<?php

if (!defined('ABSPATH')) die('No direct access.');

/**
 * Here live manipulation functions that just transform input into output and do not perform any other activities
 */
class UpdraftPlus_Manipulation_Functions {

	/**
	 * Replace last occurrence
	 *
	 * @param  String  $search         The value being searched for, otherwise known as the needle
	 * @param  String  $replace        The replacement value that replaces found search values
	 * @param  String  $subject        The string or array being searched and replaced on, otherwise known as the haystack
	 * @param  Boolean $case_sensitive Whether the replacement should be case sensitive or not
	 *
	 * @return String
	 */
	public static function str_lreplace($search, $replace, $subject, $case_sensitive = true) {
		$pos = $case_sensitive ? strrpos($subject, $search) : strripos($subject, $search);
		if (false !== $pos) $subject = substr_replace($subject, $replace, $pos, strlen($search));
		return $subject;
	}
	
	/**
	 * Replace the first, and only the first, instance within a string
	 *
	 * @param String $needle   - the search term
	 * @param String $replace  - the replacement term
	 * @param String $haystack - the string to replace within
	 *
	 * @return String - the filtered string
	 */
	public static function str_replace_once($needle, $replace, $haystack) {
		$pos = strpos($haystack, $needle);
		return (false !== $pos) ? substr_replace($haystack, $replace, $pos, strlen($needle)) : $haystack;
	}

	/**
	 * Remove slashes that precede a comma or the end of the string
	 *
	 * @param String $string - input string
	 *
	 * @return String - the altered string
	 */
	public static function strip_dirslash($string) {
		return preg_replace('#/+(,|$)#', '$1', $string);
	}

	/**
	 * Remove slashes from a string or array of strings.
	 *
	 * The function wp_unslash() is WP 3.6+, so therefore we have a compatibility method here
	 *
	 * @param String|Array $value         String or array of strings to unslash.
	 * @param Boolean      $force_unslash Strip slashes without checking whether wp_magic_quotes function and/or plugins_loaded action have already been called or not
	 * @return String|Array Unslashed $value
	 */
	public static function wp_unslash($value, $force_unslash = true) {
		if (!$force_unslash && (!did_action('plugins_loaded') || !isset($GLOBALS['wp_the_query']))) return $value;
		return function_exists('wp_unslash') ? wp_unslash($value) : stripslashes_deep($value);
	}

	/**
	 * Return the value of a member of a superglobal, after slash-stripping and sanitisation.
	 *
	 * When using, it is recommended that if the $type or $sanitisation parameters are not used then a code comment is added to state the reason.
	 *
	 * @param String        $superglobal  - Should be one of 'get', 'post', 'request' or 'cookie'
	 * @param String        $key          - The key to fetch from the superglobal array
	 * @param Mixed         $default      - Value to return if the key is not found or if the value is invalid
	 * @param Boolean       $auto_unslash - Whether to automatically strip slashes from the variable value but not to force it
	 * @param String|Null   $type         - If specified, then this must (modulo case) match what is returned by gettype() upon the returned value; otherwise, $default will be used. If it is not possible to return a value of the correct type (e.g. if $default itself is not of the correct type) then a TypeError will be thrown. This can be useful if the caller wishes to distinguish between the fetched value being equal to the default, and being invalid (the caller can catch the TypeError to detect this).
	 * @param Callable|Null $sanitisation - The sanitisation function to run the result through (any function), with the first parameter being the putative value. Any $default value will not be sanitised, which allows different cases to be distinguished as described above.
	 *
	 * @see https://developer.wordpress.org/apis/security/sanitizing/
	 * @see https://www.php.net/manual/en/function.gettype.php
	 *
	 * @throws Exception    If the fetched value does not match the specified $type or if $default itself is not of the correct type.
	 *
	 * @return Mixed The superglobal or global variable value or null
	 */
	public static function fetch_superglobal($superglobal, $key, $default = null, $auto_unslash = false, $type = null, $sanitisation = null) {

