Refresh token

AuthInterceptor.kt

package com.cg.pandago.vender.data.http

import com.cg.pandago.vender.BuildConfig
import com.cg.pandago.vender.PandaGoVendorApp
import com.cg.pandago.vender.data.local.SharedPreferenceHelper
import com.cg.pandago.vender.model.Authorize
import com.cg.pandago.vender.util.Constant
import com.google.gson.Gson
import com.google.gson.JsonObject
import kotlinx.coroutines.InternalCoroutinesApi
import kotlinx.coroutines.internal.synchronized
import okhttp3.*
import okhttp3.MediaType.Companion.toMediaType
import org.json.JSONObject

class AuthInterceptor : Interceptor {

    @InternalCoroutinesApi
    override fun intercept(chain: Interceptor.Chain): Response {
        var request: Request = chain.request()
        val builder: Request.Builder = request.newBuilder()
        builder
            .addHeader("Accept", "application/json")
            .addHeader("Content-Type", "application/x-www-form-urlencoded")

        val accessToken: String = SharedPreferenceHelper.getInstance(PandaGoVendorApp.appContext).getAccessToken()
        val privateToken : String = SharedPreferenceHelper.getInstance(PandaGoVendorApp.appContext).getPrivateAccessToken()
        builder.header("Authorize", accessToken)
        builder.header("Auth", privateToken)
        request = builder.build()
        val response = chain.proceed(request)
        if (response.code == 401) {
            response.close()
            synchronized(this) {
                val currentToken: String = SharedPreferenceHelper.getInstance(PandaGoVendorApp.appContext).getAccessToken()
                if (currentToken == accessToken) {
                    builder.header("Authorize", refreshToken())
                    request = builder.build()
                    return chain.proceed(request)
                }
            }
        }
        return response
    }

    private fun refreshToken(): String {
        val jsonObject = JsonObject()
        jsonObject.addProperty(Constant.Device.DEVICE_OS, Constant.Device.ANDROID)
        jsonObject.addProperty(Constant.Device.DEVICE_NAME,  android.os.Build.MODEL)
        val mediaType = "application/json; charset=utf-8".toMediaType()

        val body: RequestBody = RequestBody.create(mediaType, jsonObject.toString())
        val client: OkHttpClient = OkHttpClient.Builder().build()
        val request: Request = Request.Builder()
                .url(BuildConfig.BASE_URL + "authorize")
                .post(body = body)
                .build()
        val response = client.newCall(request).execute()
        return if(response.code == 200) {
            val json = JSONObject(response.body!!.string())
            val data =  Gson().fromJson(json["data"].toString(), Authorize::class.java)
            data.token.toString()
        } else {
            ""
        }
    }
}