doc: add deprecation note to README (#19)

This plugin has been deprecated as of Reflect version 3.8.5

Reviewed-on: https://codeberg.org/reflect/rules-plugin/pulls/19
Co-authored-by: vlw <victor@vlw.se>
Co-committed-by: vlw <victor@vlw.se>

README.md

@@ -1,13 +1,15 @@
-# Request validation plugin for the [Reflect API Framework](https://github.com/victorwesterlund/reflect)
-This request pre-processor adds request validation to an API written for the Reflect API Framework. Enforce request constraints against set rules and optionally return errors back with a `Reflect\Response` before your endpoint's code even starts running.
+> [!IMPORTANT]
+> This plugin has since [Reflect version 3.8.5](https://codeberg.org/reflect/reflect/releases/tag/2.8.5) been deprecated. Reflect now has built-in request validation which is enabled by default. The built-in validator is based on this plugin.
 
-Write Reflect endpoints safer by assuming data is what you expect it to be before it reaches your endpoint's logic. This plugin will validate GET and POST parameters against user-defined constraints before letting a request through to a `Reflect\Endpoint`.
-A `Reflect\Response` will be generated and handled by this plugin if request data doesn't meet the defiend constraints.
+# Request validation plugin for the [Reflect API Framework](https://codeberg.org/reflect/reflect)
+This request pre-processor adds request validation for an API written in the Reflect API Framework.
 
-*Example:*
+Write safer Reflect endpoints by enforcing request data structure validation before the request reaches your endpoint's logic. This plugin validates GET and POST data (even JSON) and returns an array with scoped `Error`s that can be further acted upon if desired.
+
+## Example
 ```
-Request: /my-endpoint?key1=lorem-ipsum&key2=dolor
-Response: (HTTP 422) {"key2": ["Value must be of type 'STRING']}
+POST Request: /my-endpoint?key1=lorem-ipsum&key2=dolor
+POST Body: {"key3":15, "key4":["hello", "world"]}
 ```
 ```php
 use \Reflect\Endpoint;
@@ -17,7 +19,7 @@ use \ReflectRules\Type;
 use \ReflectRules\Rules;
 use \ReflectRules\Ruleset;
 
-class GET_MyEndpoint implements Endpoint {
+class POST_MyEndpoint implements Endpoint {
   private Ruleset $rules;
 
   public function __construct() {
@@ -30,9 +32,20 @@ class GET_MyEndpoint implements Endpoint {
         ->min(5)
         ->max(50),
       (new Rules("key2")
+        ->required()
         ->type(Type::NUMBER)
         ->max(255)
     ]);
+
+    $this->rules->POST([
+      (new Rules("key3")
+        ->type(Type::ARRAY)
+        ->min(3),
+      (new Rules("key4")
+        ->required()
+        ->type(Type::STRING)
+        ->max(255)
+    ]);
   }
 
   public function main(): Response {
@@ -40,6 +53,28 @@ class GET_MyEndpoint implements Endpoint {
   }
 }
 ```
+```php
+Ruleset->get_errors();
+[
+  "GET" => [
+    "key2" => [
+      "INVALID_PROPERTY_TYPE" => ["STRING"]
+    ]
+  ],
+  "POST" => [
+    "key3" => [
+      "VALUE_MIN_ERROR" => 3
+    ],
+    "key4" => [
+      "MISSING_REQUIRED_PROPERTY" => "key4"
+    ]
+  ]
+]
+```
+
+Use `Ruleset->is_valid(): bool` to quickly check if any errors are set.
+
+You can also use `Ruleset->validate_or_exit(): true|Response` to automatically return a `Reflect\Response` with all errors to current STDOUT if validation fails.
 
 # Installation
 
@@ -70,6 +105,26 @@ public function __construct() {
 }
 ```
 
+# Errors 
+
+Error
+--|
+[`Error::VALUE_MIN_ERROR`](#min)
+[`Error::VALUE_MAX_ERROR`](#max)
+[`Error::UNKNOWN_PROPERTY_NAME`](#strict-mode)
+[`Error::INVALID_PROPERTY_TYPE`](#type)
+[`Error::INVALID_PROPERTY_VALUE`](#typeenum)
+[`Error::MISSING_REQUIRED_PROPERTY`](#required)
+
+# Strict mode
+Enable strict mode by initializing a Ruleset with the "strict" argument set to `true`.
