rxdb/src/plugins/utils/utils-premium.ts

A local-first realtime NoSQL Database for JavaScript applications - https://rxdb.info/

import { RXDB_UTILS_GLOBAL } from './utils-global.ts';
import { defaultHashSha256 } from './utils-hash.ts';
import { PROMISE_RESOLVE_FALSE } from './utils-promise.ts';

export const PREMIUM_FLAG_HASH = '6da4936d1425ff3a5c44c02342c6daf791d266be3ae8479b8ec59e261df41b93';
export const NON_PREMIUM_COLLECTION_LIMIT = 16;

let hasPremiumPromise: Promise<boolean> = PROMISE_RESOLVE_FALSE;
let premiumChecked = false;

/**
 * Here we check if the premium flag has been set.
 * This code exists in the open source version of RxDB.
 * Yes you are allowed to fork the repo and just overwrite this function.
 * However you might better spend this time developing your real project
 * and supporting the RxDB efforts by buying premium.
 */
export async function hasPremiumFlag() {
    if (premiumChecked) {
        return hasPremiumPromise;
    }
    premiumChecked = true;

    hasPremiumPromise = (async () => {
        if (
            RXDB_UTILS_GLOBAL.premium &&
            typeof RXDB_UTILS_GLOBAL.premium === 'string' &&
            (await defaultHashSha256(RXDB_UTILS_GLOBAL.premium) === PREMIUM_FLAG_HASH)
        ) {
            return true;
        } else {
            return false;
        }
    })();

    return hasPremiumPromise;
}