Insert Authorization Header field with kingfisher lib

Centralised and reliable way to pass custom headers to all the image requests.

No option required for all setImage(with:,option:) call

class TokenPlugin: ImageDownloadRequestModifier {
    let token:String

    init(token:String) {
        self.token = token
    }

    func modified(for request: URLRequest) -> URLRequest? {
        var request = request
        request.addValue(token, forHTTPHeaderField: "token")
        return request
    }
}

Config

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    KingfisherManager.shared.defaultOptions = [.requestModifier(TokenPlugin(token:"abcdef123456"))]
}

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    let modifier = AnyModifier { request in
        var req = request
        req.addValue("your_token", forHTTPHeaderField: "authorization")
        return req
    }
    
    
    KingfisherManager.shared.defaultOptions += [
        .requestModifier(modifier)
    ]}

Swift 5 + Kingfisher 7.1.2 tested on Xcode 13.2.1

With Kingfisher you need to make a request modifier (of type AnyModifier) and pass it as a parameter in the options part of the .kf.setImage method, and then use the trailing closure to actually set the image.

-> Because I use Firebase, I use getFirebaseToken()

extension UIImageView {
    
    func loadImage(from url: URL, placeHolderImage: UIImage? = nil) {
        let modifier = AnyModifier { request in
            var r = request
            if let firebaseToken = AccountManager.shared.getFirebaseToken() {
                r.setValue("Bearer \(firebaseToken)", forHTTPHeaderField: "Authorization")
            }
            return r
        }
        self.kf.setImage(with: url, placeholder: placeHolderImage, options: [.requestModifier(modifier), .forceRefresh])
    }
}