statsig-js
Version:
Statsig JavaScript client SDK for single user environments.
85 lines (84 loc) • 2.93 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.getUserCacheKey = exports.getSortedObject = exports.djb2HashForObject = exports.sha256Hash = exports.djb2Hash = exports.memoizedUserCacheKeyHash = exports.fasthash = void 0;
var Base64_1 = require("./Base64");
var js_sha256_1 = require("js-sha256");
var hashLookupTable = {};
function fasthash(value) {
var hash = 0;
for (var i = 0; i < value.length; i++) {
var character = value.charCodeAt(i);
hash = (hash << 5) - hash + character;
hash = hash & hash; // Convert to 32bit integer
}
return hash;
}
exports.fasthash = fasthash;
// Keeping this around to prevent busting existing caches
// This is just the same as djb2Hash but it can have negative values
function memoizedUserCacheKeyHash(value) {
var seen = hashLookupTable[value];
if (seen) {
return seen;
}
var hash = String(fasthash(value));
hashLookupTable[value] = hash;
return hash;
}
exports.memoizedUserCacheKeyHash = memoizedUserCacheKeyHash;
function djb2Hash(value) {
return String(fasthash(value) >>> 0);
}
exports.djb2Hash = djb2Hash;
function sha256Hash(value) {
var seen = hashLookupTable[value];
if (seen) {
return seen;
}
var buffer = js_sha256_1.sha256.create().update(value).arrayBuffer();
var hash = Base64_1.Base64.encodeArrayBuffer(buffer);
hashLookupTable[value] = hash;
return hash;
}
exports.sha256Hash = sha256Hash;
function djb2HashForObject(object) {
return djb2Hash(JSON.stringify(getSortedObject(object)));
}
exports.djb2HashForObject = djb2HashForObject;
function getSortedObject(object) {
if (object == null) {
return null;
}
var keys = Object.keys(object).sort();
var sortedObject = {};
keys.forEach(function (key) {
var value = object[key];
if (value instanceof Object) {
value = getSortedObject(value);
}
sortedObject[key] = value;
});
return sortedObject;
}
exports.getSortedObject = getSortedObject;
function getUserCacheKey(stableID, user, sdkKey) {
var _a;
var parts = ["userID:" + String((_a = user === null || user === void 0 ? void 0 : user.userID) !== null && _a !== void 0 ? _a : '')];
var customIDs = user === null || user === void 0 ? void 0 : user.customIDs;
if (customIDs != null) {
for (var _i = 0, _b = Object.entries(customIDs); _i < _b.length; _i++) {
var _c = _b[_i], type = _c[0], value = _c[1];
parts.push(type + ":" + value);
}
}
var v2 = memoizedUserCacheKeyHash(parts.join(';'));
var v3 = memoizedUserCacheKeyHash(parts.join(';') + (";sdkKey:" + sdkKey));
parts.splice(1, 0, "stableID:" + stableID);
var v1 = memoizedUserCacheKeyHash(parts.join(';'));
return {
v1: v1,
v2: v2,
v3: v3,
};
}
exports.getUserCacheKey = getUserCacheKey;