<?php
namespace Guzzle\Service\Description;
use Guzzle\Common\ToArrayInterface;
/**
* Default parameter validator
*/
class SchemaValidator implements ValidatorInterface
{
/** @var self Cache instance of the object */
protected static $instance;
/** @var bool Whether or not integers are converted to strings when an integer is received for a string input */
protected $castIntegerToStringType;
/** @var array Errors encountered while validating */
protected $errors;
/**
* @return self
* @codeCoverageIgnore
*/
public static function getInstance()
{
if (!self::$instance) {
self::$instance = new self();
}
return self::$instance;
}
/**
* @param bool $castIntegerToStringType Set to true to convert integers into strings when a required type is a
* string and the input value is an integer. Defaults to true.
*/
public function __construct($castIntegerToStringType = true)
{
$this->castIntegerToStringType = $castIntegerToStringType;
}
public function validate(Parameter $param, &$value)
{
$this->errors = array();
$this->recursiveProcess($param, $value);
if (empty($this->errors)) {
return true;
} else {
sort($this->errors);
return false;
}
}
/**
* Get the errors encountered while validating
*
* @return array
*/
public function getErrors()
{
return $this->errors ?: array();
}
/**
* Recursively validate a parameter
*
* @param Parameter $param API parameter being validated
* @param mixed $value Value to validate and validate. The value may change during this validate.
* @param string $path Current validation path (used for error reporting)
* @param int $depth Current depth in the validation validate
*
* @return bool Returns true if valid, or false if invalid
*/
protected function recursiveProcess(Parameter $param, &$value, $path = '', $depth = 0)
{
// Update the value by adding default or static values
$value = $param->getValue($value);
$required = $param->getRequired();
// if the value is null and the parameter is not required or is static, then skip any further recursion
if ((null === $value && !$required) || $param->getStatic()) {
return true;
}
$type = $param->getType();
// Attempt to limit the number of times is_array is called by tracking if the value is an array
$valueIsArray = is_array($value);
// If a name is set then update the path so that validation messages are more helpful
if ($name = $param->getName()) {
$path .= "[{$name}]";
}
if ($type == 'object') {
// Objects are either associative arrays, ToArrayInterface, or some other object
if ($param->getInstanceOf()) {
$instance = $param->getInstanceOf();
if (!($value instanceof $instance)) {
$this->errors[] = "{$path} must be an instance of {$instance}";
return false;
}
}
// Determine whether or not this "value" has properties and should be traversed
$traverse = $temporaryValue = false;
// Convert the value to an array
if (!$valueIsArray && $value instanceof ToArrayInterface) {
$value = $value->toArray();
}
if ($valueIsArray) {
// Ensure that the array is associative and not numerically indexed
if (isset($value[0])) {
$this->errors[] = "{$path} must be an array of properties. Got a numerically indexed array.";
return false;
}
$traverse = true;
} elseif ($value === null) {
// Attempt to let the contents be built up by default values if possible
$value = array();
$temporaryValue = $valueIsArray = $traverse = true;
}
if ($traverse) {
if ($properties = $param->getProperties()) {
// if properties were found, the validate each property of the value
foreach ($properties as $property) {
$name = $property->getName();
if (isset($value[$name])) {
$this->recursiveProcess($property, $value[$name], $path, $depth + 1);
} else {
$current = null;
$this->recursiveProcess($property, $current, $path, $depth + 1);
// Only set the value if it was populated with something
if (null !== $current) {
$value[$name] = $current;
}
}
}
}
$additional = $param->getAdditionalProperties();
if ($additional !== true) {
// If additional properties were found, then validate each against the additionalProperties attr.
$keys = array_keys($value);
// Determine the keys that were specified that were not listed in the properties of the schema
$diff = array_diff($keys, array_keys($properties));
if (!empty($diff)) {
// Determine which keys are not in the properties
if ($additional instanceOf Parameter) {
foreach ($diff as $key) {
$this->recursiveProcess($additional, $value[$key], "{$path}[{$key}]", $depth);
}
} else {
// if additionalProperties is set to false and there are additionalProperties in the values, then fail
foreach ($diff as $prop) {
$this->errors[] = sprintf('%s[%s] is not an allowed property', $path, $prop);
}
}
}
}
// A temporary value will be used to traverse elements that have no corresponding input value.
