I have the required fields for user login how to bypass the nextauth login page and perform the authorize method - authentication

Question

I create a custom user registration because nextauth does not support registration. Everything works correctly but I do not know how after a successful registration of the user immediately log him in the credentials that he gave during registration.
As far as I can see, the signIn method from nextauth does not allow any credentials to be passed on to it. Redirects only to the login subpage.
I also did not find any endpoint that provides nextauth to which I can pass parameters so as to log in the user.
In fact, it is enough to call the authorize method that is in nextauth, unfortunately, there is no possibility to export it or there is no way to call it from the call to api level and it is a pity because with it I could log in the user.
User flow
User registers if the registration is successful, he is immediately logged in credentials that he provided during registration
My registration
async function handleRegister(
username: string,
email: string,
password: string
) {
const registerUser = await fetch(
`${process.env.API_URL}`,
{
method: "POST",
headers: {
Accept: "application/json",
"Content-Type": "application/json",
},
body: JSON.stringify({
username,
email,
password,
}),
}
);
const registerResponse = await registerUser.json();
if (registerResponse.user) {
// TODO: Login with NextAuth
}
}
[...nextauth].ts
export default NextAuth({
providers: [
CredentialsProvider({
name: "Credentials",
credentials: {
identifier: {
label: "Email or Username",
type: "text",
placeholder: "jsmith",
},
password: { label: "Password", type: "password" },
},
async authorize(credentials, req) {
const res = await fetch(
`${process.env.NEXT_PUBLIC_API_URL}/api/auth/local`,
{
method: "POST",
body: JSON.stringify(credentials),
headers: { "Content-Type": "application/json" },
}
);
const user = await res.json();
if (res.ok && user) {
return user;
}
return null;
},
}),
],
session: {
strategy: "jwt",
},
jwt: {
maxAge: 60,
encode: async ({ secret, token }) => {
const encodedToken = jsonwebtoken.sign(token!, secret, {
algorithm: "HS256",
});
return encodedToken;
},
decode: async ({ secret, token }) => {
const decodedToken = jsonwebtoken.verify(token!, secret, {
algorithms: ["HS256"],
});
return decodedToken as JWT;
},
},
callbacks: {
jwt: async (token, user, account) => {
const isSignIn = user ? true : false;
if (isSignIn) {
token.jwt = user.jwt;
token.id = user.user.id;
token.name = user.user.username;
token.role = user.user.user_role;
token.email = user.user.email;
}
return Promise.resolve(token);
},
session: async ({ session, token }) => {
if (session.user) {
session.user.id = token.sub!;
}
return session;
},
},
secret: process.env.JWT_SECRET,
});

Answer 1

You need to login with credentials e.g
const response: SignInResponse | undefined = await signIn(
"credentials",
{
redirect: false,
email: "example#user.com",
password: "12345678",
}
);