' . __( 'To use CAPTCHA, you need Really Simple CAPTCHA plugin installed.', 'wpcf7' ) . ''; } $op = array(); // Default $op['img_size'] = array( 72, 24 ); $op['base'] = array( 6, 18 ); $op['font_size'] = 14; $op['font_char_width'] = 15; $op = array_merge( $op, wpcf7_captchac_options( $options ) ); if ( ! $filename = wpcf7_generate_captcha( $op ) ) return ''; if ( is_array( $op['img_size'] ) ) $atts .= ' width="' . $op['img_size'][0] . '" height="' . $op['img_size'][1] . '"'; $captcha_url = trailingslashit( wpcf7_captcha_tmp_url() ) . $filename; $html = 'captcha'; $ref = substr( $filename, 0, strrpos( $filename, '.' ) ); $html = '' . $html; return $html; } elseif ( 'captchar' == $type ) { if ( $size_att ) $atts .= ' size="' . $size_att . '"'; else $atts .= ' size="40"'; // default size if ( $maxlength_att ) $atts .= ' maxlength="' . $maxlength_att . '"'; if ( '' !== $tabindex_att ) $atts .= sprintf( ' tabindex="%d"', $tabindex_att ); if ( '' !== $title_att ) $atts .= sprintf( ' title="%s"', trim( esc_attr( $title_att ) ) ); $html = ''; $html = '' . $html . $validation_error . ''; return $html; } } /* Validation filter */ add_filter( 'wpcf7_validate_captchar', 'wpcf7_captcha_validation_filter', 10, 2 ); function wpcf7_captcha_validation_filter( $result, $tag ) { $type = $tag['type']; $name = $tag['name']; $_POST[$name] = (string) $_POST[$name]; $captchac = '_wpcf7_captcha_challenge_' . $name; if ( ! wpcf7_check_captcha( $_POST[$captchac], $_POST[$name] ) ) { $result['valid'] = false; $result['reason'][$name] = wpcf7_get_message( 'captcha_not_match' ); } wpcf7_remove_captcha( $_POST[$captchac] ); return $result; } /* Ajax echo filter */ add_filter( 'wpcf7_ajax_onload', 'wpcf7_captcha_ajax_refill' ); add_filter( 'wpcf7_ajax_json_echo', 'wpcf7_captcha_ajax_refill' ); function wpcf7_captcha_ajax_refill( $items ) { if ( ! is_array( $items ) ) return $items; $fes = wpcf7_scan_shortcode( array( 'type' => 'captchac' ) ); if ( empty( $fes ) ) return $items; $refill = array(); foreach ( $fes as $fe ) { $name = $fe['name']; $options = $fe['options']; if ( empty( $name ) ) continue; $op = wpcf7_captchac_options( $options ); if ( $filename = wpcf7_generate_captcha( $op ) ) { $captcha_url = trailingslashit( wpcf7_captcha_tmp_url() ) . $filename; $refill[$name] = $captcha_url; } } if ( ! empty( $refill ) ) $items['captcha'] = $refill; return $items; } /* Messages */ add_filter( 'wpcf7_messages', 'wpcf7_captcha_messages' ); function wpcf7_captcha_messages( $messages ) { return array_merge( $messages, array( 'captcha_not_match' => array( 'description' => __( "The code that sender entered does not match the CAPTCHA", 'wpcf7' ), 'default' => __( 'Your entered code is incorrect.', 'wpcf7' ) ) ) ); } /* Tag generator */ add_action( 'admin_init', 'wpcf7_add_tag_generator_captcha', 45 ); function wpcf7_add_tag_generator_captcha() { wpcf7_add_tag_generator( 'captcha', __( 'CAPTCHA', 'wpcf7' ), 'wpcf7-tg-pane-captcha', 'wpcf7_tg_pane_captcha' ); } function wpcf7_tg_pane_captcha( &$contact_form ) { ?