Google OAuth: Redirect URI mismatch

[juni0r]

Hi,

I found your module by chance, trying to integrate Lucia into Nuxt. It works great so far in my own project, except for Google OAuth on callback:

 ERROR  [nuxt] [request error] [unhandled] [500] redirect_uri_mismatch
  at OAuth2Client.sendTokenRequest (./node_modules/.pnpm/[email protected]/node_modules/oslo/dist/oauth2/index.js:99:19)  
  at process.processTicksAndRejections (node:internal/process/task_queues:95:5)  
  at async OAuth2Client.validateAuthorizationCode (./node_modules/.pnpm/[email protected]/node_modules/oslo/dist/oauth2/index.js:59:16)  
  at async Google.validateAuthorizationCode (./node_modules/.pnpm/[email protected]/node_modules/arctic/dist/providers/google.js:23:24)  
  at Object.handler (./node_modules/.pnpm/@[email protected][email protected][email protected]/node_modules/@fixers/nuxt-lucia-auth/dist/runtime/server/providers/google.js:55:22)  
  at async ./node_modules/.pnpm/[email protected]/node_modules/h3/dist/index.mjs:1975:19  
  at async Object.callAsync (./node_modules/.pnpm/[email protected]/node_modules/unctx/dist/index.mjs:72:16)  
  at async Server.toNodeHandle (./node_modules/.pnpm/[email protected]/node_modules/h3/dist/index.mjs:2266:7)

Upon investigation, I found that the provider uses the callback URL from the current request:

nuxt-lucia-auth/src/runtime/server/providers/google.ts

Lines 95 to 97 in 715989c

	// Redirect on this exact endpoint
	const redirectUrl = getRequestURL(event).href

However, this includes the query parameters added by Google which need to be removed. Changing this to

const redirectUrl = getRequestURL(event).href.split['?'][0]

will remove the query part of the callback URL and I can authentication works.