@splitsoftware/splitio-commons/esm/sync/streaming/parseUtils.js

Split JavaScript SDK common components

import { algorithms } from '../../utils/decompress';
import { decodeFromBase64 } from '../../utils/base64';
import { hash } from '../../utils/murmur3/murmur3';
var GZIP = 1;
var ZLIB = 2;
function Uint8ArrayToString(myUint8Arr) {
    return String.fromCharCode.apply(null, myUint8Arr);
}
function StringToUint8Array(myString) {
    var charCodes = myString.split('').map(function (e) { return e.charCodeAt(0); });
    return new Uint8Array(charCodes);
}
/**
 * Decode and decompress 'data' with 'compression' algorithm
 *
 * @param data - base64 encoded string
 * @param compression - 1 GZIP, 2 ZLIB
 * @returns
 * @throws if data string cannot be decoded, decompressed or the provided compression value is invalid (not 1 or 2)
 */
function decompress(data, compression) {
    var compressData = decodeFromBase64(data);
    var binData = StringToUint8Array(compressData);
    if (typeof algorithms === 'string')
        throw new Error(algorithms);
    if (compression === GZIP)
        return algorithms.gunzipSync(binData);
    if (compression === ZLIB)
        return algorithms.unzlibSync(binData);
    throw new Error("Invalid compression algorithm #" + compression);
}
/**
 * Decode, decompress and parse the provided 'data' into a KeyList object
 *
 * @param data - base64 encoded string
 * @param compression - 1 GZIP, 2 ZLIB
 * @param avoidPrecisionLoss - true as default, set it as false if dont need to avoid precission loss
 * @returns keyList
 * @throws if data string cannot be decoded, decompressed or parsed
 */
export function parseKeyList(data, compression, avoidPrecisionLoss) {
    if (avoidPrecisionLoss === void 0) { avoidPrecisionLoss = true; }
    var binKeyList = decompress(data, compression);
    var strKeyList = Uint8ArrayToString(binKeyList);
    // replace numbers to strings, to avoid losing precision
    if (avoidPrecisionLoss)
        strKeyList = strKeyList.replace(/\d+/g, '"$&"');
    return JSON.parse(strKeyList);
}
/**
 * Decode, decompress and parse the provided 'data' into a Bitmap object
 *
 * @param data - base64 encoded string
 * @param compression - 1 GZIP, 2 ZLIB
 * @returns Bitmap
 * @throws if data string cannot be decoded or decompressed
 */
export function parseBitmap(data, compression) {
    return decompress(data, compression);
}
/**
 * Check if the 'bitmap' bit at 'hash64hex' position is 1
 *
 * @param bitmap - Uint8Array bitmap
 * @param hash64hex - 16-chars string, representing a number in hexa
 * @returns whether the provided 'hash64hex' index is set in the bitmap
 */
export function isInBitmap(bitmap, hash64hex) {
    // using the lowest 32 bits as index, to avoid losing precision when converting to number
    var index = parseInt(hash64hex.slice(8), 16) % (bitmap.length * 8);
    var internal = Math.floor(index / 8);
    var offset = index % 8;
    return (bitmap[internal] & 1 << offset) > 0;
}
/**
 * Parse feature flags notifications for instant feature flag updates
 */
export function parseFFUpdatePayload(compression, data) {
    return compression > 0 ?
        parseKeyList(data, compression, false) :
        JSON.parse(decodeFromBase64(data));
}
var DEFAULT_MAX_INTERVAL = 60000;
export function getDelay(parsedData, matchingKey) {
    if (parsedData.h === 0)
        return 0;
    var interval = parsedData.i || DEFAULT_MAX_INTERVAL;
    var seed = parsedData.s || 0;
    return hash(matchingKey, seed) % interval;
}