#Auth and Social Login

Authentication is a critical component of modern web applications, yet implementing it correctly can be challenging and error-prone. AIScript simplifies this process with built-in authentication directives that handle complex security flows while maintaining type safety throughout the authentication process.

#Authentication Options

AIScript provides several authentication mechanisms out of the box:

• JWT Authentication: Secure token-based authentication
• Basic Authentication: Simple username/password authentication
• SSO (Single Sign-On): Integration with social login providers like Google, GitHub, and more

#JWT

JSON Web Tokens (JWT) provide a stateless authentication mechanism that's perfect for APIs and single-page applications. AIScript makes JWT implementation straightforward with the @auth directive.

post /signin {
    body {
        username: str,
        password: str,
    }

    // Verify username and password correctly
    use std.auth.jwt;
    // Create payload with claims
    let payload = {
        sub: body.username,
    };

    // Create access token that expires in 1 hour (3600 seconds)
    let token = jwt.create_access_token(payload, 3600, "your-secret");
    return { token };
}

@auth
get /ask {
    query {
        @string(min_len=5, max_len=50)
        question: str
    }

    ai fn ask_llm(question: str) -> str {
        return prompt question;
    }
    let answer = ask_llm(query.question);
    return { answer };
}

When a route is decorated with @auth, AIScript automatically:

1. Verifies the JWT token from the Authorization header
2. Rejects requests with invalid or expired tokens
3. Makes the decoded token payload available within the route handler

Configure JWT settings in your project.toml:

[auth.jwt]
secret = "your-secret"
expiration = 3600  # Token expiration time in seconds

For enhanced security, use environment variables for sensitive values like the JWT secret.

#Basic Auth

For simpler use cases or admin interfaces, AIScript provides basic authentication with the @basic_auth directive:

@basic_auth
post /guess {
    body {
        @number(min=1, max=100)
        magic: int = 1
    }
    
    let result = "Try again!";
    if body.magic == 42 {
        result = "You guessed it!";
    }
    return { result };
}

The @basic_auth directive validates username and password credentials according to your configuration.

Configure basic authentication in your project.toml:

[auth.basic]
username = "admin"
password = "123456"  # Use environment variables for production

#Social Login with SSO

AIScript makes implementing social login seamless with the @sso directive. This handles the complex OAuth flows required by providers like Google, GitHub, or Microsoft.

#Setting Up Google Authentication

1. Configure the provider in your project.toml:

[sso.google]
client_id = "123"  # Your Google OAuth client ID
client_secret = "abc"  # Your Google OAuth client secret
redirect_url = "http://localhost:8080/auth/google/callback"
scopes = ["email", "profile"]

2. Create an authorization endpoint:

@sso(provider="google")
get /auth/google {
    let url = sso.authority_url();
    print(url);
    return temporary_redirect(target=url);
}

3. Implement the callback endpoint:

@sso(provider="google")
get /auth/google/callback {
    query {
        code: str,
        state: str,
    }

    print("code", query.code);
    print("state", query.state);
    let user_info = sso.verify(code=query.code);
    print(user_info);
    return { user_info };
}

When a user visits /auth/google, they'll be redirected to Google's authentication page. After successful authentication, Google redirects back to your /auth/google/callback endpoint with an authorization code. The sso.verify() function exchanges this code for an access token and retrieves the user's profile information.

#Supporting Multiple Providers

AIScript supports multiple SSO providers simultaneously. Simply add additional configurations in your project.toml:

[sso.github]
client_id = "456"
client_secret = "def"
redirect_url = "http://localhost:8080/auth/github/callback"
scopes = ["user:email"]

[sso.microsoft]
client_id = "789"
client_secret = "ghi"
redirect_url = "http://localhost:8080/auth/microsoft/callback"
scopes = ["User.Read"]

Then create corresponding route handlers for each provider:

@sso(provider="github")
get /auth/github {
    return temporary_redirect(target=sso.authority_url());
}

@sso(provider="github")
get /auth/github/callback {
    query { code: str, state: str }
    let user_info = sso.verify(code=query.code);
    return { user_info };
}

#Conclusion

AIScript's authentication directives simplify the implementation of secure authentication flows without sacrificing flexibility. Whether you need simple password-based authentication or complex multi-provider SSO, AIScript provides the tools to implement authentication with minimal boilerplate while maintaining type safety throughout the process.

By abstracting away the complex security details, AIScript lets you focus on building your application logic while ensuring your authentication implementation follows security best practices.