Implement last opened functionality (#4633)

* Implement last opened functionality

Fixes https://github.com/cdr/code-server/issues/4619

* Fix test temp dirs not being cleaned up

* Mock logger everywhere

This suppresses all the error and debug output we generate which makes
it hard to actually find which test has failed.  It also gives us a
standard way to test logging for the few places we do that.

* Use separate data directories for unit test instances

Exactly as we do for the e2e tests.

* Add integration tests for vscode route

* Make settings use --user-data-dir

Without this test instances step on each other feet and they also
clobber your own non-test settings.

* Make redirects consistent

They will preserve the trailing slash if there is one.

* Remove compilation check

If you do a regular non-watch build there are no compilation stats so
this bricks VS Code in CI when running the unit tests.

I am not sure how best to fix this for the case where you have a build
that has not been packaged yet so I just removed it for now and added a
message to check if VS Code is compiling when in dev mode.

* Update code-server update endpoint name

src/node/http.ts

@@ -10,6 +10,8 @@ import { normalize } from "../common/util"
 import { AuthType, DefaultedArgs } from "./cli"
 import { version as codeServerVersion } from "./constants"
 import { Heart } from "./heart"
+import { CoderSettings, SettingsProvider } from "./settings"
+import { UpdateProvider } from "./update"
 import { getPasswordMethod, IsCookieValidArgs, isCookieValid, sanitizeString, escapeHtml, escapeJSON } from "./util"
 
 /**
@@ -29,6 +31,8 @@ declare global {
     export interface Request {
       args: DefaultedArgs
       heart: Heart
+      settings: SettingsProvider<CoderSettings>
+      updater: UpdateProvider
     }
   }
 }
@@ -135,8 +139,8 @@ export const relativeRoot = (originalUrl: string): string => {
 }
 
 /**
- * Redirect relatively to `/${to}`. Query variables on the current URI will be preserved.
- * `to` should be a simple path without any query parameters
+ * Redirect relatively to `/${to}`. Query variables on the current URI will be
+ * preserved.  `to` should be a simple path without any query parameters
  * `override` will merge with the existing query (use `undefined` to unset).
  */
 export const redirect = (
@@ -284,3 +288,10 @@ export const getCookieOptions = (req: express.Request): express.CookieOptions =>
     sameSite: "lax",
   }
 }
+
+/**
+ * Return the full path to the current page, preserving any trailing slash.
+ */
+export const self = (req: express.Request): string => {
+  return normalize(`${req.baseUrl}${req.originalUrl.endsWith("/") ? "/" : ""}`, true)
+}