WIP : Laravel Validator Implementation

composer.json

@@ -17,7 +17,7 @@
     ],
     "require" : {
         "php" : ">=7.2",
-        "thecodingmachine/graphqlite" : "~4.0.0",
+        "thecodingmachine/graphqlite" : "^4",
         "illuminate/console": "^5.7|^6.0",
         "illuminate/container": "^5.7|^6.0",
         "illuminate/support": "^5.7|^6.0",

src/Annotations/Validate.php

@@ -0,0 +1,53 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheCodingMachine\GraphQLite\Laravel\Annotations;
+
+use BadMethodCallException;
+use TheCodingMachine\GraphQLite\Annotations\MiddlewareAnnotationInterface;
+use TheCodingMachine\GraphQLite\Annotations\ParameterAnnotationInterface;
+use function ltrim;
+
+/**
+ * Use this annotation to validate a parameter for a query or mutation.
+ *
+ * @Annotation
+ * @Target({"METHOD"})
+ * @Attributes({
+ *   @Attribute("for", type = "string"),
+ *   @Attribute("rule", type = "string")
+ * })
+ */
+class Validate implements ParameterAnnotationInterface
+{
+    /** @var string */
+    private $for;
+    /** @var string */
+    private $rule;
+
+    /**
+     * @param array<string, mixed> $values
+     */
+    public function __construct(array $values)
+    {
+        if (! isset($values['for'])) {
+            throw new BadMethodCallException('The @Validate annotation must be passed a target. For instance: "@Validate(for="$email", rule="email")"');
+        }
+        if (! isset($values['rule'])) {
+            throw new BadMethodCallException('The @Validate annotation must be passed a rule. For instance: "@Validate(for="$email", rule="email")"');
+        }
+        $this->for = ltrim($values['for'], '$');
+        $this->rule = $values['rule'] ?? null;
+    }
+
+    public function getTarget(): string
+    {
+        return $this->for;
+    }
+
+    public function getRule(): string
+    {
+        return $this->rule;
+    }
+}

src/Exceptions/ValidateException.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace TheCodingMachine\GraphQLite\Laravel\Exceptions;
+
+use GraphQL\Error\ClientAware;
+use TheCodingMachine\GraphQLite\Exceptions\GraphQLExceptionInterface;
+
+class ValidateException extends \Exception implements GraphQLExceptionInterface
+{
+    /**
+     * @var string
+     */
+    private $argumentName;
+
+    public static function create(string $message, string $argumentName)
+    {
+        $exception = new self($message, 400);
+        $exception->argumentName = $argumentName;
+        return $exception;
+    }
+
+    /**
+     * @return bool
+     */
+    public function isClientSafe()
+    {
+        return true;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCategory()
+    {
+        return 'Validate';
+    }
+
+
+    /**
+     * Returns the "extensions" object attached to the GraphQL error.
+     *
+     * @return array<string, mixed>
+     */
+    public function getExtensions(): array
+    {
+        return [
+            'argument' => $this->argumentName
+        ];
+    }
+}

src/Mappers/Parameters/InvalidValidateAnnotationException.php

@@ -0,0 +1,17 @@
+<?php
+
+
+namespace TheCodingMachine\GraphQLite\Laravel\Mappers\Parameters;
+
+
+use ReflectionParameter;
+
+class InvalidValidateAnnotationException extends \Exception
+{
+    public static function canOnlyValidateInputType(ReflectionParameter $refParameter): self
+    {
+        $class = $refParameter->getDeclaringClass();
+        $method = $refParameter->getDeclaringFunction();
+        return new self('In method '.$class.'::'.$method.', the @Validate annotation is targeting parameter $'.$refParameter->getName().'. You cannot target this parameter because it is not part of the GraphQL Input type. You can only validate parameters coming from the end user.');
+    }
+}

