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<?php |
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/* |
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* This file is part of the JVal package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace JVal; |
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use stdClass; |
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/** |
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* Implements the three steps needed to perform a JSON Schema validation, |
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* i.e. distinct methods to recursively:. |
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* |
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* 1) resolve JSON pointer references within schema |
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* 2) normalize and validate the syntax of the schema |
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* 3) validate a given instance against it |
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*/ |
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class Walker |
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{ |
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/** |
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* @var Registry |
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*/ |
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private $registry; |
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/** |
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* @var Resolver |
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*/ |
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private $resolver; |
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/** |
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* @var array |
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*/ |
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private $parsedSchemas = []; |
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/** |
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* @var array |
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*/ |
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private $resolvedSchemas = []; |
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/** |
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* @var Constraint[][] |
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*/ |
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private $constraintsCache = []; |
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/** |
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* Constructor. |
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* |
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* @param Registry $registry |
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* @param Resolver $resolver |
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*/ |
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public function __construct(Registry $registry, Resolver $resolver) |
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{ |
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$this->registry = $registry; |
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$this->resolver = $resolver; |
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} |
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/** |
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* Recursively resolve JSON pointer references within a given schema. |
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* |
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* @param stdClass $schema The schema to resolve |
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* @param Uri $uri The URI of the schema |
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* |
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* @return stdClass |
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*/ |
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public function resolveReferences(stdClass $schema, Uri $uri) |
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{ |
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$this->resolver->initialize($schema, $uri); |
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return $this->doResolveReferences($schema, $uri); |
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} |
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/** |
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* @param stdClass $schema |
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* @param Uri $uri |
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* |
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* @return stdClass |
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*/ |
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private function doResolveReferences(stdClass $schema, Uri $uri) |
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{ |
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if ($this->isLooping($schema, $this->resolvedSchemas)) { |
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return $schema; |
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} |
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$inScope = false; |
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if (property_exists($schema, 'id') && is_string($schema->id)) { |
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$this->resolver->enter(new Uri($schema->id)); |
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$inScope = true; |
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} |
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if (property_exists($schema, '$ref')) { |
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$resolved = $this->resolver->resolve($schema); |
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$this->resolver->enter($resolved[0], $resolved[1]); |
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$schema = $this->doResolveReferences($resolved[1], $resolved[0]); |
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$this->resolver->leave(); |
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} else { |
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foreach ($schema as $property => $value) { |
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if (is_object($value)) { |
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$schema->{$property} = $this->doResolveReferences($value, $uri); |
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} elseif (is_array($value)) { |
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foreach ($value as $index => $element) { |
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if (is_object($element)) { |
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$schema->{$property}[$index] = $this->doResolveReferences($element, $uri); |
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} |
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} |
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} |
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} |
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} |
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if ($inScope) { |
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$this->resolver->leave(); |
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} |
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return $schema; |
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} |
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/** |
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* Recursively normalizes a given schema and validates its syntax. |
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* |
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* @param stdClass $schema |
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* @param Context $context |
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* |
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* @return stdClass |
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*/ |
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public function parseSchema(stdClass $schema, Context $context) |
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{ |
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if ($this->isLooping($schema, $this->parsedSchemas)) { |
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return $schema; |
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} |
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if (isset($schema->{'$schema'})) { |
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$context->setVersion($schema->{'$schema'}); |
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} |
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$version = $context->getVersion(); |
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$constraints = $this->registry->getConstraints($version); |
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$constraints = $this->filterConstraintsForSchema($constraints, $schema); |
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foreach ($constraints as $constraint) { |
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$constraint->normalize($schema, $context, $this); |
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} |
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return $schema; |
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} |
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/** |
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* Validates an instance against a given schema, populating a context |
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* with encountered violations. |
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* |
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* @param mixed $instance |
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* @param stdClass $schema |
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* @param Context $context |
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*/ |
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public function applyConstraints($instance, stdClass $schema, Context $context) |
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{ |
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if (isset($schema->{'$schema'})) { |
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$context->setVersion($schema->{'$schema'}); |
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} |
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$cacheKey = gettype($instance).spl_object_hash($schema); |
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$constraints = & $this->constraintsCache[$cacheKey]; |
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if ($constraints === null) { |
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$version = $context->getVersion(); |
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$instanceType = Types::getPrimitiveTypeOf($instance); |
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$constraints = $this->registry->getConstraintsForType($version, $instanceType); |
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$constraints = $this->filterConstraintsForSchema($constraints, $schema); |
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} |
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foreach ($constraints as $constraint) { |
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$constraint->apply($instance, $schema, $context, $this); |
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} |
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} |
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/** |
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* Checks if given schema has been already visited. |
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* |
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* @param stdClass $schema |
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* @param array $stack |
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* |
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* @return bool |
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*/ |
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private function isLooping(stdClass $schema, array &$stack) |
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{ |
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$schemaHash = spl_object_hash($schema); |
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if (isset($stack[$schemaHash])) { |
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return true; |
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} |
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$stack[$schemaHash] = true; |
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return false; |
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} |
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/** |
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* Filters constraints which should be triggered for given schema. |
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* |
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* @param Constraint[] $constraints |
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* @param stdClass $schema |
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* |
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* @return Constraint[] |
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*/ |
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private function filterConstraintsForSchema(array $constraints, stdClass $schema) |
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{ |
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$filtered = []; |
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foreach ($constraints as $constraint) { |
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foreach ($constraint->keywords() as $keyword) { |
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if (property_exists($schema, $keyword)) { |
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$filtered[] = $constraint; |
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break; |
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} |
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} |
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} |
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return $filtered; |
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} |
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} |
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stefk /
JVal
