root / src / gr / ebs / gss / server / rest / RequestHandler.java @ f24cdf08
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/*
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* Copyright 2008, 2009 Electronic Business Systems Ltd.
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*
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* This file is part of GSS.
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*
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* GSS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GSS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GSS. If not, see <http://www.gnu.org/licenses/>.
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*/
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package gr.ebs.gss.server.rest; |
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import static gr.ebs.gss.server.configuration.GSSConfigurationFactory.getConfiguration; |
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import gr.ebs.gss.client.exceptions.InsufficientPermissionsException; |
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import gr.ebs.gss.client.exceptions.ObjectNotFoundException; |
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import gr.ebs.gss.client.exceptions.RpcException; |
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import gr.ebs.gss.server.domain.User; |
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import gr.ebs.gss.server.domain.dto.FileHeaderDTO; |
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import gr.ebs.gss.server.webdav.Webdav; |
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import java.io.ByteArrayInputStream; |
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import java.io.ByteArrayOutputStream; |
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import java.io.IOException; |
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import java.io.OutputStreamWriter; |
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import java.io.PrintWriter; |
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import java.io.UnsupportedEncodingException; |
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import java.util.Calendar; |
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import java.util.Enumeration; |
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import java.util.HashMap; |
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import java.util.Map; |
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import javax.crypto.Mac; |
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import javax.crypto.spec.SecretKeySpec; |
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import javax.servlet.ServletException; |
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import javax.servlet.http.HttpServletRequest; |
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import javax.servlet.http.HttpServletResponse; |
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import org.apache.commons.codec.binary.Base64; |
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import org.apache.commons.logging.Log; |
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import org.apache.commons.logging.LogFactory; |
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/**
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* The servlet that handles requests for the REST API.
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*
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* @author past
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*/
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public class RequestHandler extends Webdav { |
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/**
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* The request attribute containing the flag that will be used to indicate an
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* authentication bypass has occurred. We will have to check for authentication
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* later. This is a shortcut for dealing with publicly-readable files.
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*/
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protected static final String AUTH_DEFERRED_ATTR = "authDeferred"; |
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/**
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* The path for the search subsystem.
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*/
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protected static final String PATH_SEARCH = "/search"; |
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/**
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* The path for the user search subsystem.
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*/
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protected static final String PATH_USERS = "/users"; |
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/**
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* The path for the resource manipulation subsystem.
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*/
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protected static final String PATH_FILES = FileHeaderDTO.PATH_FILES; |
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/**
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* The path for the trash virtual folder.
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*/
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protected static final String PATH_TRASH = "/trash"; |
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/**
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* The path for the subsystem that deals with the user attributes.
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*/
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protected static final String PATH_GROUPS = "/groups"; |
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/**
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* The path for the shared resources virtual folder.
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*/
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protected static final String PATH_SHARED = "/shared"; |
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/**
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* The path for the other users' shared resources virtual folder.
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*/
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protected static final String PATH_OTHERS = "/others"; |
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/**
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* The path for tags created by the user.
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*/
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protected static final String PATH_TAGS = "/tags"; |
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/**
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* The GSS-specific header for the request timestamp.
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*/
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private static final String GSS_DATE_HEADER = "X-GSS-Date"; |
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/**
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* The RFC 2616 date header.
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*/
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private static final String DATE_HEADER = "Date"; |
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/**
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* The Authorization HTTP header.
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*/
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private static final String AUTHORIZATION_HEADER = "Authorization"; |
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/**
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* The group parameter name.
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*/
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protected static final String GROUP_PARAMETER = "name"; |
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/**
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* The username parameter name.
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*/
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protected static final String USERNAME_PARAMETER = "name"; |
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/**
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* The "new folder name" parameter name.
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*/
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protected static final String NEW_FOLDER_PARAMETER = "new"; |
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/**
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* The resource update parameter name.
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*/
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protected static final String RESOURCE_UPDATE_PARAMETER = "update"; |
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/**
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* The resource trash parameter name.
