/**
* Copyright (C) 2015 Orange
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.francetelecom.clara.cloud.commons;
import com.google.common.base.Ascii;
import com.google.common.base.CharMatcher;
import com.google.common.net.InternetDomainName;
import org.apache.commons.lang3.StringUtils;
/**
*
*/
public class FqdnHelper {
public static final CharMatcher FILTERED_CHARS_IN_NAMES = CharMatcher.anyOf(".-" +
"\u3002\uFF0E\uFF61"); //additional unicode characters synomym for .
/**
* Takes a candidate fqdn and removes all invalid parts. if this becomes empty, it returns the default.
* When too long, trims by removing chars at beginning
* @param candidateFqdn
* @param defaultOnEmpty a valid default domain name, otherwise an exception is thrown.
* @return
*/
public static String truncateUnsupportedCharsToValidHost(String candidateFqdn, String defaultOnEmpty) {
if (defaultOnEmpty== null || defaultOnEmpty.isEmpty() || !InternetDomainName.isValid(defaultOnEmpty)) {
throw new IllegalArgumentException("invalid default (" +defaultOnEmpty + ")");
}
String trimmed;
if (candidateFqdn == null || candidateFqdn.isEmpty()) {
return defaultOnEmpty;
}
trimmed = InternetDomainNameCleaner.from(candidateFqdn).name();
if (trimmed.isEmpty()) {
return defaultOnEmpty;
}
return trimmed;
}
/**
* Sanitize a subpart of the uri so that it does not contain separators we use in domains.
* e.g. when trying to construct "c-{conflictid}-{webGuiLabel}-{envLabel}-{appRelease}{appVersion}-{paasInstance}.{cfSubDomain]"
* this method can be called on each individual part such as "webGuiLabel" so that they don't use
* dots or dashes and get truncated to the appropriate length by trimming extra chars at beginning.
* @param uriPart a part of the fqdn (e.g. "webguilabel")
*/
public static String sanitizeAndTruncatePart(String uriPart, int maxLength) {
String sanitizedString = FILTERED_CHARS_IN_NAMES.removeFrom(uriPart);
sanitizedString = Ascii.toLowerCase(sanitizedString);
sanitizedString = InternetDomainNameCleaner.getFixedPart(sanitizedString, false);
if (sanitizedString.length() > maxLength) {
sanitizedString = StringUtils.left(sanitizedString, maxLength);
}
sanitizedString = InternetDomainNameCleaner.getFixedPart(sanitizedString, false);
return sanitizedString;
}
}