org.springframework.security.web.util.matcher.RegexRequestMatcher Maven / Gradle / Ivy
/*
* Copyright 2002-2016 the original author or authors.
*
* 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
*
* https://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.springframework.security.web.util.matcher;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.core.log.LogMessage;
import org.springframework.http.HttpMethod;
import org.springframework.util.StringUtils;
/**
* Uses a regular expression to decide whether a supplied the URL of a supplied
* {@code HttpServletRequest}.
*
* Can also be configured to match a specific HTTP method.
*
* The match is performed against the {@code servletPath + pathInfo + queryString} of the
* request and is case-sensitive by default. Case-insensitive matching can be used by
* using the constructor which takes the {@code caseInsensitive} argument.
*
* @author Luke Taylor
* @author Rob Winch
* @since 3.1
*/
public final class RegexRequestMatcher implements RequestMatcher {
private static final int DEFAULT = 0;
private static final Log logger = LogFactory.getLog(RegexRequestMatcher.class);
private final Pattern pattern;
private final HttpMethod httpMethod;
/**
* Creates a case-sensitive {@code Pattern} instance to match against the request.
* @param pattern the regular expression to compile into a pattern.
* @param httpMethod the HTTP method to match. May be null to match all methods.
*/
public RegexRequestMatcher(String pattern, String httpMethod) {
this(pattern, httpMethod, false);
}
/**
* As above, but allows setting of whether case-insensitive matching should be used.
* @param pattern the regular expression to compile into a pattern.
* @param httpMethod the HTTP method to match. May be null to match all methods.
* @param caseInsensitive if true, the pattern will be compiled with the
* {@link Pattern#CASE_INSENSITIVE} flag set.
*/
public RegexRequestMatcher(String pattern, String httpMethod, boolean caseInsensitive) {
this.pattern = Pattern.compile(pattern, caseInsensitive ? Pattern.CASE_INSENSITIVE : DEFAULT);
this.httpMethod = StringUtils.hasText(httpMethod) ? HttpMethod.valueOf(httpMethod) : null;
}
/**
* Performs the match of the request URL ({@code servletPath + pathInfo + queryString}
* ) against the compiled pattern. If the query string is present, a question mark
* will be prepended.
* @param request the request to match
* @return true if the pattern matches the URL, false otherwise.
*/
@Override
public boolean matches(HttpServletRequest request) {
if (this.httpMethod != null && request.getMethod() != null && this.httpMethod != valueOf(request.getMethod())) {
return false;
}
String url = request.getServletPath();
String pathInfo = request.getPathInfo();
String query = request.getQueryString();
if (pathInfo != null || query != null) {
StringBuilder sb = new StringBuilder(url);
if (pathInfo != null) {
sb.append(pathInfo);
}
if (query != null) {
sb.append('?').append(query);
}
url = sb.toString();
}
logger.debug(LogMessage.format("Checking match of request : '%s'; against '%s'", url, this.pattern));
return this.pattern.matcher(url).matches();
}
/**
* Provides a save way of obtaining the HttpMethod from a String. If the method is
* invalid, returns null.
* @param method the HTTP method to use.
* @return the HttpMethod or null if method is invalid.
*/
private static HttpMethod valueOf(String method) {
try {
return HttpMethod.valueOf(method);
}
catch (IllegalArgumentException ex) {
return null;
}
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append("Regex [pattern='").append(this.pattern).append("'");
if (this.httpMethod != null) {
sb.append(", ").append(this.httpMethod);
}
sb.append("]");
return sb.toString();
}
}