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*/
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protected static final String RESOURCE_TRASH_PARAMETER = "trash"; |
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/**
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* The resource restore parameter name.
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*/
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protected static final String RESOURCE_RESTORE_PARAMETER = "restore"; |
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/**
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* The resource copy parameter name.
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*/
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protected static final String RESOURCE_COPY_PARAMETER = "copy"; |
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/**
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* The resource move parameter name.
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*/
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protected static final String RESOURCE_MOVE_PARAMETER = "move"; |
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/**
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* The HMAC-SHA1 hash name.
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*/
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private static final String HMAC_SHA1 = "HmacSHA1"; |
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/**
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* The serial version UID of the class.
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*/
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private static final long serialVersionUID = 1L; |
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/**
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* The logger.
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*/
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private static Log logger = LogFactory.getLog(RequestHandler.class); |
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/**
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* Create a mapping between paths and allowed HTTP methods for fast lookup.
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*/
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private final Map<String, String> methodsAllowed = new HashMap<String, String>(7); |
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@Override
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public void init() throws ServletException { |
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super.init();
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methodsAllowed.put(PATH_FILES, METHOD_GET + ", " + METHOD_POST +
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", " + METHOD_DELETE + ", " + METHOD_PUT + ", " + METHOD_HEAD); |
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methodsAllowed.put(PATH_GROUPS, METHOD_GET + ", " + METHOD_POST +
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", " + METHOD_DELETE);
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methodsAllowed.put(PATH_OTHERS, METHOD_GET); |
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methodsAllowed.put(PATH_SEARCH, METHOD_GET); |
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methodsAllowed.put(PATH_USERS, METHOD_GET); |
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methodsAllowed.put(PATH_SHARED, METHOD_GET); |
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methodsAllowed.put(PATH_TAGS, METHOD_GET); |
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methodsAllowed.put(PATH_TRASH, METHOD_GET + ", " + METHOD_DELETE);
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} |
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/**
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* Return the root of every API request URL.
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*/
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protected String getApiRoot() { |
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return getConfiguration().getString("restUrl", "http://localhost:8080/gss/rest/"); |
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} |
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@Override
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public void service(final HttpServletRequest request, final HttpServletResponse response) throws IOException, ServletException { |
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String method = request.getMethod();
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String path = getRelativePath(request);
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if (logger.isDebugEnabled())
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logger.debug("[" + method + "] " + path); |
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if (!isRequestValid(request)) {
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if (!method.equals(METHOD_GET) && !method.equals(METHOD_HEAD) &&
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!method.equals(METHOD_POST)) {
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response.sendError(HttpServletResponse.SC_FORBIDDEN); |
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return;
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} |
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// Raise a flag to indicate we will have to check for
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// authentication later. This is a shortcut for dealing
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// with publicly-readable files.
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request.setAttribute(AUTH_DEFERRED_ATTR, true);
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} |
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// Dispatch to the appropriate method handler.
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if (method.equals(METHOD_GET))
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doGet(request, response); |
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else if (method.equals(METHOD_POST)) |
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doPost(request, response); |
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else if (method.equals(METHOD_PUT)) |
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doPut(request, response); |
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else if (method.equals(METHOD_DELETE)) |
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doDelete(request, response); |
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else if (method.equals(METHOD_HEAD)) |
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doHead(request, response); |
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else
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response.sendError(HttpServletResponse.SC_BAD_REQUEST); |
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} |
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@Override
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protected void doHead(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException { |
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boolean authDeferred = getAuthDeferred(req);
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// Strip the username part
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String path;
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try {
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path = getUserPath(req); |
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} catch (ObjectNotFoundException e) {
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if (authDeferred) {
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// We do not want to leak information if the request
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// was not authenticated.
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resp.sendError(HttpServletResponse.SC_FORBIDDEN); |
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return;
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} |
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage()); |
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return;
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} |
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if (authDeferred && !path.startsWith(PATH_FILES)) {
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// Only files may be open to the public.
