fix: Allow more specific object keys

src/OpenApiType.php

@@ -225,15 +225,16 @@ public static function resolve(string $context, array $definitions, ParamTagValu
 		}
 
 		if ($node instanceof GenericTypeNode && $node->type->name === 'array' && count($node->genericTypes) === 2 && $node->genericTypes[0] instanceof IdentifierTypeNode) {
-			if ($node->genericTypes[0]->name === 'string') {
+			$allowedTypes = ['string', 'lowercase-string', 'non-empty-string', 'non-empty-lowercase-string'];
+			if (in_array($node->genericTypes[0]->name, $allowedTypes, true)) {
 				return new OpenApiType(
 					context: $context,
 					type: 'object',
 					additionalProperties: self::resolve($context . ': additionalProperties', $definitions, $node->genericTypes[1]),
 				);
 			}
 
-			Logger::panic($context, "JSON objects can only be indexed by 'string' but got '" . $node->genericTypes[0]->name . "'");
+			Logger::panic($context, "JSON objects can only be indexed by '" . implode("', '", $allowedTypes) . "' but got '" . $node->genericTypes[0]->name . "'");
 		}
 
 		if ($node instanceof GenericTypeNode && $node->type->name == 'int' && count($node->genericTypes) == 2) {

tests/appinfo/routes.php

@@ -21,6 +21,11 @@
 		['name' => 'Federation#federationByController', 'url' => '/api/{apiVersion}/controller-scope', 'verb' => 'POST', 'requirements' => ['apiVersion' => '(v2)']],
 		['name' => 'Federation#movedToDefaultScope', 'url' => '/api/{apiVersion}/default-scope', 'verb' => 'POST', 'requirements' => ['apiVersion' => '(v2)']],
 
+		['name' => 'ReturnArrays#stringArray', 'url' => '/api/{apiVersion}/return-arrays/string', 'verb' => 'GET', 'requirements' => ['apiVersion' => '(v2)']],
+		['name' => 'ReturnArrays#nonEmptyStringArray', 'url' => '/api/{apiVersion}/return-arrays/non-empty-string', 'verb' => 'GET', 'requirements' => ['apiVersion' => '(v2)']],
+		['name' => 'ReturnArrays#lowercaseStringArray', 'url' => '/api/{apiVersion}/return-arrays/lowercase-string', 'verb' => 'GET', 'requirements' => ['apiVersion' => '(v2)']],
+		['name' => 'ReturnArrays#nonEmptyLowercaseStringArray', 'url' => '/api/{apiVersion}/return-arrays/non-empty-lowercase-string', 'verb' => 'GET', 'requirements' => ['apiVersion' => '(v2)']],
+
 		['name' => 'Settings#ignoreByDeprecatedAttributeOnMethod', 'url' => '/api/{apiVersion}/ignore-openapi-attribute', 'verb' => 'POST', 'requirements' => ['apiVersion' => '(v2)']],
 		['name' => 'Settings#ignoreByScopeOnMethod', 'url' => '/api/{apiVersion}/ignore-method-scope', 'verb' => 'POST', 'requirements' => ['apiVersion' => '(v2)']],
 		['name' => 'Settings#ignoreByUnnamedScopeOnMethod', 'url' => '/api/{apiVersion}/ignore-method-scope-unnamed', 'verb' => 'POST', 'requirements' => ['apiVersion' => '(v2)']],

tests/lib/Controller/ReturnArraysController.php

@@ -0,0 +1,60 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2024 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OCA\Notifications\Controller;
+
+use OCP\AppFramework\Http;
+use OCP\AppFramework\Http\DataResponse;
+use OCP\AppFramework\OCSController;
+
+class ReturnArraysController extends OCSController {
+	/**
+	 * Route with array using string keys
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array<string, mixed>, array{}>
+	 *
+	 * 200: OK
+	 */
+	public function stringArray(): DataResponse {
+		return new DataResponse();
+	}
+
+	/**
+	 * Route with array using non-empty-string keys
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array<non-empty-string, mixed>, array{}>
+	 *
+	 * 200: OK
+	 */
+	public function nonEmptyStringArray(): DataResponse {
+		return new DataResponse();
+	}
+
+	/**
+	 * Route with array using lowercase-string keys
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array<lowercase-string, mixed>, array{}>
+	 *
+	 * 200: OK
+	 */
+	public function lowercaseStringArray(): DataResponse {
+		return new DataResponse();
+	}
+
+	/**
+	 * Route with array using non-empty-lowercase-string keys
+	 *
+	 * @return DataResponse<Http::STATUS_OK, array<non-empty-lowercase-string, mixed>, array{}>
+	 *
+	 * 200: OK
+	 */
+	public function nonEmptyLowercaseStringArray(): DataResponse {
+		return new DataResponse();
+	}
+}