+
+```php
+new Ruleset(strict: true);
+```
+
+Strict mode will not allow undefined properties to be set in all configured scopes. If a property exists in `Scope` that hasn't been defined with a `Rules()` instance, a `Errors::UNKNOWN_PROPERTY_NAME` error will be set.
+
 # Available rules
 The following methods can be chained onto a `Rules` instance to enforce certain constraints on a particular property
 
@@ -78,7 +133,9 @@ The following methods can be chained onto a `Rules` instance to enforce certain
 Rules->required(bool = true);
 ```
 
-Make a property mandatory by chaining the `required()` method. Omitting this rule will only validate other rules on the property IF the key has been provided in the current scope
+Make a property mandatory by chaining the `required()` method. Omitting this rule will only validate other rules on the property IF the key has been provided in the current scope.
+
+Will set a `Error::MISSING_REQUIRED_PROPERTY` error on the current scope and property if failed.
 
 ## `type()`
 ```php
@@ -87,15 +144,38 @@ Rules->type(Type);
 
 Enforce a data type on the request by chaining the `type()` method and passing it one of the available enum [`Type`](#types)s as its argument.
 
+> [!TIP]
+> Allow multiple types (union) by chaining multiple `type()` methods
+> ```php
+> // Example
+> Rules->type(Type::NUMBER)->type(Type::NULL);
+> ```
+
 ### Types
 Type|Description
 --|--
 `Type::NUMERIC`|Value must be a number or a numeric string
 `Type::STRING`|Value must be a string
-`Type::BOOLEAN`|Value must be a boolean or ([**considered bool for GET rules**](#boolean-coercion-from-string-for-search-parameters))
-`Type::ARRAY`|Value must be a JSON array
+`Type::BOOLEAN`|Value must be a boolean ([**considered bool for GET rules**](#boolean-coercion-from-string-for-search-parameters))
+`Type::ARRAY`|Value must be a JSON array or ([**CSV for GET rules**](#csv-for-search-parameters))
 `Type::OBJECT`|Value must be a JSON object
-`Type::NULL`|Value must be null or ([**considered null for GET rules**](#null-coercion-from-string-for-search-parameters))
+`Type::ENUM`|Value must be exactly one of pre-defined values ([**more information**](#typeenum))
+`Type::NULL`|Value must be null ([**considered null for GET rules**](#null-coercion-from-string-for-search-parameters))
+
+Will set a `Error::INVALID_PROPERTY_TYPE` error on the current scope and property if failed, except Type::ENUM that will set a `Error::INVALID_PROPERTY_VALUE` with an array of the valid vaules.
+
+#### `Type::ENUM`
+
+Provided value for property must be an exact match of any value provided as an `array` to the second argument of `type(Type::ENUM, <whitelist>)`
+```php
+Rules->type(Type::ENUM, [
+  "FOO",
+  "BAR"
+]);
+```
+Any value that isn't `"FOO"` or `"BAR"` will be rejected.
+
+Will set a `Error::INVALID_PROPERTY_VALUE` error on the current scope and property if failed.
 
 #### Boolean coercion from string for search parameters
 Search parameters are read as strings, a boolean is therefor coerced from the following rules.
@@ -114,17 +194,36 @@ Value|Coerced to
 
 Any other value will cause the `type()` rule to fail.
 
-> **Note**
+> [!IMPORTANT]
 > This coercion is only applies for `Ruleset->GET()`. `Ruleset->POST()` will enforce real `true` and `type` values since it's JSON
 
+#### CSV array for search parameters
+A CSV string is expected when `Type::ARRAY` is set for a GET rule.
+
+*Example:*
+```
+https://example.com?typeArray=key1,key2,key3
+```
+
+Any other value will cause the `type()` rule to fail.
