com.hotels.styx.server.routing.AntlrMatcher Maven / Gradle / Ivy
/**
* Copyright (C) 2013-2017 Expedia Inc.
*
* 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 com.hotels.styx.server.routing;
import com.hotels.styx.api.HttpCookie;
import com.hotels.styx.api.HttpRequest;
import com.hotels.styx.server.routing.antlr.AntlrConditionParser;
import static com.hotels.styx.api.HttpHeaderNames.USER_AGENT;
/**
* A Route matcher based on ANTLR condition parser.
*/
public final class AntlrMatcher implements Matcher {
static final Condition.Parser CONDITION_PARSER = new AntlrConditionParser.Builder()
.registerFunction("method", request -> request.method().name())
.registerFunction("path", HttpRequest::path)
.registerFunction("userAgent", request -> request.header(USER_AGENT).orElse(""))
.registerFunction("protocol", request -> request.isSecure() ? "https" : "http")
.registerFunction("header", (request, input) -> request.header(input).orElse(""))
.registerFunction("cookie", (request, input) -> request.cookie(input).map(HttpCookie::value).orElse(""))
.build();
private final Condition condition;
public static AntlrMatcher antlrMatcher(String conditionString) {
Condition condition = CONDITION_PARSER.parse(conditionString);
return new AntlrMatcher(condition);
}
private AntlrMatcher(Condition condition) {
this.condition = condition;
}
@Override
public boolean apply(HttpRequest request) {
return this.condition.evaluate(request);
}
}