element-call/src/room/AppSelectionModal.tsx

/*
Copyright 2023, 2024 New Vector Ltd.

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
*/

import { FC, MouseEvent, useCallback, useMemo, useState } from "react";
import { useTranslation } from "react-i18next";
import { Button, Text } from "@vector-im/compound-web";
import { PopOutIcon } from "@vector-im/compound-design-tokens/assets/web/icons";
import { logger } from "matrix-js-sdk/src/logger";

import { Modal } from "../Modal";
import { useRoomEncryptionSystem } from "../e2ee/sharedKeyManagement";
import { getAbsoluteRoomUrl } from "../utils/matrix";
import styles from "./AppSelectionModal.module.css";
import { editFragmentQuery } from "../UrlParams";
import { E2eeType } from "../e2ee/e2eeType";

interface Props {
  roomId: string;
}

export const AppSelectionModal: FC<Props> = ({ roomId }) => {
  const { t } = useTranslation();

  const [open, setOpen] = useState(true);
  const onBrowserClick = useCallback(
    (e: MouseEvent) => {
      e.preventDefault();
      e.stopPropagation();
      setOpen(false);
    },
    [setOpen],
  );
  const e2eeSystem = useRoomEncryptionSystem(roomId);

  if (e2eeSystem.kind === E2eeType.NONE) {
    logger.error(
      "Generating app redirect URL for encrypted room but don't have key available!",
    );
  }

  const appUrl = useMemo(() => {
    // If the room ID is not known, fall back to the URL of the current page
    // Also, we don't really know the room name at this stage as we haven't
    // started a client and synced to get the room details. We could take the one
    // we got in our own URL and use that, but it's not a string that a human
    // ever sees so it's somewhat redundant. We just don't pass a name.
    const url = new URL(
      roomId === null
        ? window.location.href
        : getAbsoluteRoomUrl(roomId, e2eeSystem),
    );
    // Edit the URL to prevent the app selection prompt from appearing a second
    // time within the app, and to keep the user confined to the current room
    url.hash = editFragmentQuery(url.hash, (params) => {
      params.set("appPrompt", "false");
      params.set("confineToRoom", "true");
      return params;
    });

    const result = new URL("io.element.call:/");
    result.searchParams.set("url", url.toString());
    return result.toString();
  }, [e2eeSystem, roomId]);

  return (
    <Modal
      className={styles.modal}
      title={t("app_selection_modal.title")}
      open={open}
    >
      <Text size="md" weight="semibold">
        {t("app_selection_modal.text")}
      </Text>
      <Button kind="secondary" onClick={onBrowserClick}>
        {t("app_selection_modal.continue_in_browser")}
      </Button>
      <Button as="a" href={appUrl} Icon={PopOutIcon}>
        {t("app_selection_modal.open_in_app")}
      </Button>
    </Modal>
  );
};