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Code Issues Releases Wiki Activity

Add support for XEP-0420: Stanza Content Encryption

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This commit is contained in:
Paul Schaub 2020-07-23 11:02:28 +02:00
parent 00acdfcb9e
commit 78f37a909e
Signed by: vanitasvitae
GPG key ID: 62BEE9264BF17311
19 changed files with 1220 additions and 0 deletions
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1
documentation/extensions/index.md
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@ -123,6 +123,7 @@ Experimental Smack Extensions and currently supported XEPs of smack-experimental
| [Consistent Color Generation](consistent_colors.md) | [XEP-0392](https://xmpp.org/extensions/xep-0392.html) | 0.6.0 | Generate consistent colors for identifiers like usernames to provide a consistent user experience. |
| [Message Markup](messagemarkup.md) | [XEP-0394](https://xmpp.org/extensions/xep-0394.html) | 0.1.0 | Style message bodies while keeping body and markup information separated. |
| DNS Queries over XMPP (DoX) | [XEP-0418](https://xmpp.org/extensions/xep-0418.html) | 0.1.0 | Send DNS queries and responses over XMPP. |
| Stanza Content Encryption | [XEP-0420](https://xmpp.org/extensions/xep-0420.html) | 0.3.0 | End-to-end encryption of arbitrary extension elements. Smack provides elements and providers to be used by encryption mechanisms. |
| Message Fastening | [XEP-0422](https://xmpp.org/extensions/xep-0422.html) | 0.1.1 | Mark payloads on a message to be logistically fastened to a previous message. |
| Message Retraction | [XEP-0424](https://xmpp.org/extensions/xep-0424.html) | 0.2.0 | Mark messages as retracted. |
| Fallback Indication | [XEP-0428](https://xmpp.org/extensions/xep-0428.html) | 0.1.0 | Declare body elements of a message as ignorable fallback for naive legacy clients. |

29
smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/AffixElement.java Normal file
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@ -0,0 +1,29 @@
/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import org.jivesoftware.smack.packet.Element;
/**
* Interface that marks elements that may be used as affix elements inside a {@link ContentElement}.
*
* @see <a href="https://xmpp.org/extensions/xep-0420.html#affix_elements">
* XEP-0420: Stanza Content Encryption - §4. Affix Elements</a>
*/
public interface AffixElement extends Element {
}

32
smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/AffixExtensionElement.java Normal file
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@ -0,0 +1,32 @@
/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import org.jivesoftware.smack.packet.ExtensionElement;
/**
* Affix element that is identified by element name and namespace.
* You should extend this interface with your custom affix extension elements
* and also provide a {@link org.jivesoftware.smackx.stanza_content_encryption.provider.AffixExtensionElementProvider}
* for them.
*
* @see <a href="https://xmpp.org/extensions/xep-0420.html#affix_elements">
* XEP-0420: Stanza Content Encryption - §4. Affix Elements</a>
*/
public interface AffixExtensionElement extends ExtensionElement, AffixElement {
}

