feat: Add support for Automated Message nonce handling

packages/discord.js/src/client/Client.js

@@ -535,6 +535,9 @@ class Client extends BaseClient {
     if (typeof options.failIfNotExists !== 'boolean') {
       throw new DiscordjsTypeError(ErrorCodes.ClientInvalidOption, 'failIfNotExists', 'a boolean');
     }
+    if (typeof options.enforceNonce !== 'boolean') {
+      throw new DiscordjsTypeError(ErrorCodes.ClientInvalidOption, 'enforceNonce', 'a boolean');
+    }
     if (
       (typeof options.allowedMentions !== 'object' && options.allowedMentions !== undefined) ||
       options.allowedMentions === null

packages/discord.js/src/structures/MessagePayload.js

@@ -2,6 +2,7 @@
 
 const { Buffer } = require('node:buffer');
 const { lazy, isJSONEncodable } = require('@discordjs/util');
+const { DiscordSnowflake } = require('@sapphire/snowflake');
 const { MessageFlags } = require('discord-api-types/v10');
 const ActionRowBuilder = require('./ActionRowBuilder');
 const { DiscordjsError, DiscordjsRangeError, ErrorCodes } = require('../errors');
@@ -133,9 +134,17 @@ class MessagePayload {
       }
     }
 
-    const enforce_nonce = Boolean(this.options.enforceNonce);
-    if (enforce_nonce && nonce === undefined) {
-      throw new DiscordjsError(ErrorCodes.MessageNonceRequired);
+    let enforce_nonce = Boolean(this.options.enforceNonce);
+
+    // If `nonce` isn't provided, generate one & set `enforceNonce`
+    // Unless `enforceNonce` is explicitly set to `false`(not just falsy)
+    if (nonce === undefined) {
+      if (this.options.enforceNonce !== false && this.client.options.enforceNonce) {
+        nonce = DiscordSnowflake.generate().toString();
+        enforce_nonce = true;
+      } else if (enforce_nonce) {
+        throw new DiscordjsError(ErrorCodes.MessageNonceRequired);
+      }
     }
 
     const components = this.options.components?.map(component =>

packages/discord.js/src/util/Options.js

@@ -41,6 +41,7 @@ const { version } = require('../../package.json');
  * @property {WebsocketOptions} [ws] Options for the WebSocket
  * @property {RESTOptions} [rest] Options for the REST manager
  * @property {Function} [jsonTransformer] A function used to transform outgoing json data
+ * @property {boolean} [enforceNonce=false] The default value for {@link MessageReplyOptions#enforceNonce}
  */
 
 /**
@@ -117,6 +118,7 @@ class Options extends null {
       makeCache: this.cacheWithLimits(this.DefaultMakeCacheSettings),
       partials: [],
       failIfNotExists: true,
+      enforceNonce: false,
       presence: {},
       sweepers: this.DefaultSweeperSettings,
       ws: {

packages/discord.js/typings/index.d.ts

@@ -5311,6 +5311,7 @@ export interface ClientOptions {
   ws?: WebSocketOptions;
   rest?: Partial<RESTOptions>;
   jsonTransformer?: (obj: unknown) => unknown;
+  enforceNonce?: boolean;
 }
 
 export type ClientPresenceStatus = 'online' | 'idle' | 'dnd';