API.java

package by.fksis.schedule;

import android.content.Context;
import android.content.SharedPreferences;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;

public final class API {
    private static String username = null, accessKey = null;
    private static final String SHARED_PREFERENCES_NAME = "credentials";
    private static final String API_ROOT_URL = "http://fksis.bsuir.by/wps/schedule/api";

    public static boolean credentialsPresent() {
        return username != null;
    }

    public static void loadCredentials(Context context) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
        username = sharedPreferences.getString("username", null);
        accessKey = sharedPreferences.getString("accessKey", null);
    }

    public static void updateCredentials(Context context, String username, String accessKey) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
        sharedPreferences.edit()
                .putString("username", username)
                .putString("accessKey", accessKey)
                .commit();
        loadCredentials(context);
    }
    public static void clearCredentials(Context context) {
        SharedPreferences sharedPreferences = context.getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
        sharedPreferences.edit()
                .remove("username")
                .remove("accessKey")
                .commit();
        loadCredentials(context);
    }

    public static String getUsername() {
        return username;
    }

    @SuppressWarnings("deprecation")
    public static String query(HashMap<String, String> params) throws IOException {
        try {
            String url = API_ROOT_URL + "?_";
            for (String key : params.keySet())
                url += "&" + URLEncoder.encode(key) + "=" + URLEncoder.encode(params.get(key));
            String data = "", nextLine;
            BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(new URL(url).openStream()));
            while ((nextLine = bufferedReader.readLine()) != null)
                data += nextLine;
            return data;
        } catch (MalformedURLException e) {
            e.printStackTrace();
            return null;
        }
    }

    public static JSONObject queryUserData() throws IOException, JSONException {
        HashMap<String, String> params = new HashMap();
        params.put("info", "1");
        params.put("auth_login", username);
        params.put("auth_key", accessKey);
        return new JSONObject(query(params));
    }

    public static JSONArray queryClasses() throws IOException, JSONException {
        HashMap<String, String> params = new HashMap();
        params.put("classes", "1");
        return new JSONArray(query(params));
    }

    public static JSONArray queryBroadcasts() throws IOException, JSONException {
        HashMap<String, String> params = new HashMap();
        params.put("broadcasts", "1");
        return new JSONArray(query(params));
    }

    public static void queryAddBroadcast(String text, long date) throws IOException, JSONException {
        HashMap<String, String> params = new HashMap();
        params.put("addBroadcast", "1");
        params.put("auth_login", username);
        params.put("auth_key", accessKey);
        params.put("text", text);
        params.put("expires", Long.toString(date));
        query(params);
    }
}