fix(provider): update tiktok token

[DewinU]

☕️ Reasoning

• Added the default issuer since tiktok does not have one
• Added token url correction (these fixes issues on v4)
• Added username to the default username request as fallback, since tiktok does not support email.

🧢 Checklist

• Documentation
• Tests
• Ready to be merged

🎫 Affected issues

• Resolving the error InvalidEndpoints: Provider "tiktok" is missing both `issuer` and `token` endpoint config #11267
• TIKTOK:: Provider "tiktok" is missing both issuer and token endpoint config. At least one of them is required #9800

📌 Resources

• Security guidelines
• Contributing guidelines
• Code of conduct
• Contributing to Open Source

Video Demostration

https://youtu.be/M-PCU-e8IGI?si=uunGbOxhNXIRlnXT

To make this work i also need to take control of the request with the conform function, since the token request manipulation was disable (see #11057)

let tkCode: string | undefined;
let tkCallback: string | undefined;
export const { handlers, auth, signIn, signOut } = NextAuth(req =>{
  if (req?.method === 'GET' && req?.headers.get('referer')?.includes('tiktok')) {
    const url = new URL(req?.url);
    tkCode = url.searchParams.get('code') as string;
    tkCallback = url.pathname
  }
  return {
    theme: { logo: "https://authjs.dev/img/logo-sm.png" },
    adapter: UnstorageAdapter(storage),
    providers: [
      GitHub,
      TikTok({
        clientId: process.env.AUTH_TIKTOK_KEY,
        clientSecret: process.env.AUTH_TIKTOK_SECRET,
        token: {
          async conform(response: Response) {
            const res = await fetch(response.url, {
              method: 'POST',
              headers: {
                'Cache-Control': 'no-cache',
                'Content-Type': 'application/x-www-form-urlencoded',
              },
              body: new URLSearchParams({
                client_key: process.env.AUTH_TIKTOK_KEY!,
                client_secret: process.env.AUTH_TIKTOK_SECRET!,
                code: tkCode!,
                grant_type: 'authorization_code',
                redirect_uri: process.env.AUTH_URL! + tkCallback ,
              }),
            });
            return res;
          },
        }
      })
    ],
    basePath: "/auth",
    callbacks: {
      authorized({ request, auth }) {
        const { pathname } = request.nextUrl
        if (pathname === "/middleware-example") return !!auth
        return true
      },
      jwt({ token, trigger, session, account }) {
        if (trigger === "update") token.name = session.user.name
        if (account?.provider === "keycloak") {
          return { ...token, accessToken: account.access_token }
        }
        return token
      },
      async session({ session, token }) {
        if (token?.accessToken) {
          session.accessToken = token.accessToken
        }
        return session
      },
    },
    experimental: {
      enableWebAuthn: true,
    },
    debug: process.env.NODE_ENV !== "production" ? true : false,
  } satisfies NextAuthConfig
})

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (main@5c49f95). Learn more about missing BASE report.

Files	Patch %	Lines
packages/core/src/providers/tiktok.ts	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11308   +/-   ##
=======================================
  Coverage        ?   39.91%           
=======================================
  Files           ?      179           
  Lines           ?    28671           
  Branches        ?     1249           
=======================================
  Hits            ?    11445           
  Misses          ?    17226           
  Partials        ?        0           

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