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Contains reusable platform independant code for all SwiftSMS client applications.
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package org.swiftsms.io.net;

import java.net.CookieHandler;
import java.net.CookieManager;
import java.net.HttpCookie;
import java.net.URI;
import java.util.ArrayList;
import java.util.List;

import org.swiftsms.model.Account;
import org.swiftsms.tasks.results.Fail;
import org.swiftsms.tasks.results.OperationResult;
import org.swiftsms.tasks.results.Success;
import org.swiftsms.utils.HTMLParser;

public class O2 extends Operator {

	private static final String MESSAGING_BASE_URL = "http://messaging.three.ie";

	private static final String HTTP_REFERER = "Referer";
	private static final String HTTP_COOKIE = "Cookie";
	private static final String GET = "GET";

	private static final String LOGIN_PRE_URL = "https://www.three.ie/web/my-3/";
	private static final String PRE_REQUEST_ID = "request_id\" value=\"";
	private static final String POST_REQUEST_ID = "\">";

	private static final String LOGIN_URL = "https://www.three.ie/oam/server/auth_cred_submit";
	private static final String LOGIN_POST_USER = "username";
	private static final String LOGIN_POST_PASS = "password";
	private static final String LOGIN_POST_REQUEST_ID = "request_id";
	private static final String LOGIN_SUCCESS = "my-3-dashboard-user";
	private static final String SESSION_SID_PRE = "var GLOBAL_SESSION_ID = '";
	private static final String SESSION_SID_POST = "';";

	private static final String COOKIE_O2_DOMAIN = "http://www.three.ie";
	private static final String COOKIE_EQUALS = "=";
	private static final String COOKIE_SEMI_COLON = "; ";

	private static final String SESSION_URL = MESSAGING_BASE_URL + "/ssomanager.osp?APIID=AUTH-WEBSSO&TargetApp=o2om_smscenter_new.osp%3FMsgContentID%3D-1%26SID%3D_";
	private static final String SMS_BASE_URL = MESSAGING_BASE_URL + "/o2om_smscenter_new.osp?MsgContentID=-1&SID=_&SID=";
	private static final String SMS_PRE = "spn_WebtextFree\">";
	private static final String SMS_POST = "";

	private static final String SEND_URL = MESSAGING_BASE_URL + "/smscenter_send.osp";
	private static final String SEND_POST_SID = "SID";
	private static final String SEND_POST_TO = "SMSTo";
	private static final String SEND_POST_TEXT = "SMSText";
	private static final String SEND_SUCCESS = "isSuccess : true";

	private String remainingSMS;
	private String sessionId;

	public O2(final Account account) {
		super(account);
	}

	@Override
	OperationResult doLogin() {
		final ConnectionManager preMgr = new ConnectionManager(LOGIN_PRE_URL, GET, false);
		String html = preMgr.connect();

		if (!html.contains(LOGIN_SUCCESS)) {
			final String requestId = HTMLParser.parseHtml(html, PRE_REQUEST_ID, POST_REQUEST_ID);

			final ConnectionManager manager = new ConnectionManager(LOGIN_URL);
			manager.addPostHeader(LOGIN_POST_USER, this.getAccount().getMobileNumber());
			manager.addPostHeader(LOGIN_POST_PASS, this.getAccount().getPassword());
			manager.addPostHeader(LOGIN_POST_REQUEST_ID, requestId);
			html = manager.connect();
		}
		this.prepareWebtextSession();

		final boolean isSuccess = html.contains(LOGIN_SUCCESS);
		return isSuccess ? Success.LOGGED_IN : Fail.LOGIN_FAILED;
	}

	private void prepareWebtextSession() {
		ConnectionManager manager = new ConnectionManager(SESSION_URL, GET, false);
		String html = manager.connect();
		this.sessionId = HTMLParser.parseHtml(html, SESSION_SID_PRE, SESSION_SID_POST);

		manager = new ConnectionManager(SMS_BASE_URL + this.sessionId, GET, false);
		manager.setRequestHeader(HTTP_COOKIE, this.getCookieHeader());
		html = manager.connect();
		this.remainingSMS = HTMLParser.parseHtml(html, SMS_PRE, SMS_POST);
	}

	private String getCookieHeader() {
		final URI oUri = URI.create(COOKIE_O2_DOMAIN);
		final URI mUri = URI.create(MESSAGING_BASE_URL);
		final StringBuilder cookieHeader = new StringBuilder();
		final CookieManager cookieMgr = (CookieManager) CookieHandler.getDefault();

		final List cookies = new ArrayList<>(cookieMgr.getCookieStore().get(oUri));
		cookies.addAll(cookieMgr.getCookieStore().get(mUri));
		for (int i = 0; i < cookies.size(); i++) {
			if (i != 0) {
				cookieHeader.append(COOKIE_SEMI_COLON);
			}
			final HttpCookie cookie = cookies.get(i);
			cookieHeader.append(cookie.getName());
			cookieHeader.append(COOKIE_EQUALS);
			cookieHeader.append(cookie.getValue());
		}
		return cookieHeader.toString();
	}

	@Override
	int doGetRemainingSMS() {
		return this.remainingSMS == null ? -1 : Integer.parseInt(this.remainingSMS);
	}

	@Override
	OperationResult doSend(final List recipients, final String message) {
		final ConnectionManager manager = this.buildSendManager(recipients, message);
		final String rawJson = manager.connect();

		final boolean isSent = rawJson.contains(SEND_SUCCESS);
		return isSent ? Success.MESSAGE_SENT : Fail.MESSAGE_FAILED;
	}

	private ConnectionManager buildSendManager(final List recipients, final String message) {
		final StringBuilder sb = new StringBuilder();
		for (final String recipient : recipients) {
			sb.append(recipient);
			sb.append(",");
		}
		sb.deleteCharAt(sb.length() - 1); // remove trailing comma

		final ConnectionManager manager = new ConnectionManager(SEND_URL);
		manager.setRequestHeader(HTTP_COOKIE, this.getCookieHeader());
		manager.setRequestHeader(HTTP_REFERER, SMS_BASE_URL + this.sessionId);
		manager.addPostHeader(SEND_POST_SID, this.sessionId);
		manager.addPostHeader(SEND_POST_TO, sb.toString());
		manager.addPostHeader(SEND_POST_TEXT, message);
		return manager;
	}

	@Override
	int doGetCharacterLimit() {
		return 160;
	}
}