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HandlerHelperTrait.php
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HandlerHelperTrait.php
65 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Helper trait for MCP handlers. |
| 4 | * |
| 5 | * @package McpAdapter |
| 6 | */ |
| 7 | |
| 8 | declare( strict_types=1 ); |
| 9 | |
| 10 | namespace WP\MCP\Handlers; |
| 11 | |
| 12 | use WP\MCP\Infrastructure\ErrorHandling\Contracts\McpErrorHandlerInterface; |
| 13 | |
| 14 | /** |
| 15 | * Provides common helper methods for MCP handlers. |
| 16 | */ |
| 17 | trait HandlerHelperTrait { |
| 18 | /** |
| 19 | * Extracts parameters from a request message. |
| 20 | * |
| 21 | * Handles both direct params and nested params structure for backward compatibility. |
| 22 | * This normalizes the dual parameter patterns found throughout handlers. |
| 23 | * |
| 24 | * @param array $data Request data that may have params at root or nested. |
| 25 | * |
| 26 | * @return array Extracted parameters. |
| 27 | */ |
| 28 | protected function extract_params( array $data ): array { |
| 29 | return $data['params'] ?? $data; |
| 30 | } |
| 31 | |
| 32 | /** |
| 33 | * Validate that a filtered list value is still an array. |
| 34 | * |
| 35 | * If a filter callback returns a non-array value, logs a warning |
| 36 | * and falls back to the original unfiltered array to prevent |
| 37 | * downstream type errors. |
| 38 | * |
| 39 | * @since 0.5.0 |
| 40 | * |
| 41 | * @param mixed $filtered The value returned by apply_filters. |
| 42 | * @param array $original The original unfiltered array. |
| 43 | * @param string $filter_name The filter hook name (for logging). |
| 44 | * @param \WP\MCP\Infrastructure\ErrorHandling\Contracts\McpErrorHandlerInterface $error_handler The error handler for logging. |
| 45 | * |
| 46 | * @return array The validated array (filtered if valid, original if not). |
| 47 | */ |
| 48 | protected function validate_filtered_list( $filtered, array $original, string $filter_name, McpErrorHandlerInterface $error_handler ): array { |
| 49 | if ( is_array( $filtered ) ) { |
| 50 | return $filtered; |
| 51 | } |
| 52 | |
| 53 | $error_handler->log( |
| 54 | 'Filter returned non-array value, falling back to original list', |
| 55 | array( |
| 56 | 'filter' => $filter_name, |
| 57 | 'returned_type' => gettype( $filtered ), |
| 58 | ), |
| 59 | 'warning' |
| 60 | ); |
| 61 | |
| 62 | return $original; |
| 63 | } |
| 64 | } |
| 65 |