		$superglobal = '_'.strtoupper($superglobal);
		
		// N.B. Superglobals can only be dereferenced by variable variables in the global scope; this is why we have to use $GLOBALS
		if (!is_array($GLOBALS[$superglobal]) || !isset($GLOBALS[$superglobal][$key])) {
			$putative_return = $default;
		} else {
			$putative_return = (is_string($GLOBALS[$superglobal][$key]) || is_array($GLOBALS[$superglobal][$key])) && $auto_unslash ? self::wp_unslash($GLOBALS[$superglobal][$key], false) : $GLOBALS[$superglobal][$key];
			if (null !== $sanitisation) {
				$putative_return = call_user_func($sanitisation, $putative_return);
			}
			if (null !== $type) {
				if (strtolower(gettype($putative_return)) !== strtolower($type)) {
					$putative_return = $default;
				}
			}
		}
		
		if (null !== $type) {
			if (strtolower(gettype($putative_return)) !== strtolower($type)) {
				throw new Exception('fetch_superglobal() was unable to return any value of the required type '.$type, 255);
			}
		}
		
		return $putative_return;

	}

	/**
	 * Fetch multiple values from superglobals using fetch_superglobal().
	 *
	 * Each argument should be an array with the structure:
	 * array( $superglobal, $key, $default, $auto_unslash, $type, $sanitisation )
	 *
	 * @return array
	 */
	public static function fetch_superglobal_array() {
		$args = func_get_args();
		if (empty($args)) return array();

		$results = array();
		foreach ($args as $arg) {
			if (!is_array($arg) || count($arg) < 2) continue;

			$superglobal  = $arg[0];
			$key = $arg[1];
			$default = isset($arg[2]) ? $arg[2] : null;
			$auto_unslash = isset($arg[3]) ? $arg[3] : false;
			$type = isset($arg[4]) ? $arg[4] : null;
			$sanitisation = isset($arg[5]) ? $arg[5] : null;

			$results[$key] = self::fetch_superglobal($superglobal, $key, $default, $auto_unslash, $type, $sanitisation);
		}

		return $results;
	}

	/**
	 * Parse a filename into components
	 *
	 * @param String $filename - the filename
	 *
	 * @return Array|Boolean - the parsed values, or false if parsing failed
	 */
	public static function parse_filename($filename) {
		if (preg_match('/^backup_([\-0-9]{10})-([0-9]{4})_.*_([0-9a-f]{12})-([\-a-z]+)([0-9]+)?+\.(zip|gz|gz\.crypt)$/i', $filename, $matches)) {
			return array(
				'date' => strtotime($matches[1].' '.$matches[2]),
				'nonce' => $matches[3],
				'type' => $matches[4],
				'index' => (empty($matches[5]) ? 0 : $matches[5]-1),
				'extension' => $matches[6]
			);
		} else {
			return false;
		}
	}
	
	/**
	 * Convert a number of bytes into a suitable textual string
	 *
	 * @param Integer $size - the number of bytes
	 *
	 * @return String - the resulting textual string
	 */
	public static function convert_numeric_size_to_text($size) {
		if ($size > 1073741824) {
			return round($size / 1073741824, 1).' GB';
		} elseif ($size > 1048576) {
			return round($size / 1048576, 1).' MB';
		} elseif ($size > 1024) {
			return round($size / 1024, 1).' KB';
		} else {
			return round($size, 1).' B';
		}
	}

	/**
	 * Add backquotes to tables and db-names in SQL queries. Taken from phpMyAdmin.
	 *
	 * @param  string $a_name - the table name
	 * @return string - the quoted table name
	 */
	public static function backquote($a_name) {
		if (!empty($a_name) && '*' != $a_name) {
			if (is_array($a_name)) {
				$result = array();
				foreach ($a_name as $key => $val) {
					$result[$key] = '`'.$val.'`';
				}
				return $result;
			} else {
				return '`'.$a_name.'`';
			}
		} else {
			return $a_name;
		}
	}
	
