/**
* Given a PHP value and a GraphQL type, determine if the value will be
* accepted for that type. This is primarily useful for validating the
* runtime values of query variables.
*
* @param $value
* @param InputType $type
* @return array
*/
private static function isValidPHPValue($value, InputType $type)
{
// A value must be provided if the type is non-null.
if ($type instanceof NonNull) {
$ofType = $type->getWrappedType();
if (null === $value) {
if ($ofType->name) {
return ["Expected \"{$ofType->name}!\", found null."];
}
return ['Expected non-null value, found null.'];
}
return self::isValidPHPValue($value, $ofType);
}
if (null === $value) {
return [];
}
// Lists accept a non-list value as a list of one.
if ($type instanceof ListOfType) {
$itemType = $type->getWrappedType();
if (is_array($value)) {
$tmp = [];
foreach ($value as $index => $item) {
$errors = self::isValidPHPValue($item, $itemType);
$tmp = array_merge($tmp, Utils::map($errors, function ($error) use($index) {
return "In element #{$index}: {$error}";
}));
}
return $tmp;
}
return self::isValidPHPValue($value, $itemType);
}
// Input objects check each defined field.
if ($type instanceof InputObjectType) {
if (!is_object($value) && !is_array($value)) {
return ["Expected \"{$type->name}\", found not an object."];
}
$fields = $type->getFields();
$errors = [];
// Ensure every provided field is defined.
$props = is_object($value) ? get_object_vars($value) : $value;
foreach ($props as $providedField => $tmp) {
if (!isset($fields[$providedField])) {
$errors[] = "In field \"{$providedField}\": Unknown field.";
}
}
// Ensure every defined field is valid.
foreach ($fields as $fieldName => $tmp) {
$newErrors = self::isValidPHPValue(isset($value[$fieldName]) ? $value[$fieldName] : null, $fields[$fieldName]->getType());
$errors = array_merge($errors, Utils::map($newErrors, function ($error) use($fieldName) {
return "In field \"{$fieldName}\": {$error}";
}));
}
return $errors;
}
if ($type instanceof LeafType) {
// Scalar/Enum input checks to ensure the type can parse the value to
// a non-null value.
$parseResult = $type->parseValue($value);
if (null === $parseResult) {
$v = json_encode($value);
return ["Expected type \"{$type->name}\", found {$v}."];
}
return [];
}
throw new InvariantViolation('Must be input type');
}
