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<?php |
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namespace GraphQL\Examples\Blog\Type\Scalar; |
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use GraphQL\Error\Error; |
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use GraphQL\Language\AST\Node; |
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use GraphQL\Language\AST\StringValueNode; |
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use GraphQL\Type\Definition\ScalarType; |
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use GraphQL\Utils\Utils; |
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class UrlType extends ScalarType |
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{ |
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/** |
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* Serializes an internal value to include in a response. |
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* |
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* @param mixed $value |
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* @return mixed |
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*/ |
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public function serialize($value) |
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{ |
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// Assuming internal representation of url is always correct: |
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return $value; |
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// If it might be incorrect and you want to make sure that only correct values are included in response - |
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// use following line instead: |
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// return $this->parseValue($value); |
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} |
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/** |
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* Parses an externally provided value (query variable) to use as an input |
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* |
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* @param mixed $value |
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* @return mixed |
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* @throws Error |
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*/ |
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public function parseValue($value) |
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{ |
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if (!is_string($value) || !filter_var($value, FILTER_VALIDATE_URL)) { // quite naive, but after all this is example |
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throw new Error("Cannot represent value as URL: " . Utils::printSafe($value)); |
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} |
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return $value; |
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} |
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/** |
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* Parses an externally provided literal value to use as an input (e.g. in Query AST) |
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* |
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* @param Node $valueNode |
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* @param array|null $variables |
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* @return null|string |
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* @throws Error |
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*/ |
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public function parseLiteral(Node $valueNode, ?array $variables = null) |
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{ |
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// Note: throwing GraphQL\Error\Error vs \UnexpectedValueException to benefit from GraphQL |
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// error location in query: |
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if (!($valueNode instanceof StringValueNode)) { |
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throw new Error('Query error: Can only parse strings got: ' . $valueNode->kind, [$valueNode]); |
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} |
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if (!is_string($valueNode->value) || !filter_var($valueNode->value, FILTER_VALIDATE_URL)) { |
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throw new Error('Query error: Not a valid URL', [$valueNode]); |
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} |
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return $valueNode->value; |
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} |
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} |
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simPod /
graphql-php
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