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JsonSchema.php
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JsonSchema.php
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<?php
namespace JsonSchema;
use JsonRef\JsonDocs;
use JsonSchema\Constraint\EmptyConstraint;
/**
* Instances of this class hold a valid JSON Schema validator.
* Also provides resolution of pointers to valid JSON Schema validators.
*/
class JsonSchema
{
private $doc;
private $rootSymbol;
/**
* Construct a validator from a JSON document data structure.
* Note the $doc structure underlying the JsonDocs is mutated to aid in stuff.
*/
public function __construct($doc, array $customConstraints = []) {
$this->doc = $this->tryDecode($doc);
EmptyConstraint::addConstraints($customConstraints);
$this->rootSymbol = EmptyConstraint::build($this->doc);
}
/**
* Validate $doc against the schema.
* @input $doc Mixed the target of validation.
* @input $pointer A JSON Pointer pointing into the schema.
*/
public function validate($doc, $pointer = "/") {
$schema = $this->rootSymbol;
$codeProp = EmptyConstraint::getCodeProp();
if($pointer !== "/") {
$schema = JsonDocs::getPointer($this->doc, $pointer);
if(!isset($schema->$codeProp)) {
throw new \InvalidArgumentException("Could not resolve pointer $pointer");
}
$schema = $schema->$codeProp;
}
return $schema->validate($doc, "/");
}
/**
* Sometimes client pass string expecting it do be decoded. In that case input is a string. But
* decoded value could be a string too ... in that case if it decodes, return decoded value.
* Imperfect but failure modes are very edge.
*/
private function tryDecode($doc) {
if(is_string($doc)) {
$_doc = json_decode($doc);
return $_doc !== null ? $_doc: $doc;
}
return $doc;
}
}