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/**
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* '$RCSfile$'
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* Copyright: 2000 Regents of the University of California and the
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* National Center for Ecological Analysis and Synthesis
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*
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* '$Author: Serhan AKIN $'
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* '$Date: 2009-06-13 15:28:13 +0300 $'
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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package edu.ucsb.nceas.metacat.restservice;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.util.Enumeration;
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import java.util.Hashtable;
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import java.util.Timer;
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import javax.servlet.ServletContext;
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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.log4j.Logger;
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import edu.ucsb.nceas.metacat.DBUtil;
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import edu.ucsb.nceas.metacat.MetacatHandler;
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import edu.ucsb.nceas.metacat.util.RequestUtil;
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import edu.ucsb.nceas.metacat.util.SessionData;
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/**
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*
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* Implements Earthgrid REST API to Metacat <br/><br/>
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*
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* <ul>
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* <li>
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* <h3> EarthGrid Query Service</h3>
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* <ul><li>
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* <h3>Get & Authenticated Get:</h3>
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* is equal to Metacat's read action and returns a data file having
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* the specified <doc-id> in the resource path. For authenticated Get service, a session id must be provided
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* in the query string. <br/><br/>
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*
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* <b>REST URL:</b> <code>GET, [context-root]/objects/[doc-id]?sessionid=[sessionid] </code><br/>
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* <b>Returns:</b> data file <br/><br/>
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* </li>
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*
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* <li>
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* <h3>Query & Authenticated Query:</h3>
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* Metacat's equivalent is squery action but this function
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* receives a Earthgrid query document and returns Earthgrid resultset document by transforming those documents
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* to Metacat's equivalents by the means of Metacat Implementation in Earthgrid library. For authenticated Query service
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* a session id must be provided in the query string. See Earthgrid (a.k.a. Ecogrid) project for XSD files of
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* query and resultset documents<br/><br/>
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*
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* <b>REST URL:</b> <code>POST, [context-root]/objects?sessionid=[sessionid]</code> <br/>
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* <b>POST Data:</b> Earthgrid query document , Content-type: <code>text/xml</code><br/>
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* <b>Returns:</b> Earthgrid resultset document<br/><br/>
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*
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* </li>
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* </ul>
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*
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* </li>
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*
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* <li>
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* <h3> EarthGrid Authentication Service</h3>
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* <ul><li>
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* <h3>Login: </h3>
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* Receives username and password parameters in POST data and
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* returns SessionId (in XML format) or failure message and uses MetacatHandler's handleLoginAction function<br/><br/>
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*
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* <b>REST URL:</b> <code>POST, [context-root]/session?op=login</code> <br/>
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* <b>POST Data:</b> username=[username]&password=[password], Content-type: <code>application/x-www-form-urlencoded</code>
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* <b>Returns:</b> sessionId in XML format<br/><br/>
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* </li>
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*
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* <li>
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* <h3>Logout: </h3>
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* Receives session Id parameters in querystring and returns xml message, calls
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* MetacatHandler's handleLogoutAction function<br/><br/>
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*
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* <b>REST URL:</b> <code>GET, [context-root]/session?op=logout&sessionid=[sessionid]</code> <br/>
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* <b>Returns:</b> message in XML format<br/><br/>
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* </li>
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* </ul>
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*
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* <li>
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* <h3>EarthGrid Put Service</h3>
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*
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* <ul>
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* <li><h3>Update/Insert: </h3>
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* <br/>
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* <b>REST URL:</b> <code>PUT, [context-root]/objects/[doc-id]?op={update|insert}&sessionid=[sessionid]</code> <br/>
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* <b>POST Data:</b> document object, Content-type: <code>text/xml</code><br/>
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* <b>Returns:</b> message in XML format<br/><br/>
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* </li>
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*
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* <li><h3>Delete: </h3>
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* <br/>
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* <b>REST URL:</b> <code>DELETE, [context-root]/objects/[doc-id]?sessionid=[sessionid]</code> <br/>
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* <b>Returns:</b> message in XML format<br/><br/>
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* </li>
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* </ul>
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* </li>
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*
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* <li>
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* <h3>EarthGrid Identifier Service</h3><br/>
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*
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* <ul>
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* <li><h3>isRegistered: </h3> <br/>
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* <b>REST URL:</b> <code>GET, [context-root]/identifier/[doc-id]?op=isregistered</code> <br/>
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* <b>Returns:</b> message in XML format<br/><br/>
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* </li>
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* <li><h3>getAllDocIds:</h3> <br/>
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* <b>REST URL:</b> <code>GET, [context-root]/identifier?op=getalldocids</code> <br/>
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* <b>Returns:</b> document id list in XML format<br/><br/>
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* </li>
