/*
* JBoss, Home of Professional Open Source.
* Copyright 2014 Red Hat, Inc., and individual contributors
* as indicated by the @author tags.
*
* 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 io.undertow.predicate;
import java.util.
HashMap;
import java.util.
HashSet;
import java.util.
Map;
import java.util.
Set;
import java.util.
TreeMap;
import java.util.regex.
Matcher;
import java.util.regex.
Pattern;
import io.undertow.attribute.
ExchangeAttribute;
import io.undertow.attribute.
ExchangeAttributes;
import io.undertow.server.
HttpServerExchange;
/**
* A predicate that does a regex match against an exchange.
* <p>
* <p>
* By default this match is done against the relative URI, however it is possible to set it to match against other
* exchange attributes.
*
* @author Stuart Douglas
*/
public class
RegularExpressionPredicate implements
Predicate {
private final
Pattern pattern;
private final
ExchangeAttribute matchAttribute;
private final boolean
requireFullMatch;
public
RegularExpressionPredicate(final
String regex, final
ExchangeAttribute matchAttribute, final boolean
requireFullMatch, boolean
caseSensitive) {
this.
requireFullMatch =
requireFullMatch;
pattern =
Pattern.
compile(
regex,
caseSensitive ? 0 :
Pattern.
CASE_INSENSITIVE);
this.
matchAttribute =
matchAttribute;
}
public
RegularExpressionPredicate(final
String regex, final
ExchangeAttribute matchAttribute, final boolean
requireFullMatch) {
this(
regex,
matchAttribute,
requireFullMatch, true);
}
public
RegularExpressionPredicate(final
String regex, final
ExchangeAttribute matchAttribute) {
this(
regex,
matchAttribute, false);
}
@
Override
public boolean
resolve(final
HttpServerExchange value) {
String input =
matchAttribute.
readAttribute(
value);
if(
input == null) {
return false;
}
Matcher matcher =
pattern.
matcher(
input);
final boolean
matches;
if (
requireFullMatch) {
matches =
matcher.
matches();
} else {
matches =
matcher.
find();
}
if (
matches) {
Map<
String,
Object>
context =
value.
getAttachment(
PREDICATE_CONTEXT);
if(
context == null) {
value.
putAttachment(
PREDICATE_CONTEXT,
context = new
TreeMap<>());
}
int
count =
matcher.
groupCount();
for (int
i = 0;
i <=
count; ++
i) {
context.
put(
Integer.
toString(
i),
matcher.
group(
i));
}
}
return
matches;
}
public static class
Builder implements
PredicateBuilder {
@
Override
public
String name() {
return "regex";
}
@
Override
public
Map<
String,
Class<?>>
parameters() {
final
Map<
String,
Class<?>>
params = new
HashMap<>();
params.
put("pattern",
String.class);
params.
put("value",
ExchangeAttribute.class);
params.
put("full-match",
Boolean.class);
params.
put("case-sensitive",
Boolean.class);
return
params;
}
@
Override
public
Set<
String>
requiredParameters() {
final
Set<
String>
params = new
HashSet<>();
params.
add("pattern");
return
params;
}
@
Override
public
String defaultParameter() {
return "pattern";
}
@
Override
public
Predicate build(final
Map<
String,
Object>
config) {
ExchangeAttribute value = (
ExchangeAttribute)
config.
get("value");
if(
value == null) {
value =
ExchangeAttributes.
relativePath();
}
Boolean fullMatch = (
Boolean)
config.
get("full-match");
Boolean caseSensitive = (
Boolean)
config.
get("case-sensitive");
String pattern = (
String)
config.
get("pattern");
return new
RegularExpressionPredicate(
pattern,
value,
fullMatch == null ? false :
fullMatch,
caseSensitive == null ? true :
caseSensitive);
}
}
}