AccessTokenInterceptor.kt

class AccessTokenInterceptor : Interceptor {

    override fun intercept(chain: Interceptor.Chain): Response = chain
        .request()
        .newBuilder()
        .let { builder ->
            val accessToken = accountRepository.accessToken ?: ""
            builder.setAuthHeader(builder, accessToken)
        }
        .build()
        .let { chain.proceed(it) }
}

fun Request.Builder.setAuthHeader(builder: Request.Builder, accessToken: String): Request.Builder {
    builder.header("Authorization", "Bearer $accessToken")
    return builder
}