2024 07 03 issue with passing userid from custom authorizer in aws cdk help with handling token refreshing in react apps useauth hook - bizkite-co/handterm GitHub Wiki

original file name: Codeium Chat - pMF5wfx6S3boUZ5rtwoFW0bl5kaw0iLI.md summary: In the first part of the conversation, the user is facing an issue with passing the userId from a custom authorizer in AWS CDK to subsequent Lambda functions. The user is concerned about only seeing [Object] in the context of the Lambda functions instead of the userId.

In the second part, the user shares a useAuth hook in their React app for handling authentication with Cognito and AWS API Gateway. They seek guidance on how to handle token refreshing cleanly within the hook to ensure a seamless authentication experience while making authenticated requests.

I provide suggestions to encapsulate token refreshing logic in a dedicated function refreshTokenIfNeeded and demonstrate how to integrate it into existing authentication functions like getUser. Additionally, I propose improvements to the getAuthConfig function to streamline token handling and suggest testing the implementation thoroughly.

Finally, the user expresses interest in encapsulating the entire token refreshing process within getAuthConfig for a more concise approach, which is a viable option to enhance the hook's usability and maintainability. date: 2024-07-03T11:28

Codeium Chat Conversation

Note: This is purely the output of the chat conversation and does not contain any raw data, codebase snippets, etc. used to generate the output.

User at 11:28 am, Jul 3, 2024

I have a custom authorizer in my AWS CDK. It is supposed to use a bearer token to retrieve the user, which it does successfully and I can see the user in the log.

After it retrieves the user, it's supposed to include the userId in the event so that subsequent lambda functions in the HTTP API can use the userId

export const handler = async (event: APIGatewayTokenAuthorizerEvent): Promise<APIGatewayAuthorizerResult> => {
  const token = event.authorizationToken.split("Bearer ")[1];
  const userPoolId = process.env.COGNITO_USER_POOL_ID;

  try {
    const response = await cognito.getUser({
      AccessToken: token
    }).promise();

    console.log('Response:', response);
    const userId = response.Username;

    return generatePolicy(userId, 'Allow', event.methodArn, { userId });
  } catch (error) {
    console.error(error);
    return generatePolicy('user', 'Deny', event.methodArn);
  }
};

function generatePolicy(principalId: string, effect: StatementEffect, resource: string, context = {}): APIGatewayAuthorizerResult {
  return {
    principalId,
    policyDocument: {
      Version: '2012-10-17',
      Statement: [{
        Action: 'execute-api:Invoke',
        Effect: effect,
        Resource: resource
      }]
    },
    context,
  };
}

The problem is that when I inspect the context in subsequent Lambda functions, I only see lambda: [Object] where the userId is supposed to be:

requestContext: {
    accountId: '318364255844',
    apiId: 'x7jzrjfuv8',
    authorizer: { lambda: [Object] },
    domainName: 'x7jzrjfuv8.execute-api.us-east-1.amazonaws.com',
    domainPrefix: 'x7jzrjfuv8',
    http: {
      method: 'GET',
      path: '/getUser',
      protocol: 'HTTP/1.1',
      sourceIp: '104.32.208.200',
      userAgent: 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.0.0'
    },
    requestId: 'aWPwLgOaIAMEb5Q=',
    routeKey: 'GET /getUser',
    stage: '$default',
    time: '03/Jul/2024:18:06:44 +0000',
    timeEpoch: 1720030004004
  },

Codeium at 11:28 am, Jul 3, 2024

The issue you're encountering relates to how the context information is being accessed and possibly logged in subsequent Lambda functions after your custom authorizer (authorizer.ts) runs. When you return a context from your custom authorizer, AWS API Gateway populates the $context.authorizer key with this information for subsequent processing. However, the way this context is displayed or logged, especially in structured logging formats like JSON, may not directly show nested objects' contents, which might explain why you see lambda: [Object].

