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<?php
abstract class request_handler {
const GET = 'GET';
const POST = 'POST';
private static array $AllowedInputTypes = ['i', 'f', 'b', 'e' /* enum */];
public function dispatch(string $act) {
$method = $_SERVER['REQUEST_METHOD'] == 'POST' ? 'POST' : 'GET';
return $this->call_act($method, $act);
}
protected function before_dispatch(string $method, string $act)/*: ?array*/ {
return null;
}
protected function call_act(string $method, string $act, array $input = []) {
global $RouterInput;
$notfound = !method_exists($this, $method.'_'.$act) || !((new ReflectionMethod($this, $method.'_'.$act))->isPublic());
if ($notfound)
$this->method_not_found($method, $act);
if (!empty($input)) {
foreach ($input as $k => $v)
$RouterInput[$k] = $v;
}
$args = $this->before_dispatch($method, $act);
return call_user_func_array([$this, $method.'_'.$act], is_array($args) ? [$args] : []);
}
abstract protected function method_not_found(string $method, string $act);
protected function input(string $input, bool $as_assoc = false): array {
$input = preg_split('/,\s+?/', $input, null, PREG_SPLIT_NO_EMPTY);
$ret = [];
foreach ($input as $var) {
list($type, $name, $enum_values, $enum_default) = self::parse_input_var($var);
$value = param($name);
switch ($type) {
case 'i':
if (is_null($value) && !is_null($enum_default)) {
$value = (int)$enum_default;
} else {
$value = (int)$value;
}
break;
case 'f':
if (is_null($value) && !is_null($enum_default)) {
$value = (float)$enum_default;
} else {
$value = (float)$value;
}
break;
case 'b':
if (is_null($value) && !is_null($enum_default)) {
$value = (bool)$enum_default;
} else {
$value = (bool)$value;
}
break;
case 'e':
if (!in_array($value, $enum_values)) {
$value = !is_null($enum_default) ? $enum_default : '';
}
break;
}
if (!$as_assoc) {
$ret[] = $value;
} else {
$ret[$name] = $value;
}
}
return $ret;
}
protected static function parse_input_var(string $var): array {
$type = null;
$name = null;
$enum_values = null;
$enum_default = null;
$pos = strpos($var, ':');
if ($pos !== false) {
$type = substr($var, 0, $pos);
$rest = substr($var, $pos+1);
if (!in_array($type, self::$AllowedInputTypes)) {
trigger_error('request_handler::parse_input_var('.$var.'): unknown type '.$type);
$type = null;
}
switch ($type) {
case 'e':
$br_from = strpos($rest, '(');
$br_to = strpos($rest, ')');
if ($br_from === false || $br_to === false) {
trigger_error('request_handler::parse_input_var('.$var.'): failed to parse enum values');
$type = null;
$name = $rest;
break;
}
$enum_values = array_map('trim', explode('|', trim(substr($rest, $br_from+1, $br_to-$br_from-1))));
$name = trim(substr($rest, 0, $br_from));
if (!empty($enum_values)) foreach ($enum_values as $key => $val) {
if (substr($val, 0, 1) == '=') {
$enum_values[$key] = substr($val, 1);
$enum_default = $enum_values[$key];
}
}
break;
default:
if (($eq_pos = strpos($rest, '=')) !== false) {
$enum_default = substr($rest, $eq_pos+1);
$rest = substr($rest, 0, $eq_pos);
}
$name = trim($rest);
break;
}
} else {
$type = 's';
$name = $var;
}
return [$type, $name, $enum_values, $enum_default];
}
}
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