import { createHmac } from 'crypto';
import { canonicalizeJSON } from './json';

const SECRET = 'revision IDs suck';

function _addRevisionId(aDoc: any): any {
    // create the content to produce the SHA256 on
    const normDoc = canonicalizeJSON(aDoc);
    const data = JSON.stringify(normDoc);
    // produce the revision ID
    const revId = createHmac('sha256', SECRET)
        .update(data)
        .digest('base64');
    // update
    normDoc.rev = `0815-${revId}`;
    // ok
    return normDoc;
}

export {
    _addRevisionId as addRevisionId
};