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<?php |
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namespace TheCodingMachine\GraphQL\Controllers; |
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use function get_class; |
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use GraphQL\Type\Definition\FieldDefinition; |
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use GraphQL\Type\Definition\IDType; |
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use GraphQL\Type\Definition\InputObjectType; |
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use GraphQL\Type\Definition\InputType; |
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use GraphQL\Type\Definition\ListOfType; |
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use GraphQL\Type\Definition\NonNull; |
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use GraphQL\Type\Definition\OutputType; |
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use GraphQL\Type\Definition\ScalarType; |
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use GraphQL\Type\Definition\Type; |
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use InvalidArgumentException; |
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use function is_array; |
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use TheCodingMachine\GraphQL\Controllers\Hydrators\HydratorInterface; |
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use TheCodingMachine\GraphQL\Controllers\Types\DateTimeType; |
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use TheCodingMachine\GraphQL\Controllers\Types\ID; |
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/** |
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* A GraphQL field that maps to a PHP method automatically. |
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*/ |
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class QueryField extends FieldDefinition |
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{ |
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/** |
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* QueryField constructor. |
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* @param string $name |
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* @param OutputType&Type $type |
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* @param array[] $arguments Indexed by argument name, value: ['type'=>InputType, 'defaultValue'=>val]. |
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* @param callable|null $resolve The method to execute |
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* @param string|null $targetMethodOnSource The name of the method to execute on the source object. Mutually exclusive with $resolve parameter. |
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* @param HydratorInterface $hydrator |
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* @param null|string $comment |
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* @param bool $injectSource Whether to inject the source object (for Fields), or null for Query and Mutations |
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* @param array $additionalConfig |
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*/ |
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public function __construct(string $name, OutputType $type, array $arguments, ?callable $resolve, ?string $targetMethodOnSource, HydratorInterface $hydrator, ?string $comment, bool $injectSource, array $additionalConfig = []) |
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{ |
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$config = [ |
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'name' => $name, |
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'type' => $type, |
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'args' => array_map(function(array $item) { return $item['type']; }, $arguments) |
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]; |
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if ($comment) { |
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$config['description'] = $comment; |
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} |
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$config['resolve'] = function ($source, array $args) use ($resolve, $targetMethodOnSource, $arguments, $injectSource, $hydrator) { |
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$toPassArgs = []; |
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if ($injectSource) { |
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$toPassArgs[] = $source; |
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} |
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foreach ($arguments as $name => $arr) { |
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$type = $arr['type']; |
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if (isset($args[$name])) { |
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$val = $this->castVal($args[$name], $type, $hydrator); |
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} elseif (array_key_exists('defaultValue', $arr)) { |
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$val = $arr['defaultValue']; |
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} else { |
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throw new GraphQLException("Expected argument '$name' was not provided."); |
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} |
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$toPassArgs[] = $val; |
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} |
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if ($resolve !== null) { |
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return $resolve(...$toPassArgs); |
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} |
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if ($targetMethodOnSource !== null) { |
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$method = [$source, $targetMethodOnSource]; |
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return $method(...$toPassArgs); |
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} |
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throw new \InvalidArgumentException('The QueryField constructor should be passed either a resolve method or a target method on source object.'); |
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}; |
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$config += $additionalConfig; |
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parent::__construct($config); |
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} |
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private function stripNonNullType(Type $type): Type |
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{ |
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if ($type instanceof NonNull) { |
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return $this->stripNonNullType($type->getWrappedType()); |
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} |
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return $type; |
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} |
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/** |
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* Casts a value received from GraphQL into an argument passed to a method. |
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* |
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* @param mixed $val |
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* @param InputType $type |
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* @return mixed |
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*/ |
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private function castVal($val, InputType $type, HydratorInterface $hydrator) |
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{ |
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$type = $this->stripNonNullType($type); |
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if ($type instanceof ListOfType) { |
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if (!is_array($val)) { |
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throw new InvalidArgumentException('Expected GraphQL List but value passed is not an array.'); |
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} |
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return array_map(function($item) use ($type, $hydrator) { |
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return $this->castVal($item, $type->getWrappedType(), $hydrator); |
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}, $val); |
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} elseif ($type instanceof DateTimeType) { |
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return new \DateTimeImmutable($val); |
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} elseif ($type instanceof IDType) { |
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return new ID($val); |
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} elseif ($type instanceof InputObjectType) { |
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return $hydrator->hydrate($val, $type); |
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} elseif (!$type instanceof ScalarType) { |
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throw new \RuntimeException('Unexpected type: '.get_class($type)); |
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} |
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return $val; |
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} |
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} |
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thecodingmachine /
graphql-controllers
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