Wasp•2w ago

how can i create a custom global middleware almost same with the user authenticated middleware

i need to pass new data in context similar how can i get the user in context in action and query

10 Replies

Hi @victor. I'm kapa.ai, your friendly support bot. I will try to answer your question by searching through the knowledge base. :wave: ---------------------- To create a custom global middleware similar to the user authentication middleware in Wasp, you can use the middlewareConfigFn in your server configuration. This allows you to modify the middleware stack for all operations and APIs, including the ability to inject custom data into the context. Here's how you can do it: 1. First, define your custom middleware function in a server-side file, for example, src/serverSetup.js or src/serverSetup.ts. 2. Then, configure the global middleware in your main.wasp file:

app todoApp {
  // ...
  server: {
    setupFn: import setup from "@src/serverSetup",
    middlewareConfigFn: import { serverMiddlewareFn } from "@src/serverSetup"
  },
}

app todoApp {
  // ...
  server: {
    setupFn: import setup from "@src/serverSetup",
    middlewareConfigFn: import { serverMiddlewareFn } from "@src/serverSetup"
  },
}

3. In your serverSetup.js or serverSetup.ts file, implement the serverMiddlewareFn:

export const serverMiddlewareFn = (middlewareConfig) => {
  const customMiddleware = (req, res, next) => {
    // Your custom logic here
    // For example, adding custom data to the context:
    req.context = req.context || {};
    req.context.customData = 'Some custom data';
    next();
  };

  // Add your custom middleware to the config
  middlewareConfig.set('custom.middleware', customMiddleware);

  return middlewareConfig;
};

export const serverMiddlewareFn = (middlewareConfig) => {
  const customMiddleware = (req, res, next) => {
    // Your custom logic here
    // For example, adding custom data to the context:
    req.context = req.context || {};
    req.context.customData = 'Some custom data';
    next();
  };

  // Add your custom middleware to the config
  middlewareConfig.set('custom.middleware', customMiddleware);

  return middlewareConfig;
};

This custom middleware will be applied globally, similar to how the authentication middleware works. The custom data you add to req.context will be available in your actions and queries through the context parameter. To access this custom data in your actions and queries, you can use it like this:

export const someAction = async (args, context) => {
  console.log(context.customData); // 'Some custom data'
  // Rest of your action logic
};

export const someAction = async (args, context) => {
  console.log(context.customData); // 'Some custom data'
  // Rest of your action logic
};

Remember that this approach modifies the global middleware, which affects all operations and APIs. Use it with caution, as noted in the Wasp documentation on configuring middleware. For more detailed information on customizing middleware in Wasp, you can refer to the Wasp documentation on configuring middleware. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @victor, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

victorOP•2w ago

@kapa.ai how can i add new data in context without overwriting the context

MEE6•2w ago

Wohooo @victor, you just became a Waspeteer level 2!

victorOP•2w ago

@kapa.ai how can i add new data in context without overwriting the context

kapa.ai•2w ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- To add new data to the context without overwriting the existing context in Wasp, you can extend the existing context object instead of replacing it entirely. Here's how you can do this: 1. First, set up your custom middleware as described in the previous answer. 2. In your serverSetup.js or serverSetup.ts file, implement the serverMiddlewareFn like this:

export const serverMiddlewareFn = (middlewareConfig) => {
  const customMiddleware = (req, res, next) => {
    // Ensure the context object exists
    req.context = req.context || {};
    
    // Add your custom data to the existing context
    req.context.customData = 'Some custom data';
    
    // You can add multiple properties
    req.context.anotherCustomProperty = 'Another value';
    
    next();
  };

  // Add your custom middleware to the config
  middlewareConfig.set('custom.middleware', customMiddleware);

  return middlewareConfig;
};

export const serverMiddlewareFn = (middlewareConfig) => {
  const customMiddleware = (req, res, next) => {
    // Ensure the context object exists
    req.context = req.context || {};
    
    // Add your custom data to the existing context
    req.context.customData = 'Some custom data';
    
    // You can add multiple properties
    req.context.anotherCustomProperty = 'Another value';
    
    next();
  };

  // Add your custom middleware to the config
  middlewareConfig.set('custom.middleware', customMiddleware);

  return middlewareConfig;
};

This approach ensures that you're adding new properties to the existing context object rather than overwriting it. The user object and other properties that Wasp adds to the context will remain intact. Now, in your actions and queries, you can access both the Wasp-provided context data (like user) and your custom data:

export const someAction = async (args, context) => {
  console.log(context.user); // The user object provided by Wasp
  console.log(context.customData); // 'Some custom data'
  console.log(context.anotherCustomProperty); // 'Another value'
  // Rest of your action logic
};

export const someAction = async (args, context) => {
  console.log(context.user); // The user object provided by Wasp
  console.log(context.customData); // 'Some custom data'
  console.log(context.anotherCustomProperty); // 'Another value'
  // Rest of your action logic
};

This method allows you to extend the context with your custom data without interfering with the existing context properties that Wasp provides. Remember that this approach modifies the global middleware, which affects all operations and APIs. Use it judiciously and be aware of potential performance implications when adding complex or large amounts of data to the context. For more information on working with actions and context in Wasp, you can refer to the Wasp documentation on Actions. Wasp documentation on Actions ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @victor, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

victorOP•2w ago

@kapa.ai that is not working

kapa.ai•2w ago

Let me check the knowledge base for you again. One moment! :books: ---------------------- I apologize that the previous suggestion didn't work for you. To better assist you, could you please provide more details about what specifically isn't working? Are you encountering any error messages, or is the custom data not appearing in the context as expected? Without more information about your specific implementation and the issues you're facing, it's difficult to pinpoint the problem. The approach I suggested is based on the general Wasp framework capabilities, but there might be nuances in your particular setup that we need to consider. If you could share: 1. The exact code you've implemented 2. Any error messages you're seeing 3. What behavior you're observing vs. what you expected This would help me provide a more accurate and tailored solution to your problem. Also, it's worth noting that the Wasp framework is continually evolving, and there might have been recent changes that affect this functionality. If you're using a newer version of Wasp, some behaviors might have changed. If you provide more details, I'll do my best to help you resolve the issue or suggest an alternative approach that works with your current Wasp setup. ---------------------- Note: you can ask me a follow up question by @ mentioning me again :speech_balloon: ---------------------- Sorry @victor, I seem to be having a bit of trouble. Don't worry though, I've pinged my support and they will try to fix me up! :technologist: Perhaps try again in 15mins?

matijash•2w ago

@victor can you share a bit more on what you'd like to achieve? Is there a reason you can't forward your data using req?

victorOP•2w ago

@matijash thanks for you reply i want to add new data in the context similar on how can i get the authenticated user in context in server action and query i tried to forward it to req but i can't manage to get it to action and query

matijash•2w ago

Can you share what you're trying to do, along with your code for defining and invoking action/query? that will help us debug 🙂

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how can i create a custom global middleware almost same with the user authenticated middleware

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