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// Copyright (C) 2014 The Android Open Source Project
//
// 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.google.gerrit.util.http;
import com.google.common.base.Splitter;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
/** Utilities for manipulating HTTP request objects. */
public class RequestUtil {
private static final Splitter SPLITTER = Splitter.on("/");
/** HTTP request attribute for storing the Throwable that caused an error condition. */
private static final String ATTRIBUTE_ERROR_TRACE =
RequestUtil.class.getName() + "/ErrorTraceThrowable";
public static void setErrorTraceAttribute(HttpServletRequest req, Throwable t) {
req.setAttribute(ATTRIBUTE_ERROR_TRACE, t);
}
public static Throwable getErrorTraceAttribute(HttpServletRequest req) {
return (Throwable) req.getAttribute(ATTRIBUTE_ERROR_TRACE);
}
/**
* Returns the same value as {@link HttpServletRequest#getPathInfo()}, but without decoding
* URL-encoded characters.
*/
public static String getEncodedPathInfo(HttpServletRequest req) {
// CS IGNORE LineLength FOR NEXT 3 LINES. REASON: URL.
// Based on com.google.guice.ServletDefinition$1#getPathInfo() from:
// https://github.com/google/guice/blob/41c126f99d6309886a0ded2ac729033d755e1593/extensions/servlet/src/com/google/inject/servlet/ServletDefinition.java
String servletPath = req.getServletPath();
int servletPathLength = servletPath.length();
String requestUri = req.getRequestURI();
String pathInfo =
requestUri.substring(req.getContextPath().length()).replaceAll("[/]{2,}", "/");
if (pathInfo.startsWith(servletPath)) {
pathInfo = pathInfo.substring(servletPathLength);
// Corner case: when servlet path & request path match exactly (without
// trailing '/'), then pathinfo is null.
if (pathInfo.isEmpty() && servletPathLength > 0) {
pathInfo = null;
}
} else {
pathInfo = null;
}
return pathInfo;
}
/**
* Trims leading '/' and 'a/'. Removes the context path, but keeps the servlet path. Removes all
* IDs from the rest of the URI.
*
* <p>The returned string is a good fit for cases where one wants the full context of the request
* without any identifiable data. For example: Logging or quota checks.
*
* <p>Examples:
*
* <ul>
* <li>/a/accounts/self/detail => /accounts/detail
* <li>/changes/123/revisions/current/detail => /changes/revisions/detail
* <li>/changes/ => /changes
* </ul>
*/
public static String getRestPathWithoutIds(HttpServletRequest req) {
String encodedPathInfo = req.getRequestURI().substring(req.getContextPath().length());
if (encodedPathInfo.startsWith("/")) {
encodedPathInfo = encodedPathInfo.substring(1);
}
if (encodedPathInfo.startsWith("a/")) {
encodedPathInfo = encodedPathInfo.substring(2);
}
List<String> parts = SPLITTER.splitToList(encodedPathInfo);
StringBuilder result = new StringBuilder(parts.size());
for (int i = 0; i < parts.size(); i = i + 2) {
result.append("/");
result.append(parts.get(i));
}
return result.toString();
}
public static boolean acceptsGzipEncoding(HttpServletRequest request) {
String accepts = request.getHeader("Accept-Encoding");
return accepts != null && accepts.indexOf("gzip") != -1;
}
private RequestUtil() {}
}
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