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<?php
class ParameterValidator
{
/**
* Validate and sanitize user inputs against configured bridge parameters (contexts)
*/
public function validateInput(array &$input, $contexts): array
{
$errors = [];
foreach ($input as $name => $value) {
$registered = false;
foreach ($contexts as $contextName => $contextParameters) {
if (!array_key_exists($name, $contextParameters)) {
continue;
}
$registered = true;
if (!isset($contextParameters[$name]['type'])) {
// Default type is text
$contextParameters[$name]['type'] = 'text';
}
switch ($contextParameters[$name]['type']) {
case 'number':
$input[$name] = $this->validateNumberValue($value);
break;
case 'checkbox':
$input[$name] = $this->validateCheckboxValue($value);
break;
case 'list':
$input[$name] = $this->validateListValue($value, $contextParameters[$name]['values']);
break;
default:
case 'text':
if (isset($contextParameters[$name]['pattern'])) {
$input[$name] = $this->validateTextValue($value, $contextParameters[$name]['pattern']);
} else {
$input[$name] = $this->validateTextValue($value);
}
break;
}
if (
is_null($input[$name])
&& isset($contextParameters[$name]['required'])
&& $contextParameters[$name]['required']
) {
$errors[] = ['name' => $name, 'reason' => 'Parameter is invalid!'];
}
}
if (!$registered) {
$errors[] = ['name' => $name, 'reason' => 'Parameter is not registered!'];
}
}
return $errors;
}
/**
* Get the name of the context matching the provided inputs
*
* @param array $input Associative array of user data
* @param array $contexts Array of bridge parameters
* @return string|null Returns the context name or null if no match was found
*/
public function getQueriedContext(array $input, array $contexts)
{
$queriedContexts = [];
// Detect matching context
foreach ($contexts as $contextName => $contextParameters) {
$queriedContexts[$contextName] = null;
// Ensure all user data exist in the current context
$notInContext = array_diff_key($input, $contextParameters);
if (array_key_exists('global', $contexts)) {
$notInContext = array_diff_key($notInContext, $contexts['global']);
}
if (count($notInContext) > 0) {
continue;
}
// Check if all parameters of the context are satisfied
foreach ($contextParameters as $id => $properties) {
if (!empty($input[$id])) {
$queriedContexts[$contextName] = true;
} elseif (
isset($properties['type'])
&& ($properties['type'] === 'checkbox' || $properties['type'] === 'list')
) {
continue;
} elseif (isset($properties['required']) && $properties['required'] === true) {
$queriedContexts[$contextName] = false;
break;
}
}
}
// Abort if one of the globally required parameters is not satisfied
if (
array_key_exists('global', $contexts)
&& $queriedContexts['global'] === false
) {
return null;
}
unset($queriedContexts['global']);
switch (array_sum($queriedContexts)) {
case 0:
// Found no match, is there a context without parameters?
if (isset($input['context'])) {
return $input['context'];
}
foreach ($queriedContexts as $context2 => $queried) {
if (is_null($queried)) {
return $context2;
}
}
return null;
case 1:
// Found unique match
return array_search(true, $queriedContexts);
default:
return false;
}
}
private function validateTextValue($value, $pattern = null)
{
if (is_null($pattern)) {
// No filtering taking place
$filteredValue = filter_var($value);
} else {
$filteredValue = filter_var($value, FILTER_VALIDATE_REGEXP, ['options' => ['regexp' => '/^' . $pattern . '$/']]);
}
if ($filteredValue === false) {
return null;
}
return $filteredValue;
}
private function validateNumberValue($value)
{
$filteredValue = filter_var($value, FILTER_VALIDATE_INT);
if ($filteredValue === false) {
return null;
}
return $filteredValue;
}
private function validateCheckboxValue($value)
{
return filter_var($value, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
}
private function validateListValue($value, $expectedValues)
{
$filteredValue = filter_var($value);
if ($filteredValue === false) {
return null;
}
if (!in_array($filteredValue, $expectedValues)) {
// Check sub-values?
foreach ($expectedValues as $subName => $subValue) {
if (is_array($subValue) && in_array($filteredValue, $subValue)) {
return $filteredValue;
}
}
return null;
}
return $filteredValue;
}
}
|