288
smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/ContentElement.java Normal file
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@ -0,0 +1,288 @@
/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.xml.namespace.QName;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.XmlStringBuilder;
import org.jivesoftware.smackx.address.packet.MultipleAddresses;
import org.jivesoftware.smackx.hints.element.MessageProcessingHint;
import org.jivesoftware.smackx.sid.element.StanzaIdElement;
import org.jxmpp.jid.Jid;
/**
* Extension element that holds the payload element, as well as a list of affix elements.
* In SCE, the XML representation of this element is what will be encrypted using the encryption mechanism of choice.
*/
public class ContentElement implements ExtensionElement {
private static final String NAMESPACE_UNVERSIONED = "urn:xmpp:sce";
public static final String NAMESPACE_0 = NAMESPACE_UNVERSIONED + ":0";
public static final String NAMESPACE = NAMESPACE_0;
public static final String ELEMENT = "content";
public static final QName QNAME = new QName(NAMESPACE, ELEMENT);
private final PayloadElement payload;
private final List<AffixElement> affixElements;
ContentElement(PayloadElement payload, List<AffixElement> affixElements) {
this.payload = payload;
this.affixElements = Collections.unmodifiableList(affixElements);
}
/**
* Return the {@link PayloadElement} which holds the sensitive payload extensions.
*
* @return payload element
*/
public PayloadElement getPayload() {
return payload;
}
/**
* Return a list of affix elements.
* Those are elements that need to be verified upon reception by the encryption mechanisms implementation.
*
* @see <a href="https://xmpp.org/extensions/xep-0420.html#affix_elements">
* XEP-0420: Stanza Content Encryption - §4. Affix Elements</a>
*
* @return list of affix elements
*/
public List<AffixElement> getAffixElements() {
return affixElements;
}
@Override
public String getNamespace() {
return NAMESPACE;
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public XmlStringBuilder toXML(XmlEnvironment xmlEnvironment) {
XmlStringBuilder xml = new XmlStringBuilder(this).rightAngleBracket();
xml.append(affixElements);
xml.append(payload);
return xml.closeElement(this);
}
@Override
public QName getQName() {
return QNAME;
}
/**
* Return a {@link Builder} that can be used to build the {@link ContentElement}.
* @return builder
*/
public static Builder builder() {
return new Builder();
}
public static final class Builder {
private static final Set<String> BLACKLISTED_NAMESPACES = Collections.singleton(MessageProcessingHint.NAMESPACE);
private static final Set<QName> BLACKLISTED_QNAMES = Collections.unmodifiableSet(new HashSet<>(Arrays.asList(
StanzaIdElement.QNAME,
MultipleAddresses.QNAME
)));
private FromAffixElement from = null;
private TimestampAffixElement timestamp = null;
private RandomPaddingAffixElement rpad = null;
private final List<AffixElement> otherAffixElements = new ArrayList<>();
private final List<ExtensionElement> payloadItems = new ArrayList<>();
private Builder() {
}
/**
* Add an affix element of type 'to' which addresses one recipient.
* The jid in the 'to' element SHOULD be a bare jid.
*
* @param jid jid
* @return builder
*/
public Builder addTo(Jid jid) {
return addTo(new ToAffixElement(jid));
}
/**
* Add an affix element of type 'to' which addresses one recipient.
*
* @param to affix element
* @return builder
*/
public Builder addTo(ToAffixElement to) {
this.otherAffixElements.add(Objects.requireNonNull(to, "'to' affix element MUST NOT be null."));
return this;
}
/**
* Set the senders jid as a 'from' affix element.
*
* @param jid jid of the sender
* @return builder
*/
public Builder setFrom(Jid jid) {
return setFrom(new FromAffixElement(jid));
}
/**
* Set the senders jid as a 'from' affix element.
*
* @param from affix element
* @return builder
*/
public Builder setFrom(FromAffixElement from) {
this.from = Objects.requireNonNull(from, "'form' affix element MUST NOT be null.");
return this;
}
/**
* Set the given date as a 'time' affix element.
*
* @param date timestamp as date
* @return builder
*/
public Builder setTimestamp(Date date) {
return setTimestamp(new TimestampAffixElement(date));
}
/**
* Set the timestamp of the message as a 'time' affix element.
*
* @param timestamp timestamp affix element
* @return builder
*/
public Builder setTimestamp(TimestampAffixElement timestamp) {
this.timestamp = Objects.requireNonNull(timestamp, "'time' affix element MUST NOT be null.");
return this;
}
/**
* Set some random length random content padding.
*
* @return builder
*/
public Builder setRandomPadding() {
this.rpad = new RandomPaddingAffixElement();
return this;
}
/**
* Set the given string as padding.
* The padding should be of length between 1 and 200 characters.
*
* @param padding padding string
* @return builder
*/
public Builder setRandomPadding(String padding) {
return setRandomPadding(new RandomPaddingAffixElement(padding));
}
/**
* Set a padding affix element.
*
* @param padding affix element
* @return builder
*/
public Builder setRandomPadding(RandomPaddingAffixElement padding) {
this.rpad = Objects.requireNonNull(padding, "'rpad' affix element MUST NOT be empty.");
return this;
}
/**
* Add an additional, SCE profile specific affix element.
*
* @param customAffixElement additional affix element
* @return builder
*/
public Builder addFurtherAffixElement(AffixElement customAffixElement) {
this.otherAffixElements.add(Objects.requireNonNull(customAffixElement,
"Custom affix element MUST NOT be null."));
return this;
}
/**
* Add a payload item as child element of the payload element.
* There are some items that are not allowed as payload.
* Adding those will throw an exception.
*
* @see <a href="https://xmpp.org/extensions/xep-0420.html#server-processed">
* XEP-0420: Stanza Content Encryption - §9. Server-processed Elements</a>
*
* @param payloadItem extension element
* @return builder
* @throws IllegalArgumentException in case an extension element from the blacklist is added.
*/
public Builder addPayloadItem(ExtensionElement payloadItem) {
Objects.requireNonNull(payloadItem, "Payload item MUST NOT be null.");
this.payloadItems.add(checkForIllegalPayloadsAndPossiblyThrow(payloadItem));
return this;
}
/**
* Construct a content element from this builder.
*
* @return content element
*/
public ContentElement build() {
List<AffixElement> allAffixElements = collectAffixElements();
PayloadElement payloadElement = new PayloadElement(payloadItems);
return new ContentElement(payloadElement, allAffixElements);
}
private static ExtensionElement checkForIllegalPayloadsAndPossiblyThrow(ExtensionElement payloadItem) {
QName qName = payloadItem.getQName();
if (BLACKLISTED_QNAMES.contains(qName)) {
throw new IllegalArgumentException("Element identified by " + qName +
" is not allowed as payload item. See https://xmpp.org/extensions/xep-0420.html#server-processed");
}
String namespace = payloadItem.getNamespace();
if (BLACKLISTED_NAMESPACES.contains(namespace)) {
throw new IllegalArgumentException("Elements of namespace '" + namespace +
"' are not allowed as payload items. See https://xmpp.org/extensions/xep-0420.html#server-processed");
}
return payloadItem;
}
private List<AffixElement> collectAffixElements() {
List<AffixElement> allAffixElements = new ArrayList<>(Arrays.asList(rpad, from, timestamp));
allAffixElements.addAll(otherAffixElements);
return allAffixElements;
}
}
}

