Add /rfd/slug/raw for getting raw asciidoc

app/routes/rfd.$slug.raw.tsx

@@ -0,0 +1,54 @@
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * Copyright Oxide Computer Company
+ */
+
+import { RfdWithRaw } from '@oxide/rfd.ts/client'
+import { redirect, type LoaderFunctionArgs } from 'react-router'
+
+import { authenticate } from '~/services/auth.server'
+import { fetchLocalRfd, isLocalMode, LocalRfd } from '~/services/rfd.local.server'
+import { fetchRemoteRfd } from '~/services/rfd.remote.server'
+import { parseRfdNum } from '~/utils/parseRfdNum'
+
+import { resp404 } from './rfd.$slug'
+
+export async function loader({ request, params: { slug } }: LoaderFunctionArgs) {
+  const num = parseRfdNum(slug)
+  if (!num) throw resp404()
+
+  const user = await authenticate(request)
+  let rfd: LocalRfd | RfdWithRaw | undefined
+
+  // We're replicating some functionality from `fetchRfd` but here we just
+  // want the raw content and I don't want to bloat the returned object
+  try {
+    if (isLocalMode()) {
+      const localRfd = fetchLocalRfd(num)
+      rfd = localRfd
+    } else {
+      const remoteRfd = await fetchRemoteRfd(num, user)
+      rfd = remoteRfd
+    }
+  } catch (err) {
+    console.error('Failed to fetch RFD', err)
+    throw resp404()
+  }
+
+  // If someone goes to a private RFD but they're not logged in, they will
+  // want to log in and see it.
+  if (!rfd && !user) throw redirect(`/login?returnTo=/rfd/${num}`)
+
+  // If you don't see an RFD but you are logged in, you can't tell whether you
+  // don't have access or it doesn't exist. That's fine.
+  if (!rfd) throw resp404()
+
+  return new Response(rfd.content, {
+    headers: {
+      'Content-Type': 'text/plain; charset=utf-8',
+    },
+  })
+}