rebase from live enviornment

wp/plugins/contact-form-7/includes/swv/rules/file.php

@@ -0,0 +1,63 @@
+<?php
+
+class WPCF7_SWV_FileRule extends WPCF7_SWV_Rule {
+
+	const rule_name = 'file';
+
+	public function matches( $context ) {
+		if ( false === parent::matches( $context ) ) {
+			return false;
+		}
+
+		if ( empty( $context['file'] ) ) {
+			return false;
+		}
+
+		return true;
+	}
+
+	public function validate( $context ) {
+		$field = $this->get_property( 'field' );
+		$input = isset( $_FILES[$field]['name'] ) ? $_FILES[$field]['name'] : '';
+		$input = wpcf7_array_flatten( $input );
+		$input = wpcf7_exclude_blank( $input );
+
+		$acceptable_filetypes = array();
+
+		foreach ( (array) $this->get_property( 'accept' ) as $accept ) {
+			if ( preg_match( '/^\.[a-z0-9]+$/i', $accept ) ) {
+				$acceptable_filetypes[] = strtolower( $accept );
+			} else {
+				foreach ( wpcf7_convert_mime_to_ext( $accept ) as $ext ) {
+					$acceptable_filetypes[] = sprintf(
+						'.%s',
+						strtolower( trim( $ext, ' .' ) )
+					);
+				}
+			}
+		}
+
+		$acceptable_filetypes = array_unique( $acceptable_filetypes );
+
+		foreach ( $input as $i ) {
+			$last_period_pos = strrpos( $i, '.' );
+
+			if ( false === $last_period_pos ) { // no period
+				return new WP_Error( 'wpcf7_invalid_file',
+					$this->get_property( 'error' )
+				);
+			}
+
+			$suffix = strtolower( substr( $i, $last_period_pos ) );
+
+			if ( ! in_array( $suffix, $acceptable_filetypes, true ) ) {
+				return new WP_Error( 'wpcf7_invalid_file',
+					$this->get_property( 'error' )
+				);
+			}
+		}
+
+		return true;
+	}
+
+}