vendor/bshaffer/oauth2-server-php/src/OAuth2/Scope.php

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<?php

namespace OAuth2;

use OAuth2\Storage\Memory;
use OAuth2\Storage\ScopeInterface as ScopeStorageInterface;

/**
* @see OAuth2\ScopeInterface
*/
class Scope implements ScopeInterface
{
    protected $storage;

    /**
     * @param mixed @storage
     * Either an array of supported scopes, or an instance of OAuth2\Storage\ScopeInterface
     */
    public function __construct($storage = null)
    {
        if (is_null($storage) || is_array($storage)) {
            $storage = new Memory((array) $storage);
        }

        if (!$storage instanceof ScopeStorageInterface) {
            throw new \InvalidArgumentException("Argument 1 to OAuth2\Scope must be null, an array, or instance of OAuth2\Storage\ScopeInterface");
        }

        $this->storage = $storage;
    }

    /**
     * Check if everything in required scope is contained in available scope.
     *
     * @param $required_scope
     * A space-separated string of scopes.
     *
     * @return
     * TRUE if everything in required scope is contained in available scope,
     * and FALSE if it isn't.
     *
     * @see http://tools.ietf.org/html/rfc6749#section-7
     *
     * @ingroup oauth2_section_7
     */
    public function checkScope($required_scope, $available_scope)
    {
        $required_scope = explode(' ', trim($required_scope));
        $available_scope = explode(' ', trim($available_scope));

        return (count(array_diff($required_scope, $available_scope)) == 0);
    }

    /**
     * Check if the provided scope exists in storage.
     *
     * @param $scope
     * A space-separated string of scopes.
     *
     * @return