QuizletUploadHelper.java

package org.liberty.android.fantastischmemo.downloader.quizlet;

import android.util.Log;

import org.apache.commons.io.IOUtils;
import org.liberty.android.fantastischmemo.common.AnyMemoDBOpenHelper;
import org.liberty.android.fantastischmemo.common.AnyMemoDBOpenHelperManager;
import org.liberty.android.fantastischmemo.dao.CardDao;
import org.liberty.android.fantastischmemo.entity.Card;

import java.io.File;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLEncoder;
import java.util.List;

import javax.net.ssl.HttpsURLConnection;

class QuizletUploadHelper {
    private static final String TAG = QuizletUploadHelper.class.getSimpleName();

    /**
     * Upload cardsets list to Quizlet from a db file
     * 
     * @param db
     *            file
     * @param authToken
     *            oauth token
     * @return null
     * @throws IOException
     *             IOException If http response code is not 2xx
     */
    public void uploadToQuizlet(File file, String authToken) throws IOException {
        // First read card because if it failed we don't even bother uploading.
        AnyMemoDBOpenHelper helper = AnyMemoDBOpenHelperManager.getHelper(file
                .getAbsolutePath());
        List<Card> cardList = null;
        try {
            final CardDao cardDao = helper.getCardDao();
            cardList = cardDao.queryForAll();
        } finally {
            AnyMemoDBOpenHelperManager.releaseHelper(helper);
        }

        // Following doing upload
        StringBuilder data = new StringBuilder();
        data.append(String.format("whitespace=%s",
                URLEncoder.encode("1", "UTF-8")));
        data.append(String.format("&title=%s",
                URLEncoder.encode(file.getName(), "UTF-8")));

        // Get cards from cardList
        for (int i = 0; i < cardList.size(); i++) {
            Card c = cardList.get(i);
            data.append(String.format("&terms[]=%s",
                    URLEncoder.encode(c.getQuestion(), "UTF-8")));
            data.append(String.format("&definitions[]=%s",
                    URLEncoder.encode(c.getAnswer(), "UTF-8")));
        }

        data.append(String.format("&lang_terms=%s",
                URLEncoder.encode("en", "UTF-8")));
        data.append(String.format("&lang_definitions=%s",
                URLEncoder.encode("en", "UTF-8")));
        data.append(String.format("&allow_discussion=%s",
                URLEncoder.encode("true", "UTF-8")));

        URL url = new URL("https://api.quizlet.com/2.0/sets");
        makePostApiCall(url, data.toString(), authToken);
    }

    /**
     * Make Post API call to Quizlet server with oauth
     * 
     * @param url
     *            API call endpoint
     * @param post
     *            content
     * @param authToken
     *            oauth auth token
     * @throws IOException
     *             If http response code is not 2xx
     */
    private void makePostApiCall(URL url, String content, String authToken)
            throws IOException {
        HttpsURLConnection conn = null;
        OutputStreamWriter writer = null;
        try {
            conn = (HttpsURLConnection) url.openConnection();
            conn.setDoInput(false);
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.addRequestProperty("Authorization", "Bearer " + authToken);
            conn.setRequestProperty("Content-Type",
                    "application/x-www-form-urlencoded");

            writer = new OutputStreamWriter(conn.getOutputStream());
            writer.write(content);
            writer.close();

            if (conn.getResponseCode() / 100 >= 3) {
                Log.v(TAG, "Post content is: " + content);
                Log.v(TAG, "Error string is: "
                        + new String(IOUtils.toByteArray(conn.getErrorStream())));
                throw new IOException("Response code: "
                        + conn.getResponseCode() + " URL is: " + url);
            }
        } finally {
            conn.disconnect();
        }
    }
}