lets try storing as tmp file again

pages/api/index.ts

@@ -1,17 +1,26 @@
+import os from 'os'
 import { posix as pathPosix } from 'path'
 
 import type { NextApiRequest, NextApiResponse } from 'next'
 import axios from 'axios'
+import Keyv from 'keyv'
+import { KeyvFile } from 'keyv-file'
 
 import apiConfig from '../../config/api.json'
 import siteConfig from '../../config/site.json'
 import { revealObfuscatedToken } from '../../utils/oAuthHandler'
 import { compareHashedToken } from '../../utils/protectedRouteHandler'
-import TokenStore from '../../utils/odAuthTokenStore'
+import { getOdAuthTokens, storeOdAuthTokens } from '../../utils/odAuthTokenStore'
 
 const basePath = pathPosix.resolve('/', siteConfig.baseDirectory)
 const clientSecret = revealObfuscatedToken(apiConfig.obfuscatedClientSecret)
-const tokenStore = new TokenStore()
+
+const keyv = new Keyv({
+  store: new KeyvFile({
+    filename: `${os.tmpdir()}/od-auth-token.json`,
+  }),
+})
+console.log(`kv init - ${os.tmpdir()}/od-auth-token.json`)
 
 const encodePath = (path: string) => {
   let encodedPath = pathPosix.join(basePath, pathPosix.resolve('/', path))
@@ -23,8 +32,7 @@ const encodePath = (path: string) => {
 }
 
 async function getAccessToken(): Promise<any> {
-  const { accessToken, refreshToken } = await tokenStore.getOdAuthTokens()
-  console.log(accessToken, refreshToken)
+  const { accessToken, refreshToken } = await getOdAuthTokens(keyv)
 
   // Return in storage access token if it is still valid
   if (typeof accessToken === 'string') {
@@ -54,10 +62,11 @@ async function getAccessToken(): Promise<any> {
 
   if ('access_token' in resp.data && 'refresh_token' in resp.data) {
     const { expires_in, access_token, refresh_token } = resp.data
-    await tokenStore.storeOdAuthTokens({
+    await storeOdAuthTokens({
       accessToken: access_token,
       accessTokenExpiry: parseInt(expires_in),
       refreshToken: refresh_token,
+      keyv,
     })
     console.log('Fetch new access token with stored refresh token.')
     return access_token
@@ -78,10 +87,11 @@ export default async function handler(req: NextApiRequest, res: NextApiResponse)
       return
     }
 
-    await tokenStore.storeOdAuthTokens({
+    await storeOdAuthTokens({
       accessToken,
       accessTokenExpiry,
       refreshToken,
+      keyv,
     })
     res.status(200).send('OK')
     return