feat: use webhooks for logs when possible

backend/src/plugins/InternalPoster/functions/getOrCreateWebhookForChannel.ts

@@ -0,0 +1,48 @@
+import { GuildPluginData } from "knub";
+import { InternalPosterPluginType } from "../types";
+import { NewsChannel, Permissions, TextChannel } from "discord.js";
+import { isDiscordAPIError } from "../../../utils";
+
+type WebhookInfo = [id: string, token: string];
+
+export async function getOrCreateWebhookForChannel(
+  pluginData: GuildPluginData<InternalPosterPluginType>,
+  channel: TextChannel | NewsChannel,
+): Promise<WebhookInfo | null> {
+  // tslint:disable-next-line:no-console FIXME: Here for debugging purposes
+  console.log(`getOrCreateWebhookForChannel(${channel.id})`);
+
+  // Database cache
+  const fromDb = await pluginData.state.webhooks.findByChannelId(channel.id);
+  if (fromDb) {
+    return [fromDb.id, fromDb.token];
+  }
+
+  if (pluginData.state.missingPermissions) {
+    return null;
+  }
+
+  // Create new webhook
+  const member = pluginData.client.user && pluginData.guild.members.cache.get(pluginData.client.user.id);
+  if (!member || member.permissions.has(Permissions.FLAGS.MANAGE_WEBHOOKS)) {
+    try {
+      const webhook = await channel.createWebhook(`Zephook ${channel.id}`);
+      await pluginData.state.webhooks.create({
+        id: webhook.id,
+        guild_id: pluginData.guild.id,
+        channel_id: channel.id,
+        token: webhook.token!,
+      });
+      return [webhook.id, webhook.token!];
+    } catch (err) {
+      if (isDiscordAPIError(err) && err.code === 50013) {
+        pluginData.state.missingPermissions = true;
+        console.warn(`Error ${err.code} when trying to create webhook for ${pluginData.guild.id}`);
+        return null;
+      }
+      throw err;
+    }
+  }
+
+  return null;
+}