ValidateElement.java
/**
*
* Copyright 2014 Anno van Vliet, 2019-2020 Florian Schmaus
*
* 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.xdatavalidation.packet;
import java.math.BigInteger;
import javax.xml.namespace.QName;
import org.jivesoftware.smack.datatypes.UInt32;
import org.jivesoftware.smack.packet.XmlElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smack.util.XmlStringBuilder;
import org.jivesoftware.smackx.xdata.AbstractSingleStringValueFormField;
import org.jivesoftware.smackx.xdata.FormField;
import org.jivesoftware.smackx.xdata.FormFieldChildElement;
import org.jivesoftware.smackx.xdata.packet.DataForm;
import org.jivesoftware.smackx.xdatavalidation.ValidationConsistencyException;
/**
* DataValidation Extension according to XEP-0122: Data Forms Validation. This specification defines a
* backwards-compatible extension to the XMPP Data Forms protocol that enables applications to specify additional
* validation guidelines related to a {@link FormField} in a {@link DataForm}, such as validation of standard XML
* datatypes, application-specific datatypes, value ranges, and regular expressions.
*
* @author Anno van Vliet
*/
public abstract class ValidateElement implements FormFieldChildElement {
public static final String DATATYPE_XS_STRING = "xs:string";
public static final String ELEMENT = "validate";
public static final String NAMESPACE = "http://jabber.org/protocol/xdata-validate";
public static final QName QNAME = new QName(NAMESPACE, ELEMENT);
private final String datatype;
private ListRange listRange;
/**
* The 'datatype' attribute specifies the datatype. This attribute is OPTIONAL, and when not specified, defaults to
* "xs:string".
*
* @param datatype the data type of any value contained within the {@link FormField} element.
*/
private ValidateElement(String datatype) {
this.datatype = StringUtils.isNotEmpty(datatype) ? datatype : null;
}
/**
* Specifies the data type of any value contained within the {@link FormField} element. It MUST meet one of the
* following conditions:
* <ul>
* <li>Start with "xs:", and be one of the "built-in" datatypes defined in XML Schema Part 2 <a
* href="http://www.xmpp.org/extensions/xep-0122.html#nt-idp1476016">[2]</a></li>
* <li>Start with a prefix registered with the XMPP Registrar <a
* href="http://www.xmpp.org/extensions/xep-0122.html#nt-idp1478544">[3]</a></li>
* <li>Start with "x:", and specify a user-defined datatype <a
* href="http://www.xmpp.org/extensions/xep-0122.html#nt-idp1477360">[4]</a></li>
* </ul>
*
* @return the datatype
*/
public String getDatatype() {
return datatype != null ? datatype : DATATYPE_XS_STRING;
}
@Override
public String getElementName() {
return ELEMENT;
}
@Override
public String getNamespace() {
return NAMESPACE;
}
@Override
public QName getQName() {
return QNAME;
}
@Override
public final boolean mustBeOnlyOfHisKind() {
return true;
}
@Override
public XmlStringBuilder toXML(org.jivesoftware.smack.packet.XmlEnvironment enclosingNamespace) {
XmlStringBuilder buf = new XmlStringBuilder(this, enclosingNamespace);
buf.optAttribute("datatype", datatype);
buf.rightAngleBracket();
appendXML(buf);
buf.optAppend(getListRange());
buf.closeElement(this);
return buf;
}
/**
* Append XML.
*
* @param buf TODO javadoc me please
*/
protected abstract void appendXML(XmlStringBuilder buf);
/**
* Set list range.
* @param listRange the listRange to set
*/
public void setListRange(ListRange listRange) {
this.listRange = listRange;
}
/**
* Get list range.
* @return the listRange
*/
public ListRange getListRange() {
return listRange;
}
/**
* Check if this element is consistent according to the business rules in XEP-0122.
*
* @param formFieldBuilder the builder used to construct the form field.
*/
@Override
public abstract void checkConsistency(FormField.Builder<?, ?> formFieldBuilder);
public static ValidateElement from(FormField formField) {
return (ValidateElement) formField.getFormFieldChildElement(QNAME);
}
/**
* Validation only against the datatype itself. Indicates that the value(s) should simply match the field type and
* datatype constraints.
