Скачать или смотреть How to Pass Request Object into Super Call in NestJS for JWT Strategy

Discover how to effectively use the `cookieExtractor` function in NestJS's JWT strategy without directly passing the `Request` object.
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How to Pass Request Object into Super Call in NestJS for JWT Strategy

Working with NestJS and integrating authentication can sometimes be complex, especially when dealing with JWT strategies. A common question arises about how to properly handle the Request object within the cookieExtractor function when setting it up in the super call of a JwtStrategy class. Let's dive into the problem and the solution step-by-step.

The Problem

In a typical setup, you might encounter a situation like this when defining a JwtStrategy in NestJS:

[[See Video to Reveal this Text or Code Snippet]]

You want to pass the req object into the cookieExtractor for extracting the JWT from cookies. However, this approach has its pitfalls, leading to confusion about how to do it correctly.

Understanding the cookieExtractor Function

Before diving into the solution, it's essential to understand how the cookieExtractor function works. Here's how it's typically defined:

[[See Video to Reveal this Text or Code Snippet]]

This function checks if the req object exists and then attempts to retrieve the access-token from the cookies of the request. The challenge is that you shouldn't need to directly pass the Request object into this function when setting it as a property in the super call.

The Solution

Instead of trying to pass the req object directly to the cookieExtractor, you should modify your code as follows:

[[See Video to Reveal this Text or Code Snippet]]

Why This Works

Function Reference: By supplying cookieExtractor without the parentheses (), you are passing a reference to the function rather than the result of the function call. Passport will call the cookieExtractor function later with the correct Request object internally, meaning you don't need to handle it yourself.

Compatibility: The cookieExtractor correctly implements the JwtFromRequestFunction interface that Passport expects. This ensures that it will function as intended when invoked later within the authentication process.

Key Takeaways

Avoid Passing req: Always pass function references instead of calling the function when configuring JWT strategies.

Trust the Library: Frameworks like Passport will handle the request context for you. Rely on this behavior rather than trying to manage it manually.

Simplifying Code: Keeping things straightforward not only makes the code easier to read but also reduces potential errors in handling requests.

By following these guidelines, you can effectively manage JWT authentication in your NestJS application without unnecessary complications. With a clear understanding of how to utilize the cookieExtractor, you can streamline your authentication process while adhering to best practices.