silverstripe-cms/code/GraphQL/LinkablePlugin.php

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<?php
namespace SilverStripe\CMS\GraphQL;
use GraphQL\Type\Definition\ResolveInfo;
use SilverStripe\CMS\Model\SiteTree;
use SilverStripe\Core\Config\Configurable;
use SilverStripe\Core\Injector\Injectable;
use SilverStripe\GraphQL\Schema\DataObject\Plugin\QueryFilter\QueryFilter;
use SilverStripe\GraphQL\Schema\Exception\SchemaBuilderException;
use SilverStripe\GraphQL\Schema\Field\ModelQuery;
use SilverStripe\GraphQL\Schema\Interfaces\ModelQueryPlugin;
use SilverStripe\GraphQL\Schema\Schema;
use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\DataList;
if (!interface_exists(ModelQueryPlugin::class)) {
return;
}
class LinkablePlugin implements ModelQueryPlugin
{
use Configurable;
use Injectable;
const IDENTIFIER = 'getByLink';
/**
* @var string
* @config
*/
private static $single_field_name = 'link';
/**
* @var string
* @config
*/
private static $list_field_name = 'links';
/**
* @var array
*/
private static $resolver = [__CLASS__, 'applyLinkFilter'];
/**
* @return string
*/
public function getIdentifier(): string
{
return self::IDENTIFIER;
}
/**
* @param ModelQuery $query
* @param Schema $schema
* @param array $config
*/
public function apply(ModelQuery $query, Schema $schema, array $config = []): void
{
$class = $query->getModel()->getSourceClass();
// Only site trees have the get_by_link capability
if ($class !== SiteTree::class && !is_subclass_of($class, SiteTree::class)) {
return;
}
$singleFieldName = $this->config()->get('single_field_name');
$listFieldName = $this->config()->get('list_field_name');
$fieldName = $query->isList() ? $listFieldName : $singleFieldName;
$type = $query->isList() ? '[String]' : 'String';
$query->addArg($fieldName, $type);
$query->addResolverAfterware(
$config['resolver'] ?? static::config()->get('resolver')
);
}
/**
* @param array $context
* @return callable
*/
public static function applyLinkFilter($obj, array $args, array $context, ResolveInfo $info)
{
$singleFieldName = static::config()->get('single_field_name');
$listFieldName = static::config()->get('list_field_name');
$filterLink = $args['filter'][$singleFieldName] ?? ($args['filter'][$listFieldName] ?? null);
$argLink = $args[$singleFieldName] ?? ($args[$listFieldName] ?? null);
$linkData = $filterLink ?: $argLink;
if (!$linkData) {
return $obj;
}
// Normalise to an array for both cases. The readOne operation will get
// ->first() run on it by the firstResult plugin.
$links = is_array($linkData) ? $linkData : [$linkData];
$result = ArrayList::create();
foreach ($links as $link) {
$page = SiteTree::get_by_link($link);
if ($page) {
$result->push($page);
}
}
return $result;
}
}