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resp.sendError(HttpServletResponse.SC_FORBIDDEN); |
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return;
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} |
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if (path.startsWith(PATH_GROUPS)) {
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resp.addHeader("Allow", methodsAllowed.get(PATH_GROUPS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_OTHERS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_OTHERS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_SEARCH)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_SEARCH));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_USERS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_USERS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_SHARED)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_SHARED));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_TAGS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_TAGS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_TRASH)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_TRASH));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_FILES)) |
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// Serve the requested resource, without the data content
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new FilesHandler(getServletContext()).serveResource(req, resp, false); |
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else
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, req.getRequestURI()); |
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} |
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/**
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* Handle storing and updating file resources.
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*
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* @param req The servlet request we are processing
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* @param resp The servlet response we are creating
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* @throws IOException if the response cannot be sent
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*/
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@Override
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protected void doPut(HttpServletRequest req, HttpServletResponse resp) throws IOException { |
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// TODO: fix code duplication between doPut() and Webdav.doPut()
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// Strip the username part
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String path;
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try {
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path = getUserPath(req); |
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} catch (ObjectNotFoundException e) {
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage()); |
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return;
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} |
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if (path.startsWith(PATH_GROUPS)) {
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resp.addHeader("Allow", methodsAllowed.get(PATH_GROUPS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_OTHERS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_OTHERS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_SEARCH)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_SEARCH));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_USERS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_USERS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_SHARED)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_SHARED));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_TAGS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_TAGS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_TRASH)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_TRASH));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_FILES)) |
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new FilesHandler(getServletContext()).putResource(req, resp);
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else
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, req.getRequestURI()); |
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} |
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@Override
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protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException { |
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boolean authDeferred = getAuthDeferred(req);
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// Strip the username part
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String path;
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try {
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path = getUserPath(req); |
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} catch (ObjectNotFoundException e) {
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if (authDeferred) {
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// We do not want to leak information if the request
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// was not authenticated.
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resp.sendError(HttpServletResponse.SC_FORBIDDEN); |
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return;
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} |
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage()); |
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return;
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} |
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if (authDeferred && !path.startsWith(PATH_FILES)) {
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// Only files may be open to the public.
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resp.sendError(HttpServletResponse.SC_FORBIDDEN); |
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return;
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} |
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// Dispatch according to the specified namespace
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if (path.equals("") || path.equals("/")) |
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new UserHandler().serveUser(req, resp);
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else if (path.startsWith(PATH_FILES)) |
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// Serve the requested resource, including the data content
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new FilesHandler(getServletContext()).serveResource(req, resp, true); |
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else if (path.startsWith(PATH_TRASH)) |
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new TrashHandler().serveTrash(req, resp);
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else if (path.startsWith(PATH_SEARCH)) |
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new SearchHandler().serveSearchResults(req, resp);
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else if (path.startsWith(PATH_USERS)) |
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new UserSearchHandler().serveResults(req, resp);
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else if (path.startsWith(PATH_GROUPS)) |
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new GroupsHandler().serveGroups(req, resp);
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else if (path.startsWith(PATH_SHARED)) |
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new SharedHandler().serveShared(req, resp);
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else if (path.startsWith(PATH_OTHERS)) |
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new OthersHandler().serveOthers(req, resp);
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else if (path.startsWith(PATH_TAGS)) |
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new TagsHandler().serveTags(req, resp);
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else
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, req.getRequestURI()); |
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} |
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/**
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* Handle a Delete request.