+
+> [!IMPORTANT]
+> This coercion is only applies for `Ruleset->GET()`. `Ruleset->POST()` will enforce a JSON array
+
 #### Null coercion from string for search parameters
 Search parameters are read as strings, a null value is therefor coerced from an empty string `""`.
 
 Any value that isn't an empty string will cause the `type()` rule to fail.
 
-> **Note**
+> [!IMPORTANT]
 > This coercion is only applies for `Ruleset->GET()`. `Ruleset->POST()` will enforce the real `null` value since it's JSON
 
+## `default()`
+```php
+Rules->default(mixed);
+```
+Set superglobal property to a defined default value if the property was not provided in superglobal scope
+
 ## `min()`
 ```php
 Rules->min(?int = null);
@@ -139,6 +238,8 @@ Type|Expects
 
 **`min()` will not have an effect on [`Type`](#types)s not provided in this list.**
 
+Will set a `Error::VALUE_MIN_ERROR` error on the current scope and property if failed
+
 ## `max()`
 ```php
 Rules->max(?int = null);
@@ -151,4 +252,6 @@ Type|Expects
 `Type::STRING`|String length to be smaller or equal to provided value
 `Type::ARRAY`, `Type::OBJECT`|Array size or object key count to be smaller or equal to provided value
 
-**`max()` will not have an effect on [`Type`](#types)s not provided in this list.**
+**`max()` will not have an effect on [`Type`](#types)s not provided in this list.**
+
+Will set a `Error::VALUE_MAX_ERROR` error on the current scope and property if failed

composer.json

@@ -14,8 +14,5 @@
         "psr-4": {
             "ReflectRules\\": "src/"
         }
-    },
-    "require": {
-        "victorwesterlund/xenum": "^1.1"
     }
 }

composer.lock

@@ -4,46 +4,8 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "98953f6b9df8b6761e2d57fc66815033",
-    "packages": [
-        {
-            "name": "victorwesterlund/xenum",
-            "version": "1.1.1",
-            "source": {
-                "type": "git",
-                "url": "https://github.com/VictorWesterlund/php-xenum.git",
-                "reference": "8972f06f42abd1f382807a67e937d5564bb89699"
-            },
-            "dist": {
-                "type": "zip",
-                "url": "https://api.github.com/repos/VictorWesterlund/php-xenum/zipball/8972f06f42abd1f382807a67e937d5564bb89699",
-                "reference": "8972f06f42abd1f382807a67e937d5564bb89699",
-                "shasum": ""
-            },
-            "type": "library",
-            "autoload": {
-                "psr-4": {
-                    "victorwesterlund\\": "src/"
-                }
-            },
-            "notification-url": "https://packagist.org/downloads/",
-            "license": [
-                "GPL-3.0-only"
-            ],
-            "authors": [
-                {
-                    "name": "Victor Westerlund",
-                    "email": "victor.vesterlund@gmail.com"
-                }
-            ],
-            "description": "PHP eXtended Enums. The missing quality-of-life features from PHP 8+ Enums",
-            "support": {
-                "issues": "https://github.com/VictorWesterlund/php-xenum/issues",
-                "source": "https://github.com/VictorWesterlund/php-xenum/tree/1.1.1"
-            },
-            "time": "2023-11-20T10:10:39+00:00"
-        }
-    ],
+    "content-hash": "7c02351f2b860153c02a8f683d9c540f",
+    "packages": [],
     "packages-dev": [],
     "aliases": [],
     "minimum-stability": "dev",

src/Rules.php

@@ -2,25 +2,40 @@
 
 	namespace ReflectRules;
 
-	use \victorwesterlund\xEnum;
+	use \ReflectRules\Scope;
 
 	// Supported types for is_type()
 	enum Type {
-		use xEnum;
-		
+		case NULL;
+		case ENUM;
+		case ARRAY;
 		case NUMBER;
 		case STRING;
-		case BOOLEAN;
-		case ARRAY;
 		case OBJECT;
-		case NULL;
+		case BOOLEAN;
 	}
 
 	class Rules {
+		private const CSV_DELIMITER = ",";
+
 		private string $property;
 
+		/*
+			# Rule properties
+			These properties store rules for an instance of a property
+		*/
+
 		public bool $required = false;
-		public ?Type $type = null;
+
