get Client Id From Certificate - Android java.security

Android examples for java.security:Decrypt Encrypt

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Description

get Client Id From Certificate

Demo Code

/*// w w w. j  a v a2 s.c  o  m
 * ?? ?Copyright 2015 IBM Corp.
 * ?? ?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.java2s;

import java.security.cert.X509Certificate;

import java.util.regex.Pattern;

public class Main {
    public static String getClientIdFromCertificate(
            X509Certificate certificate) {

        if (certificate == null) {
            throw new IllegalArgumentException("Certificate cannot be null");
        }

        //subjectDN is of the form: "UID=<clientId>, DC=<some other value>" or "DC=<some other value>, UID=<clientId>"
        String clientId = null;

        String subjectDN = certificate.getSubjectDN().getName();
        String[] parts = subjectDN.split(Pattern.quote(","));
        for (String part : parts) {
            if (part.contains("UID=")) {
                String uid = part.substring(part.indexOf("UID="));
                clientId = uid.split(Pattern.quote("="))[1];
            }
        }

        return clientId;
    }
}

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