simplesamlphp / xml-common

src/Attribute.php

<?php

declare(strict_types=1);

namespace SimpleSAML\XML;

use DOMAttr;
use DOMElement;
use SimpleSAML\XML\Assert\Assert;
use SimpleSAML\XML\Type\{StringValue, ValueTypeInterface};

use function array_keys;
use function strval;

/**
 * Class to represent an arbitrary namespaced attribute.
 *
 * @package simplesamlphp/xml-common
 */
final class Attribute implements ArrayizableElementInterface
{
    /**
     * Create an Attribute class
     *
     * @param string|null $namespaceURI
     * @param string|null $namespacePrefix
     * @param string $attrName
     * @param \SimpleSAML\XML\Type\ValueTypeInterface $attrValue
     */
    public function __construct(
        protected ?string $namespaceURI,
        protected ?string $namespacePrefix,
        protected string $attrName,
        protected ValueTypeInterface $attrValue,
    ) {
        Assert::nullOrValidAnyURI($namespaceURI);
        if ($namespaceURI !== null) {
            Assert::nullOrValidNCName($namespacePrefix);
        }
        Assert::validNCName($attrName);
    }


    /**
     * Collect the value of the namespaceURI-property
     *
     * @return string|null
     */
    public function getNamespaceURI(): ?string
    {
        return $this->namespaceURI;
    }


    /**
     * Collect the value of the namespacePrefix-property
     *
     * @return string|null
     */
    public function getNamespacePrefix(): ?string
    {
        return $this->namespacePrefix;
    }


    /**
     * Collect the value of the localName-property
     *
     * @return string
     */
    public function getAttrName(): string
    {
        return $this->attrName;
    }


    /**
     * Collect the value of the value-property
     *
     * @return \SimpleSAML\XML\Type\ValueTypeInterface
     */
    public function getAttrValue(): ValueTypeInterface
    {
        return $this->attrValue;
    }


    /**
     * Create a class from XML
     *
     * @param \DOMAttr $attr
     * @return static
     */
    public static function fromXML(DOMAttr $attr): static
    {
        return new static($attr->namespaceURI, $attr->prefix, $attr->localName, StringValue::fromString($attr->value));
    }



    /**
     * Create XML from this class
     *
     * @param \DOMElement $parent
     * @return \DOMElement
     */
    public function toXML(DOMElement $parent): DOMElement
    {
        if ($this->getNamespaceURI() !== null && !$parent->lookupPrefix($this->getNamespacePrefix())) {
            $parent->setAttributeNS(
                'http://www.w3.org/2000/xmlns/',
                'xmlns:' . $this->getNamespacePrefix(),
                $this->getNamespaceURI(),
            );
        }

        $parent->setAttributeNS(
            $this->getNamespaceURI(),
            !in_array($this->getNamespacePrefix(), ['', null])
                ? ($this->getNamespacePrefix() . ':' . $this->getAttrName())
                : $this->getAttrName(),
            strval($this->getAttrValue()),
        );

        return $parent;
    }


    /**
     * Create a class from an array
     *
     * @param array{
     *   namespaceURI: string,
     *   namespacePrefix: string|null,
     *   attrName: string,
     *   attrValue:  \SimpleSAML\XML\Type\ValueTypeInterface,
     * } $data
     * @return static
     */
    public static function fromArray(array $data): static
    {
        $data = self::processArrayContents($data);

        return new static(
            $data['namespaceURI'],
            $data['namespacePrefix'],
            $data['attrName'],
            StringValue::fromString($data['attrValue']),
        );
    }


    /**
     * Validates an array representation of this object and returns the same array with rationalized keys
     *
     * @param array{namespaceURI: string, namespacePrefix: string|null, attrName: string, attrValue: mixed} $data
     * @return array{namespaceURI: string, namespacePrefix: string|null, attrName: string, attrValue: mixed}
     */
    private static function processArrayContents(array $data): array
    {
        $data = array_change_key_case($data, CASE_LOWER);

        /** @var array{namespaceuri: string, namespaceprefix: string|null, attrname: string, attrvalue: mixed} $data */
        Assert::allOneOf(
            array_keys($data),
            ['namespaceuri', 'namespaceprefix', 'attrname', 'attrvalue'],
        );

        Assert::keyExists($data, 'namespaceuri');
        Assert::keyExists($data, 'namespaceprefix');
        Assert::keyExists($data, 'attrname');
        Assert::keyExists($data, 'attrvalue');

        Assert::nullOrValidAnyURI($data['namespaceuri']);
        Assert::nullOrValidNCName($data['namespaceprefix']);
        Assert::nullOrValidNCName($data['attrname']);
//        Assert::isAOf($data['attrvalue'], ValueTypeInterface::class);

        return [
            'namespaceURI' => $data['namespaceuri'],
            'namespacePrefix' => $data['namespaceprefix'],
            'attrName' => $data['attrname'],
            'attrValue' => $data['attrvalue'],
        ];
    }


    /**
     * Create an array from this class
     *
     * @return array{

The doc comment array{ at position 2 could not be parsed: the token is null at position 2.

     *   attrName: string,
     *   attrValue: string,
     *   namespacePrefix: string,
     *   namespaceURI: null|string,
     * }
     */
    public function toArray(): array
    {
        return [
            'namespaceURI' => $this->getNamespaceURI(),
            'namespacePrefix' => $this->getNamespacePrefix(),
            'attrName' => $this->getAttrName(),
            'attrValue' => $this->getAttrValue()->getValue(),
        ];
    }
}