Handled different coverage of field criteria across search engines

The Legacy and Solr search engines don't support the same fields as field criteria.
This delegates checking for that to SearchFeature objects specialized depending on the engine type.

src/DependencyInjection/Factory/SearchFeaturesFactory.php

@@ -0,0 +1,34 @@
+<?php
+namespace EzSystems\EzPlatformGraphQL\DependencyInjection\Factory;
+
+use eZ\Bundle\EzPublishCoreBundle\ApiLoader\RepositoryConfigurationProvider;
+
+class SearchFeaturesFactory
+{
+    /**
+     * @var \eZ\Bundle\EzPublishCoreBundle\ApiLoader\RepositoryConfigurationProvider
+     */
+    private $configurationProvider;
+
+    /**
+     * @var \EzSystems\EzPlatformGraphQL\Search\SearchFeatures[]
+     */
+    private $searchFeatures = [];
+
+    public function __construct(RepositoryConfigurationProvider $configurationProvider, array $searchFeatures)
+    {
+        $this->configurationProvider = $configurationProvider;
+        $this->searchFeatures = $searchFeatures;
+    }
+
+    public function build()
+    {
+        $searchEngine = $this->configurationProvider->getRepositoryConfig()['search']['engine'];
+
+        if (isset($this->searchFeatures[$searchEngine])) {
+            return $this->searchFeatures[$searchEngine];
+        } else {
+            throw new \InvalidArgumentException("Search engine not found");
+        }
+    }
+}

src/Resources/config/services.yml

@@ -20,3 +20,20 @@ services:
             - { name: "overblog_graphql.mutation", alias: "DeleteSection", method: "deleteSection" }
 
     EzSystems\EzPlatformGraphQL\GraphQL\InputMapper\SearchQueryMapper: ~
+
+    EzSystems\EzPlatformGraphQL\DependencyInjection\Factory\SearchFeaturesFactory:
+        arguments:
+            $configurationProvider: '@ezpublish.api.repository_configuration_provider'
+            $searchFeatures:
+                solr: '@EzSystems\EzPlatformGraphQL\Search\SolrSearchFeatures'
+                legacy: '@EzSystems\EzPlatformGraphQL\Search\LegacySearchFeatures'
+
+    EzSystems\EzPlatformGraphQL\Search\SearchFeatures:
+        factory: ['@EzSystems\EzPlatformGraphQL\DependencyInjection\Factory\SearchFeaturesFactory', build]
+
+    EzSystems\EzPlatformGraphQL\Search\LegacySearchFeatures:
+        arguments:
+            $converterRegistry: '@ezpublish.persistence.legacy.field_value_converter.registry'
+
+    EzSystems\EzPlatformGraphQL\Search\SolrSearchFeatures: ~
+

src/Schema/Domain/Content/Worker/FieldDefinition/AddFieldDefinitionToCollectionFilters.php