	/**
	 * Remove empty (according to empty()) members of an array
	 *
	 * @param Array $list - input array
	 * @return Array - pruned array
	 */
	public static function remove_empties($list) {
		if (!is_array($list)) return $list;
		foreach ($list as $ind => $entry) {
			if (empty($entry)) unset($list[$ind]);
		}
		return $list;
	}

	/**
	 * Sort restoration entities
	 *
	 * @param String $a - first entity
	 * @param String $b - second entity
	 *
	 * @return Integer - sort result
	 */
	public static function sort_restoration_entities($a, $b) {
		if ($a == $b) return 0;
		// Put the database first
		// Put wpcore after plugins/uploads/themes (needed for restores of foreign all-in-one formats)
		if ('db' == $a || 'wpcore' == $b) return -1;
		if ('db' == $b || 'wpcore' == $a) return 1;
		// After wpcore, next last is others
		if ('others' == $b) return -1;
		if ('others' == $a) return 1;
		// And then uploads - this is only because we want to make sure uploads is after plugins, so that we know before we get to the uploads whether the version of UD which might have to unpack them can do this new-style or not.
		if ('uploads' == $b) return -1;
		if ('uploads' == $a) return 1;
		return strcmp($a, $b);
	}
	
	/**
	 * This options filter removes ABSPATH off the front of updraft_dir, if it is given absolutely and contained within it
	 *
	 * @param  String $updraft_dir Directory
	 * @return String
	 */
	public static function prune_updraft_dir_prefix($updraft_dir) {
		if ('/' == substr($updraft_dir, 0, 1) || "\\" == substr($updraft_dir, 0, 1) || preg_match('/^[a-zA-Z]:/', $updraft_dir)) {
			$wcd = trailingslashit(WP_CONTENT_DIR);
			if (strpos($updraft_dir, $wcd) === 0) {
				$updraft_dir = substr($updraft_dir, strlen($wcd));
			}
		}
		return $updraft_dir;
	}
	
	public static function get_mime_type_from_filename($filename, $allow_gzip = true) {
		if ('.zip' == substr($filename, -4, 4)) {
			return 'application/zip';
		} elseif ('.tar' == substr($filename, -4, 4)) {
			return 'application/x-tar';
		} elseif ('.tar.gz' == substr($filename, -7, 7)) {
			return 'application/x-tgz';
		} elseif ('.tar.bz2' == substr($filename, -8, 8)) {
			return 'application/x-bzip-compressed-tar';
		} elseif ($allow_gzip && '.gz' == substr($filename, -3, 3)) {
			// When we sent application/x-gzip as a content-type header to the browser, we found a case where the server compressed it a second time (since observed several times)
			return 'application/x-gzip';
		} else {
			return 'application/octet-stream';
		}
	}
	
	/**
	 * Filter the value to ensure it is between 1 and 9999
	 *
	 * @param Integer $input
	 *
	 * @return Integer
	 */
	public static function retain_range($input) {
		$input = (int) $input;
		return ($input > 0) ? min($input, 9999) : 1;
	}

