Migrate Slowmode to new Plugin structure

backend/src/plugins/Slowmode/util/onMessageCreate.ts

@@ -0,0 +1,42 @@
+import { SavedMessage } from "src/data/entities/SavedMessage";
+import { GuildChannel, TextChannel } from "eris";
+import { PluginData } from "knub";
+import { SlowmodePluginType } from "../types";
+import { resolveMember } from "src/utils";
+import { applyBotSlowmodeToUserId } from "./applyBotSlowmodeToUserId";
+import { hasPermission } from "src/pluginUtils";
+
+export async function onMessageCreate(pluginData: PluginData<SlowmodePluginType>, msg: SavedMessage) {
+  if (msg.is_bot) return;
+
+  const channel = pluginData.guild.channels.get(msg.channel_id) as GuildChannel & TextChannel;
+  if (!channel) return;
+
+  // Don't apply slowmode if the lock was interrupted earlier (e.g. the message was caught by word filters)
+  const thisMsgLock = await pluginData.locks.acquire(`message-${msg.id}`);
+  if (thisMsgLock.interrupted) return;
+
+  // Check if this channel even *has* a bot-maintained slowmode
+  const channelSlowmode = await pluginData.state.slowmodes.getChannelSlowmode(channel.id);
+  if (!channelSlowmode) return thisMsgLock.unlock();
+
+  // Make sure this user is affected by the slowmode
+  const member = await resolveMember(pluginData.client, pluginData.guild, msg.user_id);
+  const isAffected = hasPermission(pluginData, "is_affected", { channelId: channel.id, userId: msg.user_id, member });
+  if (!isAffected) return thisMsgLock.unlock();
+
+  // Delete any extra messages sent after a slowmode was already applied
+  const userHasSlowmode = await pluginData.state.slowmodes.userHasSlowmode(channel.id, msg.user_id);
+  if (userHasSlowmode) {
+    const message = await channel.getMessage(msg.id);
+    if (message) {
+      message.delete();
+      return thisMsgLock.interrupt();
+    }
+
+    return thisMsgLock.unlock();
+  }
+
+  await applyBotSlowmodeToUserId(pluginData, channel, msg.user_id);
+  thisMsgLock.unlock();
+}