Android Networking: Beyond the Basics
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Most server APIs require you to send an authorization token, whenever you’re trying to access an endpoint that requires a user id or email. This is why you’ve sent the user token as a header parameter in many requests. But it would be a cool thing if you could automatically send the token, once you’re logged in, right? Well, you can, using interceptors!
Demo
Open the RetrofitBuilders.kt file, and start by adding this constant, to represent the authorization header:
private const val HEADER_AUTHORIZATION = "Authorization"
.addInterceptor(buildAuthorizationInterceptor())
fun buildAuthorizationInterceptor() = object : Interceptor {
override fun intercept(chain: Interceptor.Chain): Response {
val originalRequest = chain.request()
if (App.getToken().isBlank()) return chain.proceed(originalRequest)
val new = originalRequest.newBuilder()
.addHeader(HEADER_AUTHORIZATION, App.getToken())
.build()
return chain.proceed(new)
}
}
@GET("/api/note")
fun getNotes(): Call<GetTasksResponse>
@GET("/api/user/profile")
fun getMyProfile(): Call<UserProfileResponse>
@POST("/api/note/complete")
fun completeTask(@Query("id") noteId: String): Call<CompleteNoteResponse>
@POST("/api/note")
fun addTask(@Body request: AddTaskRequest): Call<Task>