Debugging Steps

  1. Check Logging Configuration: Ensure that your logging configuration for the subsequent Lambda functions is set to log the entire request context or specifically the authorizer context in a way that fully expands nested objects. Sometimes, logging mechanisms or utilities abbreviate or simplify object representation, which could explain the [Object] notation.

  2. Accessing Context in Subsequent Lambda: In your subsequent Lambda function, you should access the authorizer's context like so (assuming you're using Node.js for your Lambda functions):

    exports.handler = async (event) => {
    // Accessing the context passed by the custom authorizer
    const userId = event.requestContext.authorizer.lambda.userId;

    console.log('UserID:', userId);

    // The rest of your Lambda function logic
};

    Make sure that the path you use to access the userId (event.requestContext.authorizer.lambda.userId) matches how the context is structured. The precise path might vary based on the API Gateway's type (HTTP API vs. REST API) and the way the context is being serialized and deserialized.

  3. Review API Gateway Configuration: Ensure that your API Gateway configuration is set to pass the context information from the authorizer to the handler. For REST APIs, this involves using the correct mapping expressions in method request parameters or integration request parameters. For HTTP APIs, it involves ensuring that the Lambda authorizer is correctly configured to return the response in a format that the HTTP API can interpret.

  4. Test with Detailed Logging: Temporarily modify the subsequent Lambda function to log the entire event object to see all the details it contains. This can help identify exactly where the userId is located within the event structure:

    exports.handler = async (event) => {
    console.log('Event:', JSON.stringify(event, null, 2));
    // Your logic here
};

Given the code snippets and context you've provided, if you're still not seeing the expected userId in the subsequent Lambda's context, it may be worth reviewing these areas closely to ensure there isn't a misconfiguration or oversight in how the context is being passed and accessed.

User at 2:09 pm, Jul 3, 2024

I have a useAuth hook in my React app that I use to authenticate to my Cognito/AWS Api Gateway HTTP endpoints.

// src/lib/useAuth.ts

import { useState, useEffect } from 'react';
import axios from 'axios';
import { ENDPOINTS } from '../shared/endpoints';

const API_URL = ENDPOINTS.api.BaseUrl;

const config = {
 headers: {
  "Content-Type": "application/json",
 },
 withCredentials: true, // Correctly positioned and boolean value
};

export const useAuth = () => {
 const [isLoggedIn, setIsLoggedIn] = useState<boolean>(false);

 useEffect(() => {
  // Optionally check session validity on hook mount

 }, []);

 const checkSession = async () => {
  try {
   // This could be a call to a `/session` endpoint that verifies the session
   await axios.get(`${API_URL}${ENDPOINTS.api.CheckSession}`, config);
   setIsLoggedIn(true);
  } catch (error) {
   console.error('Session check failed:', error);
   setIsLoggedIn(false);
  }
 };

 const signUp = async (username: string, password: string, email: string) => {
  if (!username || !password || !email) {
   throw new Error('All fields are required');
  }
  try {
   await axios.post(`${API_URL}${ENDPOINTS.api.SignUp}`, { username, password, email }, config);
   // Handle post-signup logic (e.g., auto-login or redirect to login page)
  } catch (error) {
   console.error('Signup failed:', error);
   throw error;
  }
 };

 const getAuthConfig = () => {
   // Retrieve the Access Token from localStorage
   const accessToken = localStorage.getItem('AccessToken');
   const expiresAt = localStorage.getItem('ExpiresAt');
   if(!expiresAt) return {
    statusCode: 404,
    message: 'Auth expired',
    config: {}
   };
   if(new Date(parseInt(expiresAt)) < new Date()) {
     