src/Mappers/Parameters/ParameterValidator.php

@@ -0,0 +1,88 @@
+<?php
+
+
+namespace TheCodingMachine\GraphQLite\Laravel\Mappers\Parameters;
+
+
+use GraphQL\Type\Definition\InputType;
+use GraphQL\Type\Definition\ResolveInfo;
+use Illuminate\Validation\Factory as ValidationFactory;
+use TheCodingMachine\GraphQLite\Exceptions\GraphQLAggregateException;
+use TheCodingMachine\GraphQLite\Laravel\Exceptions\ValidateException;
+use TheCodingMachine\GraphQLite\Parameters\InputTypeParameterInterface;
+use TheCodingMachine\GraphQLite\Parameters\ParameterInterface;
+use function array_combine;
+use function array_keys;
+use function implode;
+
+class ParameterValidator implements InputTypeParameterInterface
+{
+    /**
+     * @var InputTypeParameterInterface
+     */
+    private $parameter;
+    /**
+     * @var string
+     */
+    private $rules;
+    /**
+     * @var ValidationFactory
+     */
+    private $validationFactory;
+    /**
+     * @var string
+     */
+    private $parameterName;
+
+    public function __construct(InputTypeParameterInterface $parameter, string $parameterName, string $rules, ValidationFactory $validationFactory)
+    {
+        $this->parameter = $parameter;
+        $this->rules = $rules;
+        $this->validationFactory = $validationFactory;
+        $this->parameterName = $parameterName;
+    }
+
+
+    /**
+     * @param array<string, mixed> $args
+     * @param mixed $context
+     *
+     * @return mixed
+     */
+    public function resolve(?object $source, array $args, $context, ResolveInfo $info)
+    {
+        $value = $this->parameter->resolve($source, $args, $context, $info);
+
+        $validator = $this->validationFactory->make([$this->parameterName => $value], [$this->parameterName => $this->rules]);
+
+        if ($validator->fails()) {
+            $errorMessages = [];
+            foreach ($validator->errors()->toArray() as $field => $errors) {
+                foreach ($errors as $error) {
+                    $errorMessages[] = ValidateException::create($error, $field);
+                }
+            }
+            GraphQLAggregateException::throwExceptions($errorMessages);
+        }
+
+        return $value;
+    }
+
+    public function getType(): InputType
+    {
+        return $this->parameter->getType();
+    }
+
+    public function hasDefaultValue(): bool
+    {
+        return $this->parameter->hasDefaultValue();
+    }
+
+    /**
+     * @return mixed
+     */
+    public function getDefaultValue()
+    {
+        return $this->parameter->getDefaultValue();
+    }
+}

src/Mappers/Parameters/ValidateFieldMiddleware.php

@@ -0,0 +1,78 @@
+<?php
+
+declare(strict_types=1);
+
+namespace TheCodingMachine\GraphQLite\Laravel\Mappers\Parameters;
+
+use Closure;
+use GraphQL\Type\Definition\FieldDefinition;
+use GraphQL\Type\Definition\NonNull;
+use GraphQL\Type\Definition\OutputType;
+use phpDocumentor\Reflection\DocBlock;
+use phpDocumentor\Reflection\Type;
+use Psr\Log\LoggerInterface;
+use ReflectionFunction;
+use ReflectionParameter;
+use Symfony\Component\ExpressionLanguage\ExpressionLanguage;
+use TheCodingMachine\GraphQLite\Annotations\FailWith;
+use TheCodingMachine\GraphQLite\Annotations\ParameterAnnotations;
+use TheCodingMachine\GraphQLite\Annotations\Security;
+use TheCodingMachine\GraphQLite\Laravel\Annotations\Validate;
+use TheCodingMachine\GraphQLite\Mappers\Parameters\ParameterHandlerInterface;
+use TheCodingMachine\GraphQLite\Mappers\Parameters\ParameterMiddlewareInterface;
+use TheCodingMachine\GraphQLite\Parameters\InputTypeParameterInterface;
+use TheCodingMachine\GraphQLite\Parameters\ParameterInterface;
+use TheCodingMachine\GraphQLite\QueryFieldDescriptor;
+use TheCodingMachine\GraphQLite\Security\AuthenticationServiceInterface;
+use TheCodingMachine\GraphQLite\Middlewares\FieldMiddlewareInterface;
+use TheCodingMachine\GraphQLite\Security\AuthorizationServiceInterface;
+use TheCodingMachine\GraphQLite\Middlewares\FieldHandlerInterface;
+use TheCodingMachine\GraphQLite\Annotations\ParameterAnnotationInterface;
+use TheCodingMachine\GraphQLite\Laravel\Exceptions\ValidateException;
+use Throwable;
+use Webmozart\Assert\Assert;
+use function array_combine;
+use function array_keys;
+use function array_map;
+use function array_merge;
+use function implode;
+use function is_array;
+use function is_object;
+use Illuminate\Validation\Factory as ValidationFactory;
+
+/**
+ * A field middleware that reads "Security" Symfony annotations.
+ */
+class ValidateFieldMiddleware implements ParameterMiddlewareInterface
+{
+    /**
+     * @var ValidationFactory
+     */
+    private $validationFactory;
+
+    public function __construct(ValidationFactory $validationFactory)
+    {
+        $this->validationFactory = $validationFactory;
+    }
+
+    public function mapParameter(ReflectionParameter $refParameter, DocBlock $docBlock, ?Type $paramTagType, ParameterAnnotations $parameterAnnotations, ParameterHandlerInterface $next): ParameterInterface
+    {
+        /** @var Validate[] $validateAnnotations */
+        $validateAnnotations = $parameterAnnotations->getAnnotationsByType(Validate::class);
+
+        $parameter = $next->mapParameter($refParameter, $docBlock, $paramTagType, $parameterAnnotations);
+
+        if (empty($validateAnnotations)) {
+            return $parameter;
+        }
+
+        if (!$parameter instanceof InputTypeParameterInterface) {
+            throw InvalidValidateAnnotationException::canOnlyValidateInputType($refParameter);
+        }
+
+        // Let's wrap the ParameterInterface into a ParameterValidator.
+        $rules = array_map(static function(Validate $validateAnnotation): string { return $validateAnnotation->getRule(); }, $validateAnnotations);
+
+        return new ParameterValidator($parameter, $refParameter->getName(), implode('|', $rules), $this->validationFactory);
+    }
+}