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/FromAffixElement.java Normal file
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@ -0,0 +1,33 @@
/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import org.jxmpp.jid.Jid;
public class FromAffixElement extends JidAffixElement {
public static final String ELEMENT = "from";
public FromAffixElement(Jid jid) {
super(jid);
}
@Override
public String getElementName() {
return ELEMENT;
}
}

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/JidAffixElement.java Normal file
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@ -0,0 +1,57 @@
/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import org.jivesoftware.smack.packet.NamedElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.util.EqualsUtil;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.XmlStringBuilder;
import org.jxmpp.jid.Jid;
public abstract class JidAffixElement implements NamedElement, AffixElement {
public static final String ATTR_JID = "jid";
private final Jid jid;
public JidAffixElement(Jid jid) {
this.jid = Objects.requireNonNull(jid, "Value of 'jid' MUST NOT be null.");
}
public Jid getJid() {
return jid;
}
@Override
public XmlStringBuilder toXML(XmlEnvironment xmlEnvironment) {
return new XmlStringBuilder(this)
.attribute(ATTR_JID, getJid())
.closeEmptyElement();
}
@Override
public final boolean equals(Object obj) {
return EqualsUtil.equals(this, obj, (e, o) -> e.append(getJid(), o.getJid()).append(getElementName(), o.getElementName()));
}
@Override
public final int hashCode() {
return (getElementName() + getJid().toString()).hashCode();
}
}

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/PayloadElement.java Normal file
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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import java.util.Collections;
import java.util.List;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.NamedElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.util.XmlStringBuilder;
public class PayloadElement implements NamedElement {
public static final String ELEMENT = "payload";
private final List<ExtensionElement> payloadElements;
public PayloadElement(List<ExtensionElement> payloadElements) {
this.payloadElements = Collections.unmodifiableList(payloadElements);
}
public List<ExtensionElement> getItems() {
return payloadElements;
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public XmlStringBuilder toXML(XmlEnvironment xmlEnvironment) {
XmlStringBuilder xml = new XmlStringBuilder(this).rightAngleBracket();
xml.append(payloadElements);
return xml.closeElement(this);
}
}

