Charlie Voiselle d3c9469e13 fix: open coder_app links in new tab when open_in is tab (#23000)
Fixes #18573

## Changes

When a `coder_app` resource sets `open_in = "tab"`, clicking the app
link now opens in a new browser tab instead of navigating in the same
tab.

`target="_blank"` and `rel="noreferrer"` are set inline on the
`<a>` elements in `AppLink.tsx`, gated on `app.open_in === "tab"`. This
follows the codebase convention of co-locating `target` and `rel` at the
render site.

`noreferrer` suppresses the Referer header to avoid leaking workspace IDs
to destination servers and implies `noopener`.
`noopener` prevents tabnabbing — without it, the opened page can
redirect the Coder dashboard tab via `window.opener`. This is especially
relevant for same-origin path-based apps, which would otherwise have
full DOM access to the dashboard. 

> **Future enhancement**: template admins could opt into sending the
referrer via a `coder_app` setting, enabling feedback pages built around
workspace context.

## Tests

A vitest case is added in `AppLink.test.tsx` (rather than a Storybook
story, since the assertions are purely behavioral with no visual
component):

- **`sets target=_blank and rel=noopener noreferrer when open_in is
tab`** — renders the app link with `open_in: "tab"` and asserts
`target="_blank"` and `rel="noreferrer"` are present on the
anchor.

## Slim-window behavior

The `slim-window` test case and the `openAppInNewWindow()` comment in
`apps.ts` have been split out into a follow-up PR for separate review,
since the `window.open()` / `noopener` tradeoffs there deserve dedicated
discussion.

---------

Co-authored-by: Kayla はな <kayla@tree.camp>
2026-03-17 15:32:45 -04:00
2026-03-17 11:41:10 +00:00
2026-03-17 11:41:10 +00:00
2022-04-04 11:55:06 -05:00

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