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<?php /** ** A base module for [captchac] and [captchar] **/ /* form_tag handler */ add_action( 'wpcf7_init', 'wpcf7_add_form_tag_captcha', 10, 0 ); function wpcf7_add_form_tag_captcha() { // CAPTCHA-Challenge (image) wpcf7_add_form_tag( 'captchac', 'wpcf7_captchac_form_tag_handler', array( 'name-attr' => true, 'zero-controls-container' => true, 'not-for-mail' => true, ) ); // CAPTCHA-Response (input) wpcf7_add_form_tag( 'captchar', 'wpcf7_captchar_form_tag_handler', array( 'name-attr' => true, 'do-not-store' => true, 'not-for-mail' => true, ) ); } function wpcf7_captchac_form_tag_handler( $tag ) { if ( ! class_exists( 'ReallySimpleCaptcha' ) ) { $error = sprintf( /* translators: %s: link labeled 'Really Simple CAPTCHA' */ esc_html( __( "To use CAPTCHA, you need %s plugin installed.", 'contact-form-7' ) ), wpcf7_link( 'https://wordpress.org/plugins/really-simple-captcha/', 'Really Simple CAPTCHA' ) ); return sprintf( '<em>%s</em>', $error ); } if ( empty( $tag->name ) ) { return ''; } $class = wpcf7_form_controls_class( $tag->type ); $class .= ' wpcf7-captcha-' . str_replace( ':', '', $tag->name ); $atts = array(); $atts['class'] = $tag->get_class_option( $class ); $atts['id'] = $tag->get_id_option(); $op = array( // Default 'img_size' => array( 72, 24 ), 'base' => array( 6, 18 ), 'font_size' => 14, 'font_char_width' => 15, ); $op = array_merge( $op, wpcf7_captchac_options( $tag->options ) ); if ( ! $filename = wpcf7_generate_captcha( $op ) ) { return ''; } if ( ! empty( $op['img_size'] ) ) { if ( isset( $op['img_size'][0] ) ) { $atts['width'] = $op['img_size'][0]; } if ( isset( $op['img_size'][1] ) ) { $atts['height'] = $op['img_size'][1]; } } $atts['alt'] = 'captcha'; $atts['src'] = wpcf7_captcha_url( $filename ); $atts = wpcf7_format_atts( $atts ); $prefix = substr( $filename, 0, strrpos( $filename, '.' ) ); $html = sprintf( '<input type="hidden" name="%1$s" value="%2$s" /><img %3$s />', esc_attr( sprintf( '_wpcf7_captcha_challenge_%s', $tag->name ) ), esc_attr( $prefix ), $atts ); return $html; } function wpcf7_captchar_form_tag_handler( $tag ) { if ( empty( $tag->name ) ) { return ''; } $validation_error = wpcf7_get_validation_error( $tag->name ); $class = wpcf7_form_controls_class( $tag->type ); if ( $validation_error ) { $class .= ' wpcf7-not-valid'; } $atts = array(); $atts['size'] = $tag->get_size_option( '40' ); $atts['maxlength'] = $tag->get_maxlength_option(); $atts['minlength'] = $tag->get_minlength_option(); if ( $atts['maxlength'] and $atts['minlength'] and $atts['maxlength'] < $atts['minlength'] ) { unset( $atts['maxlength'], $atts['minlength'] ); } $atts['class'] = $tag->get_class_option( $class ); $atts['id'] = $tag->get_id_option(); $atts['tabindex'] = $tag->get_option( 'tabindex', 'signed_int', true ); $atts['autocomplete'] = 'off'; if ( $validation_error ) { $atts['aria-invalid'] = 'true'; $atts['aria-describedby'] = wpcf7_get_validation_error_reference( $tag->name ); } else { $atts['aria-invalid'] = 'false'; } $value = (string) reset( $tag->values ); if ( wpcf7_is_posted() ) { $value = ''; } if ( $tag->has_option( 'placeholder' ) or $tag->has_option( 'watermark' ) ) { $atts['placeholder'] = $value; $value = ''; } $atts['value'] = $value; $atts['type'] = 'text'; $atts['name'] = $tag->name; $html = sprintf( '<span class="wpcf7-form-control-wrap" data-name="%1$s"><input %2$s />%3$s</span>', esc_attr( $tag->name ), wpcf7_format_atts( $atts ), $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; $captchac = '_wpcf7_captcha_challenge_' . $name; $prefix = (string) ( $_POST[$captchac] ?? '' ); $response = (string) ( $_POST[$name] ?? '' ); $response = wpcf7_canonicalize( $response ); if ( 0 === strlen( $prefix ) or ! wpcf7_check_captcha( $prefix, $response ) ) { $result->invalidate( $tag, wpcf7_get_message( 'captcha_not_match' ) ); } if ( 0 !== strlen( $prefix ) ) { wpcf7_remove_captcha( $prefix ); } return $result; } /* Ajax echo filter */ add_filter( 'wpcf7_refill_response', 'wpcf7_captcha_ajax_refill', 10, 1 ); add_filter( 'wpcf7_feedback_response', 'wpcf7_captcha_ajax_refill', 10, 1 ); function wpcf7_captcha_ajax_refill( $items ) { if ( ! is_array( $items ) ) { return $items; } $tags = wpcf7_scan_form_tags( array( 'type' => 'captchac' ) ); if ( empty( $tags ) ) { return $items; } $refill = array(); foreach ( $tags as $tag ) { $name = $tag->name; $options = $tag->options; if ( empty( $name ) ) { continue; } $op = wpcf7_captchac_options( $options ); if ( $filename = wpcf7_generate_captcha( $op ) ) { $captcha_url = wpcf7_captcha_url( $filename ); $refill[$name] = $captcha_url; } } if ( ! empty( $refill ) ) { $items['captcha'] = $refill; } return $items; } /* Messages */ add_filter( 'wpcf7_messages', 'wpcf7_captcha_messages', 10, 1 ); function wpcf7_captcha_messages( $messages ) { $messages = array_merge( $messages, array( 'captcha_not_match' => array( 'description' => __( "The code that sender entered does not match the CAPTCHA", 'contact-form-7' ), 'default' => __( 'Your entered code is incorrect.', 'contact-form-7' ), ), ) ); return $messages; } /* Warning message */ add_action( 'wpcf7_admin_warnings', 'wpcf7_captcha_display_warning_message', 10, 3 ); function wpcf7_captcha_display_warning_message( $page, $action, $object ) { if ( $object instanceof WPCF7_ContactForm ) { $contact_form = $object; } else { return; } $has_tags = (bool) $contact_form->scan_form_tags( 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 ) or ! wp_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.', 'contact-form-7' ), $uploads_dir ); wp_admin_notice( esc_html( $message ), 'type=warning' ); } if ( ! function_exists( 'imagecreatetruecolor' ) or ! function_exists( 'imagettftext' ) ) { $message = __( "This contact form contains CAPTCHA fields, but the necessary libraries (GD and FreeType) are not available on your server.", 'contact-form-7' ); wp_admin_notice( esc_html( $message ), 'type=warning' ); } } /* CAPTCHA functions */ function wpcf7_init_captcha() { static $captcha = null; if ( $captcha ) { return $captcha; } if ( class_exists( 'ReallySimpleCaptcha' ) ) { $captcha = new ReallySimpleCaptcha(); } else { return false; } $dir = trailingslashit( wpcf7_captcha_tmp_dir() ); $captcha->tmp_dir = $dir; if ( is_callable( array( $captcha, 'make_tmp_dir' ) ) ) { $result = $captcha->make_tmp_dir(); if ( ! $result ) { return false; } return $captcha; } $result = wp_mkdir_p( $dir ); if ( ! $result ) { return false; } $htaccess_file = path_join( $dir, '.htaccess' ); if ( file_exists( $htaccess_file ) ) { list( $first_line_comment ) = (array) file( $htaccess_file, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES ); if ( '# Apache 2.4+' === $first_line_comment ) { return $captcha; } } if ( $handle = @fopen( $htaccess_file, 'w' ) ) { fwrite( $handle, "# Apache 2.4+\n" ); fwrite( $handle, "<IfModule authz_core_module>\n" ); fwrite( $handle, " Require all denied\n" ); fwrite( $handle, ' <FilesMatch "^\w+\.