const crypto = require('crypto');

const { handshakeGUID } = require('./constants');

const generateWebsocketAcceptValue = (websocketKey) => {
    if (typeof websocketKey !== 'string' || typeof handshakeGUID !== 'string') {
        // TODO: maybe throw error?
        return;
    }

    const concatenated = websocketKey + handshakeGUID;
    const sha1HashedInBase64 = crypto.createHash('sha1').update(concatenated, 'binary').digest('base64');
    
    return sha1HashedInBase64;
};

module.exports = { generateWebsocketAcceptValue };