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/RandomPaddingAffixElement.java Normal file
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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import java.security.SecureRandom;
import org.jivesoftware.smack.packet.NamedElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.util.EqualsUtil;
import org.jivesoftware.smack.util.RandomUtil;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smack.util.XmlStringBuilder;
public class RandomPaddingAffixElement implements NamedElement, AffixElement {
private static final int minPaddingLength = 1;
private static final int maxPaddingLength = 200;
public static final String ELEMENT = "rpad";
private final String padding;
public RandomPaddingAffixElement(String padding) {
this.padding = StringUtils.escapeForXmlText(
StringUtils.requireNotNullNorEmpty(padding, "Value of 'rpad' MUST NOT be null nor empty."))
.toString();
}
public RandomPaddingAffixElement() {
this(StringUtils.randomString(randomPaddingLength(), new SecureRandom()));
}
private static int randomPaddingLength() {
return minPaddingLength + RandomUtil.nextSecureRandomInt(maxPaddingLength - minPaddingLength);
}
public String getPadding() {
return padding;
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public XmlStringBuilder toXML(XmlEnvironment xmlEnvironment) {
return new XmlStringBuilder(this).rightAngleBracket()
.append(getPadding())
.closeElement(this);
}
@Override
public boolean equals(Object obj) {
return EqualsUtil.equals(this, obj, (e, o) -> e.append(getPadding(), o.getPadding()));
}
@Override
public int hashCode() {
return getPadding().hashCode();
}
}

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/TimestampAffixElement.java Normal file
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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import java.util.Date;
import org.jivesoftware.smack.packet.NamedElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.util.EqualsUtil;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.XmlStringBuilder;
public class TimestampAffixElement implements NamedElement, AffixElement {
public static final String ELEMENT = "time";
public static final String ATTR_STAMP = "stamp";
private final Date timestamp;
public TimestampAffixElement(Date timestamp) {
this.timestamp = Objects.requireNonNull(timestamp, "Date must not be null.");
}
public Date getTimestamp() {
return timestamp;
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public CharSequence toXML(XmlEnvironment xmlEnvironment) {
return new XmlStringBuilder(this)
.attribute(ATTR_STAMP, getTimestamp())
.closeEmptyElement();
}
@Override
public boolean equals(Object obj) {
return EqualsUtil.equals(this, obj, (e, o) -> e.append(getTimestamp(), o.getTimestamp()));
}
@Override
public int hashCode() {
return timestamp.hashCode();
}
}

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/ToAffixElement.java Normal file
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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import org.jxmpp.jid.Jid;
public class ToAffixElement extends JidAffixElement {
public static final String ELEMENT = "to";
public ToAffixElement(Jid jid) {
super(jid);
}
@Override
public String getElementName() {
return ELEMENT;
}
}

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/element/package-info.java Normal file
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/**
*
* Copyright 2018 Paul Schaub
*
* 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.
*/
/**
* Smack's API for XEP-0420: Stanza Content Encryption: Element classes.
*/
package org.jivesoftware.smackx.stanza_content_encryption.element;

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/package-info.java Normal file
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/**
*
* Copyright 2018 Paul Schaub
*
* 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.
*/
/**
* Smack's API for XEP-0420: Stanza Content Encryption.
*
* @see <a href="https://xmpp.org/extensions/xep-0420.html">XEP-0420: Stanza Content Encryption</a>
*/
package org.jivesoftware.smackx.stanza_content_encryption;

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smack-experimental/src/main/java/org/jivesoftware/smackx/stanza_content_encryption/provider/AffixExtensionElementProvider.java Normal file
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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.provider;
import org.jivesoftware.smack.provider.ExtensionElementProvider;
import org.jivesoftware.smackx.stanza_content_encryption.element.AffixExtensionElement;
/**
* Abstract class that needs to be extended by provider classes that parse out affix extension elements.
*
* @param <AE> affix extension element.
*/
public abstract class AffixExtensionElementProvider<AE extends AffixExtensionElement> extends ExtensionElementProvider<AE> {
}