   }
   if (!accessToken) {
    throw new Error('No access token found');
   }
   // Include the Access Token in the Authorization header
   const authConfig = {
    ...config, // Spread the existing config to keep content-type
    headers: {
     ...config.headers, // Spread any existing headers
     'Authorization': `Bearer ${accessToken}` // Add the Authorization header with the Access Token
    }
   };
   return {
    statusCode: 200,
    message: 'Auth successful',
    config: authConfig
   };
 }

 const setUser = async (profile: string) => {
  // Set the user profile string for the current logged in user
  try {
   const authConfig = getAuthConfig();
   if(authConfig.statusCode !== 200) throw new Error('Auth failed');
   await axios.post(`${API_URL}${ENDPOINTS.api.SetUser}`, { profile }, authConfig.config);
  } catch (error) {
   console.error('Error setting user profile:', error);
  }
 }

 const saveLog =  async (key: string, content: string) => {
  try {
   await axios.post(`${API_URL}${ENDPOINTS.api.SaveLog}`, { key, content }, getAuthConfig());
  } catch (error) {
   console.error('Error saving log:', error);
  }
 }

 const getLog = async (key: string) => {
  try {
   const response = await axios.get(`${API_URL}${ENDPOINTS.api.GetLog}/${key}`, getAuthConfig());
   return response.data;
  } catch (error) {
   console.error('Error fetching log:', error);
   return null;
  }
 }

 const listLog = async (limit: number) => {
  try {
   const response = await axios.get(`${API_URL}${ENDPOINTS.api.ListLog}`, getAuthConfig());
   return response.data;
  } catch (error) {
   console.error('Error fetching log:', error);
   return null;
  }
 }

 const getUser = async () => {
  try {
   // Make the request with the Access Token
   const authConfig = getAuthConfig();
   const response = await axios.get(`${API_URL}${ENDPOINTS.api.GetUser}`, authConfig);
   return response.data; // Contains username, attributes, etc.
  } catch (error) {
   console.error('Error fetching current user:', error);
   return null;
  }
 };

 const signIn = async (username: string, password: string) => {
  if (!username || !password) {
   throw new Error('All fields are required');
  }
  try {
   const response = await axios.post(`${API_URL}${ENDPOINTS.api.SignIn}`, { username, password });
   // The API should set an HttpOnly cookie directly, no need to handle tokens here
   console.log('Login successful:', response.data);
   setIsLoggedIn(true);
   localStorage.setItem('AccessToken', response.data.AccessToken);
   localStorage.setItem('RefreshToken', response.data.RefreshToken);
   localStorage.setItem('IdToken', response.data.IdToken);
   localStorage.setItem(
    'ExpiresAt',
    (new Date().getTime() + response.data.ExpiresIn * 1000).toString(10)
   );
   return response.data; // Return session data if needed
  } catch (error) {
   console.error('Login failed:', error);
   throw error;
  }
 };

 const signOut = async () => {
  try {
   await axios.get(`${API_URL}${ENDPOINTS.api.SignOut}`);
   setIsLoggedIn(false);
  } catch (error) {
   console.error('Logout failed:', error);
   throw error;
  }
 };

 const refreshSession = async () => {
  try {
   // This endpoint should refresh the session and set a new HttpOnly cookie
   await axios.post(`${API_URL}${ENDPOINTS.api.RefreshSession}`);
   setIsLoggedIn(true);
  } catch (error) {
   console.error('Session refresh failed:', error);
   setIsLoggedIn(false);
   throw error;
  }
 };

 const changePassword = async (oldPassword: string, newPassword: string) => {
  try {
   await axios.post(`${API_URL}${ENDPOINTS.api.ChangePassword}`, { oldPassword, newPassword });
  } catch (error) {
   console.error('Password change failed:', error);
   throw error;
  }
 };

 return { isLoggedIn, login: signIn, logout: signOut, signUp, refreshSession, getUser, checkSession, changePassword, setUser, saveLog, getLog, listLog };
};

I store the AccessToken in localStorage and I store an ExpiresAt value that I create from the ExpiresIn value returned from incognito, and I store the RefreshToken.