+		// Matched Type against $types array
+		private ?Type $type = null;
+		// Typed array of type ReflectRules\Type
+		public ?array $types = null;
+
+		public ?array $enum = null;
+
+		private bool $default_enabled = false;
+		public mixed $default;
 
 		public ?int $min = null;
 		public ?int $max = null;
@@ -46,13 +61,13 @@
 		}
 
 		// Set the minimum lenth/size for property
-		public function min(?int $value = null) {
+		public function min(?int $value = null): self {
 			$this->min = $value;
 			return $this;
 		}
 
 		// Set the maximum length/size for property
-		public function max(?int $value = null) {
+		public function max(?int $value = null): self {
 			$this->max = $value;
 			return $this;
 		}
@@ -63,14 +78,25 @@
 			return $this;
 		}
 
-		// Set property Type
-		public function type(Type|string $type): self {
-			// Coerce string to Type enum
-			if (!($type instanceof Type)) {
-				$type = Type::fromName($string);
+		// Add Type constraint with optional argument
+		public function type(Type $type, mixed $arg = null): self {
+			if ($type === Type::ENUM) {
+				if (!is_array($arg)) {
+					throw new \Exception("Expected type 'array' of ENUM values as second argument");
+				}
+
+				$this->enum = $arg;
 			}
 
-			$this->type = $type;
+			$this->types[] = $type;
+			return $this;
+		}
+
+		// Set a default value if property is not provided
+		public function default(mixed $value): self {
+			$this->default_enabled = true;
+			$this->default = $value;
+			
 			return $this;
 		}
 
@@ -80,44 +106,138 @@
 			Methods are not called until all rules have been defined.
 		*/
 
-		public function eval_required(array $scope): bool {
-			return array_key_exists($this->property, $scope);
+		private function eval_type_boolean(mixed $value, Scope $scope): bool {
+			// Coerce $value to bool primitive from string for GET parameters
+			if ($scope === Scope::GET) {
+				switch ($value) {
+					case "true":
+					case "1":
+					case "on":
+					case "yes":
+						$value = true;
+						break;
+	
+					case "false":
+					case "0":
+					case "off":
+					case "no":
+						$value = false;
+						break;
+	
+					default:
+						$value = null;
+				}
+
+				// Mutate value on superglobal from string to primitive
+				$GLOBALS[$scope->value][$this->property] = $value;
+			}
+
+			return is_bool($value);
 		}
 
-		public function eval_type(mixed $value): bool {
-			return match($this->type) {
-				Type::NUMBER  => is_numeric($value),
-				Type::STRING  => is_string($value),
-				Type::BOOLEAN => is_bool($value),
-				Type::ARRAY   => is_array($value),
-				Type::OBJECT  => $this->eval_object($value),
-				Type::NULL    => is_null($value),
-				default => true
-			};
+		private function eval_type_enum(mixed $value): bool {
+			// Return true if value isn't boolean and exists in enum array
+			return !is_bool($value) && in_array($value, $this->enum);
 		}
 
-		public function eval_min(mixed $value): bool {
+		private function eval_object(mixed $value, Scope $scope): bool {
+			// Arrays in POST parameters should already be decoded
+			if ($scope === Scope::POST) {
+				return is_array($value);
+			}
+
+			// Decode stringified JSON
+			$json = json_decode($value);
+
+			// Failed to decode JSON
+			if ($json === null) {
+				return false;
+			}
+
+			// Mutate property on superglobal with decoded JSON
+			$GLOBALS[Scope::GET->value][$this->property] = $json;
+
+			return true;
+		}
+
+		private function eval_array(string|array $value, Scope $scope): bool {
+			// Arrays in POST parameters should already be decoded
+			if ($scope === Scope::POST) {
+				return is_array($value);
+			}
+
+			// Mutate property on superglobal with decoded CSV if not already an array
+			if (!is_array($_GET[$this->property])) {
+				$GLOBALS[Scope::GET->value][$this->property] = explode(self::CSV_DELIMITER, $_GET[$this->property]);
+			}
+
+			return true;
+		}
+
+		/*
+			## Public eval methods
+			These are the entry-point eval methods that in turn can call other
+			helper methods for fine-graned validation.
