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<?php
/**
* DLM_Utils
*
* Modified @since 4.5.0
*/
abstract class DLM_Utils {
/**
* Defined tables
*
* @var array $tables An array of defined tables.
*
* @since 4.7.75
*/
private static $tables = array();
/**
* Get visitor's IP address
*
* @return string
*/
public static function get_visitor_ip() {
// Fix for CloudFlare IPs
$ip = '';
if ( isset( $_SERVER['REMOTE_ADDR'] ) ){
$ip = sanitize_text_field( wp_unslash( $_SERVER['REMOTE_ADDR'] ) );
}
if ( isset( $_SERVER["HTTP_X_REAL_IP"] ) ) {
$ip = sanitize_text_field( wp_unslash( $_SERVER["HTTP_X_REAL_IP"] ) );
}
if ( isset( $_SERVER["HTTP_CF_CONNECTING_IP"] ) ) {
$ip = sanitize_text_field( wp_unslash( $_SERVER["HTTP_CF_CONNECTING_IP"] ) );
}
if ( WP_DLM::dlm_proxy_ip_override() && ! empty( $_SERVER['HTTP_X_FORWARDED_FOR'] ) ) {
// phpcs:ignore
$parts = explode( ",", $_SERVER['HTTP_X_FORWARDED_FOR'] );
$ip = trim( array_shift( $parts ) );
}
return sanitize_text_field( $ip );
}
/**
* Get visitor's user agent
*
* @return string
*/
public static function get_visitor_ua() {
$ua = isset( $_SERVER['HTTP_USER_AGENT'] ) ? sanitize_text_field( wp_unslash( $_SERVER['HTTP_USER_AGENT'] ) ) : '' ;
if ( strlen( $ua ) > 200 ) {
$ua = substr( $ua, 0, 199 );
}
return $ua;
}
/**
* Check if a given ip is in a network (IPv4)
* https://gist.github.com/tott/7684443
*
* @param string $ip IP to check in IPv4 format eg. 127.0.0.1
* @param string $range IP/CIDR netmask eg. 127.0.0.0/24, also 127.0.0.1 is accepted and /32 assumed
* @return boolean true if the ip is in this range / false if not.
*/
public static function ipv4_in_range( $ip, $range ) {
if ( strpos( $range, '/' ) == false ) {
$range .= '/32';
}
list( $range, $netmask ) = explode( '/', $range, 2 );
$range_decimal = ip2long( $range );
$ip_decimal = ip2long( $ip );
$wildcard_decimal = pow( 2, ( 32 - $netmask ) ) - 1;
$netmask_decimal = ~ $wildcard_decimal;
return ( ( $ip_decimal & $netmask_decimal ) == ( $range_decimal & $netmask_decimal ) );
}
/**
* Helper function for ipv6_in_range()
* Converts inet_pton output to string with bits
*/
private static function inet_to_bits( $inet ) {
$unpacked = unpack( 'A16', $inet );
$unpacked = str_split( $unpacked[1] );
$binaryip = '';
foreach ( $unpacked as $char ) {
$binaryip .= str_pad( decbin( ord( $char ) ), 8, '0', STR_PAD_LEFT );
}
return $binaryip;
}
/**
* Check if a given ip is in a network (IPv6)
* http://stackoverflow.com/questions/7951061/matching-ipv6-address-to-a-cidr-subnet
*
* @param string $ip IP to check in IPv6 format eg. 2001:db8::1
* @param string $range IP/CIDR netmask eg. 2001:db8::/32, also 2001:db8::1 is accepted and /128 assumed
* @return boolean true if the ip is in this range / false if not.
