com.mvcoding.financius.api.EndpointAuthenticator.java Source code

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Here is the source code for com.mvcoding.financius.api.EndpointAuthenticator.java

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/*
 * Copyright (C) 2015 Mantas Varnagiris.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

package com.mvcoding.financius.api;

import android.content.Context;
import android.support.annotation.NonNull;

import com.google.android.gms.auth.GoogleAuthException;
import com.google.android.gms.auth.GoogleAuthUtil;
import com.google.common.base.Strings;
import com.mvcoding.financius.ApplicationContext;
import com.mvcoding.financius.BuildConfig;
import com.squareup.okhttp.Authenticator;
import com.squareup.okhttp.Request;
import com.squareup.okhttp.Response;

import java.io.IOException;
import java.net.Proxy;

import javax.inject.Inject;

public class EndpointAuthenticator implements Authenticator {
    private final Context context;
    private final Session session;

    @Inject
    public EndpointAuthenticator(@ApplicationContext @NonNull Context context, @NonNull Session session) {
        this.context = context;
        this.session = session;
    }

    @Override
    public Request authenticate(Proxy proxy, Response response) throws IOException {
        String token = session.isLoggedIn() ? session.getToken() : null;
        boolean alreadyHadToken = !Strings.isNullOrEmpty(token);
        if (!alreadyHadToken) {
            token = getNewToken();
        }

        boolean isNoTokenOrAlreadyRetried = Strings.isNullOrEmpty(token)
                || !Strings.isNullOrEmpty(response.request().header("Retry"));
        if (isNoTokenOrAlreadyRetried) {
            return null;
        }

        if (alreadyHadToken) {
            token = getNewToken();
        }

        session.setToken(token);

        return response.request().newBuilder().header("Authorization", session.getTokenForRequest())
                .header("Retry", "true").build();
    }

    @Override
    public Request authenticateProxy(Proxy proxy, Response response) throws IOException {
        return null;
    }

    private String getNewToken() throws IOException {
        try {
            return GoogleAuthUtil.getToken(context.getApplicationContext(), session.getEmail(),
                    "audience:server:client_id:" + BuildConfig.ENDPOINT_WEB_CLIENT_ID);
        } catch (GoogleAuthException e) {
            e.printStackTrace();
        }
        return null;
    }
}