Use libsodium.js if available (#1390)

* Use libsodium.js if available

* Style consistency

* Added peer dep and update README

* Link should point to npmjs 🤔

README.md

@@ -41,7 +41,9 @@ For production bots, using node-opus should be considered a necessity, especiall
 ### Optional packages
 - [bufferutil](https://www.npmjs.com/package/bufferutil) to greatly speed up the WebSocket when *not* using uws (`npm install bufferutil --save`)
 - [erlpack](https://github.com/hammerandchisel/erlpack) for significantly faster WebSocket data (de)serialisation (`npm install hammerandchisel/erlpack --save`)
-- [sodium](https://www.npmjs.com/package/sodium) for faster voice packet encryption/decryption (`npm install sodium --save`)
+- for faster voice packet encryption/decryption you can install one of the following:
+    - [sodium](https://www.npmjs.com/package/sodium) (`npm install sodium --save`)
+    - [libsodium.js](https://www.npmjs.com/package/libsodium-wrappers) (`npm install libsodium-wrappers --save`)
 - [uws](https://www.npmjs.com/package/uws) for a much faster WebSocket connection (`npm install uws --save`)  
   **Note:** This package does not handle disconnects entirely correctly, which causes automatic reconnection to Discord to not function.
   If you use this package, it may be wise to destroy + recreate the client entirely or restart the process upon disconnect.

package.json

@@ -45,7 +45,8 @@
     "node-opus": "^0.2.5",
     "opusscript": "^0.0.3",
     "sodium": "^2.0.1",
-    "uws": "^0.14.1"
+    "uws": "^0.14.1",
+    "libsodium-wrappers": "^0.5.1"
   },
   "devDependencies": {
     "discord.js-docgen": "hydrabolt/discord.js-docgen",

src/client/voice/util/Secretbox.js

@@ -1,13 +1,22 @@
-try {
-  const sodium = require('sodium');
-  module.exports = {
+const libs = {
+  sodium: sodium => ({
     open: sodium.api.crypto_secretbox_open_easy,
     close: sodium.api.crypto_secretbox_easy,
-  };
-} catch (err) {
-  const tweetnacl = require('tweetnacl');
-  module.exports = {
+  }),
+  'libsodium-wrappers': sodium => ({
+    open: sodium.crypto_secretbox_open_easy,
+    close: sodium.crypto_secretbox_easy,
+  }),
+  tweetnacl: tweetnacl => ({
     open: tweetnacl.secretbox.open,
     close: tweetnacl.secretbox,
-  };
+  }),
+};
+
+for (const libName of Object.keys(libs)) {
+  try {
+    const lib = require(libName);
+    module.exports = libs[libName](lib);
+    break;
+  } catch (err) {} // eslint-disable-line no-empty
 }