> form_scan_shortcode( array( 'type' => array( 'captchac' ) ) ); if ( ! $has_tags ) return; if ( ! class_exists( 'ReallySimpleCaptcha' ) ) return; $uploads_dir = wpcf7_captcha_tmp_dir(); wpcf7_init_captcha(); if ( ! is_dir( $uploads_dir ) || ! is_writable( $uploads_dir ) ) { $message = sprintf( __( 'This contact form contains CAPTCHA fields, but the temporary folder for the files (%s) does not exist or is not writable. You can create the folder or change its permission manually.', 'wpcf7' ), $uploads_dir ); echo '

' . esc_html( $message ) . '

'; } if ( ! function_exists( 'imagecreatetruecolor' ) || ! function_exists( 'imagettftext' ) ) { $message = __( 'This contact form contains CAPTCHA fields, but the necessary libraries (GD and FreeType) are not available on your server.', 'wpcf7' ); echo '

' . esc_html( $message ) . '

'; } } /* CAPTCHA functions */ function wpcf7_init_captcha() { global $wpcf7_captcha; if ( ! class_exists( 'ReallySimpleCaptcha' ) ) return false; if ( ! is_object( $wpcf7_captcha ) ) $wpcf7_captcha = new ReallySimpleCaptcha(); $captcha =& $wpcf7_captcha; $captcha->tmp_dir = trailingslashit( wpcf7_captcha_tmp_dir() ); wp_mkdir_p( $captcha->tmp_dir ); return true; } function wpcf7_captcha_tmp_dir() { if ( defined( 'WPCF7_CAPTCHA_TMP_DIR' ) ) return WPCF7_CAPTCHA_TMP_DIR; else return wpcf7_upload_dir( 'dir' ) . '/wpcf7_captcha'; } function wpcf7_captcha_tmp_url() { if ( defined( 'WPCF7_CAPTCHA_TMP_URL' ) ) return WPCF7_CAPTCHA_TMP_URL; else return wpcf7_upload_dir( 'url' ) . '/wpcf7_captcha'; } function wpcf7_generate_captcha( $options = null ) { global $wpcf7_captcha; if ( ! wpcf7_init_captcha() ) return false; $captcha =& $wpcf7_captcha; if ( ! is_dir( $captcha->tmp_dir ) || ! is_writable( $captcha->tmp_dir ) ) return false; $img_type = imagetypes(); if ( $img_type & IMG_PNG ) $captcha->img_type = 'png'; elseif ( $img_type & IMG_GIF ) $captcha->img_type = 'gif'; elseif ( $img_type & IMG_JPG ) $captcha->img_type = 'jpeg'; else return false; if ( is_array( $options ) ) { if ( isset( $options['img_size'] ) ) $captcha->img_size = $options['img_size']; if ( isset( $options['base'] ) ) $captcha->base = $options['base']; if ( isset( $options['font_size'] ) ) $captcha->font_size = $options['font_size']; if ( isset( $options['font_char_width'] ) ) $captcha->font_char_width = $options['font_char_width']; if ( isset( $options['fg'] ) ) $captcha->fg = $options['fg']; if ( isset( $options['bg'] ) ) $captcha->bg = $options['bg']; } $prefix = mt_rand(); $captcha_word = $captcha->generate_random_word(); return $captcha->generate_image( $prefix, $captcha_word ); } function wpcf7_check_captcha( $prefix, $response ) { global $wpcf7_captcha; if ( ! wpcf7_init_captcha() ) return false; $captcha =& $wpcf7_captcha; return $captcha->check( $prefix, $response ); } function wpcf7_remove_captcha( $prefix ) { global $wpcf7_captcha; if ( ! wpcf7_init_captcha() ) return false; $captcha =& $wpcf7_captcha; if ( preg_match( '/[^0-9]/', $prefix ) ) // Contact Form 7 generates $prefix with mt_rand() return false; $captcha->remove( $prefix ); } function wpcf7_cleanup_captcha_files() { global $wpcf7_captcha; if ( ! wpcf7_init_captcha() ) return false; $captcha =& $wpcf7_captcha; if ( is_callable( array( $captcha, 'cleanup' ) ) ) return $captcha->cleanup(); $dir = trailingslashit( wpcf7_captcha_tmp_dir() ); if ( ! is_dir( $dir ) || ! is_readable( $dir ) || ! is_writable( $dir ) ) return false; if ( $handle = @opendir( $dir ) ) { while ( false !== ( $file = readdir( $handle ) ) ) { if ( ! preg_match( '/^[0-9]+\.(php|png|gif|jpeg)$/', $file ) ) continue; $stat = @stat( $dir . $file ); if ( $stat['mtime'] + 3600 < time() ) // 3600 secs == 1 hour @unlink( $dir . $file ); } closedir( $handle ); } } if ( ! is_admin() && 'GET' == $_SERVER['REQUEST_METHOD'] ) wpcf7_cleanup_captcha_files(); function wpcf7_captchac_options( $options ) { if ( ! is_array( $options ) ) return array(); $op = array(); $image_size_array = preg_grep( '%^size:[smlSML]$%', $options ); if ( $image_size = array_shift( $image_size_array ) ) { preg_match( '%^size:([smlSML])$%', $image_size, $is_matches ); switch ( strtolower( $is_matches[1] ) ) { case 's': $op['img_size'] = array( 60, 20 ); $op['base'] = array( 6, 15 ); $op['font_size'] = 11; $op['font_char_width'] = 13; break; case 'l': $op['img_size'] = array( 84, 28 ); $op['base'] = array( 6, 20 ); $op['font_size'] = 17; $op['font_char_width'] = 19; break; case 'm': default: $op['img_size'] = array( 72, 24 ); $op['base'] = array( 6, 18 ); $op['font_size'] = 14; $op['font_char_width'] = 15; } } $fg_color_array = preg_grep( '%^fg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $options ); if ( $fg_color = array_shift( $fg_color_array ) ) { preg_match( '%^fg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $fg_color, $fc_matches ); if ( 3 == strlen( $fc_matches[1] ) ) { $r = substr( $fc_matches[1], 0, 1 ); $g = substr( $fc_matches[1], 1, 1 ); $b = substr( $fc_matches[1], 2, 1 ); $op['fg'] = array( hexdec( $r . $r ), hexdec( $g . $g ), hexdec( $b . $b ) ); } elseif ( 6 == strlen( $fc_matches[1] ) ) { $r = substr( $fc_matches[1], 0, 2 ); $g = substr( $fc_matches[1], 2, 2 ); $b = substr( $fc_matches[1], 4, 2 ); $op['fg'] = array( hexdec( $r ), hexdec( $g ), hexdec( $b ) ); } } $bg_color_array = preg_grep( '%^bg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $options ); if ( $bg_color = array_shift( $bg_color_array ) ) { preg_match( '%^bg:#([0-9a-fA-F]{3}|[0-9a-fA-F]{6})$%', $bg_color, $bc_matches ); if ( 3 == strlen( $bc_matches[1] ) ) { $r = substr( $bc_matches[1], 0, 1 ); $g = substr( $bc_matches[1], 1, 1 ); $b = substr( $bc_matches[1], 2, 1 ); $op['bg'] = array( hexdec( $r . $r ), hexdec( $g . $g ), hexdec( $b . $b ) ); } elseif ( 6 == strlen( $bc_matches[1] ) ) { $r = substr( $bc_matches[1], 0, 2 ); $g = substr( $bc_matches[1], 2, 2 ); $b = substr( $bc_matches[1], 4, 2 ); $op['bg'] = array( hexdec( $r ), hexdec( $g ), hexdec( $b ) ); } } return $op; } $wpcf7_captcha = null; ?>