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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.provider;
import java.io.IOException;
import java.util.Date;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.parsing.SmackParsingException;
import org.jivesoftware.smack.provider.ExtensionElementProvider;
import org.jivesoftware.smack.util.PacketParserUtils;
import org.jivesoftware.smack.util.ParserUtils;
import org.jivesoftware.smack.xml.XmlPullParser;
import org.jivesoftware.smack.xml.XmlPullParserException;
import org.jivesoftware.smackx.stanza_content_encryption.element.AffixElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.ContentElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.FromAffixElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.PayloadElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.RandomPaddingAffixElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.TimestampAffixElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.ToAffixElement;
import org.jxmpp.jid.impl.JidCreate;
import org.jxmpp.stringprep.XmppStringprepException;
public class ContentElementProvider extends ExtensionElementProvider<ContentElement> {
@Override
public ContentElement parse(XmlPullParser parser, int initialDepth, XmlEnvironment xmlEnvironment)
throws XmlPullParserException, IOException, SmackParsingException {
ContentElement.Builder builder = ContentElement.builder();
while (true) {
XmlPullParser.Event tag = parser.next();
if (tag == XmlPullParser.Event.START_ELEMENT) {
String name = parser.getName();
switch (name) {
case ToAffixElement.ELEMENT:
parseToAffix(parser, builder);
break;
case FromAffixElement.ELEMENT:
parseFromAffix(parser, builder);
break;
case TimestampAffixElement.ELEMENT:
parseTimestampAffix(parser, builder);
break;
case RandomPaddingAffixElement.ELEMENT:
parseRPadAffix(parser, builder);
break;
case PayloadElement.ELEMENT:
parsePayload(parser, xmlEnvironment, builder);
break;
default:
parseCustomAffix(parser, xmlEnvironment, builder);
break;
}
} else if (tag == XmlPullParser.Event.END_ELEMENT) {
if (parser.getDepth() == initialDepth) {
break;
}
}
}
return builder.build();
}
private static void parseCustomAffix(XmlPullParser parser, XmlEnvironment outerXmlEnvironment, ContentElement.Builder builder)
throws XmlPullParserException, IOException, SmackParsingException {
String name = parser.getName();
String namespace = parser.getNamespace();
AffixElement element = (AffixElement) PacketParserUtils.parseExtensionElement(name, namespace, parser, outerXmlEnvironment);
builder.addFurtherAffixElement(element);
}
private static void parsePayload(XmlPullParser parser, XmlEnvironment outerXmlEnvironment, ContentElement.Builder builder)
throws IOException, XmlPullParserException, SmackParsingException {
final int initialDepth = parser.getDepth();
while (true) {
XmlPullParser.Event tag = parser.next();
if (tag == XmlPullParser.Event.START_ELEMENT) {
String name = parser.getName();
String namespace = parser.getNamespace();
ExtensionElement element = PacketParserUtils.parseExtensionElement(name, namespace, parser, outerXmlEnvironment);
builder.addPayloadItem(element);
}
if (tag == XmlPullParser.Event.END_ELEMENT && parser.getDepth() == initialDepth) {
return;
}
}
}
private static void parseRPadAffix(XmlPullParser parser, ContentElement.Builder builder)
throws IOException, XmlPullParserException {
builder.setRandomPadding(parser.nextText());
}
private static void parseTimestampAffix(XmlPullParser parser, ContentElement.Builder builder)
throws SmackParsingException.SmackTextParseException {
Date timestamp = ParserUtils.getDateFromXep82String(
parser.getAttributeValue("", TimestampAffixElement.ATTR_STAMP));
builder.setTimestamp(timestamp);
}
private static void parseFromAffix(XmlPullParser parser, ContentElement.Builder builder)
throws XmppStringprepException {
String jidString = parser.getAttributeValue("", FromAffixElement.ATTR_JID);
builder.setFrom(JidCreate.from(jidString));
}
private static void parseToAffix(XmlPullParser parser, ContentElement.Builder builder)
throws XmppStringprepException {
String jidString = parser.getAttributeValue("", ToAffixElement.ATTR_JID);
builder.addTo(JidCreate.from(jidString));
}
}