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*
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* <li><h3>addLSID Function:</h3>
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* Metacat does not support this function <br/>
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* <b>REST URL:</b> <code>PUT, [context-root]/identifier/[doc-id]</code> <br/>
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* <b>Returns:</b> error message in XML format<br/><br/>
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* </li>
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*
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* <li><h3>getNextRevision:</h3> <br/>
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* <b>REST URL:</b> <code>GET, [context-root]/identifier/[doc-id]?op=getnextrevision</code> <br/>
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* <b>Returns:</b> message in XML format<br/><br/>
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* </li>
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*
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* <li><h3>getNextObject:</h3> <br/>
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* <b>REST URL:</b> <code>GET, [context-root]/identifier?op=getnextobject&scope=[scope]</code> <br/>
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* <b>Returns:</b> message in XML format<br/><br/>
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* </li>
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*
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* </li>
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* </ul>
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*
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*/
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public class ResourceHandler {
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/**HTTP Verb GET*/
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public static final byte GET = 1;
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/**HTTP Verb POST*/
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public static final byte POST = 2;
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/**HTTP Verb PUT*/
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public static final byte PUT = 3;
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/**HTTP Verb DELETE*/
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public static final byte DELETE = 4;
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/*
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* API Resources
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*/
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private static final String RESOURCE_OBJECTS = "objects";
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private static final String RESOURCE_SESSION = "session";
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private static final String RESOURCE_IDENTIFIER = "identifier";
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/*
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* API Functions used as URL parameters
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*/
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private static final String FUNCTION_KEYWORD = "op";
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private static final String FUNCTION_NAME_LOGIN = "login";
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private static final String FUNCTION_NAME_LOGOUT = "logout";
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private static final String FUNCTION_NAME_ISREGISTERED = "isregistered";
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private static final String FUNCTION_NAME_GETALLDOCS = "getalldocids";
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private static final String FUNCTION_NAME_GETNEXTREV = "getnextrevision";
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private static final String FUNCTION_NAME_GETNEXTOBJ = "getnextobject";
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private static final String FUNCTION_NAME_INSERT = "insert";
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private static final String FUNCTION_NAME_UPDATE = "update";
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private ServletContext servletContext;
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private Logger logMetacat;
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private MetacatHandler handler;
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private HttpServletRequest request;
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private HttpServletResponse response;
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private String username;
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private String password;
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private String sessionId;
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private String[] groupNames;
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private Hashtable<String, String[]> params;
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/**Initializes new instance by setting servlet context,request and response*/
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public ResourceHandler(ServletContext servletContext,
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HttpServletRequest request, HttpServletResponse response) {
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this.servletContext = servletContext;
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this.request = request;
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this.response = response;
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}
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/**
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* copies request parameters to a hashtable which is given as argument to native metacathandler functions
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*/
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private void initParams() {
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String name = null;
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String[] value = null;
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Enumeration paramlist = request.getParameterNames();
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while (paramlist.hasMoreElements()) {
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name = (String) paramlist.nextElement();
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value = request.getParameterValues(name);
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params.put(name, value);
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}
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}
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/**
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*
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* Load user details of metacat session from the request
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*
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*/
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private void loadSessionData() {
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SessionData sessionData = RequestUtil.getSessionData(request);
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username = sessionData.getUserName();
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password = sessionData.getPassword();
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groupNames = sessionData.getGroupNames();
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sessionId = sessionData.getId();
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if (username == null)
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username = "public";
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}
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/**
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* This function is called from REST APU servlet and handles each request to the servlet
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*
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* @param httpVerb (GET, POST, PUT or DELETE)
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*/
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public void handle(byte httpVerb) {
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logMetacat = Logger.getLogger(ResourceHandler.class);
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try {
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String resource = request.getServletPath();
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boolean status = false;
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if (resource != null) {
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resource = request.getServletPath().substring(1);
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System.out.println("accessing resource: " + resource);
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params = new Hashtable<String, String[]>();
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initParams();
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Timer timer = new Timer();
