Migrate Slowmode to new Plugin structure

backend/src/plugins/Slowmode/commands/SlowmodeSetChannelCmd.ts

@@ -0,0 +1,93 @@
+import { commandTypeHelpers as ct } from "../../../commandTypes";
+import { slowmodeCmd } from "../types";
+import { TextChannel } from "eris";
+import humanizeDuration from "humanize-duration";
+import { sendErrorMessage, sendSuccessMessage } from "src/pluginUtils";
+import { convertDelayStringToMS, HOURS, DAYS } from "src/utils";
+import { disableBotSlowmodeForChannel } from "../util/disableBotSlowmodeForChannel";
+import { actualDisableSlowmodeCmd } from "../util/actualDisableSlowmodeCmd";
+
+const NATIVE_SLOWMODE_LIMIT = 6 * HOURS; // 6 hours
+const MAX_SLOWMODE = DAYS * 365 * 100; // 100 years
+
+export const SlowmodeSetChannelCmd = slowmodeCmd({
+  trigger: "slowmode",
+  permission: "can_manage",
+  source: "guild",
+
+  // prettier-ignore
+  signature: [
+    {
+      time: ct.string(),
+    },
+    {
+      channel: ct.textChannel(),
+      time: ct.string(),
+    }
+  ],
+
+  async run({ message: msg, args, pluginData }) {
+    const channel = args.channel || msg.channel;
+
+    if (channel == null || !(channel instanceof TextChannel)) {
+      sendErrorMessage(pluginData, msg.channel, "Channel must be a text channel");
+      return;
+    }
+
+    const seconds = Math.ceil(convertDelayStringToMS(args.time, "s") / 1000);
+    const useNativeSlowmode =
+      pluginData.config.getForChannel(channel).use_native_slowmode && seconds <= NATIVE_SLOWMODE_LIMIT;
+
+    if (seconds === 0) {
+      // Workaround until we can call SlowmodeDisableCmd from here
+      return actualDisableSlowmodeCmd(msg, { channel }, pluginData);
+    }
+
+    if (seconds > MAX_SLOWMODE) {
+      sendErrorMessage(
+        pluginData,
+        msg.channel,
+        `Sorry, slowmodes can be at most 100 years long. Maybe 99 would be enough?`,
+      );
+      return;
+    }
+
+    if (useNativeSlowmode) {
+      // Native slowmode
+
+      // If there is an existing bot-maintained slowmode, disable that first
+      const existingBotSlowmode = await pluginData.state.slowmodes.getChannelSlowmode(channel.id);
+      if (existingBotSlowmode) {
+        await disableBotSlowmodeForChannel(pluginData, channel);
+      }
+
+      // Set slowmode
+      try {
+        await channel.edit({
+          rateLimitPerUser: seconds,
+        });
+      } catch (e) {
+        return sendErrorMessage(pluginData, msg.channel, "Failed to set native slowmode (check permissions)");
+      }
+    } else {
+      // Bot-maintained slowmode
+
+      // If there is an existing native slowmode, disable that first
+      if (channel.rateLimitPerUser) {
+        await channel.edit({
+          rateLimitPerUser: 0,
+        });
+      }
+
+      await pluginData.state.slowmodes.setChannelSlowmode(channel.id, seconds);
+    }
+
+    const humanizedSlowmodeTime = humanizeDuration(seconds * 1000);
+    const slowmodeType = useNativeSlowmode ? "native slowmode" : "bot-maintained slowmode";
+    sendSuccessMessage(
+      pluginData,
+      msg.channel,
+      `Set ${humanizedSlowmodeTime} slowmode for <#${channel.id}> (${slowmodeType})`,
+    );
+  },
+});