// This allows nested required parameters with default values to bubble up into the input.
// Here we check if we used a temp value and nothing bubbled up, then we need to remote the value.
if ($temporaryValue && empty($value)) {
$value = null;
$valueIsArray = false;
}
}
} elseif ($type == 'array' && $valueIsArray && $param->getItems()) {
foreach ($value as $i => &$item) {
// Validate each item in an array against the items attribute of the schema
$this->recursiveProcess($param->getItems(), $item, $path . "[{$i}]", $depth + 1);
}
}
// If the value is required and the type is not null, then there is an error if the value is not set
if ($required && $value === null && $type != 'null') {
$message = "{$path} is " . ($param->getType() ? ('a required ' . implode(' or ', (array) $param->getType())) : 'required');
if ($param->getDescription()) {
$message .= ': ' . $param->getDescription();
}
$this->errors[] = $message;
return false;
}
// Validate that the type is correct. If the type is string but an integer was passed, the class can be
// instructed to cast the integer to a string to pass validation. This is the default behavior.
if ($type && (!$type = $this->determineType($type, $value))) {
if ($this->castIntegerToStringType && $param->getType() == 'string' && is_integer($value)) {
$value = (string) $value;
} else {
$this->errors[] = "{$path} must be of type " . implode(' or ', (array) $param->getType());
}
}
// Perform type specific validation for strings, arrays, and integers
if ($type == 'string') {
// Strings can have enums which are a list of predefined values
if (($enum = $param->getEnum()) && !in_array($value, $enum)) {
$this->errors[] = "{$path} must be one of " . implode(' or ', array_map(function ($s) {
return '"' . addslashes($s) . '"';
}, $enum));
}
// Strings can have a regex pattern that the value must match
if (($pattern = $param->getPattern()) && !preg_match($pattern, $value)) {
$this->errors[] = "{$path} must match the following regular expression: {$pattern}";
}
$strLen = null;
if ($min = $param->getMinLength()) {
$strLen = strlen($value);
if ($strLen < $min) {
$this->errors[] = "{$path} length must be greater than or equal to {$min}";
}
}
if ($max = $param->getMaxLength()) {
if (($strLen ?: strlen($value)) > $max) {
$this->errors[] = "{$path} length must be less than or equal to {$max}";
}
}
} elseif ($type == 'array') {
$size = null;
if ($min = $param->getMinItems()) {
$size = count($value);
if ($size < $min) {
$this->errors[] = "{$path} must contain {$min} or more elements";
}
}
if ($max = $param->getMaxItems()) {
if (($size ?: count($value)) > $max) {
$this->errors[] = "{$path} must contain {$max} or fewer elements";
}
}
} elseif ($type == 'integer' || $type == 'number' || $type == 'numeric') {
if (($min = $param->getMinimum()) && $value < $min) {
$this->errors[] = "{$path} must be greater than or equal to {$min}";
}
if (($max = $param->getMaximum()) && $value > $max) {
$this->errors[] = "{$path} must be less than or equal to {$max}";
}
}
return empty($this->errors);
}
/**
* From the allowable types, determine the type that the variable matches
*
* @param string $type Parameter type
* @param mixed $value Value to determine the type
*
* @return string|bool Returns the matching type on
*/
protected function determineType($type, $value)
{
foreach ((array) $type as $t) {
if ($t == 'string' && (is_string($value) || (is_object($value) && method_exists($value, '__toString')))) {
return 'string';
} elseif ($t == 'object' && (is_array($value) || is_object($value))) {
return 'object';
} elseif ($t == 'array' && is_array($value)) {
return 'array';
} elseif ($t == 'integer' && is_integer($value)) {
return 'integer';
} elseif ($t == 'boolean' && is_bool($value)) {
return 'boolean';
} elseif ($t == 'number' && is_numeric($value)) {
return 'number';
} elseif ($t == 'numeric' && is_numeric($value)) {
return 'numeric';
} elseif ($t == 'null' && !$value) {
return 'null';
} elseif ($t == 'any') {
return 'any';
}
}
return false;
}
}