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*
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* @param req The servlet request we are processing
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* @param resp The servlet response we are processing
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* @throws IOException if the response cannot be sent
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*/
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@Override
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protected void doDelete(HttpServletRequest req, HttpServletResponse resp) |
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throws IOException { |
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// Strip the username part
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String path;
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try {
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path = getUserPath(req); |
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} catch (ObjectNotFoundException e) {
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage()); |
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return;
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} |
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if (path.startsWith(PATH_OTHERS)) {
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resp.addHeader("Allow", methodsAllowed.get(PATH_OTHERS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_SEARCH)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_SEARCH));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_USERS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_USERS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_SHARED)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_SHARED));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_TAGS)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_TAGS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_GROUPS)) |
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new GroupsHandler().deleteGroup(req, resp);
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else if (path.startsWith(PATH_TRASH)) |
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new TrashHandler().emptyTrash(req, resp);
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else if (path.startsWith(PATH_FILES)) |
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new FilesHandler(getServletContext()).deleteResource(req, resp);
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else
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, req.getRequestURI()); |
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} |
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|
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@Override
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protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws IOException { |
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boolean authDeferred = getAuthDeferred(req);
|
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// Strip the username part
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String path;
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try {
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path = getUserPath(req); |
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} catch (ObjectNotFoundException e) {
|
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if (authDeferred) {
|
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// We do not want to leak information if the request
|
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// was not authenticated.
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resp.sendError(HttpServletResponse.SC_FORBIDDEN); |
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return;
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} |
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resp.sendError(HttpServletResponse.SC_NOT_FOUND, e.getMessage()); |
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return;
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} |
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if (authDeferred && !path.startsWith(PATH_FILES)) {
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// Only POST to files may be authenticated without an Authorization header.
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resp.sendError(HttpServletResponse.SC_FORBIDDEN); |
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return;
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} |
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if (path.startsWith(PATH_OTHERS)) {
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resp.addHeader("Allow", methodsAllowed.get(PATH_OTHERS));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
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} else if (path.startsWith(PATH_SEARCH)) { |
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resp.addHeader("Allow", methodsAllowed.get(PATH_SEARCH));
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resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
| 452 |
} else if (path.startsWith(PATH_USERS)) { |
| 453 |
resp.addHeader("Allow", methodsAllowed.get(PATH_USERS));
|
| 454 |
resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
| 455 |
} else if (path.startsWith(PATH_SHARED)) { |
| 456 |
resp.addHeader("Allow", methodsAllowed.get(PATH_SHARED));
|
| 457 |
resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
| 458 |
} else if (path.startsWith(PATH_TAGS)) { |
| 459 |
resp.addHeader("Allow", methodsAllowed.get(PATH_TAGS));
|
| 460 |
resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
| 461 |
} else if (path.startsWith(PATH_GROUPS)) |
| 462 |
new GroupsHandler().postGroup(req, resp);
|
| 463 |
else if (path.startsWith(PATH_TRASH)) { |
| 464 |
resp.addHeader("Allow", methodsAllowed.get(PATH_TRASH));
|
| 465 |
resp.sendError(HttpServletResponse.SC_METHOD_NOT_ALLOWED); |
| 466 |
} else if (path.startsWith(PATH_FILES)) |
| 467 |
new FilesHandler(getServletContext()).postResource(req, resp);
|
| 468 |
else if (path.equals("/")) |
| 469 |
new UserHandler().postUser(req, resp);
|
| 470 |
else
|
| 471 |
resp.sendError(HttpServletResponse.SC_NOT_FOUND, req.getRequestURI()); |
| 472 |
} |
| 473 |
|
| 474 |
/**
|
| 475 |
* Return the path inside the user namespace.