@@ -0,0 +1,87 @@
+<?php
+namespace EzSystems\EzPlatformGraphQL\Schema\Domain\Content\Worker\FieldDefinition;
+
+use eZ\Publish\API\Repository\Values\ContentType\ContentType;
+use eZ\Publish\API\Repository\Values\ContentType\FieldDefinition;
+use EzSystems\EzPlatformGraphQL\Schema\Builder;
+use EzSystems\EzPlatformGraphQL\Schema\Domain\Content\Worker\BaseWorker;
+use EzSystems\EzPlatformGraphQL\Schema\Worker;
+use EzSystems\EzPlatformGraphQL\Search\SearchFeatures;
+
+/**
+ * Adds the field definition, if it is searchable, as a filter on the type's collection.
+ */
+class AddFieldDefinitionToCollectionFilters extends BaseWorker implements Worker
+{
+    /**
+     * @var SearchFeatures
+     */
+    private $searchFeatures;
+
+    public function __construct(SearchFeatures $searchFeatures)
+    {
+        $this->searchFeatures = $searchFeatures;
+    }
+
+    public function work(Builder $schema, array $args)
+    {
+        $domainGroupName = $this->getNameHelper()->domainGroupName($args['ContentTypeGroup']);
+        $domainContentCollectionField = $this->getNameHelper()->domainContentCollectionField($args['ContentType']);
+        $fieldDefinitionField = $this->getNameHelper()->fieldDefinitionField($args['FieldDefinition']);
+
+        $schema->addFieldToType(
+            $domainGroupName,
+            new Builder\Input\Field(
+                $domainContentCollectionField,
+                $this->getFilterType($args['FieldDefinition']),
+                ['description' => 'Filter content based on the ' . $args['FieldDefinition']->identifier . ' field']
+            )
+        );
+    }
+
+    public function canWork(Builder $schema, array $args)
+    {
+        return
+            isset($args['FieldDefinition'])
+            && $args['FieldDefinition'] instanceof FieldDefinition
+            & isset($args['ContentType'])
+            && $args['ContentType'] instanceof ContentType
+            && $this->searchFeatures->supportsFieldCriterion($args['FieldDefinition']);
+    }
+
+    /**
+     * @param ContentType $contentType
+     * @return string
+     */
+    protected function getDomainContentName(ContentType $contentType): string
+    {
+        return $this->getNameHelper()->domainContentName($contentType);
+    }
+
+    /**
+     * @param FieldDefinition $fieldDefinition
+     * @return string
+     */
+    protected function getFieldDefinitionField(FieldDefinition $fieldDefinition): string
+    {
+        return $this->getNameHelper()->fieldDefinitionField($fieldDefinition);
+    }
+
+    private function isSearchable(FieldDefinition $fieldDefinition): bool
+    {
+        return $fieldDefinition->isSearchable
+            // should only be verified if legacy is the current search engine
+            && $this->converterRegistry->getConverter($fieldDefinition->fieldTypeIdentifier)->getIndexColumn() !== false;
+    }
+
+    private function getFilterType(FieldDefinition $fieldDefinition)
+    {
+        switch ($fieldDefinition->fieldTypeIdentifier)
+        {
+            case 'ezboolean':
+                return 'Boolean';
+            default:
+                return 'String';
+        }
+    }
+}

src/Search/LegacySearchFeatures.php

@@ -0,0 +1,23 @@
+<?php
+namespace EzSystems\EzPlatformGraphQL\Search;
+
+use eZ\Publish\API\Repository\Values\ContentType\FieldDefinition;
+use eZ\Publish\Core\Persistence\Legacy\Content\FieldValue\ConverterRegistry;
+
+class LegacySearchFeatures implements SearchFeatures
+{
+    /**
+     * @var \eZ\Publish\Core\Persistence\Legacy\Content\FieldValue\ConverterRegistry
+     */
+    private $converterRegistry;
+
+    public function __construct(ConverterRegistry $converterRegistry)
+    {
+        $this->converterRegistry = $converterRegistry;
+    }
+
+    public function supportsFieldCriterion(FieldDefinition $fieldDefinition)
+    {
+        return $this->converterRegistry->getConverter($fieldDefinition->fieldTypeIdentifier)->getIndexColumn() !== false;
+    }
+}

src/Search/SearchFeatures.php

@@ -0,0 +1,16 @@
+<?php
+namespace EzSystems\EzPlatformGraphQL\Search;
+
+use eZ\Publish\API\Repository\Values\ContentType\FieldDefinition;
+
+interface SearchFeatures
+{
+    /**
+     * Tests if search supports field filtering on $fieldDefinition.
+     *
+     * @param FieldDefinition $fieldDefinition
+     *
+     * @return bool
+     */
+    public function supportsFieldCriterion(FieldDefinition $fieldDefinition);
+}

src/Search/SolrSearchFeatures.php

@@ -0,0 +1,12 @@
+<?php
+namespace EzSystems\EzPlatformGraphQL\Search;
+
+use eZ\Publish\API\Repository\Values\ContentType\FieldDefinition;
+
+class SolrSearchFeatures implements SearchFeatures
+{
+    public function supportsFieldCriterion(FieldDefinition $fieldDefinition)
+    {
+        return true;
+    }
+}