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Filename : Guard.php
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<?php

namespace Spatie\Permission;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Collection;

class Guard
{
    /**
     * Return a collection of guard names suitable for the $model,
     * as indicated by the presence of a $guard_name property or a guardName() method on the model.
     *
     * @param  string|Model  $model model class object or name
     */
    public static function getNames($model): Collection
    {
        $class = is_object($model) ? get_class($model) : $model;

        if (is_object($model)) {
            if (\method_exists($model, 'guardName')) {
                $guardName = $model->guardName();
            } else {
                $guardName = $model->getAttributeValue('guard_name');
            }
        }

        if (! isset($guardName)) {
            $guardName = (new \ReflectionClass($class))->getDefaultProperties()['guard_name'] ?? null;
        }

        if ($guardName) {
            return collect($guardName);
        }

        return self::getConfigAuthGuards($class);
    }

    /**
     * Get list of relevant guards for the $class model based on config(auth) settings.
     *
     * Lookup flow:
     * - get names of models for guards defined in auth.guards where a provider is set
     * - filter for provider models matching the model $class being checked (important for Lumen)
     * - keys() gives just the names of the matched guards
     * - return collection of guard names
     */
    protected static function getConfigAuthGuards(string $class): Collection
    {
        return collect(config('auth.guards'))
            ->map(function ($guard) {
                if (! isset($guard['provider'])) {
                    return null;
                }

                return config("auth.providers.{$guard['provider']}.model");
            })
            ->filter(function ($model) use ($class) {
                return $class === $model;
            })
            ->keys();
    }

    /**
     * Lookup a guard name relevant for the $class model and the current user.
     *
     * @param  string|Model  $class model class object or name
     * @return string guard name
     */
    public static function getDefaultName($class): string
    {
        $default = config('auth.defaults.guard');

        $possible_guards = static::getNames($class);

        // return current-detected auth.defaults.guard if it matches one of those that have been checked
        if ($possible_guards->contains($default)) {
            return $default;
        }

        return $possible_guards->first() ?: $default;
    }
}