feat: convert wake-on-lan into a plugin (B20)

plugins/wake-on-lan/src/backend/index.ts

@@ -0,0 +1,15 @@
+import type { Router } from "express";
+import type { PluginContext } from "@termix/plugin-sdk/backend";
+import { createWakeOnLanService } from "./service.js";
+import { registerWakeOnLanRoutes } from "./routes.js";
+
+export async function activate(ctx: PluginContext) {
+  const service = createWakeOnLanService(ctx);
+  ctx.services.provide("wake-on-lan.send", service);
+  registerWakeOnLanRoutes(ctx.http.router<Router>(), ctx, service);
+  ctx.log.info("Wake-on-LAN routes mounted at /plugin-api/wake-on-lan");
+}
+
+export async function deactivate() {
+  // Everything above was registered through ctx and is disposed by core.
+}

plugins/wake-on-lan/src/backend/magic-packet.ts

@@ -0,0 +1,49 @@
+import dgram from "dgram";
+
+const MAC_REGEX = /^([0-9A-Fa-f]{2}[:-]){5}[0-9A-Fa-f]{2}$/;
+
+function parseMac(mac: string): Buffer {
+  return Buffer.from(mac.replace(/[:-]/g, ""), "hex");
+}
+
+export function buildMagicPacket(mac: string): Buffer {
+  const macBytes = parseMac(mac);
+  const packet = Buffer.alloc(102);
+  packet.fill(0xff, 0, 6);
+  for (let i = 0; i < 16; i++) {
+    macBytes.copy(packet, 6 + i * 6);
+  }
+  return packet;
+}
+
+export function isValidMac(mac: string): boolean {
+  return MAC_REGEX.test(mac);
+}
+
+export function sendMagicPacket(
+  mac: string,
+  broadcastAddress = "255.255.255.255",
+): Promise<void> {
+  return new Promise((resolve, reject) => {
+    if (!isValidMac(mac)) {
+      return reject(new Error("Invalid MAC address"));
+    }
+
+    const packet = buildMagicPacket(mac);
+    const socket = dgram.createSocket("udp4");
+
+    socket.once("error", (err) => {
+      socket.close();
+      reject(err);
+    });
+
+    socket.bind(() => {
+      socket.setBroadcast(true);
+      socket.send(packet, 0, packet.length, 9, broadcastAddress, (err) => {
+        socket.close();
+        if (err) reject(err);
+        else resolve();
+      });
+    });
+  });
+}

plugins/wake-on-lan/src/backend/routes.ts

@@ -0,0 +1,47 @@
+import type { Request, Response, Router } from "express";
+import type { PluginContext } from "@termix/plugin-sdk/backend";
+import type { WakeOnLanV1 } from "./service.js";
+
+export function registerWakeOnLanRoutes(
+  router: Router,
+  ctx: PluginContext,
+  service: WakeOnLanV1,
+): void {
+  router.use(ctx.rbac.require("send") as never);
+
+  /**
+   * @openapi
+   * /plugin-api/wake-on-lan/host/{id}/wake:
+   *   post:
+   *     summary: Send a Wake-on-LAN magic packet to a host
+   *     tags:
+   *       - Wake-on-LAN
+   *     parameters:
+   *       - in: path
+   *         name: id
+   *         required: true
+   *         schema:
+   *           type: integer
+   *     responses:
+   *       200:
+   *         description: Packet sent
+   *       400:
+   *         description: No valid MAC address configured
+   *       404:
+   *         description: Host not found
+   */
+  router.post("/host/:id/wake", async (req: Request, res: Response) => {
+    const hostId = Number.parseInt(String(req.params.id), 10);
+    if (!Number.isInteger(hostId)) {
+      return res.status(400).json({ error: "Invalid host id" });
+    }
+    try {
+      await service.wake(hostId);
+      res.json({ success: true });
+    } catch (error) {
+      const message = error instanceof Error ? error.message : String(error);
+      const status = message === "Host not found" ? 404 : 400;
+      res.status(status).json({ error: message });
+    }
+  });
+}

plugins/wake-on-lan/src/backend/service.ts

@@ -0,0 +1,33 @@
+import type { PluginContext } from "@termix/plugin-sdk/backend";
+import { isValidMac, sendMagicPacket } from "./magic-packet.js";
+
+export interface WakeOnLanV1 {
+  wake: (hostId: number) => Promise<void>;
+}
+
+export function createWakeOnLanService(ctx: PluginContext): WakeOnLanV1 {
+  return {
+    async wake(hostId: number): Promise<void> {
+      const host = await ctx.hosts.get(hostId);
+      if (!host) {
+        throw new Error("Host not found");
+      }
+
+      const macAddress = await ctx.settings.getHost<string>(
+        hostId,
+        "macAddress",
+      );
+      if (!macAddress || !isValidMac(macAddress)) {
+        throw new Error("No valid MAC address configured");
+      }
+      const broadcastAddress = await ctx.settings.getHost<string>(
+        hostId,
+        "broadcastAddress",
+      );
+
+      await ctx.capabilities.require("network:broadcast");
+      await sendMagicPacket(macAddress, broadcastAddress || undefined);
+      ctx.log.info(`Wake-on-LAN packet sent to host ${hostId}`);
+    },
+  };
+}