Modularize server into multiple files

server/helper.js

@@ -0,0 +1,65 @@
+import crypto from "crypto";
+
+export const hasher = (() => {
+    let password;
+    return {
+        hashCodeSalted(salt) {
+            if (!password) {
+                // password is created on first call.
+                password = randomizer.getRandomString(128);
+            }
+
+            return crypto.createHash("sha3-512")
+                .update(password)
+                .update(crypto.createHash("sha3-512").update(salt, "utf8").digest("hex"))
+                .digest("hex");
+        }
+    }
+})()
+
+export const randomizer = (() => {
+    let charCodeLettersOnly = r => 65 <= r && r <= 90;
+    let charCodeAllPrintableChars = r => r === 45 || 47 <= r && r <= 57 || 64 <= r && r <= 90 || 97 <= r && r <= 122;
+
+    return {
+        getRandomString(length, lettersOnly = false) {
+            const charCodeCondition = lettersOnly
+                ? charCodeLettersOnly
+                : charCodeAllPrintableChars;
+
+            let string = "";
+            while (string.length < length) {
+                let arr = new Uint16Array(length);
+                crypto.webcrypto.getRandomValues(arr);
+                arr = Array.apply([], arr); /* turn into non-typed array */
+                arr = arr.map(function (r) {
+                    return r % 128
+                })
+                arr = arr.filter(function (r) {
+                    /* strip non-printables: if we transform into desirable range we have a probability bias, so I suppose we better skip this character */
+                    return charCodeCondition(r);
+                });
+                string += String.fromCharCode.apply(String, arr);
+            }
+            return string.substring(0, length)
+        }
+    }
+})()
+
+/*
+    cyrb53 (c) 2018 bryc (github.com/bryc)
+    A fast and simple hash function with decent collision resistance.
+    Largely inspired by MurmurHash2/3, but with a focus on speed/simplicity.
+    Public domain. Attribution appreciated.
+*/
+export const cyrb53 = function(str, seed = 0) {
+    let h1 = 0xdeadbeef ^ seed, h2 = 0x41c6ce57 ^ seed;
+    for (let i = 0, ch; i < str.length; i++) {
+        ch = str.charCodeAt(i);
+        h1 = Math.imul(h1 ^ ch, 2654435761);
+        h2 = Math.imul(h2 ^ ch, 1597334677);
+    }
+    h1 = Math.imul(h1 ^ (h1>>>16), 2246822507) ^ Math.imul(h2 ^ (h2>>>13), 3266489909);
+    h2 = Math.imul(h2 ^ (h2>>>16), 2246822507) ^ Math.imul(h1 ^ (h1>>>13), 3266489909);
+    return 4294967296 * (2097151 & h2) + (h1>>>0);
+};