+		*/
+
+		public function eval_required(Scope $scope): bool {
+			$scope_data = &$GLOBALS[$scope->value];
+
+			if (array_key_exists($this->property, $scope_data)) {
+				return true;
+			}
+
+			// Property does not exist in superglobal, create one with default value if enabled
+			if ($this->default_enabled) {
+				$scope_data[$this->property] = $this->default;
+			}
+
+			return false;
+		}
+
+		public function eval_type(mixed $value, Scope $scope): bool {
+			$match = false;
+
+			foreach ($this->types as $type) {
+				match($type) {
+					Type::NUMBER  => $match = is_numeric($value),
+					Type::STRING  => $match = is_string($value),
+					Type::BOOLEAN => $match = $this->eval_type_boolean($value, $scope),
+					Type::ARRAY   => $match = $this->eval_array($value, $scope),
+					Type::OBJECT  => $match = $this->eval_object($value, $scope),
+					Type::ENUM    => $match = $this->eval_type_enum($value),
+					Type::NULL    => $match = is_null($value)
+				};
+
+				// Found a matching type
+				if ($match) {
+					// Set the matched Type for use in other rules
+					$this->type = $type;
+					return true;
+				}
+			}
+
+			// No matching types were found
+			return false;
+		}
+
+		public function eval_min(mixed $value, Scope $scope): bool {
 			return match($this->type) {
-				Type::NUMBER => $this->eval_type($value) && $value >= $this->min,
-				Type::STRING => $this->eval_type($value) && strlen($value) >= $this->min,
+				Type::NUMBER => $this->eval_type($value, $scope) && $value >= $this->min,
+				Type::STRING => $this->eval_type($value, $scope) && strlen($value) >= $this->min,
 				Type::ARRAY,
-				Type::OBJECT => $this->eval_type($value) && count($value) >= $this->min,
+				Type::OBJECT => $this->eval_type($value, $scope) && count($GLOBALS[$scope->value][$this->property]) >= $this->min,
 				default => true
 			};
 		}
 
-		public function eval_max(mixed $value): bool {
+		public function eval_max(mixed $value, Scope $scope): bool {
 			return match($this->type) {
-				Type::NUMBER => $this->eval_type($value) && $value <= $this->max,
-				Type::STRING => $this->eval_type($value) && strlen($value) <= $this->max,
+				Type::NUMBER => $this->eval_type($value, $scope) && $value <= $this->max,
+				Type::STRING => $this->eval_type($value, $scope) && strlen($value) <= $this->max,
 				Type::ARRAY,
-				Type::OBJECT => $this->eval_type($value) && count($value) <= $this->max,
+				Type::OBJECT => $this->eval_type($value, $scope) && count($GLOBALS[$scope->value][$this->property]) <= $this->max,
 				default => true
 			};
 		}
-
-		// TODO: Recursive Rules eval of multidimensional object
-		public function eval_object(mixed $object): bool {
-			return is_array($object);
-		}
 	}

src/Ruleset.php

@@ -2,128 +2,182 @@
 
 	namespace ReflectRules;
 
-	// Use the Response class from Reflect to override endpoint processing if requested
-	use \Reflect\Response;
-
 	use \ReflectRules\Rules;
 
-	require_once "../vendor/autoload.php";
+	use \Reflect\Response;
 
 	require_once "Rules.php";
 
+	// Available superglobal scopes
+	enum Scope: string {
+		case GET  = "_GET";
+		case POST = "_POST";
+
+		static function get_array(): array {
+			return [
+				Scope::GET->name  => [],
+				Scope::POST->name => []
+			];
+		}
+	}
+
+	enum Error {
+		case VALUE_MIN_ERROR;
+		case VALUE_MAX_ERROR;
+		case UNKNOWN_PROPERTY_NAME;
+		case INVALID_PROPERTY_TYPE;
+		case INVALID_PROPERTY_VALUE;
+		case MISSING_REQUIRED_PROPERTY;
+	}
+
 	class Ruleset {
-		// This plugin will return exit with a Reflect\Response if errors are found
-		private bool $exit_on_errors;
+		private bool $is_valid = true;
+		private ?bool $strict;
+		private array $errors;
 
-		// Array of RuleError instances
-		private array $errors = [];
+		private array $rules_names;
 
-		public function __construct(bool $exit_on_errors = true) {
-			// Set exit on errors override flag
-			$this->exit_on_errors = $exit_on_errors;
+		public function __construct(bool $strict = false) {
+			/*
+				Strict mode can only be enabled or disabled as a bool argument.
