feat(keyclaok-apps): use sub for matrix localpart

dockerfiles/keycloak-apps/mappers/matrix-localpart.js

@@ -1,5 +1,81 @@
-String.prototype.customConvertion=function(){
-    return this.replace(/@/,'-');
+function convertBase(str, fromBase, toBase) {
+  var DIGITS = "0123456789abcdefghijklmnopqrstuvwxyz";
+
+  var add = function add(x, y, base) {
+    var z = [];
+    var n = Math.max(x.length, y.length);
+    var carry = 0;
+    var i = 0;
+
+    while (i < n || carry) {
+      var xi = i < x.length ? x[i] : 0;
+      var yi = i < y.length ? y[i] : 0;
+      var zi = carry + xi + yi;
+      z.push(zi % base);
+      carry = Math.floor(zi / base);
+      i++;
+    }
+
+    return z;
+  };
+
+  var multiplyByNumber = function multiplyByNumber(num, x, base) {
+    if (num < 0) return null;
+    if (num == 0) return [];
+    var result = [];
+    var power = x;
+
+    while (true) {
+      num & 1 && (result = add(result, power, base));
+      num = num >> 1;
+      if (num === 0) break;
+      power = add(power, power, base);
+    }
+
+    return result;
+  };
+
+  var parseToDigitsArray = function parseToDigitsArray(str, base) {
+    var digits = str.split('');
+    var arr = [];
+
+    for (var i = digits.length - 1; i >= 0; i--) {
+      var n = DIGITS.indexOf(digits[i]);
+      if (n == -1) return null;
+      arr.push(n);
+    }
+
+    return arr;
+  };
+
+  var digits = parseToDigitsArray(str, fromBase);
+  if (digits === null) return null;
+  var outArray = [];
+  var power = [1];
+
+  for (var i = 0; i < digits.length; i++) {
+    digits[i] && (outArray = add(outArray, multiplyByNumber(digits[i], power, toBase), toBase));
+    power = multiplyByNumber(fromBase, power, toBase);
+  }
+
+  var out = '';
+
+  for (var _i = outArray.length - 1; _i >= 0; _i--) {
+    out += DIGITS[outArray[_i]];
+  }
+
+  return out;
 }
 
-exports = user.getUsername().customConvertion()
+// sub is a uuid v4
+// https://www.uuidgenerator.net/version4
+// of the form:
+// 082adaca-540a-4a80-9354-d6607d28300c
+// remove `-`
+// 082adaca540a4a809354d6607d28300c
+// take last 16 chars (which is RandC + a var) - https://datatracker.ietf.org/doc/html/rfc9562#uuidv4fields
+// 9354d6607d28300c
+// convert it to base36
+// 28nosjs1wcj64
+
+exports = convertBase(uuid.replace(/-/gi, '').slice(-16), 16, 36);