/*******************************************************************************
 * ============LICENSE_START====================================================
 * * org.onap.aaf
 * * ===========================================================================
 * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * * ===========================================================================
 * * 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.
 * * ============LICENSE_END====================================================
 * *
 * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 * *
 ******************************************************************************/
package com.att.cadi.principal;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Date;

import com.att.cadi.BasicCred;
import com.att.cadi.GetCred;
import com.att.cadi.Symm;

public class BasicPrincipal extends BearerPrincipal implements GetCred {
	private static byte[] basic = "Basic ".getBytes();

	private String name = null;
	private String shortName = null;
	private byte[] cred = null;
	
	private long created;

	public BasicPrincipal(String content,String domain) throws IOException {
		created = System.currentTimeMillis();
		ByteArrayInputStream bis = new ByteArrayInputStream(content.getBytes());
		// Read past "Basic ", ensuring it starts with it.
		for(int i=0;i<basic.length;++i) {
			if(bis.read()!=basic[i]) {
				name=content;
				cred = null;
				return;
			}
		}
		BasicOS bos = new BasicOS(content.length());
		Symm.base64.decode(bis,bos); // note: writes directly to name until ':'
		if(name==null) throw new IOException("Invalid Coding");
		else cred = bos.toCred();
		int at;
		if((at=name.indexOf('@'))>0) {
			domain=name.substring(at+1);
			shortName=name.substring(0, at);
		} else {
			shortName = name;
			name = name + '@' + domain;
		}
	}
	
	public BasicPrincipal(BasicCred bc, String domain) {
		name = bc.getUser();
		cred = bc.getCred();
	}

	private class BasicOS extends OutputStream {
		private boolean first = true;
		private ByteArrayOutputStream baos;
		
		public BasicOS(int size) {
			baos = new ByteArrayOutputStream(size);
		}

		@Override
		public void write(int b) throws IOException {
			if(b==':' && first) {
				first = false;
				name = new String(baos.toByteArray());
				baos.reset(); // 
			} else {
				baos.write(b);
			}
		}
		
		private byte[] toCred() {
			return baos.toByteArray();
		}
	}
	
	public String getName() {
		return name;
	}
	
	public String getShortName() {
		return shortName;
	}
	
	public byte[] getCred() {
		return cred;
	}
	
	public long created() {
		return created;
	}

	public String toString() {
		return "Basic Authorization for " + name + " evaluated on " + new Date(created).toString();
	}
}