*
* @see ValidateElement
*/
public static class BasicValidateElement extends ValidateElement {
public static final String METHOD = "basic";
/**
* Basic validate element constructor.
* @param datatype TODO javadoc me please
* @see #getDatatype()
*/
public BasicValidateElement(String datatype) {
super(datatype);
}
@Override
protected void appendXML(XmlStringBuilder buf) {
buf.emptyElement(METHOD);
}
@Override
public void checkConsistency(FormField.Builder<?, ?> formField) {
checkListRangeConsistency(formField);
if (formField.getType() != null) {
switch (formField.getType()) {
case hidden:
case jid_multi:
case jid_single:
throw new ValidationConsistencyException(String.format(
"Field type '%1$s' is not consistent with validation method '%2$s'.",
formField.getType(), BasicValidateElement.METHOD));
default:
break;
}
}
}
}
/**
* For "list-single" or "list-multi", indicates that the user may enter a custom value (matching the datatype
* constraints) or choose from the predefined values.
*
* @see ValidateElement
*/
public static class OpenValidateElement extends ValidateElement {
public static final String METHOD = "open";
/**
* Open validate element constructor.
* @param datatype TODO javadoc me please
* @see #getDatatype()
*/
public OpenValidateElement(String datatype) {
super(datatype);
}
@Override
protected void appendXML(XmlStringBuilder buf) {
buf.emptyElement(METHOD);
}
@Override
public void checkConsistency(FormField.Builder<?, ?> formField) {
checkListRangeConsistency(formField);
if (formField.getType() != null) {
switch (formField.getType()) {
case hidden:
throw new ValidationConsistencyException(String.format(
"Field type '%1$s' is not consistent with validation method '%2$s'.",
formField.getType(), OpenValidateElement.METHOD));
default:
break;
}
}
}
}
/**
* Indicate that the value should fall within a certain range.
*
* @see ValidateElement
*/
public static class RangeValidateElement extends ValidateElement {
public static final String METHOD = "range";
private final String min;
private final String max;
/**
* Range validate element constructor.
* @param datatype TODO javadoc me please
* @param min the minimum allowable value. This attribute is OPTIONAL. The value depends on the datatype in use.
* @param max the maximum allowable value. This attribute is OPTIONAL. The value depends on the datatype in use.
* @see #getDatatype()
*
*/
public RangeValidateElement(String datatype, String min, String max) {
super(datatype);
this.min = min;
this.max = max;
}
@Override
protected void appendXML(XmlStringBuilder buf) {
buf.halfOpenElement(METHOD);
buf.optAttribute("min", getMin());
buf.optAttribute("max", getMax());
buf.closeEmptyElement();
}
/**
* The 'min' attribute specifies the minimum allowable value.
*
* @return the minimum allowable value. This attribute is OPTIONAL. The value depends on the datatype in use.
*/
public String getMin() {
return min;
}
/**
* The 'max' attribute specifies the maximum allowable value.
*
* @return the maximum allowable value. This attribute is OPTIONAL. The value depends on the datatype in use.
*/
public String getMax() {
return max;
}
@Override
public void checkConsistency(FormField.Builder<?, ?> formField) {
checkNonMultiConsistency(formField, METHOD);
if (getDatatype().equals(ValidateElement.DATATYPE_XS_STRING)) {
throw new ValidationConsistencyException(String.format(
"Field data type '%1$s' is not consistent with validation method '%2$s'.",
getDatatype(), RangeValidateElement.METHOD));
}
}
@Override
public void validate(FormField formField) {
AbstractSingleStringValueFormField singleValueFormField = formField.ifPossibleAs(AbstractSingleStringValueFormField.class);
if (singleValueFormField == null) {
// We currently only implement validation for single value fields.
return;
}
String valueString = singleValueFormField.getValue();
switch (getDatatype()) {
case "xs:int":
case "xs:integer":
BigInteger value = new BigInteger(valueString);
String minString = getMin();
if (minString != null) {
BigInteger min = new BigInteger(minString);
if (value.compareTo(min) < 0) {
throw new IllegalArgumentException("The provided value " + valueString + " is lower than the allowed minimum of " + minString);
}
}
String maxString = getMax();
if (maxString != null) {
BigInteger max = new BigInteger(maxString);
if (value.compareTo(max) > 0) {
throw new IllegalArgumentException("The provided value " + valueString + " is higher than the allowed maximum of " + maxString);
}
}
break;
}
}
}
/**
* Indicates that the value should be restricted to a regular expression. The regular expression must be that
* defined for <a href="http://www.xmpp.org/extensions/xep-0122.html#nt-idp1501344"> POSIX extended regular
* expressions </a> including support for <a
* href="http://www.xmpp.org/extensions/xep-0122.html#nt-idp1502496">Unicode</a>.