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/**
*
* Copyright 2018 Paul Schaub
*
* 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.
*/
/**
* Smack's API for XEP-0420: Stanza Content Encryption: Provider classes.
*/
package org.jivesoftware.smackx.stanza_content_encryption.provider;

7
smack-experimental/src/main/resources/org.jivesoftware.smack.experimental/experimental.providers
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@ -292,6 +292,13 @@
<className>org.jivesoftware.smackx.dox.provider.DnsIqProvider</className>
</iqProvider>
<!-- XEP-0420: Stanza Content Encryption (SCE) -->
<extensionProvider>
<elementName>content</elementName>
<namespace>urn:xmpp:sce:0</namespace>
<className>org.jivesoftware.smackx.stanza_content_encryption.provider.ContentElementProvider</className>
</extensionProvider>
<!-- XEP-0422: Message Fastening -->
<extensionProvider>
<elementName>apply-to</elementName>

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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import static org.jivesoftware.smack.test.util.XmlAssertUtil.assertXmlSimilar;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertFalse;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.text.ParseException;
import java.util.Date;
import org.junit.jupiter.api.Test;
import org.jxmpp.jid.EntityBareJid;
import org.jxmpp.jid.impl.JidCreate;
import org.jxmpp.util.XmppDateTime;
public class AffixElementsTest {
public static final EntityBareJid JID_HOUSTON = JidCreate.entityBareFromOrThrowUnchecked("missioncontrol@houston.nasa.gov");
public static final EntityBareJid JID_OPPORTUNITY = JidCreate.entityBareFromOrThrowUnchecked("opportunity@mars.planet");
/**
* Test serialization of 'to' affix element.
*
* @see <a href="https://xmpp.org/extensions/xep-0420.html#example-1">XEP-420 Example 1</a>
*/
@Test
public void testToAffixElement() {
ToAffixElement to = new ToAffixElement(JID_HOUSTON);
String expectedXml = "<to jid='missioncontrol@houston.nasa.gov'/>";
assertXmlSimilar(expectedXml, to.toXML());
assertEquals(JID_HOUSTON, to.getJid());
}
@Test
public void testToAffixElementEquals() {
ToAffixElement to1 = new ToAffixElement(JID_HOUSTON);
ToAffixElement to2 = new ToAffixElement(JID_HOUSTON);
assertEquals(to1, to2);
assertEquals(to1, to1);
assertEquals(to1.hashCode(), to2.hashCode());
assertFalse(to1.equals(null));
}
@Test
public void toElementNullArgThrows() {
assertThrows(IllegalArgumentException.class, () -> new ToAffixElement(null));
}
/**
* Test serialization of 'from' affix element.
*
* @see <a href="https://xmpp.org/extensions/xep-0420.html#example-1">XEP-420 Example 1</a>
*/
@Test
public void testFromAffixElement() {
FromAffixElement from = new FromAffixElement(JID_OPPORTUNITY);
String expectedXml = "<from jid='opportunity@mars.planet'/>";
assertXmlSimilar(expectedXml, from.toXML());
assertEquals(JID_OPPORTUNITY, from.getJid());
}
@Test
public void testFromAffixElementEquals() {
FromAffixElement from1 = new FromAffixElement(JID_HOUSTON);
FromAffixElement from2 = new FromAffixElement(JID_HOUSTON);
assertEquals(from1, from2);
assertEquals(from1, from1);
assertEquals(from1.hashCode(), from2.hashCode());
assertFalse(from1.equals(null));
}
@Test
public void fromElementNullArgThrows() {
assertThrows(IllegalArgumentException.class, () -> new FromAffixElement(null));
}
@Test
public void testTimestampAffixElement() throws ParseException {
Date date = XmppDateTime.parseDate("2004-01-25T05:05:00.000+00:00");
TimestampAffixElement timestamp = new TimestampAffixElement(date);
String expectedXml = "<time stamp='2004-01-25T05:05:00.000+00:00'/>";
assertXmlSimilar(expectedXml, timestamp.toXML());
assertEquals(date, timestamp.getTimestamp());
}
@Test
public void timestampElementNullArgThrows() {
assertThrows(IllegalArgumentException.class, () -> new TimestampAffixElement(null));
}
@Test
public void testTimestampElementEquals() throws ParseException {
TimestampAffixElement t1 = new TimestampAffixElement(XmppDateTime.parseDate("2004-01-25T05:05:00.000+00:00"));
TimestampAffixElement t2 = new TimestampAffixElement(t1.getTimestamp());
assertEquals(t1, t2);
assertEquals(t1, t1);
assertEquals(t1.hashCode(), t2.hashCode());
assertFalse(t1.equals(null));
}
@Test
public void testRandomPaddingElement() {
RandomPaddingAffixElement rpad = new RandomPaddingAffixElement();
assertNotNull(rpad.getPadding());
assertTrue(rpad.getPadding().length() < 200);
}
@Test
public void testRandomPaddingEquals() {
RandomPaddingAffixElement rpad1 = new RandomPaddingAffixElement();
RandomPaddingAffixElement rpad2 = new RandomPaddingAffixElement(rpad1.getPadding());
assertEquals(rpad1, rpad2);
assertEquals(rpad1, rpad1);
assertEquals(rpad1.hashCode(), rpad2.hashCode());
assertFalse(rpad1.equals(null));
}
@Test
public void testRandomPaddingSerialization() {
RandomPaddingAffixElement rpad = new RandomPaddingAffixElement();
String expectedXml = "<rpad>" + rpad.getPadding() + "</rpad>";
assertXmlSimilar(expectedXml, rpad.toXML());
}
@Test
public void rpadElementNullArgThrows() {
assertThrows(IllegalArgumentException.class, () -> new RandomPaddingAffixElement(null));
}
}

