client/web: pipe unraid csrf token through apiFetch

Ensures that we're sending back the csrf token for all requests
made back to unraid clients.

Updates tailscale/corp#13775

Signed-off-by: Sonia Appasamy <sonia@tailscale.com>

client/web/src/api.ts

@@ -1,4 +1,5 @@
 let csrfToken: string
+let unraidCsrfToken: string | undefined // required for unraid POST requests (#8062)
 
 // apiFetch wraps the standard JS fetch function with csrf header
 // management and param additions specific to the web client.
@@ -8,11 +9,12 @@ let csrfToken: string
 // (i.e. provide `/data` rather than `api/data`).
 export function apiFetch(
   endpoint: string,
-  init?: RequestInit | undefined,
-  addURLParams?: Record<string, string>
+  method: "GET" | "POST",
+  body?: any,
+  params?: Record<string, string>
 ): Promise<Response> {
   const urlParams = new URLSearchParams(window.location.search)
-  const nextParams = new URLSearchParams(addURLParams)
+  const nextParams = new URLSearchParams(params)
   const token = urlParams.get("SynoToken")
   if (token) {
     nextParams.set("SynoToken", token)
@@ -20,9 +22,28 @@ export function apiFetch(
   const search = nextParams.toString()
   const url = `api${endpoint}${search ? `?${search}` : ""}`
 
+  var contentType: string
+  if (unraidCsrfToken) {
+    const params = new URLSearchParams()
+    params.append("csrf_token", unraidCsrfToken)
+    if (body) {
+      params.append("ts_data", JSON.stringify(body))
+    }
+    body = params.toString()
+    contentType = "application/x-www-form-urlencoded;charset=UTF-8"
+  } else {
+    body = body ? JSON.stringify(body) : undefined
+    contentType = "application/json"
+  }
+
   return fetch(url, {
-    ...init,
-    headers: withCsrfToken(init?.headers),
+    method: method,
+    headers: {
+      Accept: "application/json",
+      "Content-Type": contentType,
+      "X-CSRF-Token": csrfToken,
+    },
+    body,
   }).then((r) => {
     updateCsrfToken(r)
     if (!r.ok) {
@@ -34,13 +55,13 @@ export function apiFetch(
   })
 }
 
-function withCsrfToken(h?: HeadersInit): HeadersInit {
-  return { ...h, "X-CSRF-Token": csrfToken }
-}
-
 function updateCsrfToken(r: Response) {
   const tok = r.headers.get("X-CSRF-Token")
   if (tok) {
     csrfToken = tok
   }
 }
+
+export function setUnraidCsrfToken(token?: string) {
+  unraidCsrfToken = token
+}

client/web/src/components/legacy.tsx

@@ -93,7 +93,7 @@ export function Header({
                   |{" "}
                   <button
                     onClick={() =>
-                      apiFetch("/local/v0/logout", { method: "POST" })
+                      apiFetch("/local/v0/logout", "POST")
                         .then(refreshData)
                         .catch((err) => alert("Logout failed: " + err.message))
                     }

client/web/src/hooks/node-data.ts

@@ -1,5 +1,5 @@
 import { useCallback, useEffect, useState } from "react"
-import { apiFetch } from "src/api"
+import { apiFetch, setUnraidCsrfToken } from "src/api"
 
 export type NodeData = {
   Profile: UserProfile
@@ -37,9 +37,12 @@ export default function useNodeData() {
 
   const refreshData = useCallback(
     () =>
-      apiFetch("/data")
+      apiFetch("/data", "GET")
         .then((r) => r.json())
-        .then((d) => setData(d))
+        .then((d: NodeData) => {
+          setData(d)
+          setUnraidCsrfToken(d.IsUnraid ? d.UnraidToken : undefined)
+        })
         .catch((error) => console.error(error)),
     [setData]
   )
@@ -70,27 +73,7 @@ export default function useNodeData() {
             : data.AdvertiseExitNode,
       }
 
-      var body, contentType: string
-      if (data.IsUnraid) {
-        const params = new URLSearchParams()
-        params.append("csrf_token", data.UnraidToken)
-        params.append("ts_data", JSON.stringify(update))
-        body = params.toString()
-        contentType = "application/x-www-form-urlencoded;charset=UTF-8"
-      } else {
-        body = JSON.stringify(update)
-        contentType = "application/json"
-      }
-
-      apiFetch(
-        "/data",
-        {
-          method: "POST",
-          headers: { Accept: "application/json", "Content-Type": contentType },
-          body: body,
-        },
-        { up: "true" }
-      )
+      apiFetch("/data", "POST", update, { up: "true" })
         .then((r) => r.json())
         .then((r) => {
           setIsPosting(false)