fix: normalize base64 decoding for JS library

Author: Marc Baqué

Cargo.lock

@@ -11,7 +11,7 @@ proto:
 build:
 	yarn build
 
-dev: build
+dev: copy_lib build
 	yarn start
 
 test: build

languages/js/Makefile

@@ -1,68 +1,7 @@
-const p = "=";
-const tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
-
 export const base64ToBytes = (base64: string): Uint8Array => {
-  //	summary
-  //	Convert a base64-encoded string to an array of bytes
-  var s = base64.split(""),
-    out = [];
-  var l = s.length;
-  while (s[--l] === p) {} //	strip off trailing padding
-  for (var i = 0; i < l; ) {
-    var t = tab.indexOf(s[i++]) << 18;
-    if (i <= l) {
-      t |= tab.indexOf(s[i++]) << 12;
-    }
-    if (i <= l) {
-      t |= tab.indexOf(s[i++]) << 6;
-    }
-    if (i <= l) {
-      t |= tab.indexOf(s[i++]);
-    }
-    out.push((t >>> 16) & 0xff);
-    out.push((t >>> 8) & 0xff);
-    out.push(t & 0xff);
-  }
-  //	strip off any null bytes
-  while (out[out.length - 1] === 0) {
-    out.pop();
-  }
-  return new Uint8Array(out); //	byte[]
+  return new Uint8Array(Buffer.from(base64, "base64"));
 };
 
 export const bytesToBase64 = (bytes: Uint8Array): string => {
-  //	summary
-  //	Encode an array of bytes as a base64-encoded string
-  var t;
-  var s = [],
-    l = bytes.length;
-  var rm = l % 3;
-  var x = l - rm;
-  for (var i = 0; i < x; ) {
-    t = (bytes[i++] << 16) | (bytes[i++] << 8) | bytes[i++];
-    s.push(tab.charAt((t >>> 18) & 0x3f));
-    s.push(tab.charAt((t >>> 12) & 0x3f));
-    s.push(tab.charAt((t >>> 6) & 0x3f));
-    s.push(tab.charAt(t & 0x3f));
-  }
-  //	deal with trailers, based on patch from Peter Wood.
-  switch (rm) {
-    case 2: {
-      t = (bytes[i++] << 16) | (bytes[i++] << 8);
-      s.push(tab.charAt((t >>> 18) & 0x3f));
-      s.push(tab.charAt((t >>> 12) & 0x3f));
-      s.push(tab.charAt((t >>> 6) & 0x3f));
-      s.push(p);
-      break;
-    }
-    case 1: {
-      t = bytes[i++] << 16;
-      s.push(tab.charAt((t >>> 18) & 0x3f));
-      s.push(tab.charAt((t >>> 12) & 0x3f));
-      s.push(p);
-      s.push(p);
-      break;
-    }
-  }
-  return s.join(""); //	string
+  return Buffer.from(bytes).toString("base64")
 };