Call a function before/after each Alamofire request

Question

I'd like to know if there is anyway to implement something akin to middleware using Alamofire and iOS.

I've got a slew of API calls that are all pretty similar, and they all require a valid json web token for authentication. I want to perform the same validation before every API call, or alternately take the same corrective action when any API call fails. Is there a way I can configure it so that I don't have to copy and paste the same chunk of code onto the beginning or end of all of the API calls?

Answer 1

Wrapper Class

You can create a wrapper for your request.

class AlamofireWrapper {
    static func request(/*all the params you need*/) {
        if tokenIsValidated() { //perform your web token validation
            Alamofire.request//...
            .respone { /*whatever you want to do with the response*/ }
        }
    }
}

You can use it like this wihtout having to copy and paste the same code again.

AlamofireWrapper().request(/*params*/)

Extension

This is not tested. You can add an extension to Alamofire

extension Alamofire {
    func validatedRequest(/*all the params you need*/) {
        if tokenIsValidated() { //perform your web token validation
            Alamofire.request//...
            .respone { /*whatever you want to do with the response*/ }
        }
    }
}

and use it like this

Alamofire.validatedRequest(/*params*/)