ShipRepo/app/api/auth/github/callback/route.ts at 655e65eaf15c4b8c4760cf84ce01e8017ba466e2 · labring/ShipRepo · GitHub

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import { type NextRequest } from 'next/server'
import { cookies } from 'next/headers'
import { db } from '@/lib/db/client'
import { users, accounts, tasks, connectors, keys } from '@/lib/db/schema'
import { eq, and } from 'drizzle-orm'
import { getAppBaseUrl, getGitHubClientId } from '@/lib/auth/oauth'
import { createGitHubSession, saveSession } from '@/lib/session/create-github'
import { encrypt } from '@/lib/crypto'
import { generateId } from '@/lib/utils/id'
import {
  GITHUB_AUTH_ERROR_MESSAGE_TYPE,
  GITHUB_AUTH_POPUP_COOKIE,
  GITHUB_AUTH_POPUP_VALUE,
  GITHUB_AUTH_SUCCESS_MESSAGE_TYPE,
} from '@/lib/auth/github-popup-contract'

const GITHUB_AUTH_COOKIES = [
  GITHUB_AUTH_POPUP_COOKIE,
  'github_auth_state',
  'github_auth_redirect_to',
  'github_auth_mode',
  'github_auth_user_id',
  'github_oauth_state',
  'github_oauth_redirect_to',
  'github_oauth_user_id',
] as const

type CookieStore = Awaited<ReturnType<typeof cookies>>
type PopupStatus = 'success' | 'error'

function cleanupGitHubAuthCookies(cookieStore: CookieStore): void {
  for (const cookieName of GITHUB_AUTH_COOKIES) {
    cookieStore.delete(cookieName)
  }
}

function createGitHubPopupResponse(req: NextRequest, status: PopupStatus, responseInit?: ResponseInit): Response {
  const origin = new URL(getAppBaseUrl(req)).origin
  const messageType = status === 'success' ? GITHUB_AUTH_SUCCESS_MESSAGE_TYPE : GITHUB_AUTH_ERROR_MESSAGE_TYPE
  const html = `<!doctype html>
<html>
  <head>
    <meta charset="utf-8" />
    <title>GitHub Authentication</title>
  </head>
  <body>
    <script>
      window.opener?.postMessage({ type: ${JSON.stringify(messageType)}, status: ${JSON.stringify(status)} }, ${JSON.stringify(origin)});
      window.close();
    </script>
  </body>
</html>`

  return new Response(html, {
    status: responseInit?.status ?? 200,
    headers: {
      'Content-Type': 'text/html; charset=utf-8',
      'Cache-Control': 'no-store',
      ...responseInit?.headers,
    },
  })
}

export async function GET(req: NextRequest): Promise<Response> {
  const code = req.nextUrl.searchParams.get('code')
  const state = req.nextUrl.searchParams.get('state')
  const cookieStore = await cookies()

  const popupCookie = cookieStore.get(GITHUB_AUTH_POPUP_COOKIE)?.value ?? null
  if (popupCookie !== GITHUB_AUTH_POPUP_VALUE) {
    cleanupGitHubAuthCookies(cookieStore)
    return createGitHubPopupResponse(req, 'error', { status: 400 })
  }

  const authMode = cookieStore.get('github_auth_mode')?.value ?? null
  const isSignInFlow = authMode === 'signin'
  const isConnectFlow = authMode === 'connect'
  const storedState = cookieStore.get('github_auth_state')?.value ?? null
  const storedRedirectTo = cookieStore.get('github_auth_redirect_to')?.value ?? null
  const storedUserId = cookieStore.get('github_auth_user_id')?.value ?? null

  if (code === null || state === null || storedState !== state || storedRedirectTo === null) {
    cleanupGitHubAuthCookies(cookieStore)
    return createGitHubPopupResponse(req, 'error', { status: 400 })
  }

  if ((!isSignInFlow && !isConnectFlow) || (isConnectFlow && storedUserId === null)) {
    cleanupGitHubAuthCookies(cookieStore)
    return createGitHubPopupResponse(req, 'error', { status: 400 })
  }

  const clientId = getGitHubClientId()
  const clientSecret = process.env.GITHUB_CLIENT_SECRET