	/**
	 * Find matching string from $str_arr1 and $str_arr2
	 *
	 * @param array   $str_arr1                  array of strings
	 * @param array   $str_arr2                  array of strings
	 * @param boolean $match_until_first_numeric only match until first numeric occurrence
	 * @return string matching str which will be best for replacement
	 */
	public static function get_matching_str_from_array_elems($str_arr1, $str_arr2, $match_until_first_numeric = true) {
		$matching_str = '';
		if ($match_until_first_numeric) {
			$str_partial_arr = array();
			foreach ($str_arr1 as $str1) {
				$str1_str_length = strlen($str1);
				$temp_str1_chars = str_split($str1);
				$temp_partial_str = '';
				// The flag is for whether non-numeric character passed after numeric character occurrence in str1. For ex. str1 is utf8mb4, the flag wil be true when parsing m after utf8.
				$numeric_char_pass_flag = false;
				$char_position_in_str1 = 0;
				while ($char_position_in_str1 < $str1_str_length) {
					if ($numeric_char_pass_flag && !is_numeric($temp_str1_chars[$char_position_in_str1])) {
						break;
					}
					if (is_numeric($temp_str1_chars[$char_position_in_str1])) {
						$numeric_char_pass_flag = true;
					}
					$temp_partial_str .= $temp_str1_chars[$char_position_in_str1];
					$char_position_in_str1++;
				}
				$str_partial_arr[] = $temp_partial_str;
			}
			foreach ($str_partial_arr as $str_partial) {
				if (!empty($matching_str)) {
					break;
				}
				foreach ($str_arr2 as $str2) {
					if (0 === stripos($str2, $str_partial)) {
						$matching_str = $str2;
						break;
					}
				}
			}
		} else {
			$str1_partial_first_arr = array();
			$str1_partial_first_arr = array();
			$str1_partial_start_n_middle_arr = array();
			$str1_partial_middle_n_last_arr = array();
			$str1_partial_last_arr = array();
			foreach ($str_arr1 as $str1) {
				$str1_partial_arr = explode('_', $str1);
				$str1_parts_count = count($str1_partial_arr);
				$str1_partial_first_arr[] = $str1_partial_arr[0];
				$str1_last_part_index = $str1_parts_count - 1;
				if ($str1_last_part_index > 0) {
					$str1_partial_last_arr[] = $str1_partial_arr[$str1_last_part_index];
					$str1_partial_start_n_middle_arr[] = substr($str1, 0, stripos($str1, '_'));
					$str1_partial_middle_n_last_arr[] = substr($str1, stripos($str1, '_') + 1);
				}
			}
			for ($case_no = 1; $case_no <= 5; $case_no++) {
				if (!empty($matching_str)) {
					break;
				}
				foreach ($str_arr2 as $str2) {
					switch ($case_no) {
						// Case 1: Both Start and End match
						case 1:
						$str2_partial_arr = explode('_', $str2);
						$str2_first_part = $str2_partial_arr[0];
						$str2_parts_count = count($str2_partial_arr);
						$str2_last_part_index = $str2_parts_count - 1;
						if ($str2_last_part_index > 0) {
								$str2_last_part = $str2_partial_arr[$str2_last_part_index];
						} else {
														$str2_last_part = '';
						}
						if (!empty($str2_last_part) && !empty($str1_partial_last_arr) && in_array($str2_first_part, $str1_partial_first_arr) && in_array($str2_last_part, $str1_partial_last_arr)) {
								$matching_str = $str2;
						}
							break;
						// Case 2: Start Middle Match
						case 2:
						$str2_partial_first_n_middle_parts = substr($str2, 0, stripos($str2, '_'));
						if (in_array($str2_partial_first_n_middle_parts, $str1_partial_start_n_middle_arr)) {
								$matching_str = $str2;
						}
							break;
						// Case 3: End Middle Match
						case 3:
						$str2_partial_middle_n_last_parts = stripos($str2, '_') !== false ? substr($str2, stripos($str2, '_') + 1) : '';
						if (!empty($str2_partial_middle_n_last_parts) && in_array($str2_partial_middle_n_last_parts, $str1_partial_middle_n_last_arr)) {
								$matching_str = $str2;
						}
							break;
						// Case 4: Start Match (low possibilities)
						case 4:
						$str2_partial_arr = explode('_', $str2);
						$str2_first_part = $str2_partial_arr[0];
						if (in_array($str2_first_part, $str1_partial_first_arr)) {
								$matching_str = $str2;
						}
							break;
						// Case 5: End Match (low possibilities)
						case 5:
						$str2_partial_arr = explode('_', $str2);
						$str2_parts_count = count($str2_partial_arr);
						$str2_last_part_index = $str2_parts_count - 1;
						if ($str2_last_part_index > 0) {
								$str2_last_part = $str2_partial_arr[$str2_last_part_index];
						} else {
														$str2_last_part = '';
						}
						if (!empty($str2_last_part) && in_array($str2_last_part, $str1_partial_last_arr)) {
								$matching_str = $str2;
						}
							break;
					}
					if (!empty($matching_str)) {
						break;
					}
				}
			}
		}
		return $matching_str;
	}
	