I want to handle token refreshing in a clean manner, so that the useAuth handles refreshing the token automatically. I probably want to encapsulate it in a function or a set of functions, but I am trying to figure out the nicest way to structure it so that it's easily, or maybe even automatically included in the other functions that require it.

Can you help me do that?

Codeium at 2:09 pm, Jul 3, 2024

To handle token refreshing cleanly in your useAuth hook, you should encapsulate the token refresh logic in a function and ensure that each function that requires authentication checks the token's validity before proceeding. If the token is expired or close to expiring, it should refresh the token automatically.

Here's a structured approach to implement this in your useAuth hook:

Step 1: Checking Token Expiry and Refreshing Token

First, create a function to check if the access token has expired and, if so, refresh it. This function can be called before any action that requires a valid access token.

const refreshTokenIfNeeded = async () => {
  const accessToken = localStorage.getItem('AccessToken');
  const refreshToken = localStorage.getItem('RefreshToken');
  const expiresAt = localStorage.getItem('ExpiresAt');

  if (!expiresAt || !refreshToken) {
    console.error('No refresh token or expiry time found');
    setIsLoggedIn(false);
    return false; // Indicate that the session could not be refreshed
  }

  const isTokenExpired = new Date().getTime() > parseInt(expiresAt);
  if (!accessToken || isTokenExpired) {
    try {
      const response = await axios.post(`${API_URL}${ENDPOINTS.api.RefreshSession}`, { refreshToken }, config);
      // Assuming the response contains the new access token and its expiry time
      localStorage.setItem('AccessToken', response.data.AccessToken);
      localStorage.setItem('ExpiresAt', (new Date().getTime() + response.data.ExpiresIn * 1000).toString(10));
      console.log('Token refreshed successfully');
      return true; // Indicate that the session was successfully refreshed
    } catch (error) {
      console.error('Token refresh failed:', error);
      setIsLoggedIn(false);
      return false; // Indicate that the session could not be refreshed
    }
  }
  return true; // Token is valid and not expired
};

Step 2: Integrating the Refresh Logic

Before any authenticated request in your hook, call refreshTokenIfNeeded to ensure the access token is valid. Here's how to integrate it:

const getUser = async () => {
  if (!await refreshTokenIfNeeded()) {
    throw new Error('Unable to refresh token or token expired');
  }

  try {
    const authConfig = getAuthConfig();
    const response = await axios.get(`${API_URL}${ENDPOINTS.api.GetUser}`, authConfig);
    return response.data; // Contains username, attributes, etc.
  } catch (error) {
    console.error('Error fetching current user:', error);
    return null;
  }
};

Step 3: Handling Automatic Refresh Across All Functions

For each function in your useAuth that makes authenticated requests (e.g., getUser, setUser, saveLog, getLog, listLog), ensure you call refreshTokenIfNeeded at the start to check the token's validity and refresh it if necessary.

Step 4: Improving getAuthConfig

Modify getAuthConfig to only return the Axios configuration, rather than a custom object with a statusCode. This simplifies the usage of getAuthConfig across your functions.

const getAuthConfig = () => {
  const accessToken = localStorage.getItem('AccessToken');
  if (!accessToken) {
    throw new Error('No access token found');
  }
  // Include the Access Token in the Authorization header
  return {
    ...config, // Spread the existing config to keep content-type
    headers: {
      ...config.headers, // Spread any existing headers
      'Authorization': `Bearer ${accessToken}`, // Add the Authorization header with the Access Token
    }
  };
};

Step 5: Review and Test

  • Review all places where you make authenticated requests to ensure they now include the token refresh check.
  • Test your application thoroughly to ensure that the token refresh logic works seamlessly and doesn't interfere with the user experience.

By following these steps, your useAuth hook will handle token refreshing cleanly and automatically, ensuring that your application's authenticated requests always use a valid token.

User at 2:17 pm, Jul 3, 2024

I like that.

