Code for the article: "Authorization and retrying of web requests for OkHttp and Retrofit"

TokenRefreshAuthenticator.kt

class TokenRefreshAuthenticator(
    private val authorizationRepository: AuthorizationRepository
) : Authenticator {
    override fun authenticate(route: Route?, response: Response): Request? = when {
        response.retryCount > 2 -> null
        else -> response.createSignedRequest()
    }

    private fun Response.createSignedRequest(): Request? = try {
        val accessToken = authenticationRepository.fetchFreshAccessToken()
        request.signWithToken(accessToken)
    } catch (error: Throwable) {
        Logger.error(error, "Failed to re-sign request")
        null
    }
}