	/**
	 * Produce a normalised version of a URL, useful for comparisons. This may produce a URL that does not actually reference the same location; its purpose is only to use in comparisons of two URLs that *both* go through this function.
	 *
	 * @param String $url - the URL
	 *
	 * @return String - normalised
	 */
	public static function normalise_url($url) {
		$parsed_descrip_url = parse_url($url);
		if (is_array($parsed_descrip_url)) {
			if (preg_match('/^www\./i', $parsed_descrip_url['host'], $matches)) $parsed_descrip_url['host'] = substr($parsed_descrip_url['host'], 4);
			$normalised_descrip_url = 'http://'.strtolower($parsed_descrip_url['host']);
			if (!empty($parsed_descrip_url['port'])) $normalised_descrip_url .= ':'.$parsed_descrip_url['port'];
			if (!empty($parsed_descrip_url['path'])) $normalised_descrip_url .= untrailingslashit($parsed_descrip_url['path']);
		} else {
			$normalised_descrip_url = untrailingslashit($url);
		}
		return $normalised_descrip_url;
	}

	/**
	 * Normalize a filesystem path.
	 *
	 * On windows systems, replaces backslashes with forward slashes
	 * and forces upper-case drive letters.
	 * Allows for two leading slashes for Windows network shares, but
	 * ensures that all other duplicate slashes are reduced to a single.
	 *
	 * @param string $path Path to normalize.
	 * @return string Normalized path.
	 */
	public static function wp_normalize_path($path) {
		// wp_normalize_path is not present before WP 3.9
		if (function_exists('wp_normalize_path')) return wp_normalize_path($path);
		// Taken from WP 4.6
		$path = str_replace('\\', '/', $path);
		$path = preg_replace('|(?<=.)/+|', '/', $path);
		if (':' === substr($path, 1, 1)) {
			$path = ucfirst($path);
		}
		return $path;
	}

	/**
	 * Given a set of times, find details about the maximum
	 *
	 * @param Array	  $time_passed - a list of times passed, with numerical indexes
	 * @param Integer $upto		   - last index to consider
	 * @param Integer $first_run   - first index to consider
	 *
	 * @return Array - a list with entries, in order: maximum time, list in string format, how many run times were found
	 */
	public static function max_time_passed($time_passed, $upto, $first_run) {
		$max_time = 0;
		$timings_string = "";
		$run_times_known = 0;
		for ($i = $first_run; $i <= $upto; $i++) {
			$timings_string .= "$i:";
			if (isset($time_passed[$i])) {
				$timings_string .= round($time_passed[$i], 1).' ';
				$run_times_known++;
				if ($time_passed[$i] > $max_time) $max_time = round($time_passed[$i]);
			} else {
				$timings_string .= '? ';
			}
		}
		return array($max_time, $timings_string, $run_times_known);
	}
	
	/**
	 * Determine if a given string ends with a given substring.
	 *
	 * @param  string $haystack string
	 * @param  string $needle   substring which should be checked at the end of the string
	 * @return boolean Whether string ends with the substring or not
	 */
	public static function str_ends_with($haystack, $needle) {
		if (substr($haystack, - strlen($needle)) == $needle) return true;
		return false;
	}

