RocketChat/Rocket.Chat

import type { IRoom, IUser, IUpload } from '@rocket.chat/core-typings';
import { useSetting, usePermission } from '@rocket.chat/ui-contexts';
import { useMemo } from 'react';

import { getDifference, MINUTES } from '../lib/getDifference';

export const useMessageDeletionIsAllowed = (rid: IRoom['_id'], file: IUpload, uid: IUser['_id'] | null) => {
    const canForceDelete = usePermission('force-delete-message', rid);
    const deletionIsEnabled = useSetting('Message_AllowDeleting');
    const userHasPermissionToDeleteAny = usePermission('delete-message', rid);
    const userHasPermissionToDeleteOwn = usePermission('delete-own-message');
    const bypassBlockTimeLimit = usePermission('bypass-time-limit-edit-and-delete', rid);
    const blockDeleteInMinutes = useSetting<number>('Message_AllowDeleting_BlockDeleteInMinutes');

    const isDeletionAllowed = useMemo(() => {
        if (canForceDelete) {
            return true;
        }

        if (!deletionIsEnabled) {
            return false;
        }

        if (!userHasPermissionToDeleteAny && !userHasPermissionToDeleteOwn) {
            return false;
        }

        const checkTimeframe = (file: IUpload) => {
            if (!bypassBlockTimeLimit && blockDeleteInMinutes !== 0) {
                if (!file.uploadedAt || !blockDeleteInMinutes) {
                    return false;
                }

                const currentTsDiff = getDifference(new Date(), new Date(file.uploadedAt), MINUTES);
                return currentTsDiff < blockDeleteInMinutes;
            }

            return true;
        };

        const isUserOwnFile = (file: IUpload) => file.userId === uid;

        if (userHasPermissionToDeleteAny || isUserOwnFile(file)) {
            return checkTimeframe(file);
        }

        return false;
    }, [
        canForceDelete,
        deletionIsEnabled,
        userHasPermissionToDeleteAny,
        userHasPermissionToDeleteOwn,
        blockDeleteInMinutes,
        bypassBlockTimeLimit,
        file,
        uid,
    ]);

    return isDeletionAllowed;
};