(jpe?g|gif|png)$">' . "\n" ); fwrite( $handle, " Require all granted\n" ); fwrite( $handle, " </FilesMatch>\n" ); fwrite( $handle, "</IfModule>\n" ); fwrite( $handle, "\n" ); fwrite( $handle, "# Apache 2.2\n" ); fwrite( $handle, "<IfModule !authz_core_module>\n" ); fwrite( $handle, " Order deny,allow\n" ); fwrite( $handle, " Deny from all\n" ); fwrite( $handle, ' <FilesMatch "^\w+\.(jpe?g|gif|png)$">' . "\n" ); fwrite( $handle, " Allow from all\n" ); fwrite( $handle, " </FilesMatch>\n" ); fwrite( $handle, "</IfModule>\n" ); fclose( $handle ); } return $captcha; } /** * Returns the directory path for Really Simple CAPTCHA files. * * @return string Directory path. */ function wpcf7_captcha_tmp_dir() { if ( defined( 'WPCF7_CAPTCHA_TMP_DIR' ) ) { $dir = path_join( WP_CONTENT_DIR, WPCF7_CAPTCHA_TMP_DIR ); wp_mkdir_p( $dir ); if ( wpcf7_is_file_path_in_content_dir( $dir ) ) { return $dir; } } $dir = path_join( wpcf7_upload_dir( 'dir' ), 'wpcf7_captcha' ); wp_mkdir_p( $dir ); return $dir; } function wpcf7_captcha_tmp_url() { if ( defined( 'WPCF7_CAPTCHA_TMP_URL' ) ) { return WPCF7_CAPTCHA_TMP_URL; } else { return path_join( wpcf7_upload_dir( 'url' ), 'wpcf7_captcha' ); } } function wpcf7_captcha_url( $filename ) { $url = path_join( wpcf7_captcha_tmp_url(), $filename ); if ( is_ssl() and 'http:' == substr( $url, 0, 5 ) ) { $url = 'https:' . substr( $url, 5 ); } return apply_filters( 'wpcf7_captcha_url', sanitize_url( $url ) ); } function wpcf7_generate_captcha( $options = null ) { if ( ! $captcha = wpcf7_init_captcha() ) { return false; } if ( ! is_dir( $captcha->tmp_dir ) or ! wp_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 = wp_rand(); $captcha_word = $captcha->generate_random_word(); return $captcha->generate_image( $prefix, $captcha_word ); } function wpcf7_check_captcha( $prefix, $response ) { if ( ! $captcha = wpcf7_init_captcha() ) { return false; } return $captcha->check( $prefix, $response ); } function wpcf7_remove_captcha( $prefix ) { if ( ! $captcha = wpcf7_init_captcha() ) { return false; } // Contact Form 7 generates $prefix with wp_rand() if ( preg_match( '/[^0-9]/', $prefix ) ) { return false; } $captcha->remove( $prefix ); } add_action( 'shutdown', 'wpcf7_cleanup_captcha_files', 20, 0 ); function wpcf7_cleanup_captcha_files() { if ( ! $captcha = wpcf7_init_captcha() ) { return false; } if ( is_callable( array( $captcha, 'cleanup' ) ) ) { return $captcha->cleanup(); } $dir = trailingslashit( wpcf7_captcha_tmp_dir() ); if ( ! is_dir( $dir ) or ! is_readable( $dir ) or ! wp_is_writable( $dir ) ) { return false; } if ( $handle = opendir( $dir ) ) { while ( false !== ( $file = readdir( $handle ) ) ) { if ( ! preg_match( '/^[0-9]+\.(php|txt|png|gif|jpeg)$/', $file ) ) { continue; } $stat = stat( path_join( $dir, $file ) ); if ( $stat['mtime'] + HOUR_IN_SECONDS < time() ) { @unlink( path_join( $dir, $file ) ); } } closedir( $handle ); } } 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; }
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