  if (!clientId || !clientSecret) {
    cleanupGitHubAuthCookies(cookieStore)
    return createGitHubPopupResponse(req, 'error', { status: 500 })
  }

  try {
    console.info('GitHub OAuth callback started')

    const tokenResponse = await fetch('https://github.com/login/oauth/access_token', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        Accept: 'application/json',
      },
      body: JSON.stringify({
        client_id: clientId,
        client_secret: clientSecret,
        code: code,
      }),
    })

    if (!tokenResponse.ok) {
      console.error('GitHub OAuth token exchange failed')
      cleanupGitHubAuthCookies(cookieStore)
      return createGitHubPopupResponse(req, 'error', { status: 400 })
    }

    const tokenData = (await tokenResponse.json()) as {
      access_token?: string
      scope?: string
      token_type?: string
      error?: string
      error_description?: string
    }

    if (!tokenData.access_token) {
      console.error('GitHub OAuth access token missing')
      cleanupGitHubAuthCookies(cookieStore)
      return createGitHubPopupResponse(req, 'error', { status: 400 })
    }

    const userResponse = await fetch('https://api.github.com/user', {
      headers: {
        Authorization: `Bearer ${tokenData.access_token}`,
        Accept: 'application/vnd.github.v3+json',
      },
    })

    if (!userResponse.ok) {
      console.error('GitHub OAuth user fetch failed')
      cleanupGitHubAuthCookies(cookieStore)
      return createGitHubPopupResponse(req, 'error', { status: 400 })
    }

    const githubUser = (await userResponse.json()) as {
      login: string
      id: number
    }

    if (isSignInFlow) {
      const session = await createGitHubSession(tokenData.access_token, tokenData.scope)

      if (!session) {
        console.error('GitHub OAuth session creation failed')
        cleanupGitHubAuthCookies(cookieStore)
        return createGitHubPopupResponse(req, 'error', { status: 500 })
      }

      const response = createGitHubPopupResponse(req, 'success')
      await saveSession(response, session)
      cleanupGitHubAuthCookies(cookieStore)

      return response
    }

    const encryptedToken = encrypt(tokenData.access_token)

    const existingAccount = await db
      .select()
      .from(accounts)
      .where(and(eq(accounts.provider, 'github'), eq(accounts.externalUserId, `${githubUser.id}`)))
      .limit(1)

    if (existingAccount.length > 0) {
      const connectedUserId = existingAccount[0].userId

      if (connectedUserId !== storedUserId) {
        console.info('GitHub OAuth account merge started')

        await db.update(tasks).set({ userId: storedUserId! }).where(eq(tasks.userId, connectedUserId))
        await db.update(connectors).set({ userId: storedUserId! }).where(eq(connectors.userId, connectedUserId))
        await db.update(accounts).set({ userId: storedUserId! }).where(eq(accounts.userId, connectedUserId))
        await db.update(keys).set({ userId: storedUserId! }).where(eq(keys.userId, connectedUserId))
        await db.delete(users).where(eq(users.id, connectedUserId))

        console.info('GitHub OAuth account merge completed')

        await db
          .update(accounts)
          .set({
            userId: storedUserId!,
            accessToken: encryptedToken,
            scope: tokenData.scope,
            username: githubUser.login,
            updatedAt: new Date(),
          })
          .where(eq(accounts.id, existingAccount[0].id))
      } else {
        await db
          .update(accounts)
          .set({
            accessToken: encryptedToken,
            scope: tokenData.scope,
            username: githubUser.login,
            updatedAt: new Date(),
          })
          .where(eq(accounts.id, existingAccount[0].id))
      }
    } else {
      await db.insert(accounts).values({
        id: generateId(21),
        userId: storedUserId!,
        provider: 'github',
        externalUserId: `${githubUser.id}`,
        accessToken: encryptedToken,
        scope: tokenData.scope,
        username: githubUser.login,
      })
    }

    cleanupGitHubAuthCookies(cookieStore)
    return createGitHubPopupResponse(req, 'success')
  } catch {
    console.error('GitHub OAuth callback failed')
    cleanupGitHubAuthCookies(cookieStore)
    return createGitHubPopupResponse(req, 'error', { status: 500 })
  }
}