commerce/framework/saleor/auth/use-login.tsx

import { useCallback } from 'react'

import type { MutationHook } from '@commerce/utils/types'
import { CommerceError } from '@commerce/utils/errors'
import useCustomer from '../customer/use-customer'
import * as mutation from '../utils/mutations'
import {
  Mutation,
  MutationTokenCreateArgs,
} from '../schema'
import useLogin, { UseLogin } from '@commerce/auth/use-login'
import { setCSRFToken, setToken, throwUserErrors, checkoutAttach, getCheckoutId } from '../utils'

export default useLogin as UseLogin<typeof handler>

export const handler: MutationHook<null, {}, MutationTokenCreateArgs> = {
  fetchOptions: {
    query: mutation.SessionCreate,
  },
  async fetcher({ input: { email, password }, options, fetch }) {
    if (!(email && password)) {
      throw new CommerceError({
        message:
          'A first name, last name, email and password are required to login',
      })
    }

    const { tokenCreate } = await fetch<
      Mutation,
      MutationTokenCreateArgs
    >({
      ...options,
      variables: { email, password },
    })

    throwUserErrors(tokenCreate?.errors)

    const { token, csrfToken }  = tokenCreate!;

    if (token && csrfToken) {
      setToken(token)
      setCSRFToken(csrfToken)
      
      const { checkoutId } = getCheckoutId();
      checkoutAttach(fetch, { 
        variables: { checkoutId },
        headers: {
          Authorization: `JWT ${token}`
        }
      })
    }

    return null
  },
  useHook: ({ fetch }) => () => {
    const { revalidate } = useCustomer()

    return useCallback(
      async function login(input) {
        const data = await fetch({ input })
        await revalidate()
        return data
      },
      [fetch, revalidate]
    )
  },
}