Imported code from old repository

CloudObjects/SDK/JSON/SchemaValidator.php

@@ -0,0 +1,76 @@
+<?php
+
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+namespace CloudObjects\SDK\JSON;
+
+use ML\IRI\IRI;
+use ML\JsonLD\Node;
+use Webmozart\Assert\Assert;
+use CloudObjects\SDK\ObjectRetriever, CloudObjects\SDK\NodeReader;
+
+/**
+ * The schema validator enables the validation of data against
+ * JSON schemas in the CloudObjects RDF format.
+ */
+class SchemaValidator {
+
+    private $objectRetriever;
+    private $reader;
+
+    /**
+     * @param ObjectRetriever $objectRetriever An initialized and authenticated object retriever.
+     */
+    public function __construct(ObjectRetriever $objectRetriever) {
+        $this->objectRetriever = $objectRetriever;
+        $this->reader = new NodeReader([
+            'prefixes' => [
+                'json' => 'coid://json.co-n.net/'
+            ]
+        ]);
+    }
+
+    /**
+     * Validate data against an element specification in an RDF node.
+     * 
+     * @param mixed $data The data to validate.
+     * @param Node $node The specification to validate against.
+     */
+    public function validateAgainstNode($data, Node $node) {
+        if ($this->reader->hasType($node, 'json:String'))
+            Assert::string($data);
+        elseif ($this->reader->hasType($node, 'json:Boolean'))
+            Assert::boolean($data);
+        elseif ($this->reader->hasType($node, 'json:Number'))
+            Assert::numeric($data);
+        elseif ($this->reader->hasType($node, 'json:Integer'))
+            Assert::integer($data);
+        elseif ($this->reader->hasType($node, 'json:Array'))
+            Assert::isArray($data);
+        elseif ($this->reader->hasType($node, 'json:Object')) {
+            Assert::isArrayAccessible($data);
+            foreach ($this->reader->getAllValuesNode($node, 'json:hasProperty') as $prop) {
+                $key = $this->reader->getFirstValueString($prop, 'json:hasKey');
+                if ($this->reader->getFirstValueBool($prop, 'json:isRequired') == true)
+                    Assert::keyExists($data, $key);
+                if (isset($data[$key]))
+                    $this->validateAgainstNode($data[$key], $prop);
+            }
+        }
+    }
+
+    /**
+     * Validate data against a specification stored in CloudObjects.
+     * 
+     * @param mixed $data The data to validate.
+     * @param Node $node The COID of the specification.
+     */
+    public function validateAgainstCOID($data, IRI $coid) {
+        $object = $this->objectRetriever->getObject($coid);
+        Assert::true($this->reader->hasType($object, 'json:Element'),
+            "You can only validate data against JSON elements!");
+        $this->validateAgainstNode($data, $object);
+    }
+}