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<?php |
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|
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if (!defined('ABSPATH')) { |
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exit; |
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} |
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|
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/** |
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* Validates uploaded import files before the importer reads CSV content. |
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*/ |
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class ABJ_404_Solution_ImportUploadValidator { |
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|
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/** |
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* @param array<mixed> $file |
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* @return string Empty on success, error message on failure. |
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*/ |
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function validate(array $file): string { |
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$allowed_extensions = array('csv', 'txt'); |
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$file_ext = strtolower(pathinfo($this->stringField($file, 'name'), PATHINFO_EXTENSION)); |
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if (!in_array($file_ext, $allowed_extensions)) { |
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return __('Error: Invalid file type. Only CSV/TXT files are allowed.', '404-solution'); |
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} |
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|
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$max_file_size = 5 * 1024 * 1024; |
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if ($this->intField($file, 'size') > $max_file_size) { |
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return __('Error: File too large. Maximum size is 5MB.', '404-solution'); |
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} |
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|
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$allowed_mime_types = array('text/csv', 'text/plain', 'application/csv', 'text/comma-separated-values', 'application/vnd.ms-excel'); |
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// DESIGN-AUDIT-OK: the missing finfo_close() is deliberate, not an |
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// oversight. Measured on PHP 8.5.9: 300 validate() calls that never |
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// close the handle grow the process descriptor count by 0, because PHP |
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// refcounts the handle and frees it when $finfo leaves scope. (Positive |
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// control for that measurement: 50 handles held live in an array grew |
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// the count by 50, so the probe can detect growth.) finfo_close() is |
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// deprecated as of PHP 8.5 -- "finfo objects are freed automatically" |
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// -- so calling it would emit a deprecation notice on supported |
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// installs in exchange for fixing nothing. |
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$finfo = finfo_open(FILEINFO_MIME_TYPE); |
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if ($finfo === false) { |
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return __('Error: Unable to determine file type.', '404-solution'); |
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} |
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$mime_type = finfo_file($finfo, $this->tmpName($file)); |
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if (!in_array($mime_type, $allowed_mime_types)) { |
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return __('Error: Invalid file type. Only CSV files are allowed.', '404-solution'); |
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} |
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|
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return ''; |
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} |
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|
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/** |
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* @param array<mixed> $file |
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* @return string |
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*/ |
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function tmpName(array $file): string { |
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return $this->stringField($file, 'tmp_name'); |
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} |
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|
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/** |
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* @param array<mixed> $file |
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* @param string $key |
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* @return string |
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*/ |
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private function stringField(array $file, string $key): string { |
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$value = $file[$key] ?? ''; |
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return is_scalar($value) ? (string)$value : ''; |
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} |
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|
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/** |
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* @param array<mixed> $file |
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* @param string $key |
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* @return int |
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*/ |
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private function intField(array $file, string $key): int { |
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$value = $file[$key] ?? 0; |
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return is_numeric($value) ? (int)$value : 0; |
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} |
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} |
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|
