147 lines
4.2 KiB
Java
147 lines
4.2 KiB
Java
/**
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*
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* Copyright 2017 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.eme.element;
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import java.util.HashMap;
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import java.util.Map;
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import org.jivesoftware.smack.packet.ExtensionElement;
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import org.jivesoftware.smack.packet.Message;
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import org.jivesoftware.smack.util.StringUtils;
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import org.jivesoftware.smack.util.XmlStringBuilder;
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public class ExplicitMessageEncryptionElement implements ExtensionElement {
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private static final Map<String, ExplicitMessageEncryptionProtocol> PROTOCOL_LUT = new HashMap<>();
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public static final String ELEMENT = "encryption";
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public static final String NAMESPACE = "urn:xmpp:eme:0";
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public enum ExplicitMessageEncryptionProtocol {
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/**
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* The encryption method specified in <a href="https://xmpp.org/extensions/xep-0373.html">XEP-0373: OpenPGP for
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* XMPP</a>.
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*/
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openpgpV0("urn:xmpp:openpgp:0", "OpenPGP for XMPP (XEP-0373)"),
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otrV0("urn:xmpp:otr:0", "Off-the-Record Messaging (XEP-0364)"),
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legacyOpenPGP("jabber:x:encrypted", "Legacy OpenPGP for XMPP [DANGEROUS, DO NOT USE!]"),
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;
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private final String namespace;
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private final String name;
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ExplicitMessageEncryptionProtocol(String namespace, String name) {
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this.namespace = namespace;
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this.name = name;
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PROTOCOL_LUT.put(namespace, this);
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}
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public String getNamespace() {
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return namespace;
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}
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public String getName() {
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return name;
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}
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public static ExplicitMessageEncryptionProtocol from(String namespace) {
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return PROTOCOL_LUT.get(namespace);
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}
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}
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private final String encryptionNamespace;
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private final String name;
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private boolean isUnknownProtocol;
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private ExplicitMessageEncryptionProtocol protocolCache;
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public ExplicitMessageEncryptionElement(ExplicitMessageEncryptionProtocol protocol) {
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this(protocol.getNamespace(), protocol.getName());
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}
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public ExplicitMessageEncryptionElement(String encryptionNamespace) {
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this(encryptionNamespace, null);
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}
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public ExplicitMessageEncryptionElement(String encryptionNamespace, String name) {
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this.encryptionNamespace = StringUtils.requireNotNullOrEmpty(encryptionNamespace,
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"encryptionNamespace must not be null");
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this.name = name;
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}
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public ExplicitMessageEncryptionProtocol getProtocol() {
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if (protocolCache != null) {
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return protocolCache;
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}
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if (isUnknownProtocol) {
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return null;
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}
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ExplicitMessageEncryptionProtocol protocol = PROTOCOL_LUT.get(encryptionNamespace);
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if (protocol == null) {
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isUnknownProtocol = true;
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return null;
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}
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protocolCache = protocol;
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return protocol;
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}
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public String getEncryptionNamespace() {
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return encryptionNamespace;
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}
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/**
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* Get the optional name of the encryption method.
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*
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* @return the name of the encryption method or <code>null</code>.
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*/
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public String getName() {
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return name;
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}
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@Override
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public String getElementName() {
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return ELEMENT;
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}
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@Override
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public String getNamespace() {
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return NAMESPACE;
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}
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@Override
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public XmlStringBuilder toXML() {
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XmlStringBuilder xml = new XmlStringBuilder(this);
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xml.attribute("namespace", getEncryptionNamespace());
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xml.optAttribute("name", getName());
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xml.closeEmptyElement();
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return xml;
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}
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public static ExplicitMessageEncryptionElement from(Message message) {
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return message.getExtension(ELEMENT, NAMESPACE);
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}
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}
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