*
* @see ValidateElement
*/
public static class RegexValidateElement extends ValidateElement {
public static final String METHOD = "regex";
private final String regex;
/**
* Regex validate element.
* @param datatype TODO javadoc me please
* @param regex TODO javadoc me please
* @see #getDatatype()
*/
public RegexValidateElement(String datatype, String regex) {
super(datatype);
this.regex = regex;
}
/**
* the expression is that defined for POSIX extended regular expressions, including support for Unicode.
*
* @return the regex
*/
public String getRegex() {
return regex;
}
@Override
protected void appendXML(XmlStringBuilder buf) {
buf.element("regex", getRegex());
}
@Override
public void checkConsistency(FormField.Builder<?, ?> formField) {
checkNonMultiConsistency(formField, METHOD);
}
}
/**
* This element indicates for "list-multi", that a minimum and maximum number of options should be selected and/or
* entered.
*/
public static class ListRange implements XmlElement {
public static final String ELEMENT = "list-range";
private final UInt32 min;
private final UInt32 max;
public ListRange(Long min, Long max) {
this(min != null ? UInt32.from(min) : null, max != null ? UInt32.from(max) : null);
}
/**
* The 'max' attribute specifies the maximum allowable number of selected/entered values. The 'min' attribute
* specifies the minimum allowable number of selected/entered values. Both attributes are optional, but at
* least one must bet set, and the value must be within the range of a unsigned 32-bit integer.
*
* @param min TODO javadoc me please
* @param max TODO javadoc me please
*/
public ListRange(UInt32 min, UInt32 max) {
if (max == null && min == null) {
throw new IllegalArgumentException("Either min or max must be given");
}
this.min = min;
this.max = max;
}
@Override
public XmlStringBuilder toXML(XmlEnvironment enclosingXmlEnvironment) {
XmlStringBuilder buf = new XmlStringBuilder(this, enclosingXmlEnvironment);
buf.optAttributeCs("min", getMin());
buf.optAttributeCs("max", getMax());
buf.closeEmptyElement();
return buf;
}
@Override
public String getElementName() {
return ELEMENT;
}
/**
* The minimum allowable number of selected/entered values.
*
* @return a positive integer, can be null
*/
public UInt32 getMin() {
return min;
}
/**
* The maximum allowable number of selected/entered values.
*
* @return a positive integer, can be null
*/
public UInt32 getMax() {
return max;
}
@Override
public String getNamespace() {
return NAMESPACE;
}
}
/**
* The >list-range/< element SHOULD be included only when the <field/> is of type "list-multi" and SHOULD be ignored
* otherwise.
*
* @param formField TODO javadoc me please
*/
protected void checkListRangeConsistency(FormField.Builder<?, ?> formField) {
ListRange listRange = getListRange();
if (listRange == null) {
return;
}
Object max = listRange.getMax();
Object min = listRange.getMin();
if ((max != null || min != null) && formField.getType() != FormField.Type.list_multi) {
throw new ValidationConsistencyException(
"Field type is not of type 'list-multi' while a 'list-range' is defined.");
}
}
/**
* Check that the field being build is not of type multi (or hidden).
*
* @param formField TODO javadoc me please
* @param method TODO javadoc me please
*/
protected void checkNonMultiConsistency(FormField.Builder<?, ?> formField, String method) {
checkListRangeConsistency(formField);
if (formField.getType() != null) {
switch (formField.getType()) {
case hidden:
case jid_multi:
case list_multi:
case text_multi:
throw new ValidationConsistencyException(String.format(
"Field type '%1$s' is not consistent with validation method '%2$s'.",
formField.getType(), method));
default:
break;
}
}
}
}