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Edit File: PropertyNamesKeyword.php

<?php
/* ============================================================================
 * Copyright 2020 Zindex Software
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============================================================================ */

namespace Opis\JsonSchema\Keywords;

use Opis\JsonSchema\{
    ValidationContext,
    Keyword,
    Schema
};
use Opis\JsonSchema\Errors\ValidationError;

class PropertyNamesKeyword implements Keyword
{
    use ErrorTrait;

/** @var bool|object */
    protected $value;

/**
     * @param bool|object $value
     */
    public function __construct($value)
    {
        $this->value = $value;
    }

/**
     * @inheritDoc
     */
    public function validate(ValidationContext $context, Schema $schema): ?ValidationError
    {
        if ($this->value === true) {
            return null;
        }

$props = $context->getObjectProperties();
        if (!$props) {
            return null;
        }

if ($this->value === false) {
            return $this->error($schema, $context, 'propertyNames', "No properties are allowed");
        }

if (is_object($this->value) && !($this->value instanceof Schema)) {
            $this->value = $context->loader()->loadObjectSchema($this->value);
        }

foreach ($props as $prop) {
            if ($error = $this->value->validate($context->newInstance($prop, $schema))) {
                return $this->error($schema, $context, 'propertyNames', "Property '{property}' must match schema", [
                    'property' => $prop,
                ], $error);
            }
        }

return null;
    }
}

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