = new \AirQuality\Validator($_GET);
 	}
 	
 	public function handle() {
-		echo("Testing");
+		$this->validator->is_datetime("datetime");
+		$this->validator->run();
+		
+		echo("Params valid!");
 	}
 }

logic/Validator.php

@@ -1,8 +1,6 @@
 <?php
 namespace AirQuality;
 
-
-
 class Validator {
 	private $target_data;
 	private $tests = [];
@@ -80,6 +78,17 @@ class Validator {
 		);
 	}
 	
+	public function is_datetime($key) {
+		$this->add_test(
+			$key,
+			function($data) {
+				return strtotime($data) !== false;
+			},
+			400,
+			"The datetime provided in the '$key' parameter is invalid."
+		);
+	}
+	
 	public function add_test($key, $test, $response_code, $message) {
 		$new_test = [
 			"key" => $key,