	/**
	 * Returns a random string of given length.
	 *
	 * @param  string $length integer
	 * @return string random string
	 */
	public static function generate_random_string($length = 2) {
		$characters = '0123456789abcdefghijklmnopqrstuvwxyz';
		$characters_length = strlen($characters);
		$random_string = '';
		for ($i = 0; $i < $length; $i++) {
			$random_string .= $characters[wp_rand(0, $characters_length - 1)];
		}
		return $random_string;
	}

	/**
	 * Returns an anonymized IPv4 or IPv6 address.
	 *
	 * @param string $ip_addr The IPv4 or IPv6 address to be anonymized.
	 * @return string  The anonymized IP address.
	 */
	public static function wp_privacy_anonymize_ip($ip_addr) {
		if (empty($ip_addr)) {
			return '0.0.0.0';
		}
	
		$ip_prefix = '';
		$is_ipv6   = substr_count($ip_addr, ':') > 1;
		$is_ipv4   = (3 === substr_count($ip_addr, '.'));
	
		if ($is_ipv6 && $is_ipv4) {
			$ip_prefix = '::ffff:';
			$ip_addr   = preg_replace('/^\[?[0-9a-f:]*:/i', '', $ip_addr);
			$ip_addr   = str_replace(']', '', $ip_addr);
			$is_ipv6   = false;
		}
	
		if ($is_ipv6) {
			$percent       = strpos($ip_addr, '%');
			$netmask       = 'ffff:ffff:ffff:ffff:0000:0000:0000:0000';
	
			if (preg_match('#\[(.*)\]#', $ip_addr, $matches)) $ip_addr = $matches[1];
	
			if (false !== $percent) {
				$ip_addr = substr($ip_addr, 0, $percent);
			}
	
			if (preg_match('/[^0-9a-f:]/i', $ip_addr)) {
				return '::';
			}
	
			if (function_exists('inet_pton') && function_exists('inet_ntop')) {
				$ip_addr = inet_ntop(inet_pton($ip_addr) & inet_pton($netmask));
				if (false === $ip_addr) {
					return '::';
				}
			}
		} elseif ($is_ipv4) {
			$last_octet_position = strrpos($ip_addr, '.');
			$ip_addr             = substr($ip_addr, 0, $last_octet_position) . '.0';
		} else {
			return '0.0.0.0';
		}
	
		return $ip_prefix . $ip_addr;
	}

	/**
	 * Returns uniform "anonymous" data by type.
	 *
	 * @param string $type The type of data to be anonymized.
	 * @param string $data Optional The data to be anonymized.
	 * @return string The anonymous data for the requested type.
	 */
	public static function anonymize_data($type, $data = '') {
		switch ($type) {
			case 'email':
				$anonymous = 'invalid@example.com';
				break;
			case 'url':
				$anonymous = 'https://invalid.example.com';
				break;
			case 'ip':
				$anonymous = self::wp_privacy_anonymize_ip($data);
				break;
			case 'date':
				$anonymous = '0000-00-00 00:00:00';
				break;
			case 'text':
				/* translators: Deleted text. */
				$anonymous = __('[deleted]', 'updraftplus');
				break;
			case 'longtext':
				/* translators: Deleted long text. */
				$anonymous = __('This content was deleted in order to anonymize it.', 'updraftplus');
				break;
			default:
				$anonymous = '';
				break;
		}
		return $anonymous;
	}

	/**
	 * Send the error message to the PHP system logger if the 'WP_DEBUG' constant is 'true' or the 'updraft_debug_mode' is activated.
	 *
	 * @param string $message - the error message
	 *
	 * @return void
	 */
	public static function error_log($message) {
		if ((defined('WP_DEBUG') && WP_DEBUG) || (class_exists('UpdraftPlus_Options') && UpdraftPlus_Options::get_updraft_option('updraft_debug_mode'))) {
			error_log($message); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log -- error_log() is intentionally used to log the error when debug mode is enabled.
		}
	}
}