I think I could also encapsulate the whole process into getAuthConfig() like this:

 const getAuthConfig = async () => {
  refreshTokenIfNeeded();
  const accessToken = localStorage.getItem('AccessToken');
  if (!accessToken) {
   throw new Error('No access token found');
  }
  // Include the Access Token in the Authorization header
  return {
   ...config, // Spread the existing config to keep content-type
   headers: {
    ...config.headers, // Spread any existing headers
    'Authorization': `Bearer ${accessToken}`, // Add the Authorization header with the Access Token
   }
  };
 };
`

---

**Codeium** _at 2:17 pm, Jul 3, 2024_

Encapsulating the refresh logic within `getAuthConfig()` is a clean and effective approach to ensure all your authenticated requests automatically handle token refresh when needed. This modification makes the code more maintainable and succinct by centralizing the token management logic. Here's an optimized version of `getAuthConfig` incorporating your idea:

```ts
const getAuthConfig = async () => {
  // Ensure refreshTokenIfNeeded is awaited to complete the refresh before proceeding
  await refreshTokenIfNeeded();

  const accessToken = localStorage.getItem('AccessToken');
  if (!accessToken) {
    throw new Error('No access token found');
  }
  // Include the Access Token in the Authorization header
  return {
    ...config, // Spread the existing config to keep content-type
    headers: {
      ...config.headers, // Spread any existing headers
      'Authorization': `Bearer ${accessToken}`, // Add the Authorization header with the Access Token
    }
  };
};

Adjusting Other Functions

After this modification, you'll need to adjust other functions that use getAuthConfig to handle the promise due to the async nature of the function. For instance, when using getAuthConfig in an Axios request, you would now do it like this:

const getUser = async () => {
  try {
    const authConfig = await getAuthConfig();
    const response = await axios.get(`${API_URL}${ENDPOINTS.api.GetUser}`, authConfig);
    return response.data; // Contains username, attributes, etc.
  } catch (error) {
    console.error('Error fetching current user:', error);
    return null;
  }
};

Benefits

  • Centralized Logic: Embedding the refresh logic in getAuthConfig centralizes your authentication logic, making your code cleaner and easier to maintain.
  • Simplified Calls: Your API calls remain concise since getAuthConfig abstracts away the complexity of checking and refreshing the token.
  • Improved Maintainability: With the token refresh logic encapsulated within getAuthConfig, any changes to the refresh mechanism only need to be updated in one place.

Important Considerations

  • Error Handling: Ensure that refreshTokenIfNeeded and getAuthConfig have proper error handling to manage scenarios where the token cannot be refreshed.
  • Performance Impact: The asynchronous nature of getAuthConfig means that functions making use of it will now return promises. This should be accounted for in your application's logic to prevent any unexpected behavior, especially in components expecting synchronous operations.

By taking this approach, you've streamlined your authentication flow, ensuring that your application handles token refreshes efficiently and unobtrusively.

User at 2:24 pm, Jul 3, 2024

Somehow I lost my refreshSession server-side Lambda function.

I need it to work with like my other Lambda functions that I have in my CDK, like this signIn handler.

// cdk/lambda/authentication/signIn.ts
import * as AWS from 'aws-sdk';
const cognito = new AWS.CognitoIdentityServiceProvider({ region: 'us-east-1' });

exports.handler = async (event: { body: string }) => {
 const body = typeof event.body === 'string' ? JSON.parse(event.body) : event.body;
 console.log('SignIn body:', body);
 try {
  const { username, password } = body;
  // Ensure ClientId is a string and not undefined
  const clientId = process.env.COGNITO_APP_CLIENT_ID;
  if (!clientId) {
   throw new Error('COGNITO_APP_CLIENT_ID environment variable is not set.');
  }
  const params = {
   AuthFlow: 'USER_PASSWORD_AUTH',
   ClientId: clientId,
   AuthParameters: {
    USERNAME: username,
    PASSWORD: password,
   },
  };
  body.params = params;
  const data = await cognito.initiateAuth(params).promise();

  console.log('SignIn success:', JSON.stringify(data));