*/
public static function ipv6_in_range( $ip, $range ) {
// Windows didn't get inet_pton until PHP 5.3.0
if ( ! function_exists( 'inet_pton' ) ) {
return false;
}
if ( strpos( $range, '/' ) == false ) {
$range .= '/128';
}
$ip = inet_pton( $ip );
$binaryip = self::inet_to_bits( $ip );
list( $net, $maskbits ) = explode( '/', $range, 3 );
$net = inet_pton( $net );
$binarynet = self::inet_to_bits( $net );
$ip_net_bits = substr( $binaryip, 0, $maskbits );
$net_bits = substr( $binarynet, 0, $maskbits );
return ( $ip_net_bits === $net_bits );
}
/**
* Local independent basename
*
* @param string $filepath
*
* @return string
*/
public static function basename( $filepath ) {
return preg_replace( '/^.+[\\\\\\/]/', '', $filepath );
}
/**
* Retrieves the longes common substring from a list of strings
*
* @param array $file_paths
*
* @return string Longest common substring
* @since 4.5.92
*/
public static function longest_common_path( $file_paths ) {
$paths = array();
for ( $i = 0; $i < count( $file_paths ); $i++ ) {
$paths[ $i ] = explode( DIRECTORY_SEPARATOR, $file_paths[ $i ] );
}
array_multisort( array_map( 'count', $paths ), SORT_ASC, $paths );
$count = min( array_map( 'count', $paths ) );
$common_parts = array();
// If there is only 1 path it means it is a standard WordPress installation, so return standard ABSPATH path
if ( 1 === count( $file_paths ) ) {
return $file_paths[0];
}
// The other 2 scenarios we have are with 2 or 3 paths, where the WP_CONTENT_DIR and ABPSPATH have different paths
// Plus the scenario where the user has included another path for the downloads
for ( $i = 0; $i < $count; $i++ ) {
if ( $paths[0][ $i ] === $paths[1][ $i ] ) {
$common_parts[] = $paths[0][ $i ];
} else {
break;
}
}
if ( isset( $paths[2] ) ) {
$new_path = implode( DIRECTORY_SEPARATOR, $common_parts );
$last_file_path = implode( DIRECTORY_SEPARATOR, $paths[2] );
if ( ! empty( $new_path ) && false !== strpos( $last_file_path, $new_path ) ) {
return $new_path;
} else {
$max = count( $common_parts );
for ( $i = $max - 1; $i > 0; $i-- ) {
if ( $common_parts[ $i ] !== $paths[2][ $i ] ) {
unset( $common_parts[ $i ] );
} else {
break;
}
}
}
}
return implode( DIRECTORY_SEPARATOR, $common_parts );
}
/**
*Check for existing table
*
* @param string $table The table we are checking.
*
* @return bool
*/
public static function table_checker( $table ) {
if ( empty( self::$tables ) || ! in_array( $table, self::$tables ) ) {
global $wpdb;
// If exists, return true.
if ( $wpdb->get_var( $wpdb->prepare( 'SHOW TABLES LIKE %s', $table ) ) ) {
self::$tables[] = $table;
return true;
}
// Doesn't exist, return false.
return false;
}
// Exists in variable, return true.
return true;
}
/**
* Check for existing column inside a table
*
* @param string $table_name The table in witch we are checking.
*
* @param string $col_name The column we are checking for.
*
* @return bool
*/
public static function column_checker( $table_name, $col_name ) {
global $wpdb;
$diffs = 0;
$results = $wpdb->get_results( "DESC $table_name" );
foreach ( $results as $row ) {
if ( $row->Field === $col_name ) {
return true;
} // End if found our column.
}
return false;
}
/*
*
* Generate html attributes based on array
*
* @param array $attributes Array of attributes to generate
*
* @return string
* @since 4.6.0
*
*/
public static function generate_attributes( $attributes ) {
$return = '';
// Let's unset the inner_html attribute so that it doesn't end up in our attributes
if ( isset( $attributes['inner_html'] ) ) {
unset( $attributes['inner_html'] );
}
foreach ( $attributes as $name => $value ) {
if ( is_array( $value ) && 'class' == $name ) {
$value = implode( ' ', $value );
} elseif ( is_array( $value ) ) {
$value = json_encode( $value );
}
if ( in_array( $name, array( 'alt', 'rel', 'title' ) ) ) {
$value = str_replace( '<script', '<script', $value );
$value = strip_tags( htmlspecialchars( $value ) );
$value = preg_replace( '@<(script|style)[^>]*?>.*?</\\1>@si', '', $value );
}
$return .= ' ' . esc_attr( $name ) . '="' . esc_attr( $value ) . '"';
}
return $return;
}
/**
* Get visitor UUID
*
* @return string
* @since 4.6.0
*/
public static function get_visitor_uuid() {
return md5( self::get_visitor_ip() );
}
/**
* Fix for WPML setting language for download links. IF the downloads are made trasnlatable this will need to be deleted.
*
* @param string $home_url Home URL made by WPML.
* @param string $url Original URL.
*
* @return string $home_url The correct home URL for Download Monitor.
*/
public static function wpml_download_link( $home_url, $url ) {
return $url;
}
/**
* Prevent duplicate downloads/logs
*
* @return bool
*
* @since 4.9.6
*/
public static function no_duplicate_download(): bool {
/**
* Filter to disable the no duplicate download feature
*
* @hook dlm_no_duplicate_download
*
* @since 4.9.4
*/
return apply_filters( 'dlm_no_duplicate_download', 'production' === wp_get_environment_type() );
}
}