Retrofit2/OkHttp3 Cookies (Drag and Drop, One Size Fits 99%)

AddCookiesInterceptor.java

// Original written by tsuharesu
// Adapted to create a "drop it in and watch it work" approach by Nikhil Jha.
// Just add your package statement and drop it in the folder with all your other classes.

import android.content.Context;
import android.preference.PreferenceManager;
import android.util.Log;

import java.io.IOException;
import java.util.HashSet;

import okhttp3.Interceptor;
import okhttp3.Request;
import okhttp3.Response;

/**
 * This interceptor put all the Cookies in Preferences in the Request.
 * Your implementation on how to get the Preferences may ary, but this will work 99% of the time.
 */
public class AddCookiesInterceptor implements Interceptor {
    public static final String PREF_COOKIES = "PREF_COOKIES";
    // We're storing our stuff in a database made just for cookies called PREF_COOKIES.
    // I reccomend you do this, and don't change this default value.
    private Context context;

    public AddCookiesInterceptor(Context context) {
        this.context = context;
    }

    @Override
    public Response intercept(Interceptor.Chain chain) throws IOException {
        Request.Builder builder = chain.request().newBuilder();

        HashSet<String> preferences = (HashSet<String>) PreferenceManager.getDefaultSharedPreferences(context).getStringSet(PREF_COOKIES, new HashSet<String>());
        
        // Use the following if you need everything in one line.
        // Some APIs die if you do it differently.
        /*String cookiestring = "";
        for (String cookie : preferences) {
            String[] parser = cookie.split(";");
            cookiestring = cookiestring + parser[0] + "; ";
        }
        builder.addHeader("Cookie", cookiestring);
        */
        
        for (String cookie : preferences) {
          builder.addHeader("Cookie", cookie);
        }

        return chain.proceed(builder.build());
    }
}

RecievedCookiesInterceptor.java

// Original written by tsuharesu
// Adapted to create a "drop it in and watch it work" approach by Nikhil Jha.
// Just add your package statement and drop it in the folder with all your other classes.

import android.content.Context;
import android.content.SharedPreferences;
import android.preference.PreferenceManager;

import java.io.IOException;
import java.util.HashSet;

import okhttp3.Interceptor;
import okhttp3.Response;

public class ReceivedCookiesInterceptor implements Interceptor {
    private Context context;
    public ReceivedCookiesInterceptor(Context context) {
        this.context = context;
    } // AddCookiesInterceptor()
    @Override
    public Response intercept(Chain chain) throws IOException {
        Response originalResponse = chain.proceed(chain.request());

        if (!originalResponse.headers("Set-Cookie").isEmpty()) {
            HashSet<String> cookies = (HashSet<String>) PreferenceManager.getDefaultSharedPreferences(context).getStringSet("PREF_COOKIES", new HashSet<String>());

            for (String header : originalResponse.headers("Set-Cookie")) {
                cookies.add(header);
            }

            SharedPreferences.Editor memes = PreferenceManager.getDefaultSharedPreferences(context).edit();
            memes.putStringSet("PREF_COOKIES", cookies).apply();
            memes.commit();
        }

        return originalResponse;
    }
}

UsageSample.java

// By Nikhil Jha
// License MIT

// DON'T ADD THIS FILE TO YOUR OTHER CLASSES
// THIS IS AN EXAMPLE TO TEACH YOU HOW TO MAKE REQUESTS WITH THE MAGIC COOKIES

        OkHttpClient client = new OkHttpClient();
        OkHttpClient.Builder builder = new OkHttpClient.Builder();

        builder.addInterceptor(new AddCookiesInterceptor(context)); // VERY VERY IMPORTANT
        builder.addInterceptor(new ReceivedCookiesInterceptor(context)); // VERY VERY IMPORTANT
        client = builder.build();

        Retrofit retrofit = new Retrofit.Builder()
                .baseUrl("my-base") // REQUIRED
                .client(client) // VERY VERY IMPORTANT
                .addConverterFactory(GsonConverterFactory.create())
                .build(); // REQUIRED

        Your.ThingyClass = retrofit.create(Your.ThingyClass.class);

        Call<...> call = yourclass.somecall(new yourclass(example, example));

@makiabuan the interceptors needs to be added once in the http client. Make sure that all requests are using the same okhttp client.
You do not need to call anything. The interceptor does the work by itself.

Thank you very much, This work for me.

Lifesaver !! Thank you.

Anyone has problem on Android Pie with these interceptors? It seems that they are not triggered on Android 9, on other versions it works perfectly..

It seems that the problem was in CertificateFactory.getInstance("X.509", "BC"), X.509 is not found for Android 9. CertificateFactory.getInstance("X509") is the fix.

Thanks, Worked for me

Thanks Bro, its working.. :)

Great help. Thanks Bro.

yo bro thanks ,,, its working, you saved my ass :D

Great help. Thanks

I'm using hilt and am struggling to make 'context' available. Any suggestions?

I got it. My problem was trying to use @ApplicationContext as is (@ApplicationContext context: ApplicationContext). It works fine if you leave it as Context (@ApplicationContext context: Context)

I've pulled everything together for a Hilt-based solution at https://stackoverflow.com/questions/67950681/using-cookies-with-retrofit-and-hilt-and-recommended-architecture