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`create_account.php`

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<?php
    $file_in = "accounts/accounts.json";
    $accounts = json_decode(file_get_contents($file_in), true);

    if(isset($_POST['username']) and isset($_POST['password'])){
        foreach ($accounts['accounts'] as $a){ #Loopar igenom accounts.json
            if($_POST['username'] == $a['user']){ #Ifall POST matchar med accounts.json
                if(sha1("LBM".$_POST['password']."Banking") == $a['password']){
                    header('location: index.php?action=login&mess=exists'); 
                    exit();
                }
                else{
                    header('location: index.php?action=login&mess=used&action=new_user'); 
                    exit();
                }
            }
        }

        $hash_pass = sha1("LBM".$_POST['password']."Banking");

        $accounts['accounts'][] = ['user'=> $_POST['username'], 'password'=> $hash_pass, 'userlvl'=> 'user'];
        $file = fopen($file_in, "w");
        fwrite($file, json_encode($accounts, JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
        fclose($file);

        $new_file = "accounts/".$_POST['username'].".json";
        $file = fopen($new_file, "w");
        fclose($file);

        header('location: index.php?action=login&mess=created'); 
        exit();
    }
    else{
        header('location: index.php?action=login&mess=error'); 
        exit();
    }
?>