error handling

                                postvars['displayname'], postvars['email_quota'], postvars['fallback_email'],

                                postvars['nextcloud_quota'])

    def create_account(self,

                       target_email: str, # was $resultmail

                       password: str, # was $pw

                       password_confirm: str, # was $pw2

                       displayname: str, # was $name

                       email_quota: str, # was $quota

                       fallback_email: str, # new parameter

                       nextcloud_quota: str # new parameter

                       ):

    def create_account(self, target_email: str, password: str, password_confirm: str, displayname: str, email_quota: str,

                       fallback_email: str, nextcloud_quota: str):

        target_username = target_email.split('@')[0]

        with open('forbidden_usernames') as f:

            if target_username in f.read().splitlines():

            ssh.set_missing_host_key_policy(paramiko.MissingHostKeyPolicy)

            ssh.connect(hostname='postfixadmin', username='pfexec', password=os.environ['POSTFIXADMIN_SSH_PASSWORD'])

            stdin, stdout, stderr = ssh.exec_command(f'/postfixadmin/scripts/postfixadmin-cli mailbox view "{target_email}"')

            stdin, stdout, stderr = ssh.exec_command(

                f'/postfixadmin/scripts/postfixadmin-cli mailbox view "{target_email}"')

            if b"error: the email is not valid!" not in stderr.read().lower():

                data = json.dumps({'success': True, 'message': 'username_taken'})

                self.respond(403, data)

                return

            ssh.exec_command(f'/postfixadmin/scripts/postfixadmin-cli mailbox add "{target_email}" ' +

            stdin, stdout, stderr = ssh.exec_command(

                f'/postfixadmin/scripts/postfixadmin-cli mailbox add "{target_email}" ' +

                f'--password "{password}" --password2 {password_confirm} --name "{displayname}" ' +

                f'--quota {email_quota} --active 1 --welcome-mail 0')

            print(stdout.read())

            print(stderr.read())

            print(f'exit code: {stdout.channel.recv_exit_status()}')

            # TODO: handle errors

        # Edit nextcloud account, set quota and email

        auth = HTTPBasicAuth(os.environ['NEXTCLOUD_ADMIN_USER'], os.environ['NEXTCLOUD_ADMIN_PASSWORD'])

        url = f'https://drive.{os.environ["DOMAIN"]}/ocs/v1.php/cloud/users/' + target_email

        headers = {'OCS-APIRequest': 'true'}

        r = requests.put(url, data={'key': 'email', 'value': fallback_email}, headers=headers, auth=auth)

        print(r.text)

        print(f'status code: {r.status_code}')

        # TODO: check status code

        r = requests.put(url, data={'key': 'quota', 'value': nextcloud_quota}, headers=headers, auth=auth)

        print(r.text)

        print(f'status code: {r.status_code}')

        # TODO: check status code

        r1 = requests.put(url, data={'key': 'email', 'value': fallback_email}, headers=headers, auth=auth)

        r2 = requests.put(url, data={'key': 'quota', 'value': nextcloud_quota}, headers=headers, auth=auth)

        print(r1.text)

        print(f'status code: {r1.status_code}')

        print(r2.text)

        print(f'status code: {r2.status_code}')

        if r1.status_code != 200 or r2.status_code != 200:

            data = json.dumps({'success': False, 'message': 'internal_error'})

            self.respond(403, data)

            return

        self.respond(200, json.dumps({'success': True}))