refactor(helpers): separate functions into files (#667)

* refactor(helpers): separate functions into files

* idk

* idk

src/helpers/webhooks/create_webhook.ts

@@ -0,0 +1,41 @@
+import { RequestManager } from "../../rest/request_manager.ts";
+import {
+  Errors,
+  WebhookCreateOptions,
+  WebhookPayload,
+} from "../../types/mod.ts";
+import { endpoints } from "../../util/constants.ts";
+import { requireBotChannelPermissions } from "../../util/permissions.ts";
+import { urlToBase64 } from "../../util/utils.ts";
+
+/**
+ * Create a new webhook. Requires the MANAGE_WEBHOOKS permission. Returns a webhook object on success. Webhook names follow our naming restrictions that can be found in our Usernames and Nicknames documentation, with the following additional stipulations:
+ *
+ * Webhook names cannot be: 'clyde'
+ */
+export async function createWebhook(
+  channelID: string,
+  options: WebhookCreateOptions,
+) {
+  await requireBotChannelPermissions(channelID, ["MANAGE_WEBHOOKS"]);
+
+  if (
+    // Specific usernames that discord does not allow
+    options.name === "clyde" ||
+    // Character limit checks. [...] checks are because of js unicode length handling
+    [...options.name].length < 2 ||
+    [...options.name].length > 32
+  ) {
+    throw new Error(Errors.INVALID_WEBHOOK_NAME);
+  }
+
+  const result = await RequestManager.post(
+    endpoints.CHANNEL_WEBHOOKS(channelID),
+    {
+      ...options,
+      avatar: options.avatar ? await urlToBase64(options.avatar) : undefined,
+    },
+  );
+
+  return result as WebhookPayload;
+}