+				'null' is used internally on this property as a re-evaluate flag.
+			*/
+			$this->strict = $strict;
+
+			$this->errors = Scope::get_array();
+			$this->rules_names = Scope::get_array();
 		}
 
-		// Return property names for all Rules in array
-		private static function get_property_names(array $rules): array {
-			return array_map(fn(Rules $rule): string => $rule->get_property_name(), $rules);
-		}
-
-		// ----
-
 		// Append an error to the array of errors
-		private function add_error(string $name, string $message): self {
-			// Create sub array for name if it doesn't exist
-			if (!array_key_exists($name, $this->errors)) {
-				$this->errors[$name] = [];
+		private function add_error(Error $error, Scope $scope, string $property, mixed $expected): void {
+			// Create sub array if this is the first error for this property
+			if (!array_key_exists($property, $this->errors[$scope->name])) {
+				$this->errors[$scope->name][$property] = [];
 			}
 
-			$this->errors[$name][] = $message;
-			return $this;
+			// Set expected value value for property in scope
+			$this->errors[$scope->name][$property][$error->name] = $expected;
+			// Unset valid flag
+			$this->is_valid = false;
 		}
 
-		private function eval_property_name_diff($rules, $scope_keys): void {
-			// Get property names that aren't defiend in the ruleset
-			$invalid_properties = array_diff($scope_keys, self::get_property_names($rules));
+		// Evaluate an array of Rules property names against scope keys
+		private function eval_strict(Scope $scope): void {
+			$name_diffs = array_diff(array_keys($GLOBALS[$scope->value]), $this->rules_names[$scope->name]);
 
-			// Add error for each invalid property name
-			foreach ($invalid_properties as $invalid_property) {
-				$this->add_error($invalid_property, "Unknown property name '{$invalid_property}'");
+			// Set errors for each undefined property
+			foreach ($name_diffs as $name_diff) {
+				$this->add_error(Error::UNKNOWN_PROPERTY_NAME, $scope, $name_diff, null);
 			}
+
+			// Unset strict mode property now that we have evaled it up to this point
+			$this->strict = null;
 		}
 
 		// Evaluate Rules against a given value
-		private function eval_rules(Rules $rules, array &$scope): void {
+		private function eval_rules(Rules $rules, Scope $scope): void {
+			// Get the name of the current property being evaluated
 			$name = $rules->get_property_name();
 
 			// Check if property name exists in scope
 			if (!$rules->eval_required($scope)) {
-				// Set property name value on superglobal to null if not defined
-				$scope[$name] = null;
-
 				// Don't perform further processing if the property is optional and not provided
 				if (!$rules->required) {
 					return;
 				}
 
-				$this->add_error($name, "Value can not be empty");
+				$this->add_error(Error::MISSING_REQUIRED_PROPERTY, $scope, $name, $name);
+				return;
 			}
 
-			$value = $scope[$name];
+			// Get value from scope for the current property
+			$value = $GLOBALS[$scope->value][$name];
 
 			/*
 				Eval each rule that has been set.