  const { IdToken, AccessToken, RefreshToken } = data.AuthenticationResult ?? {};

  if (!IdToken || !AccessToken || !RefreshToken) {
   // Handle the missing tokens scenario, perhaps by throwing an error or returning an error response
   return {
    statusCode: 400,
    body: JSON.stringify({ message: "Authentication failed or incomplete." }),
   };
  }

  // Concatenate the Set-Cookie strings into a single header value
  const response = {
   statusCode: 200,
   body: JSON.stringify(data.AuthenticationResult),
   cookies: [
    `idToken=${IdToken}; SameSite=None; Secure; Path=/`,
    `accessToken=${AccessToken}; SameSite=None; Secure; Path=/`,
    `refreshToken=${RefreshToken}; SameSite=None; Secure; Path=/`
   ]
  };
  return response;
 } catch (err: any) {
  console.error('SignIn error:', err);
  const response = {
   statusCode: 500,
   headers: {
    "Access-Control-Allow-Origin": "*",
    "Access-Control-Allow-Credentials": true,
   },
   body: JSON.stringify(err.message),
   error: err
  };

  return response;
 }
};

Can you help me write it?

Codeium at 2:25 pm, Jul 3, 2024

Certainly! To create a refreshSession Lambda function that works similarly to your signIn handler, you will use the InitiateAuth or AdminInitiateAuth (depending on your setup) method of AWS Cognito. Since you're working with refresh tokens, you'll likely want to use the REFRESH_TOKEN_AUTH auth flow. Here's a basic template for the refreshSession Lambda function:

// cdk/lambda/authentication/refreshSession.ts
import * as AWS from 'aws-sdk';
const cognito = new AWS.CognitoIdentityServiceProvider({ region: 'us-east-1' });

exports.handler = async (event: { body: string }) => {
  const body = typeof event.body === 'string' ? JSON.parse(event.body) : event.body;
  console.log('RefreshSession body:', body);

  try {
    const { refreshToken } = body;
    // Ensure ClientId is a string and not undefined
    const clientId = process.env.COGNITO_APP_CLIENT_ID;
    if (!clientId) {
      throw new Error('COGNITO_APP_CLIENT_ID environment variable is not set.');
    }
    if (!refreshToken) {
      throw new Error('Refresh token is required.');
    }

    const params = {
      AuthFlow: 'REFRESH_TOKEN_AUTH',
      ClientId: clientId,
      AuthParameters: {
        REFRESH_TOKEN: refreshToken,
      },
    };

    const data = await cognito.initiateAuth(params).promise();

    console.log('RefreshSession success:', JSON.stringify(data));

    const { IdToken, AccessToken } = data.AuthenticationResult ?? {};

    if (!IdToken || !AccessToken) {
      // Handle the missing tokens scenario
      return {
        statusCode: 400,
        body: JSON.stringify({ message: "Token refresh failed or incomplete." }),
      };
    }

    // Return the new tokens to the client
    const response = {
      statusCode: 200,
      body: JSON.stringify({
        IdToken,
        AccessToken,
      }),
      headers: {
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Credentials": true,
      },
    };
    return response;
  } catch (err: any) {
    console.error('RefreshSession error:', err);
    const response = {
      statusCode: 500,
      headers: {
        "Access-Control-Allow-Origin": "*",
        "Access-Control-Allow-Credentials": true,
      },
      body: JSON.stringify({ message: err.message || 'An error occurred during the token refresh process.' }),
    };

    return response;
  }
};

Key Points:

  • AuthFlow: This function uses the REFRESH_TOKEN_AUTH flow, which is specifically designed for refreshing the session using a refresh token.
  • Environment Variable: It assumes you have the COGNITO_APP_CLIENT_ID environment variable set in your Lambda function's configuration, similar to your signIn function.
  • Error Handling: The template includes basic error handling. You may want to customize this based on your application's specific error messaging and logging requirements.
  • CORS Headers: The response includes CORS headers to ensure this Lambda function can be called from web applications hosted on different domains. Adjust the "Access-Control-Allow-Origin" header according to your needs.

Remember to test this Lambda function thoroughly, including handling scenarios where the refresh token is invalid or expired.

User at 2:54 pm, Jul 3, 2024

My HandTerm.tsx React class component receives props from a useAuth.ts hook file:

export interface IHandTermProps {
 // Define the interface for your HandexTerm logic
 terminalWidth: number;
 auth: {
  login: (username: string, password: string, callback: (error: any, result: any) => void) => void;
  logout: () => void;
  isLoggedIn: boolean;
  signUp: (
   username: string,
   password: string,
   email: string,
   callback: (error: any, result: any) => void
  ) => void;
  getUser: () => any;
  setUser: (profile: string) => void;
  saveLog: (key: string, content: string) => boolean | null;
  changePassword: (
   oldPassword: string,
   newPassword: string,
   callback: (error: any, result: any) => void
  ) => void;
  // Add other properties returned by useAuth here
 };
}

Many of the functions in the useAuth are async functions.

How do I call them, or how do I pass them in?

Codeium at 2:54 pm, Jul 3, 2024

To use the async functions provided by your useAuth hook within a class component like HandTerm, you need to consider that these functions return promises. When calling these functions from your class component, you should handle them using either async/await syntax inside an async function or by using .then() and .catch() for promise resolution and error handling. However, directly marking component lifecycle methods or event handlers as async isn't always advisable due to potential unintended side effects or inconsistencies in behavior.

Given your useAuth hook functions are passed as props to HandTerm, here's how you can utilize them effectively:

1. Passing useAuth Functions as Props

You're already doing this according to the interface you defined. Ensure the parent component that uses HandTerm is a functional component that can utilize hooks. Then, pass the useAuth functions as props to HandTerm.

2. Calling Async Functions Inside HandTerm

To call an async function like login from an event handler in HandTerm, you can do something like this:

handleLoginAttempt = () => {
  const { login } = this.props.auth;
  const username = "user";
  const password = "pass";

  login(username, password, (error, result) => {
    if (error) {
      console.error("Login failed:", error);
    } else {
      console.log("Login successful:", result);
    }
  });
};

For functions that return a promise and do not use a callback pattern, you can wrap the call in an async function defined within the method where you need to call it. For example:

handleGetUser = () => {
  const { getUser } = this.props.auth;

  // Wrap in an immediately invoked async function since lifecycle methods cannot be async
  (async () => {
    try {
      const user = await getUser();
      console.log("Fetched user:", user);
    } catch (error) {
      console.error("Error fetching user:", error);
    }
  })();
};

3. Handling Promises Directly

For methods that return a promise and you prefer not to use async-await within an IIFE (Immediately Invoked Function Expression), you can handle them using .then() and .catch():

handleSaveLog = () => {
  const { saveLog } = this.props.auth;

  saveLog("logKey", "logContent")
    .then((result) => {
      console.log("Log saved successfully:", result);
    })
    .catch((error) => {
      console.error("Error saving log:", error);
    });
};

Best Practices

  • Error Handling: Always handle errors in your async operations to prevent uncaught promise rejections.
  • State Updates: If the result of an async operation updates the component's state, ensure the component is still mounted before calling setState to avoid warnings or errors about updating the state of an unmounted component.

Remember, since class components don't natively support hooks, passing down the functions from useAuth as props is a suitable workaround to leverage hook-based logic within them.

User at 3:13 pm, Jul 3, 2024

Currently, my getUser in useAuth looks like this:

 const getUser = async () => {
  try {
   // Make the request with the Access Token
   const authConfig = getAuthConfig();
   const response = await axios.get(`${API_URL}${ENDPOINTS.api.GetUser}`, await authConfig);
   return response.data; // Contains username, attributes, etc.
  } catch (error) {
   console.error('Error fetching current user:', error);
   return null;
  }
 };

Should I rewrite it?

I am trying to figure out hwo to call it from the command-line handler in HandTerm:

