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<?php
/**
* Provide page/request helper functions
*/
/**
* Parse a date from da day and a time textfield.
*
* @param string $date_name
* Name of the textfield containing the day (format Y-m-d)
* @param string $time_name
* Name of the textfield containing the time (format H:i)
* @param string[] $allowed_days
* List of allowed days in format Y-m-d
* @param int $default_value
* Default value unix timestamp
*/
function check_request_datetime($date_name, $time_name, $allowed_days, $default_value) {
$time = date("H:i", $default_value);
$day = date("Y-m-d", $default_value);
if (isset($_REQUEST[$time_name]) && preg_match('#^\d{1,2}:\d\d$#', trim($_REQUEST[$time_name]))) {
$time = trim($_REQUEST[$time_name]);
}
if (isset($_REQUEST[$date_name]) && in_array($_REQUEST[$date_name], $allowed_days)) {
$day = $_REQUEST[$date_name];
}
return parse_date("Y-m-d H:i", $day . " " . $time);
}
/**
* Parse a date into unix timestamp
*
* @param string $pattern
* The date pattern (i.e. Y-m-d H:i)
* @param string $value
* The string to parse
* @return The parsed unix timestamp
*/
function parse_date($pattern, $value) {
$datetime = DateTime::createFromFormat($pattern, trim($value));
if ($datetime == null) {
return null;
}
return $datetime->getTimestamp();
}
/**
* Leitet den Browser an die übergebene URL weiter und hält das Script an.
*/
function redirect($url) {
header("Location: " . $url, true, 302);
raw_output("");
}
/**
* Echoes given output and dies.
*
* @param String $output
* String to display
*/
function raw_output($output) {
echo $output;
die();
}
/**
* Helper function for transforming list of entities into array for select boxes.
*
* @param array $data
* The data array
* @param string $key_name
* name of the column to use as id/key
* @param string $value_name
* name of the column to use as displayed value
*/
function select_array($data, $key_name, $value_name) {
$ret = [];
foreach ($data as $value) {
$ret[$value[$key_name]] = $value[$value_name];
}
return $ret;
}
/**
* Returns an int[] from given request param name.
*
* @param String $name
* Name of the request param
* @param array<int> $default
* Default return value, if param is not set
*/
function check_request_int_array($name, $default = []) {
if (isset($_REQUEST[$name]) && is_array($_REQUEST[$name])) {
return array_filter($_REQUEST[$name], 'is_numeric');
}
return $default;
}
/**
* Checks if given request item (name) can be parsed to a date.
* If not parsable, given error message is put into msg() and null is returned.
*
* @param string $input
* String to be parsed into a date.
* @param string $error_message
* the error message displayed if $input is not parsable
* @param boolean $null_allowed
* is a null value allowed?
* @return ValidationResult containing the parsed date
*/
function check_request_date($name, $error_message = null, $null_allowed = false) {
if (! isset($_REQUEST[$name])) {
return new ValidationResult($null_allowed, null);
}
return check_date($_REQUEST[$name], $error_message, $null_allowed);
}
/**
* Checks if given string can be parsed to a date.
* If not parsable, given error message is put into msg() and null is returned.
*
* @param string $input
* String to be parsed into a date.
* @param string $error_message
* the error message displayed if $input is not parsable
* @param boolean $null_allowed
* is a null value allowed?
* @return ValidationResult containing the parsed date
*/
function check_date($input, $error_message = null, $null_allowed = false) {
if ($tmp = parse_date("Y-m-d", trim($input))) {
return new ValidationResult(true, $tmp);
}
if ($null_allowed) {
return new ValidationResult(true, null);
}
error($error_message);
return new ValidationResult(false, null);
}
/**
* Returns REQUEST value filtered or default value (null) if not set.
*/
function strip_request_item($name, $default_value = null) {
if (isset($_REQUEST[$name])) {
return strip_item($_REQUEST[$name]);
}
return $default_value;
}
/**
* Testet, ob der angegebene REQUEST Wert ein Integer ist, bzw.
* eine ID sein könnte.
*/
function test_request_int($name) {
if (isset($_REQUEST[$name])) {
return preg_match("/^[0-9]*$/", $_REQUEST[$name]);
}
return false;
}
/**
* Gibt den gefilterten REQUEST Wert mit Zeilenumbrüchen zurück
*/
function strip_request_item_nl($name) {
return preg_replace("/([^\p{L}\p{S}\p{P}\p{Z}\p{N}+\n]{1,})/ui", '', strip_tags($_REQUEST[$name]));
}
/**
* Entfernt unerwünschte Zeichen
*/
function strip_item($item) {
return preg_replace("/([^\p{L}\p{S}\p{P}\p{Z}\p{N}+]{1,})/ui", '', strip_tags($item));
}
/**
* Überprüft eine E-Mail-Adresse.
*/
function check_email($email) {
return (bool) filter_var($email, FILTER_VALIDATE_EMAIL);
}
class ValidationResult {
private $valid;
private $value;
/**
* Constructor.
*
* @param boolean $valid
* Is the value valid?
* @param * $value
* The validated value
*/
public function ValidationResult($valid, $value) {
$this->valid = $valid;
$this->value = $value;
}
/**
* Is the value valid?
*/
public function isValid() {
return $this->valid;
}
/**
* The parsed/validated value.
*/
public function getValue() {
return $this->value;
}
}
?>
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