feat(WebhookClient): allow creation of clients via URLs

src/client/WebhookClient.js

@@ -1,6 +1,7 @@
 'use strict';
 
 const BaseClient = require('./BaseClient');
+const { Error } = require('../errors');
 const Webhook = require('../structures/Webhook');
 
 /**
@@ -10,17 +11,37 @@ const Webhook = require('../structures/Webhook');
  */
 class WebhookClient extends BaseClient {
   /**
-   * @param {Snowflake} id The webhook's id
-   * @param {string} token Token of the webhook
+   * The data for the webhook client containing either an id and token or just a URL
+   * @typedef {Object} WebhookClientData
+   * @property {Snowflake} [id] The id of the webhook
+   * @property {string} [token] The token of the webhook
+   * @property {string} [url] The full url for the webhook client
+   */
+
+  /**
+   * @param {WebhookClientData} data The data of the webhook
    * @param {ClientOptions} [options] Options for the client
    * @example
    * // Create a new webhook and send a message
-   * const hook = new Discord.WebhookClient('1234', 'abcdef');
+   * const hook = new Discord.WebhookClient({ id: '1234', token: 'abcdef' });
    * hook.send('This will send a message').catch(console.error);
    */
-  constructor(id, token, options) {
+  constructor(data, options) {
     super(options);
     Object.defineProperty(this, 'client', { value: this });
+    let { id, token } = data;
+
+    if ('url' in data) {
+      const url = data.url.match(
+        // eslint-disable-next-line no-useless-escape
+        /^https?:\/\/(?:canary|ptb)?\.?discord\.com\/api\/webhooks(?:\/v[0-9]\d*)?\/([^\/]+)\/([^\/]+)/i,
+      );
+
+      if (!url || url.length <= 1) throw new Error('WEBHOOK_URL_INVALID');
+
+      [, id, token] = url;
+    }
+
     this.id = id;
     Object.defineProperty(this, 'token', { value: token, writable: true, configurable: true });
   }

src/errors/Messages.js

@@ -101,6 +101,7 @@ const Messages = {
 
   WEBHOOK_MESSAGE: 'The message was not sent by a webhook.',
   WEBHOOK_TOKEN_UNAVAILABLE: 'This action requires a webhook token, but none is available.',
+  WEBHOOK_URL_INVALID: 'The provided webhook URL is not valid.',
   MESSAGE_REFERENCE_MISSING: 'The message does not reference another message',
 
   EMOJI_TYPE: 'Emoji must be a string or GuildEmoji/ReactionEmoji',

test/webhooktest.js

@@ -97,7 +97,7 @@ client.on('messageCreate', async message => {
   if (message.author.id !== owner) return;
   const match = message.content.match(/^do (.+)$/);
   const hooks = [
-    { type: 'WebhookClient', hook: new WebhookClient(webhookChannel, webhookToken) },
+    { type: 'WebhookClient', hook: new WebhookClient({ id: webhookChannel, token: webhookToken }) },
     { type: 'TextChannel#fetchWebhooks', hook: await message.channel.fetchWebhooks().then(x => x.first()) },
     { type: 'Guild#fetchWebhooks', hook: await message.guild.fetchWebhooks().then(x => x.first()) },
   ];

typings/index.d.ts

@@ -1894,7 +1894,7 @@ export class Webhook extends WebhookMixin() {
 }
 
 export class WebhookClient extends WebhookMixin(BaseClient) {
-  public constructor(id: Snowflake, token: string, options?: WebhookClientOptions);
+  public constructor(data: WebhookClientData, options?: WebhookClientOptions);
   public client: this;
   public options: WebhookClientOptions;
   public token: string;
@@ -4340,6 +4340,17 @@ export type VerificationLevel = keyof typeof VerificationLevels;
 
 export type VoiceBasedChannelTypes = 'GUILD_VOICE' | 'GUILD_STAGE_VOICE';
 
+export type WebhookClientData = WebhookClientDataIdWithToken | WebhookClientDataURL;
+
+export interface WebhookClientDataIdWithToken {
+  id: Snowflake;
+  token: string;
+}
+
+export interface WebhookClientDataURL {
+  url: string;
+}
+
 export type WebhookClientOptions = Pick<
   ClientOptions,
   'allowedMentions' | 'restTimeOffset' | 'restRequestTimeout' | 'retryLimit' | 'http'