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<?php
declare(strict_types=1);
namespace Asko\Hird;
use Asko\Hird\Validators\DateFormatValidator;
use Asko\Hird\Validators\Validator;
use Asko\Hird\Validators\LenValidator;
use Asko\Hird\Validators\EmailValidator;
use Asko\Hird\Validators\RequiredValidator;
/**
* Hird takes in an array of `$fields` and an array of
* `$rules`.
*
* The key of each item in the `$fields` array must correspond to the
* the key of each item in the `$rules` array, so that Bouncer
* would know how to connect the two to each other.
*
* The `$rules` must have a value that is a string where the rules
* are separated by a `|` character, and each rule must match the key of
* the implemented validator, such as `len`, `email` or one that you have
* implemented yourself. Additionally, each rule can take in a modifier,
* where the name of the rule and the modifier is separated by a `:` character.
*
* For example, say we have a validator called `len` which takes a modifier that
* lets that validator validate the length of a string, in such a case we'd write
* that rule as `len:8`, which would indicate using a `len` validator and passing
* a modifier with the value `8` to it.
*
* Example usage of Hird:
*
* ```php
* $fields = ['email' => 'asko@bien.ee'];
* $rules = ['email' => 'required|email'];
* $hird = new Hird($fields, $rules);
*
* if ($hird->fails()) {
* return $hird->errors();
* }
* ```
*
* @author Asko Nomm <asko@asko.dev>
*/
class Hird
{
private array $errors = [];
private array $validators = [];
private array $fieldNames = [];
public function __construct(
private array $fields,
private array $rules,
array $fieldNames = []
) {
$this->composeFieldNames($fieldNames);
$this->registerDefaultValidators();
}
/**
* Registers the default, built-in validators.
*
* @return void
*/
private function registerDefaultValidators(): void
{
$this->registerValidator('len', LenValidator::class);
$this->registerValidator('email', EmailValidator::class);
$this->registerValidator('required', RequiredValidator::class);
$this->registerValidator('date-format', DateFormatValidator::class);
}
/**
* Composes the field names array.
*
* @param array $fieldNames
* @return void
*/
private function composeFieldNames(array $fieldNames): void
{
$updatedFieldNames = [];
foreach ($this->fields as $field => $value) {
$updatedFieldNames[$field] = $fieldNames[$field] ?? $field;
}
$this->fieldNames = $updatedFieldNames;
}
/**
* Registers a validator to a `$ruleName`.
*
* @param string $ruleName
* @param Validator $validator
* @return void
*/
public function registerValidator(string $ruleName, string $validator): void
{
$class = new \ReflectionClass($validator);
$instance = null;
if ($class->getConstructor() !== null) {
$instance = $class->newInstanceArgs([$this->fields, $this->fieldNames]);
} else {
$instance = $class->newInstance();
}
$this->validators[$ruleName] = $instance;
}
/**
* Removes a validator assigned to the `$ruleName`.
*
* @param string $ruleName
* @return void
*/
public function removeValidator(string $ruleName): void
{
unset($this->validators[$ruleName]);
}
/**
* Runs `$this->rules` over `$this->fields` to construct
* potential errors that will be stored as an array of strings
* in `$this->errors`.
*
* @return void
*/
public function validate(): void
{
foreach ($this->rules as $field => $rule) {
$value = isset($this->fields[$field]) ? $this->fields[$field] : '';
foreach (explode('|', $rule) as $item) {
if (str_contains($item, ':')) {
$itemParts = explode(':', $item);
$name = $itemParts[0];
$modifier = implode(':', array_slice($itemParts, 1, count($itemParts) - 1, true));
if (!$this->validators[$name]->validate($field, $value, $modifier)) {
$this->errors[] = $this->validators[$name]->composeError($field, $modifier);
}
} else {
if (!$this->validators[$item]->validate($field, $value)) {
$this->errors[] = $this->validators[$item]->composeError($field);
}
}
}
}
}
/**
* Returns a boolean `true` if there have been any errors.
* Returns `false` otherwise.
*
* @return boolean
*/
public function fails(): bool
{
$this->validate();
return count($this->errors) !== 0;
}
/**
* Returns an array of strings where each string
* is a single error that happened during validation.
*
* @return array
*/
public function errors(): array
{
return $this->errors;
}
/**
* If errors are present, returns the first one.
* Otherwise returns an empty string.
*
* @return string
*/
public function firstError(): string
{
if (count($this->errors) > 0) {
return $this->errors[0];
}
return '';
}
}
|
