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<?php |
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namespace Mbright\Validation\Rule\Validate; |
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class Upload implements ValidateRuleInterface |
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{ |
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/** |
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* Validates that the value is an array of file-upload information, and if a file is referred to, that is actually |
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* an uploaded file. |
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* |
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* The required keys are 'error', 'name', 'size', 'tmp_name', 'type'. More or fewer or different keys than this will |
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* return a "malformed" error. |
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* |
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* @param object $subject The subject to be filtered. |
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* @param string $field The subject field name. |
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* |
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* @return bool True if valid, false if not. |
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*/ |
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public function __invoke($subject, string $field): bool |
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{ |
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$value = $subject->$field; |
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$wellFormed = $this->preCheck($value); |
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if (!$wellFormed) { |
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return false; |
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} |
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// was the upload explicitly ok? |
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$err = $value['error']; |
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if ($err != UPLOAD_ERR_OK) { |
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return false; |
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} |
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// is it actually an uploaded file? |
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if (!$this->isUploadedFile($value['tmp_name'])) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Check that the file-upload array is well-formed. |
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* |
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* @param array $value The file-upload array. |
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* |
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* @return bool |
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*/ |
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protected function preCheck(&$value) |
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{ |
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if (!is_array($value)) { |
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return false; |
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} |
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// presorted list of expected keys |
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$expect = ['error', 'name', 'size', 'tmp_name', 'type']; |
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// remove unexpected keys |
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foreach ($value as $key => $val) { |
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if (!in_array($key, $expect)) { |
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unset($value[$key]); |
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} |
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} |
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$actual = array_keys($value); |
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sort($actual); |
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if ($expect != $actual) { |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Check whether the file was uploaded via HTTP POST. |
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* |
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* @param string $file The file to check. |
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* |
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* @return bool True if the file was uploaded via HTTP POST, false if not. |
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*/ |
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protected function isUploadedFile($file) |
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{ |
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return is_uploaded_file($file); |
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} |
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} |
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MarcusFulbright /
Validate
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