130 lines
3.6 KiB
Java
130 lines
3.6 KiB
Java
/**
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*
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* Copyright © 2017 Paul Schaub, 2021 Florian Schmaus
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package org.jivesoftware.smackx.hashes.element;
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import static org.jivesoftware.smack.util.Objects.requireNonNull;
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import javax.xml.namespace.QName;
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import org.jivesoftware.smack.packet.ExtensionElement;
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import org.jivesoftware.smack.util.XmlStringBuilder;
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import org.jivesoftware.smack.util.stringencoder.Base64;
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import org.jivesoftware.smackx.hashes.HashManager;
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/**
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* Represent a hash element.
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*
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* @author Paul Schaub
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*/
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public class HashElement implements ExtensionElement {
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public static final String ELEMENT = "hash";
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public static final String ATTR_ALGO = "algo";
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public static final QName QNAME = new QName(HashManager.NAMESPACE.V2.toString(), ELEMENT);
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private final HashManager.ALGORITHM algorithm;
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private final byte[] hash;
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private final String hashB64;
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/**
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* Create a HashElement from pre-calculated values.
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* @param algorithm The algorithm which was used.
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* @param hash the checksum as byte array.
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*/
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public HashElement(HashManager.ALGORITHM algorithm, byte[] hash) {
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this.algorithm = requireNonNull(algorithm);
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this.hash = requireNonNull(hash);
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hashB64 = Base64.encodeToString(hash);
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}
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/**
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* Create a HashElement from pre-calculated values.
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* @param algorithm the algorithm that was used.
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* @param hashB64 the checksum in base 64.
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*/
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public HashElement(HashManager.ALGORITHM algorithm, String hashB64) {
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this.algorithm = algorithm;
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this.hash = Base64.decode(hashB64);
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this.hashB64 = hashB64;
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}
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/**
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* Return the hash algorithm used in this HashElement.
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*
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* @return algorithm the algorithm.
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*/
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public HashManager.ALGORITHM getAlgorithm() {
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return algorithm;
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}
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/**
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* Return the checksum as a byte array.
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*
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* @return the hash.
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*/
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public byte[] getHash() {
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return hash;
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}
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/**
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* Return the checksum as a base16 (hex) string.
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*
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* @return the hash.
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*/
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public String getHashB64() {
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return hashB64;
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}
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@Override
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public String getElementName() {
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return QNAME.getLocalPart();
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}
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@Override
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public String getNamespace() {
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return QNAME.getNamespaceURI();
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}
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@Override
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public CharSequence toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
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XmlStringBuilder sb = new XmlStringBuilder(this);
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sb.attribute(ATTR_ALGO, algorithm.toString());
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sb.rightAngleBracket();
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sb.append(hashB64);
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sb.closeElement(this);
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return sb;
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}
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@Override
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public boolean equals(Object other) {
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if (other == null || !(other instanceof HashElement)) {
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return false;
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}
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HashElement otherHashElement = (HashElement) other;
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return this.getAlgorithm() == otherHashElement.getAlgorithm() &&
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this.getHashB64().equals(otherHashElement.getHashB64());
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}
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@Override
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public int hashCode() {
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return toXML().toString().hashCode();
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}
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}
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