<?php
namespace Aws\Api;
use Aws;
/**
* Validates a schema against a hash of input.
*/
class Validator
{
private $path = [];
private $errors = [];
private $constraints = [];
private static $defaultConstraints = [
'required' => true,
'min' => true,
'max' => false,
'pattern' => false
];
/**
* @param array $constraints Associative array of constraints to enforce.
* Accepts the following keys: "required", "min",
* "max", and "pattern". If a key is not
* provided, the constraint will assume false.
*/
public function __construct(array $constraints = null)
{
static $assumedFalseValues = [
'required' => false,
'min' => false,
'max' => false,
'pattern' => false
];
$this->constraints = empty($constraints)
? self::$defaultConstraints
: $constraints + $assumedFalseValues;
}
/**
* Validates the given input against the schema.
*
* @param string $name Operation name
* @param Shape $shape Shape to validate
* @param array $input Input to validate
*
* @throws \InvalidArgumentException if the input is invalid.
*/
public function validate($name, Shape $shape, array $input)
{
$this->dispatch($shape, $input);
if ($this->errors) {
$message = sprintf(
"Found %d error%s while validating the input provided for the "
. "%s operation:\n%s",
count($this->errors),
count($this->errors) > 1 ? 's' : '',
$name,
implode("\n", $this->errors)
);
$this->errors = [];
throw new \InvalidArgumentException($message);
}
}
private function dispatch(Shape $shape, $value)
{
static $methods = [
'structure' => 'check_structure',
'list' => 'check_list',
'map' => 'check_map',
'blob' => 'check_blob',
'boolean' => 'check_boolean',
'integer' => 'check_numeric',
'float' => 'check_numeric',
'long' => 'check_numeric',
'string' => 'check_string',
'byte' => 'check_string',
'char' => 'check_string'
];
$type = $shape->getType();
if (isset($methods[$type])) {
$this->{$methods[$type]}($shape, $value);
}
}
private function check_structure(StructureShape $shape, $value)
{
$isDocument = (isset($shape['document']) && $shape['document']);
if ($isDocument) {
if (!$this->checkDocumentType($value)) {
$this->addError("is not a valid document type");
return;
}
} elseif (!$this->checkAssociativeArray($value)) {
return;
}
if ($this->constraints['required'] && $shape['required']) {
foreach ($shape['required'] as $req) {
if (!isset($value[$req])) {
$this->path[] = $req;
$this->addError('is missing and is a required parameter');
array_pop($this->path);
}
}
}
if (!$isDocument) {
foreach ($value as $name => $v) {
if ($shape->hasMember($name)) {
$this->path[] = $name;
$this->dispatch(
$shape->getMember($name),
isset($value[$name]) ? $value[$name] : null
);
array_pop($this->path);
}
}
}
}
private function check_list(ListShape $shape, $value)
{
if (!is_array($value)) {
$this->addError('must be an array. Found '
. Aws\describe_type($value));
return;
}
$this->validateRange($shape, count($value), "list element count");
$items = $shape->getMember();
foreach ($value as $index => $v) {
$this->path[] = $index;
$this->dispatch($items, $v);
array_pop($this->path);
}
}
private function check_map(MapShape $shape, $value)
{
if (!$this->checkAssociativeArray($value)) {
return;
}
$values = $shape->getValue();
foreach ($value as $key => $v) {
$this->path[] = $key;
$this->dispatch($values, $v);
array_pop($this->path);
}
}
private function check_blob(Shape $shape, $value)
{
static $valid = [
'string' => true,
'integer' => true,
'double' => true,
'resource' => true
];
$type = gettype($value);
if (!isset($valid[$type])) {
if ($type != 'object' || !method_exists($value, '__toString')) {
$this->addError('must be an fopen resource, a '
. 'GuzzleHttp\Stream\StreamInterface object, or something '
. 'that can be cast to a string. Found '
. Aws\describe_type($value));
}
}
}
private function check_numeric(Shape $shape, $value)
{
if (!is_numeric($value)) {
$this->addError('must be numeric. Found '
. Aws\describe_type($value));
return;
}
$this->validateRange($shape, $value, "numeric value");
}
private function check_boolean(Shape $shape, $value)
{
if (!is_bool($value)) {
$this->addError('must be a boolean. Found '
. Aws\describe_type($value));
}
}
private function check_string(Shape $shape, $value)
{
if ($shape['jsonvalue']) {
if (!self::canJsonEncode($value)) {
$this->addError('must be a value encodable with \'json_encode\'.'
. ' Found ' . Aws\describe_type($value));
}
return;
}
if (!$this->checkCanString($value)) {
$this->addError('must be a string or an object that implements '
. '__toString(). Found ' . Aws\describe_type($value));
return;
}
$this->validateRange($shape, strlen($value), "string length");
if ($this->constraints['pattern']) {
$pattern = $shape['pattern'];
if ($pattern && !preg_match("/$pattern/", $value)) {
$this->addError("Pattern /$pattern/ failed to match '$value'");
}
}
}
private function validateRange(Shape $shape, $length, $descriptor)
{
if ($this->constraints['min']) {
$min = $shape['min'];
if ($min && $length < $min) {
$this->addError("expected $descriptor to be >= $min, but "
. "found $descriptor of $length");
}
}
if ($this->constraints['max']) {
$max = $shape['max'];
if ($max && $length > $max) {
$this->addError("expected $descriptor to be <= $max, but "
. "found $descriptor of $length");
}
}
}
private function checkArray($arr)
{
return $this->isIndexed($arr) || $this->isAssociative($arr);
}
private function isAssociative($arr)
{
return count(array_filter(array_keys($arr), "is_string")) == count($arr);
}
private function isIndexed(array $arr)
{
return $arr == array_values($arr);
}
private function checkCanString($value)
{
static $valid = [
'string' => true,
'integer' => true,
'double' => true,
'NULL' => true,
];
$type = gettype($value);
return isset($valid[$type]) ||
($type == 'object' && method_exists($value, '__toString'));
}
private function checkAssociativeArray($value)
{
$isAssociative = false;
if (is_array($value)) {
$expectedIndex = 0;
$key = key($value);
do {
$isAssociative = $key !== $expectedIndex++;
next($value);
$key = key($value);
} while (!$isAssociative && null !== $key);
}
if (!$isAssociative) {
$this->addError('must be an associative array. Found '
. Aws\describe_type($value));
return false;
}
return true;
}
private function checkDocumentType($value)
{
if (is_array($value)) {
$typeOfFirstKey = gettype(key($value));
foreach ($value as $key => $val) {
if (!$this->checkDocumentType($val) || gettype($key) != $typeOfFirstKey) {
return false;
}
}
return $this->checkArray($value);
}
return is_null($value)
|| is_numeric($value)
|| is_string($value)
|| is_bool($value);
}
private function addError($message)
{
$this->errors[] =
implode('', array_map(function ($s) { return "[{$s}]"; }, $this->path))
. ' '
. $message;
}
private function canJsonEncode($data)
{
return !is_resource($data);
}
}