  const handleGetUser = () => {
   const { getUser } = this.props.auth;

   // Wrap in an immediately invoked async function since lifecycle methods cannot be async
   (async () => {
    try {
     const user = await getUser();
     console.log("Fetched user:", user);
    } catch (error) {
     console.error("Error fetching user:", error);
    }
   })();
  };
   
  if (command.startsWith('profile')) {
   if (args.length === 0) {
    const currentUser = handleGetUser();
    response = "Is logged in: " + currentUser.profile;
    console.log("profile", this.props.auth.isLoggedIn);
   } else {
    const content = args.join(' ');
    this.props.auth.setUser(content);
   }
  }

Codeium at 3:13 pm, Jul 3, 2024

Your getUser function in useAuth is structured correctly for an asynchronous operation using async/await syntax. The function makes an asynchronous call to fetch the user data and returns the response data. However, there's a minor adjustment needed; you shouldn't await authConfig directly within the axios.get call since authConfig is a function call that returns a promise. You handled it correctly by awaiting authConfig before passing it to axios.get, just ensure the syntax clearly reflects this asynchronous handling.

Regarding calling getUser from within HandTerm, the way you're invoking getUser using an immediately invoked async function (IIFE) inside handleGetUser is appropriate due to the constraints of class components and their inability to directly use async functions in event handlers or lifecycle methods.

However, there's a misunderstanding in how you're using the currentUser variable. Since handleGetUser does not return the user directly but instead logs the fetched user, attempting to use currentUser immediately after calling handleGetUser won't work as intended. The currentUser variable will be undefined because handleGetUser does not return anything, and the user data is fetched asynchronously.

To fix this, you could modify handleGetUser to return the user data, allowing you to use it within your command handler. Here's how you could adjust your approach:

Adjusting getUser and handleGetUser

First, you might not need to rewrite getUser, but ensure it's clear and handles asynchronous operations correctly:

const getUser = async () => {
  try {
    const authConfig = await getAuthConfig(); // Ensure this is awaited correctly
    const response = await axios.get(`${API_URL}${ENDPOINTS.api.GetUser}`, authConfig);
    return response.data; // Contains username, attributes, etc.
  } catch (error) {
    console.error('Error fetching current user:', error);
    return null; // Or throw an error up to be caught by the caller
  }
};

Next, for handleGetUser to be utilized effectively within if (command.startsWith('profile')), you need to make it so it can actually return the user data. Since this involves asynchronous logic, you'd need to adjust how you handle commands that require async operations.

One approach is to use state in your HandTerm component to store the current user and trigger handleGetUser accordingly. However, if you're handling a command that requires immediate processing and can't directly work with React's asynchronous state updates, you might consider restructuring your command handling logic to work asynchronously.

Proposed Solution

Given the constraints, here's a conceptual approach that might work better:

  1. Refactor Command Handling: If possible, refactor your command handling to be asynchronous. This might involve significant changes in how you handle commands and their responses, especially if the responses depend on asynchronous operations.

  2. Use State for User Data: Store the user data in the component's state. This way, when the command to fetch the user is processed, you update the state with the fetched user data. This requires your component to be able to re-render upon fetching the user data and then displaying the updated information accordingly.

Final Thoughts

Directly returning and using currentUser right after handleGetUser() won't work due to its asynchronous nature. You'll need to rethink how you're structuring these operations within your class component, potentially leveraging state, context, or other patterns to bridge the gap between asynchronous data fetching and synchronous command handling.

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