org.obm.push.utils.UserEmailParserUtils.java Source code

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Here is the source code for org.obm.push.utils.UserEmailParserUtils.java

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/* ***** BEGIN LICENSE BLOCK *****
 * 
 * Copyright (C) 2011-2014  Linagora
 *
 * This program is free software: you can redistribute it and/or 
 * modify it under the terms of the GNU Affero General Public License as 
 * published by the Free Software Foundation, either version 3 of the 
 * License, or (at your option) any later version, provided you comply 
 * with the Additional Terms applicable for OBM connector by Linagora 
 * pursuant to Section 7 of the GNU Affero General Public License, 
 * subsections (b), (c), and (e), pursuant to which you must notably (i) retain 
 * the Message sent thanks to OBM, Free Communication by Linagora? 
 * signature notice appended to any and all outbound messages 
 * (notably e-mail and meeting requests), (ii) retain all hypertext links between 
 * OBM and obm.org, as well as between Linagora and linagora.com, and (iii) refrain 
 * from infringing Linagora intellectual property rights over its trademarks 
 * and commercial brands. Other Additional Terms apply, 
 * see <http://www.linagora.com/licenses/> for more details. 
 *
 * This program is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License 
 * for more details. 
 *
 * You should have received a copy of the GNU Affero General Public License 
 * and its applicable Additional Terms for OBM along with this program. If not, 
 * see <http://www.gnu.org/licenses/> for the GNU Affero General Public License version 3 
 * and <http://www.linagora.com/licenses/> for the Additional Terms applicable to 
 * OBM connectors. 
 * 
 * ***** END LICENSE BLOCK ***** */
package org.obm.push.utils;

import java.util.Iterator;

import com.google.common.base.Splitter;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Iterables;
import com.google.inject.Singleton;

@Singleton
public class UserEmailParserUtils {

    private static final int LOGIN = 0;
    private static final int DOMAIN = 1;

    public String getLogin(String userId) {
        String[] loginAndDomain = getLoginAndDomain(userId);
        return loginAndDomain[LOGIN];
    }

    public String getDomain(String userId) {
        String[] loginAndDomain = getLoginAndDomain(userId);
        return loginAndDomain[DOMAIN];
    }

    public boolean isAddress(String email) {
        try {
            String[] loginAndDomain = getLoginAndDomain(email);
            return !Strings.isNullOrEmpty(loginAndDomain[LOGIN]) && !Strings.isNullOrEmpty(loginAndDomain[DOMAIN]);
        } catch (Exception e) {
            return false;
        }
    }

    private String[] getLoginAndDomain(String userId) {
        Iterable<String> parts = splitOnSlashes(userId);
        String[] loginAndDomain = buildUserFromLoginParts(parts);
        if (loginAndDomain == null) {
            parts = splitOnAtSign(userId);
            loginAndDomain = buildUserFromLoginParts(parts);
        }
        if (loginAndDomain == null) {
            throw new IllegalArgumentException();
        }
        return loginAndDomain;
    }

    private Iterable<String> splitOnSlashes(String userId) {
        Iterable<String> parts = Splitter.on("\\").omitEmptyStrings().split(userId);
        return parts;
    }

    private Iterable<String> splitOnAtSign(String userId) {
        Iterable<String> parts = Splitter.on("@").split(trimBeginSlash(userId));
        return ImmutableList.copyOf(parts).reverse();
    }

    private CharSequence trimBeginSlash(String userId) {
        if (userId.startsWith("\\")) {
            return userId.substring(1);
        } else {
            return userId;
        }
    }

    private String[] buildUserFromLoginParts(Iterable<String> parts) {
        int nbParts = Iterables.size(parts);
        if (nbParts > 2) {
            throw new IllegalArgumentException();
        } else if (nbParts == 2) {
            Iterator<String> iterator = parts.iterator();
            String domain = iterator.next();
            String login = iterator.next();
            checkField("domain", domain);
            checkField("login", login);
            return new String[] { login, domain };
        }
        return null;
    }

    private void checkField(String key, String field) {
        if (field.contains("@") || field.contains("\\")) {
            throw new IllegalArgumentException(key + " is invalid : " + field);
        }
    }

}