 				The error messages will be returned 
 			*/
 
-			if ($rules->type && !$rules->eval_type($value)) {
-				$this->add_error($name, "Value must be of type '{$rules->type->name}'");
+			// Value is not of the correct type or enum value
+			if ($rules->types && !$rules->eval_type($value, $scope)) {
+				if (!$rules->enum) {
+					// Get type names from enum
+					$types = array_map(fn(Type $type): string => $type->name, $rules->types);
+
+					$this->add_error(Error::INVALID_PROPERTY_TYPE, $scope, $name, $types);
+				} else {
+					$this->add_error(Error::INVALID_PROPERTY_VALUE, $scope, $name, $rules->enum);
+				}
 			}
 
-			if ($rules->min && !$rules->eval_min($value)) {
-				$this->add_error($name, "Value must be larger or equal to {$rules->min}");
+			if ($rules->min && !$rules->eval_min($value, $scope)) {
+				$this->add_error(Error::VALUE_MIN_ERROR, $scope, $name, $rules->min);
 			}
 
-			if ($rules->max && !$rules->eval_max($value)) {
-				$this->add_error($name, "Value must be smaller or equal to {$rules->max}");
+			if ($rules->max && !$rules->eval_max($value, $scope)) {
+				$this->add_error(Error::VALUE_MAX_ERROR, $scope, $name, $rules->max);
 			}
 		}
 
-		// Evaluate all Rules in this Ruleset against values in scope and return true if no errors were found
-		private function eval_all_rules(array $rules, array &$scope): bool {
-			foreach ($rules as $rule) {
-				$this->eval_rules($rule, $scope);
-			}
-
-			return empty($this->errors);
-		}
-
 		// ----
 
 		// Perform request processing on GET properties (search parameters)
-		public function GET(array $rules): true|array|Response {
-			$this->eval_property_name_diff($rules, array_keys($_GET));
-
-			$is_valid = $this->eval_all_rules($rules, $_GET);
-
-			// Return errors as a Reflect\Response
-			if (!$is_valid && $this->exit_on_errors) {
-				return new Response($this->errors, 422);
+		public function GET(array $rules): self {
+			// (Re)enable strict mode if property is null
+			if ($this->strict === null) {
+				$this->strict = true;
 			}
 
-			return $is_valid ? true : $this->errors;
+			foreach ($rules as $rule) {
+				$this->rules_names[Scope::GET->name][] = $rule->get_property_name();
+
+				$this->eval_rules($rule, Scope::GET);
+			}
+
+			return $this;
 		}
 
 		// Perform request processing on POST properties (request body)
-		public function POST(array $rules): true|array|Response {
-			$this->eval_property_name_diff($rules, array_keys($_POST));
-
-			$is_valid = $this->eval_all_rules($rules, $_POST);
-
-			// Return errors as a Reflect\Response
-			if (!$is_valid && $this->exit_on_errors) {
-				return new Response($this->errors, 422);
+		public function POST(array $rules): self {
+			// (Re)enable strict mode if property is null
+			if ($this->strict === null) {
+				$this->strict = true;
 			}
 
-			return $is_valid ? true : $this->errors;
+			foreach ($rules as $rule) {
+				$this->rules_names[Scope::POST->name][] = $rule->get_property_name();
+
+				$this->eval_rules($rule, Scope::POST);
+			}
+
+			return $this;
+		}
+
+		// ----
+
+		// Return array of all set Errors
+		public function get_errors(): array {
+			// Strict mode is enabled
+			if ($this->strict === true) {
+				$this->eval_strict(Scope::GET);
+				$this->eval_strict(Scope::POST);
+			}
+
+			return $this->errors;
+		}
+
+		public function is_valid(): bool {
+			// Strict mode is enabled
+			if ($this->strict === true) {
+				$this->eval_strict(Scope::GET);
+				$this->eval_strict(Scope::POST);
+			}
+
+			return $this->is_valid;
+		}
+
+		// Return Reflect\Response with errors and code 422 Unprocessable Content if validation failed
+		public function validate_or_exit(): true|Response {
+			return $this->is_valid() ? true : new Response($this->errors, 422);
 		}
 	}