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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.element;
import static org.jivesoftware.smack.test.util.XmlAssertUtil.assertXmlSimilar;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertThrows;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.text.ParseException;
import java.util.Collections;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smackx.hints.element.StoreHint;
import org.jivesoftware.smackx.sid.element.StanzaIdElement;
import org.junit.jupiter.api.Test;
import org.jxmpp.util.XmppDateTime;
public class ContentElementTest {
@Test
public void testContentElement() throws ParseException {
Message.Body body = new Message.Body("en", "My battery is low and it’s getting dark"); // :'(
ContentElement contentElement = ContentElement.builder()
.addPayloadItem(body)
.setFrom(AffixElementsTest.JID_OPPORTUNITY)
.addTo(AffixElementsTest.JID_HOUSTON)
.setTimestamp(XmppDateTime.parseXEP0082Date("2018-06-10T00:00:00.000+00:00"))
.setRandomPadding("RANDOMPADDING")
.build();
String expectedXml = "" +
"<content xmlns='urn:xmpp:sce:0'>" +
" <to jid='missioncontrol@houston.nasa.gov'/>" +
" <from jid='opportunity@mars.planet'/>" +
" <time stamp='2018-06-10T00:00:00.000+00:00'/>" +
" <rpad>RANDOMPADDING</rpad>" +
" <payload>" +
" <body xmlns='jabber:client' xml:lang='en'>My battery is low and it’s getting dark</body>" +
" </payload>" +
"</content>";
assertXmlSimilar(expectedXml, contentElement.toXML());
assertEquals(Collections.singletonList(body), contentElement.getPayload().getItems());
assertEquals(4, contentElement.getAffixElements().size());
assertTrue(contentElement.getAffixElements().contains(new ToAffixElement(AffixElementsTest.JID_HOUSTON)));
assertTrue(contentElement.getAffixElements().contains(new FromAffixElement(AffixElementsTest.JID_OPPORTUNITY)));
assertTrue(contentElement.getAffixElements().contains(
new TimestampAffixElement(XmppDateTime.parseXEP0082Date("2018-06-10T00:00:00.000+00:00"))));
assertTrue(contentElement.getAffixElements().contains(new RandomPaddingAffixElement("RANDOMPADDING")));
}
@Test
public void stanzaIdForbiddenInContentElementPayload() {
assertThrows(IllegalArgumentException.class,
() -> ContentElement.builder().addPayloadItem(new StanzaIdElement("alice@wonderland.lit")));
}
@Test
public void processingHintsForbiddenInContentElementPayload() {
assertThrows(IllegalArgumentException.class,
() -> ContentElement.builder().addPayloadItem(StoreHint.INSTANCE));
}
}