|
| 476 |
*
|
| 477 |
* @param req the HTTP request
|
| 478 |
* @return the path after the username part has been removed
|
| 479 |
* @throws ObjectNotFoundException if the namespace owner was not found
|
| 480 |
*/
|
| 481 |
private String getUserPath(HttpServletRequest req) throws ObjectNotFoundException { |
| 482 |
String path = getRelativePath(req);
|
| 483 |
if (path.length() < 2) |
| 484 |
return path;
|
| 485 |
int slash = path.substring(1).indexOf('/'); |
| 486 |
if (slash == -1) |
| 487 |
return path;
|
| 488 |
String owner = path.substring(1, slash + 1); |
| 489 |
User o; |
| 490 |
try {
|
| 491 |
o = getService().findUser(owner); |
| 492 |
} catch (RpcException e) {
|
| 493 |
logger.error("", e);
|
| 494 |
throw new ObjectNotFoundException("User " + owner + " not found, due to internal server error"); |
| 495 |
} |
| 496 |
if (o != null) { |
| 497 |
req.setAttribute(OWNER_ATTRIBUTE, o); |
| 498 |
return path.substring(slash + 1); |
| 499 |
} |
| 500 |
if (!path.startsWith(PATH_SEARCH) && !path.startsWith(PATH_USERS))
|
| 501 |
throw new ObjectNotFoundException("User " + owner + " not found"); |
| 502 |
return path;
|
| 503 |
} |
| 504 |
|
| 505 |
/**
|
| 506 |
* Retrieve the request context path with or without a trailing slash
|
| 507 |
* according to the provided argument.
|
| 508 |
*
|
| 509 |
* @param req the HTTP request
|
| 510 |
* @param withTrailingSlash a flag that denotes whether the path should
|
| 511 |
* end with a slash
|
| 512 |
* @return the context path
|
| 513 |
*/
|
| 514 |
protected String getContextPath(HttpServletRequest req, boolean withTrailingSlash) { |
| 515 |
String contextPath = req.getRequestURL().toString();
|
| 516 |
if (withTrailingSlash)
|
| 517 |
return contextPath.endsWith("/")? contextPath: contextPath + '/'; |
| 518 |
return contextPath.endsWith("/")? contextPath.substring(0, contextPath.length()-1): contextPath; |
| 519 |
|
| 520 |
} |
| 521 |
|
| 522 |
/**
|
| 523 |
* @param req
|
| 524 |
* @param resp
|
| 525 |
* @param json
|
| 526 |
* @throws UnsupportedEncodingException
|
| 527 |
* @throws IOException
|
| 528 |
*/
|
| 529 |
protected void sendJson(HttpServletRequest req, HttpServletResponse resp, String json) throws UnsupportedEncodingException, IOException { |
| 530 |
ByteArrayOutputStream stream = new ByteArrayOutputStream(); |
| 531 |
OutputStreamWriter osWriter = new OutputStreamWriter(stream, "UTF8"); |
| 532 |
PrintWriter writer = new PrintWriter(osWriter); |
| 533 |
|
| 534 |
writer.write(json); |
| 535 |
writer.flush(); |
| 536 |
|
| 537 |
resp.setContentType("application/json;charset=UTF-8");
|
| 538 |
resp.setBufferSize(output); |
| 539 |
try {
|
| 540 |
copy(null, new ByteArrayInputStream(stream.toByteArray()), resp.getOutputStream(), req, null); |
| 541 |
} catch (ObjectNotFoundException e) {
|
| 542 |
// This should never happen with a null first parameter.
|
| 543 |
logger.error("", e);
|
| 544 |
resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); |
| 545 |
return;
|
| 546 |
} catch (InsufficientPermissionsException e) {
|
| 547 |
// This should never happen with a null first parameter.
|
| 548 |
logger.error("", e);
|
| 549 |
resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); |
| 550 |
return;
|
| 551 |
} catch (RpcException e) {
|
| 552 |
logger.error("", e);
|
| 553 |
resp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR); |
| 554 |
return;
|
| 555 |
} |
| 556 |
} |
| 557 |
|
| 558 |
/**
|
| 559 |
* Retrieve the path to the requested resource after removing the user namespace
|
| 560 |
* part and the subsequent namespace part that differentiates resources like files,
|
| 561 |
* groups, trash, etc.
