Monthly Archives: June 2014

oAuth2 with Android (Part 3)

This is the fifth post in the series over oAuth with Symfony2, iOS and Android. All posts in this serie can be found here. With this post we are finishing up the android app as much as possible with the ability to add new items (Via the API) and adding items we got from the API into the list. All code from this post can be found here at Github. Because wordpress doesn’t seem to work that well with the included code in this blog, I suggest to use the code from the repository. I created a tag in the repo for the part that was at the end of this third part. Lets start with adding a new Demo. This can be done by sending a POST request to api.host/demos. Before we start with creating the demos, we need to fix a issue in our requests. Volley standard adds a Content-Type with post. We don’t want this Content-Type because we send JSON, not a form. We also added by default a Content-Type header, but that causes issues if data isn’t JSON, or if we send POST, because Volley automatically adds the Content-Type as well. AbstractRequest.java:

package sohier.me.saiod.android;

import android.util.Log;

import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.Response;
import com.google.api.client.auth.oauth2.Credential;
import com.google.gson.Gson;

import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;

public abstract class AbstractRequest extends Request {

    private final Map headers;
    private final Response.Listener listener;

    protected Object bodyObject = null;

    /**
     * Create the URL for calling the API.
     * @param HOST Hostname
     * @param cred Credentials for the oAuth api.
     * @param url The path for the API.
     * @return full URL.
     */
    private static String makeUrl(String HOST, Credential cred, String url) {
        url = HOST + url;
        url += "?access_token=";
        url += cred.getAccessToken();

        Log.d("AbstractRequest", "URL: " + url);

        return url;
    }

    /**
     *
     * @param method HTTP method
     * @param path Path of the call
     * @param host hostname
     * @param creds Credentials
     * @param headers Headers for the HTTP request
     * @param listener Response listener
     * @param errorListener error Listener
     */
    public AbstractRequest(int method, String path, String host, Credential creds, Map headers, Response.Listener listener, Response.ErrorListener errorListener) {
        super(method, makeUrl(host, creds, path), errorListener);

        if (headers == null) {
            headers = new HashMap();
        }
        headers.put("Accept", "application/json");

        this.headers = headers;
        this.listener = listener;
    }

    @Override
    public Map getHeaders() throws AuthFailureError {
        return headers != null ? headers : super.getHeaders();
    }

    @Override
    protected void deliverResponse(T response) {
        listener.onResponse(response);
    }

    @Override
    public byte[] getBody() throws AuthFailureError
    {
        if (bodyObject == null)
        {
            return super.getBody();
        }
        Gson gson = new Gson();

        try {
            Log.d("saiod", new String(gson.toJson(bodyObject).getBytes("utf-8")));

            byte[] bt = gson.toJson(bodyObject).getBytes("utf-8");
            return bt;
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
            throw new RuntimeException(e);

        }
    }
}

Continue reading oAuth2 with Android (Part 3)