ilearnrw.utils.ServerHelperClass.java Source code

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Here is the source code for ilearnrw.utils.ServerHelperClass.java

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package ilearnrw.utils;

/*
 * Copyright (c) 2015, iLearnRW. Licensed under Modified BSD Licence. See licence.txt for details.
 */
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.commons.io.IOUtils;
import org.json.JSONObject;

public class ServerHelperClass {
    private static String baseUrl = "http://api.ilearnrw.eu/ilearnrw/";

    private final static String USER_AGENT = "Mozilla/5.0";;

    // HTTP GET request
    public static String sendGet(String link) throws Exception {
        String url = baseUrl + link;
        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();
        // optional default is GET
        con.setRequestMethod("GET");
        con.setRequestProperty("Authorization", userNamePasswordBase64("api", "api"));
        //con.setRequestProperty("User-Agent", USER_AGENT);

        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();
        return response.toString();
    }

    // HTTP POST request
    public static String sendPost(String link, String urlParameters) throws Exception {
        String url = baseUrl + link;

        URL obj = new URL(url);
        HttpURLConnection con = (HttpURLConnection) obj.openConnection();

        con.setRequestMethod("POST");
        con.setRequestProperty("Authorization", userNamePasswordBase64("api", "api"));

        con.setRequestProperty("Content-Type", "application/json;charset=utf-8");
        con.setDoOutput(true);
        OutputStreamWriter wr = new OutputStreamWriter(con.getOutputStream(), "UTF8");

        wr.write(urlParameters);
        wr.flush();
        wr.close();
        int responseCode = con.getResponseCode();
        System.out.println("\nSending 'POST' request to URL : " + url);
        System.out.println("Post parameters : " + urlParameters);
        System.out.println("Response Code : " + responseCode);

        BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream(), "UTF-8"));
        String inputLine;
        StringBuffer response = new StringBuffer();

        while ((inputLine = in.readLine()) != null) {
            response.append(inputLine);
        }
        in.close();

        return response.toString();
    }

    public static String userNamePasswordBase64(String username, String password) {
        return "Basic " + base64Encode(username + ":" + password);
    }

    private final static char base64Array[] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
            'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
            'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2',
            '3', '4', '5', '6', '7', '8', '9', '+', '/' };

    private static String base64Encode(String string) {
        String encodedString = "";
        byte bytes[] = string.getBytes();
        int i = 0;
        int pad = 0;
        while (i < bytes.length) {
            byte b1 = bytes[i++];
            byte b2;
            byte b3;
            if (i >= bytes.length) {
                b2 = 0;
                b3 = 0;
                pad = 2;
            } else {
                b2 = bytes[i++];
                if (i >= bytes.length) {
                    b3 = 0;
                    pad = 1;
                } else
                    b3 = bytes[i++];
            }
            byte c1 = (byte) (b1 >> 2);
            byte c2 = (byte) (((b1 & 0x3) << 4) | (b2 >> 4));
            byte c3 = (byte) (((b2 & 0xf) << 2) | (b3 >> 6));
            byte c4 = (byte) (b3 & 0x3f);
            encodedString += base64Array[c1];
            encodedString += base64Array[c2];
            switch (pad) {
            case 0:
                encodedString += base64Array[c3];
                encodedString += base64Array[c4];
                break;
            case 1:
                encodedString += base64Array[c3];
                encodedString += "=";
                break;
            case 2:
                encodedString += "==";
                break;
            }
        }
        return encodedString;
    }

    private static void writeToFile(String outfilename, String data) throws Exception {
        Writer out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(outfilename), "UTF-8"));
        try {
            out.write(data);
        } finally {
            out.close();
        }
    }

    public static String loadToken() throws Exception {
        String token = "";
        File f = new File("tokens.json");
        if (f.exists()) {
            InputStream is = new FileInputStream("tokens.json");
            String jsonTxt = IOUtils.toString(is);
            JSONObject json = new JSONObject(jsonTxt);
            token = json.getString("auth");
        }
        return token;
    }
}