|
| 562 |
*
|
| 563 |
* @param req the HTTP request
|
| 564 |
* @param namespace the subnamespace
|
| 565 |
* @return the inner path
|
| 566 |
*/
|
| 567 |
protected String getInnerPath(HttpServletRequest req, String namespace) { |
| 568 |
// Strip the username part
|
| 569 |
String path;
|
| 570 |
try {
|
| 571 |
path = getUserPath(req); |
| 572 |
} catch (ObjectNotFoundException e) {
|
| 573 |
throw new RuntimeException(e.getMessage()); |
| 574 |
} |
| 575 |
// Chop the resource namespace part
|
| 576 |
path = path.substring(namespace.length()); |
| 577 |
return path;
|
| 578 |
} |
| 579 |
|
| 580 |
/**
|
| 581 |
* Confirms the validity of the request.
|
| 582 |
*
|
| 583 |
* @param request the incoming HTTP request
|
| 584 |
* @return true if the request is valid, false otherwise
|
| 585 |
*/
|
| 586 |
private boolean isRequestValid(HttpServletRequest request) { |
| 587 |
if (logger.isDebugEnabled()) {
|
| 588 |
Enumeration headers = request.getHeaderNames();
|
| 589 |
while (headers.hasMoreElements()) {
|
| 590 |
String h = (String) headers.nextElement(); |
| 591 |
logger.debug(h + ": " + request.getHeader(h));
|
| 592 |
} |
| 593 |
} |
| 594 |
// Fetch the timestamp used to guard against replay attacks.
|
| 595 |
long timestamp = 0; |
| 596 |
boolean useGssDateHeader = true; |
| 597 |
try {
|
| 598 |
timestamp = request.getDateHeader(GSS_DATE_HEADER); |
| 599 |
if (timestamp == -1) { |
| 600 |
useGssDateHeader = false;
|
| 601 |
timestamp = request.getDateHeader(DATE_HEADER); |
| 602 |
} |
| 603 |
} catch (IllegalArgumentException e) { |
| 604 |
return false; |
| 605 |
} |
| 606 |
if (!isTimeValid(timestamp))
|
| 607 |
return false; |
| 608 |
|
| 609 |
// Fetch the Authorization header and find the user specified in it.
|
| 610 |
String auth = request.getHeader(AUTHORIZATION_HEADER);
|
| 611 |
if (auth == null) |
| 612 |
return false; |
| 613 |
String[] authParts = auth.split(" "); |
| 614 |
if (authParts.length != 2) |
| 615 |
return false; |
| 616 |
String username = authParts[0]; |
| 617 |
String signature = authParts[1]; |
| 618 |
User user = null;
|
| 619 |
try {
|
| 620 |
user = getService().findUser(username); |
| 621 |
} catch (RpcException e) {
|
| 622 |
return false; |
| 623 |
} |
| 624 |
if (user == null) |
| 625 |
return false; |
| 626 |
|
| 627 |
request.setAttribute(USER_ATTRIBUTE, user); |
| 628 |
|
| 629 |
// Validate the signature in the Authorization header.
|
| 630 |
String dateHeader = useGssDateHeader? request.getHeader(GSS_DATE_HEADER):
|
| 631 |
request.getHeader(DATE_HEADER); |
| 632 |
String data;
|
| 633 |
// Remove the servlet path from the request URI.
|
| 634 |
String p = request.getRequestURI();
|
| 635 |
String servletPath = request.getContextPath() + request.getServletPath();
|
| 636 |
p = p.substring(servletPath.length()); |
| 637 |
data = request.getMethod() + dateHeader + p; |
| 638 |
return isSignatureValid(signature, user, data);
|
| 639 |
} |
| 640 |
|
| 641 |
/**
|
| 642 |
* Calculates the signature for the specified data String and then
|
| 643 |
* compares it against the provided signature. If the signatures match,
|
| 644 |
* the method returns true. Otherwise it returns false.
