invoiceninja/database/migrations/2018_05_19_095124_add_json_permissions.php

<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Migrations\Migration;
use App\Models\User;
class AddJsonPermissions extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::table('users', function ($table) {
            $table->longtext('permissionsV2');
        });
        $users = User::where('permissions', '!=', 0)->get();
        foreach($users as $user) {
            $user->permissionsV2 = self::returnFormattedPermissions($user->permissions);
            $user->save();
        }


        Schema::table('users', function ($table) {
            $table->dropColumn('permissions');
        });

        Schema::table('users', function($table)
        {
            $table->renameColumn('permissionsV2', 'permissions');
        });
    }
    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::table('users', function ($table) {
            $table->dropColumn('permissionsV2');
        });
    }
    /**
     * Transform permissions
     *
     * @return json_array
     */
    public function returnFormattedPermissions($userPermission) {
        $viewPermissionEntities = [];
        $editPermissionEntities = [];
        $createPermissionEntities = [];

        $permissionEntities = [
            'proposal',
            'expense',
            'project',
            'vendor',
            'product',
            'task',
            'quote',
            'credit',
            'payment',
            'contact',
            'invoice',
            'client',
            'recurring_invoice',
            'reports',
        ];
        foreach($permissionEntities as $entity) {
            array_push($viewPermissionEntities, 'view_'.$entity);
            array_push($editPermissionEntities, 'edit_'.$entity);
            array_push($createPermissionEntities, 'create_'.$entity);
        }
        $returnPermissions = [];
        if(array_key_exists('create_all', self::getPermissions($userPermission)))
            $returnPermissions = array_merge($returnPermissions, $createPermissionEntities);
        if(array_key_exists('edit_all',  self::getPermissions($userPermission)))
            $returnPermissions = array_merge($returnPermissions, $editPermissionEntities);
        if(array_key_exists('view_all',  self::getPermissions($userPermission)))
            $returnPermissions = array_merge($returnPermissions, $viewPermissionEntities);
        return json_encode($returnPermissions);
    }


    /**
     * Expands the value of the permissions attribute.
     *
     * @param mixed $value
     *
     * @return mixed
     */
    protected function getPermissions($value)
    {
        $permissions = [];
        foreach (static::$all_permissions as $permission => $bitmask) {
            if (($value & $bitmask) == $bitmask) {
                $permissions[$permission] = $permission;
            }
        }

        return $permissions;
    }

    /**
     * @var array
     */
    public static $all_permissions = [
        'create_all' => 0b0001,
        'view_all' => 0b0010,
        'edit_all' => 0b0100,
    ];

}