Proyectos de Subversion Moodle

<?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']);

        $isUnion = (isset($shape['union']) && $shape['union']);

        if ($isDocument) {

            if (!$this->checkDocumentType($value)) {

                $this->addError("is not a valid document type");

                return;

            }

        } elseif ($isUnion) {

            if (!$this->checkUnion($value)) {

                $this->addError("is a union type and must have exactly one non null value");

                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;

        }

        $value = isset($value) ? $value : '';

        $this->validateRange($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 checkUnion($value)

    {

        if (is_array($value)) {

            $nonNullCount = 0;

            foreach ($value as $key => $val) {

                if (!is_null($val) && !(strpos($key, "@") === 0)) {

                    $nonNullCount++;

                }

            }

            return $nonNullCount == 1;

        }

        return !is_null($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);

    }

}