Kyle Carberry 3495cad133 fix: resolve localhost URLs in markdown with correct port and protocol (#23513)
## Summary

Fixes several bugs in the markdown URL transform that replaces
`localhost` URLs with workspace port-forward URLs in the AI agent chat.

## Bugs Fixed

### 1. URLs without an explicit port produce `NaN` in the subdomain
When an LLM outputs a URL like `http://localhost/path` (no port),
`parsed.port` is the empty string `""`. `parseInt("", 10)` returns
`NaN`, producing a broken URL like:
```
http://NaN--agent--workspace--user.proxy.example.com/path
```
Now defaults to port 80 for HTTP and 443 for HTTPS via the new
`resolveLocalhostPort()` helper.

### 2. Protocol always hardcoded to `"http"`
The `urlTransform` in `AgentDetail.tsx` always passed `"http"` as the
protocol argument, silently discarding the original URL's scheme. This
meant `https://localhost:8443/...` would not get the `s` suffix in the
subdomain. Now extracts the protocol from the parsed URL, matching the
existing behavior of `openMaybePortForwardedURL`.

### 3. `urlTransform` not memoized
The closure was re-created on every render. Wrapped in `useCallback`
with the four primitive dependencies (`proxyHost`, `agentName`,
`wsName`, `wsOwner`).

### 4. Duplicated `localHosts` definition
The localhost detection set was defined separately in both
`AgentDetail.tsx` and `portForward.ts`. Consolidated into a single
shared export from `portForward.ts`.

## Changes

- **`site/src/utils/portForward.ts`**: Export shared `localHosts` set
and new `resolveLocalhostPort()` helper. Update
`openMaybePortForwardedURL` to use both.
- **`site/src/pages/AgentsPage/AgentDetail.tsx`**: Import shared
`localHosts` and `resolveLocalhostPort`. Fix protocol extraction.
Memoize `urlTransform`.
- **`site/src/utils/portForward.jest.ts`**: Add tests for
`resolveLocalhostPort` and `localHosts`. Renamed from `.test.ts` to
`.jest.ts` to match project convention.
2026-03-24 15:01:33 -04:00
2022-04-04 11:55:06 -05:00

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