useLogin

useLogin calls login method from authProvider under the hood.
It authenticates the app if login method from authProvider resolves and if it rejects shows an error notification. After successful authentication it redirects the app to root.

It returns the result of react-query's useMutation.

Data that is resolved from login will be returned as the data in the query result.

Usage

Normally refine provides a default login page. If you prefer to use this default login page, there is no need to handle login flow manually.
If we want to build a custom login page instead of default one that comes with refine, useLogin can be used like this:

pages/customLoginPage

import { useLogin } from "@pankod/refine-core";
import { Form } from "@pankod/refine-antd";

type LoginVariables = {
    username: string;
    password: string;
};

export const LoginPage = () => {
    const { mutate: login } = useLogin<LoginVariables>();

    const onSubmit = (values: LoginVariables) => {
        login(values);
    };

    return <Form onFinish={onSubmit}>// rest of the login form</Form>;
};

tip

mutate acquired from useLogin can accept any kind of object for values since login method from authProvider doesn't have a restriction on its parameters.
A type parameter for the values can be provided to useLogin.

const { mutate: login } = useLogin<{ username: string; password: string }>();

Redirection after login

We have 3 options for redirecting the app after login successfully .

• If promise returned from login is resolved with nothing, app will be redirected to the / route by default.

• A custom url can be resolved from the promise returned from the login method of the authProvider.

const authProvider: AuthProvider = {
    ...
    login: () => {
        ...
        return Promise.resolve("/custom-url");
    }
}

A custom url can be given to mutate function from the useLogin hook if you want to redirect yourself to a certain url.

import { useLogin } from "@pankod/refine-core";

const { mutate: login } = useLogin();

login({ redirectPath: "/custom-url" });

Then, you can handle this url in your login method of the authProvider.

const authProvider: AuthProvider = {
    ...
    login: ({ redirectPath }) => {
        ...
        return Promise.resolve(redirectPath);
    }
}

• If promise returned from the login method of the authProvider gets resolved with false no redirection will occur.

const authProvider: AuthProvider = {
    ...
    login: () => {
        ...
        return Promise.resolve(false);
    }
}

caution

This hook can only be used if authProvider is provided.