Implemented conditions handler for product-list widget

src/Plugin/Resolver/Argument/AstConverterPlugin.php

@@ -0,0 +1,155 @@
+<?php
+/**
+ * ScandiPWA_CatalogGraphQl
+ *
+ * @category    ScandiPWA
+ * @package     ScandiPWA_CatalogGraphQl
+ * @author      Viktors Pliska <[email protected]>
+ * @copyright   Copyright (c) 2018 Scandiweb, Ltd (https://scandiweb.com)
+ */
+
+declare(strict_types=1);
+
+namespace ScandiPWA\CatalogGraphQl\Plugin\Resolver\Argument;
+
+use Magento\Catalog\Model\Product;
+use Magento\Catalog\Model\ResourceModel\Product\CollectionFactory;
+use Magento\CatalogWidget\Model\Rule;
+use Magento\Framework\Exception\LocalizedException;
+use Magento\Framework\GraphQl\Query\Resolver\Argument\AstConverter;
+use Magento\Framework\GraphQl\Query\Resolver\Argument\FieldEntityAttributesPool;
+use Magento\Framework\GraphQl\Query\Resolver\Argument\Filter\ClauseFactory;
+use Magento\Rule\Model\Condition\Combine;
+use Magento\Rule\Model\Condition\Sql\Builder;
+use Magento\Widget\Helper\Conditions;
+
+class AstConverterPlugin {
+    /** @var Conditions */
+    protected $conditionsHelper;
+
+    /** @var Rule */
+    protected $rule;
+
+    /** @var FieldEntityAttributesPool */
+    protected $fieldEntityAttributesPool;
+
+    /** @var CollectionFactory */
+    protected $productCollectionFactory;
+
+    /** @var Builder */
+    protected $sqlBuilder;
+
+    /** @var ClauseFactory */
+    protected $clauseFactory;
+
+    /**
+     * AstConverterPlugin constructor.
+     * @param Conditions $conditionsHelper
+     * @param Rule $rule
+     * @param ClauseFactory $clauseFactory
+     * @param FieldEntityAttributesPool $fieldEntityAttributesPool
+     * @param Builder $sqlBuilder
+     * @param CollectionFactory $productCollectionFactory
+     */
+    public function __construct(
+        Conditions $conditionsHelper,
+        Rule $rule,
+        ClauseFactory $clauseFactory,
+        FieldEntityAttributesPool $fieldEntityAttributesPool,
+        Builder $sqlBuilder,
+        CollectionFactory $productCollectionFactory
+    ) {
+        $this->fieldEntityAttributesPool = $fieldEntityAttributesPool;
+        $this->conditionsHelper = $conditionsHelper;
+        $this->clauseFactory = $clauseFactory;
+        $this->rule = $rule;
+        $this->sqlBuilder = $sqlBuilder;
+        $this->productCollectionFactory = $productCollectionFactory;
+    }
+
+    /**
+     * Get conditions
+     *
+     * @param $conditions
+     * @return Combine
+     */
+    protected function getConditions($conditions)
+    {
+        $conditions = $this->conditionsHelper->decode($conditions);
+
+        foreach ($conditions as $key => $condition) {
+            if (!empty($condition['attribute'])
+                && in_array($condition['attribute'], ['special_from_date', 'special_to_date'])
+            ) {
+                $conditions[$key]['value'] = date('Y-m-d H:i:s', strtotime($condition['value']));
+            }
+        }
+
+        $this->rule->loadPost(['conditions' => $conditions]);
+        return $this->rule->getConditions();
+    }
+
+    /**
+     * @param $conditionValue
+     * @return array
+     * @throws LocalizedException
+     */
+    protected function loadProductSKUs($conditionValue): array {
+        $conditionDecodedValue = base64_decode($conditionValue);
+        $collection = $this->productCollectionFactory->create();
+        $conditions = $this->getConditions($conditionDecodedValue);
+        $conditions->collectValidatedAttributes($collection);
+        $this->sqlBuilder->attachConditionToCollection($collection, $conditions);
+        $collection->addAttributeToSelect('sku');
+
+        $SKUs = [];
+        foreach ($collection->getItems() as $item) {
+            $SKUs[] = $item->getSku();
+        }
+
+        return $SKUs;
+    }
+
+    /**
+     * @param AstConverter $subject
+     * @param callable $next
+     * @param string $fieldName
+     * @param array $arguments
+     * @return array
+     * @throws LocalizedException
+     */
+    public function aroundGetClausesFromAst(
+        AstConverter $subject,
+        callable $next,
+        string $fieldName,
+        array $arguments
+    ): array {
+        if (!array_key_exists('conditions', $arguments)) {
+            return $next($fieldName, $arguments);
+        }
+
+        $conditionArgument = $arguments['conditions'];
+        $conditionArgumentType = array_key_first($conditionArgument);
+
+        if ($conditionArgumentType !== 'eq') {
+            throw new LocalizedException(__("'conditions' field only supports 'eq' condition type."));
+        }
+
+        /**
+         * This I think, might be in-efficient, or even dangerous. This will loop-over
+         * all the product to match the criteria... Not sure how will this work in 2.4.x
+         * Magento. HOWEVER, this seems the only reliable option we have!
+         */
+        $SKUs = $this->loadProductSKUs($conditionArgument[$conditionArgumentType]);
+        unset($arguments['conditions']); // drop conditions from filters
+
+        $conditions = $next($fieldName, $arguments);
+        array_push($conditions, $this->clauseFactory->create(
+            'sku',
+            'in',
+            $SKUs
+        ));
+
+        return $conditions;
+    }
+}

src/etc/graphql/di.xml

@@ -11,6 +11,15 @@
  */
 -->
 <config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
+<!--    <type name="Magento\Framework\GraphQl\Query\Resolver\Argument\AstConverter">-->
+<!--        <plugin-->
+<!--            name="condition-applier-plugin"-->
+<!--            type="ScandiPWA\CatalogGraphQl\Plugin\Resolver\Argument\AstConverterPlugin"-->
+<!--            sortOrder="1"-->
+<!--            disabled="false"-->
+<!--        />-->
+<!--    </type>-->
+
     <virtualType name="ScandiPWA\CatalogGraphQl\Model\Resolver\Products\SearchCriteria\CollectionProcessor\ProductFilterProcessor" type="ScandiPWA\CatalogGraphQl\Model\Resolver\Products\SearchCriteria\CollectionProcessor\FilterProcessor">
         <arguments>
             <argument name="customFilters" xsi:type="array">