src/Providers/GraphQLiteServiceProvider.php

@@ -4,6 +4,8 @@
 
 use Illuminate\Contracts\Auth\Access\Gate;
 use Illuminate\Contracts\Auth\Factory as AuthFactory;
+use TheCodingMachine\GraphQLite\Exceptions\WebonyxErrorHandler;
+use TheCodingMachine\GraphQLite\Laravel\Mappers\Parameters\ValidateFieldMiddleware;
 use TheCodingMachine\GraphQLite\Laravel\Mappers\PaginatorTypeMapper;
 use TheCodingMachine\GraphQLite\Laravel\Mappers\PaginatorTypeMapperFactory;
 use TheCodingMachine\GraphQLite\Laravel\Security\AuthenticationService;
@@ -68,6 +70,8 @@ public function register()
         $this->app->singleton(ServerConfig::class, function (Application $app) {
             $serverConfig = new ServerConfig();
             $serverConfig->setSchema($app[Schema::class]);
+            $serverConfig->setErrorFormatter([WebonyxErrorHandler::class, 'errorFormatter']);
+            $serverConfig->setErrorsHandler([WebonyxErrorHandler::class, 'errorHandler']);
             return $serverConfig;
         });
 
@@ -93,6 +97,8 @@ public function register()
             $service = new SchemaFactory($app->make('graphqliteCache'), new SanePsr11ContainerAdapter($app));
             $service->setAuthenticationService($app[AuthenticationService::class]);
             $service->setAuthorizationService($app[AuthorizationService::class]);
+            $service->addParameterMiddleware($app[ValidateFieldMiddleware::class]);
+
             $service->addTypeMapperFactory($app[PaginatorTypeMapperFactory::class]);
 
             $controllers = config('graphqlite.controllers', 'App\\Http\\Controllers');

tests/Fixtures/App/Http/Controllers/TestController.php

@@ -7,6 +7,7 @@
 use Illuminate\Pagination\LengthAwarePaginator;
 use TheCodingMachine\GraphQLite\Annotations\Logged;
 use TheCodingMachine\GraphQLite\Annotations\Query;
+use TheCodingMachine\GraphQLite\Laravel\Annotations\Validate;
 
 class TestController
 {
@@ -35,4 +36,23 @@ public function testPaginator(): LengthAwarePaginator
     {
         return new LengthAwarePaginator([1,2,3,4], 42, 4, 2);
     }
+
+    /**
+     * @Query()
+     * @Validate(for="foo", rule="email")
+     * @Validate(for="bar", rule="gt:42")
+     */
+    public function testValidator(string $foo, int $bar): string
+    {
+        return 'success';
+    }
+
+    /**
+     * @Query()
+     * @Validate(for="foo", rule="starts_with:192|ipv4")
+     */
+    public function testValidatorMultiple(string $foo): string
+    {
+        return 'success';
+    }
 }