Retrofit2 Authorization - Global Interceptor for access token

Question

I\'m trying to use Retrofit2, I want to add Token to my Header Like this:

Authorization: Bearer Token but the <

Answer 1

You will need to add an Interceptor into the OkHttpClient.

Add a class called OAuthInterceptor.

class OAuthInterceptor(private val tokenType: String, private val accessToken: String) : Interceptor {
    override fun intercept(chain: Interceptor.Chain): okhttp3.Response {
        var request = chain.request()
        request = request.newBuilder().header("Authorization", "$tokenType $accessToken").build()

        return chain.proceed(request)
    }
}

Following that, when you initialise your RetrofitApiService interface, you will need this.

interface RetrofitApiService {
    companion object {
        private const val BASE_URL = "https://api.coursera.org/api/businesses.v1/"
        fun create(accessToken: String): RetrofitApiService {
            val client = OkHttpClient.Builder()
                    .addInterceptor(OAuthInterceptor("Bearer", accessToken))
                    .build()

            val retrofit = Retrofit.Builder()
                    .addConverterFactory(GsonConverterFactory.create())
                    .baseUrl(BASE_URL)
                    .client(client)
                    .build()

            return retrofit.create(RetrofitApiService::class.java)
        }
    }
}

Shout out to Java Code Monk, and visit the reference link for more details. https://www.javacodemonk.com/retrofit-oauth2-authentication-okhttp-android-3b702350