Add plugin system

src/node/plugin.ts

@@ -0,0 +1,52 @@
+import { field, logger } from "@coder/logger"
+import * as fs from "fs"
+import * as path from "path"
+import * as util from "util"
+import { Args } from "./cli"
+import { HttpServer } from "./http"
+
+/* eslint-disable @typescript-eslint/no-var-requires */
+
+export type Activate = (httpServer: HttpServer, args: Args) => void
+
+export interface Plugin {
+  activate: Activate
+}
+
+const originalLoad = require("module")._load
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+require("module")._load = function (request: string, parent: object, isMain: boolean): any {
+  return originalLoad.apply(this, [request.replace(/^code-server/, path.resolve(__dirname, "../..")), parent, isMain])
+}
+
+const loadPlugin = async (pluginPath: string, httpServer: HttpServer, args: Args): Promise<void> => {
+  try {
+    const plugin: Plugin = require(pluginPath)
+    plugin.activate(httpServer, args)
+    logger.debug("Loaded plugin", field("name", path.basename(pluginPath)))
+  } catch (error) {
+    if (error.code !== "MODULE_NOT_FOUND") {
+      logger.warn(error.message)
+    } else {
+      logger.debug(error.message)
+    }
+  }
+}
+
+const _loadPlugins = async (httpServer: HttpServer, args: Args): Promise<void> => {
+  const pluginPath = path.resolve(__dirname, "../../plugins")
+  const files = await util.promisify(fs.readdir)(pluginPath, {
+    withFileTypes: true,
+  })
+  await Promise.all(files.map((file) => loadPlugin(path.join(pluginPath, file.name), httpServer, args)))
+}
+
+export const loadPlugins = async (httpServer: HttpServer, args: Args): Promise<void> => {
+  try {
+    await _loadPlugins(httpServer, args)
+  } catch (error) {
+    if (error.code !== "ENOENT") {
+      logger.warn(error.message)
+    }
+  }
+}