|
| 645 |
*
|
| 646 |
* @param signature the signature to compare against
|
| 647 |
* @param user the current user
|
| 648 |
* @param data the data to sign
|
| 649 |
* @return true if the calculated signature matches the supplied one
|
| 650 |
*/
|
| 651 |
protected boolean isSignatureValid(String signature, User user, String data) { |
| 652 |
if (logger.isDebugEnabled())
|
| 653 |
logger.debug("server pre-signing data: "+data);
|
| 654 |
String serverSignature = null; |
| 655 |
// If the authentication token is not valid, the user must get another one.
|
| 656 |
if (user.getAuthToken() == null) |
| 657 |
return false; |
| 658 |
// Get an HMAC-SHA1 key from the authentication token.
|
| 659 |
SecretKeySpec signingKey = new SecretKeySpec(user.getAuthToken(), HMAC_SHA1); |
| 660 |
try {
|
| 661 |
// Get an HMAC-SHA1 Mac instance and initialize with the signing key.
|
| 662 |
Mac mac = Mac.getInstance(HMAC_SHA1); |
| 663 |
mac.init(signingKey); |
| 664 |
// Compute the HMAC on input data bytes.
|
| 665 |
byte[] rawHmac = mac.doFinal(data.getBytes()); |
| 666 |
serverSignature = new String(Base64.encodeBase64(rawHmac), "US-ASCII"); |
| 667 |
} catch (Exception e) { |
| 668 |
logger.error("Error while creating signature", e);
|
| 669 |
return false; |
| 670 |
} |
| 671 |
|
| 672 |
if (logger.isDebugEnabled())
|
| 673 |
logger.debug("Signature: client="+signature+", server="+serverSignature); |
| 674 |
if (!serverSignature.equals(signature))
|
| 675 |
return false; |
| 676 |
|
| 677 |
return true; |
| 678 |
} |
| 679 |
|
| 680 |
/**
|
| 681 |
* A helper method that checks if the timestamp of the request
|
| 682 |
* is within TIME_SKEW milliseconds of the current time. If
|
| 683 |
* the timestamp is older (or even newer) than that, it is
|
| 684 |
* considered invalid.
|
| 685 |
*
|
| 686 |
* @param timestamp the time of the request
|
| 687 |
* @return true if the timestamp is valid
|
| 688 |
*/
|
| 689 |
protected boolean isTimeValid(long timestamp) { |
| 690 |
if (timestamp == -1) |
| 691 |
return false; |
| 692 |
Calendar cal = Calendar.getInstance(); |
| 693 |
if (logger.isDebugEnabled())
|
| 694 |
logger.debug("Time: server=" + cal.getTimeInMillis() + ", client=" + timestamp); |
| 695 |
// Ignore the request if the timestamp is too far off.
|
| 696 |
if (Math.abs(timestamp - cal.getTimeInMillis()) > getConfiguration().getInt("timeSkew", 600000)) |
| 697 |
return false; |
| 698 |
return true; |
| 699 |
} |
| 700 |
|
| 701 |
protected boolean getAuthDeferred(HttpServletRequest req) { |
| 702 |
Boolean attr = (Boolean) req.getAttribute(AUTH_DEFERRED_ATTR); |
| 703 |
return attr == null? false: attr; |
| 704 |
} |
| 705 |
|
| 706 |
/**
|
| 707 |
* Return the actual requested path in the API namespace.
|
| 708 |
*
|
| 709 |
* @param request the servlet request we are processing
|
| 710 |
* @return the relative path
|
| 711 |
*/
|
| 712 |
@Override
|
| 713 |
protected String getRelativePath(HttpServletRequest request) { |
| 714 |
// Remove the servlet path from the request URI.
|
| 715 |
String p = request.getRequestURI();
|
| 716 |
String servletPath = request.getContextPath() + request.getServletPath();
|
| 717 |
String result = p.substring(servletPath.length());
|
| 718 |
if (result == null || result.equals("")) |
| 719 |
result = "/";
|
| 720 |
return result;
|
| 721 |
|
| 722 |
} |
| 723 |
} |