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/**
*
* Copyright 2020 Paul Schaub
*
* 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 org.jivesoftware.smackx.stanza_content_encryption.provider;
import static org.junit.jupiter.api.Assertions.assertEquals;
import static org.junit.jupiter.api.Assertions.assertNotNull;
import static org.junit.jupiter.api.Assertions.assertTrue;
import java.io.IOException;
import org.jivesoftware.smack.packet.Message;
import org.jivesoftware.smack.packet.StandardExtensionElement;
import org.jivesoftware.smack.parsing.SmackParsingException;
import org.jivesoftware.smack.test.util.TestUtils;
import org.jivesoftware.smack.util.ParserUtils;
import org.jivesoftware.smack.xml.XmlPullParserException;
import org.jivesoftware.smackx.stanza_content_encryption.element.ContentElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.FromAffixElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.RandomPaddingAffixElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.TimestampAffixElement;
import org.jivesoftware.smackx.stanza_content_encryption.element.ToAffixElement;
import org.junit.jupiter.api.Test;
import org.jxmpp.jid.impl.JidCreate;
public class ContentElementProviderTest {
@Test
public void testParsing() throws XmlPullParserException, IOException, SmackParsingException {
String xml = "" +
"<content xmlns='urn:xmpp:sce:0'>\n" +
" <payload>\n" +
" <body xmlns='jabber:client'>Have you seen that new movie?</body>\n" +
" <x xmlns='jabber:x:oob'>\n" +
" <url>https://en.wikipedia.org/wiki/Fight_Club#Plot</url>\n" +
" </x>\n" +
" </payload>\n" +
" <from jid='ladymacbeth@shakespear.lit/castle'/>\n" +
" <to jid='doctor@shakespeare.lit/pda'/>\n" +
" <time stamp='1993-10-12T03:13:10.000+00:00'/>\n" +
" <rpad>A98D7KJF1ASDVG232sdff341</rpad>\n" +
"</content>";
ContentElementProvider provider = new ContentElementProvider();
ContentElement contentElement = provider.parse(TestUtils.getParser(xml));
assertNotNull(contentElement);
assertEquals(4, contentElement.getAffixElements().size());
assertTrue(contentElement.getAffixElements().contains(
new FromAffixElement(JidCreate.from("ladymacbeth@shakespear.lit/castle"))));
assertTrue(contentElement.getAffixElements().contains(
new ToAffixElement(JidCreate.from("doctor@shakespeare.lit/pda"))));
assertTrue(contentElement.getAffixElements().contains(
new TimestampAffixElement(ParserUtils.getDateFromXep82String("1993-10-12T03:13:10.000+00:00"))));
assertTrue(contentElement.getAffixElements().contains(
new RandomPaddingAffixElement("A98D7KJF1ASDVG232sdff341")));
assertEquals(2, contentElement.getPayload().getItems().size());
assertTrue(contentElement.getPayload().getItems().get(0) instanceof Message.Body);
Message.Body body = (Message.Body) contentElement.getPayload().getItems().get(0);
assertEquals("Have you seen that new movie?", body.getMessage());
StandardExtensionElement oob = (StandardExtensionElement) contentElement.getPayload().getItems().get(1);
assertEquals("x", oob.getElementName());
assertEquals("jabber:x:oob", oob.getNamespace());
assertEquals("https://en.wikipedia.org/wiki/Fight_Club#Plot", oob.getFirstElement("url").getText());
}
}