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handler = new MetacatHandler(servletContext, timer);
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if (resource.equals(RESOURCE_SESSION) && httpVerb == POST
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&& params.get(FUNCTION_KEYWORD) != null) {
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if (params.get(FUNCTION_KEYWORD)[0]
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.equals(FUNCTION_NAME_LOGIN)) {
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login();
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status = true;
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} else if (params.get(FUNCTION_KEYWORD)[0]
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.equals(FUNCTION_NAME_LOGOUT)) {
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logout();
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status = true;
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}
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} else if (resource.equals(RESOURCE_OBJECTS)) {
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loadSessionData();
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String objectId = request.getPathInfo();
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if (objectId != null && objectId.length() > 1)
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objectId = request.getPathInfo().substring(1); //trim the slash
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System.out.println("verb:" + httpVerb);
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System.out.println("objectId:" + objectId);
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if (httpVerb == GET) {
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getObject(objectId);
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status = true;
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} else if (httpVerb == POST) {
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query();
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status = true;
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} else if (httpVerb == PUT) {
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putObject(objectId);
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status = true;
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} else if (httpVerb == DELETE) {
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deleteObject(objectId);
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status = true;
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}
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} else if (resource.equals(RESOURCE_IDENTIFIER)) {
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String identifierId = request.getPathInfo();
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if (identifierId != null && identifierId.length() > 1)
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identifierId = request.getPathInfo().substring(1); //trim the slash
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System.out.println("identifierId:" + identifierId);
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if (httpVerb == GET) {
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String op = params.get(FUNCTION_KEYWORD)[0];
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System.out.println("op:" + op);
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if (op.equals(FUNCTION_NAME_ISREGISTERED)) {
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isRegistered(identifierId);
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status = true;
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} else if (op.equals(FUNCTION_NAME_GETALLDOCS)) {
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getAllDocIds();
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status = true;
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} else if (op.equals(FUNCTION_NAME_GETNEXTREV)) {
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getNextRevision(identifierId);
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status = true;
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} else if (op.equals(FUNCTION_NAME_GETNEXTOBJ)) {
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getNextObject();
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status = true;
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}
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} else if (httpVerb == PUT) {
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//Earthgrid API > Identifier Service > addLSID Function
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printError(
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"This method is not supported by metacat. To "
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+ "add a new LSID, add a document to metacat.",
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response);
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status = true;
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}
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}
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if (!status)
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printError("Incorrect parameters!", response);
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} else {
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printError("Incorrect resource!", response);
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}
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} catch (Exception e) {
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logMetacat.error(e.getMessage());
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e.printStackTrace();
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}
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}
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/**
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* Earthgrid API > Identifier Service > isRegistered Function : calls MetacatHandler > handleIdIsRegisteredAction
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* @param identifierId
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* @throws IOException
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*/
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private void isRegistered(String identifierId) throws IOException {
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params.put("docid", new String[] { identifierId });
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PrintWriter out = response.getWriter();
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handler.handleIdIsRegisteredAction(out, params, response);
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out.close();
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}
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/**
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* Earthgrid API > Identifier Service > getAllDocIds Function : calls MetacatHandler > handleGetAllDocidsAction
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* @throws IOException
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*/
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private void getAllDocIds() throws IOException {
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PrintWriter out = response.getWriter();
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handler.handleGetAllDocidsAction(out, params, response);
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out.close();
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}
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/**
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* Earthgrid API > Identifier Service > getNextRevision Function : calls MetacatHandler > handleGetRevisionAndDocTypeAction
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* @param identifierId
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* @throws IOException
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*/
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private void getNextRevision(String identifierId) throws IOException {
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params.put("docid", new String[] { identifierId });
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PrintWriter out = response.getWriter();
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//handler.handleGetRevisionAndDocTypeAction(out, params);
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try {
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// Make sure there is a docid
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if (identifierId == null || identifierId.equals("")) {
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throw new Exception("User didn't specify docid!");
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}//if
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// Create a DBUtil object
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DBUtil dbutil = new DBUtil();
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// Get a rev and doctype
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String revAndDocType = dbutil
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.getCurrentRevisionAndDocTypeForGivenDocument(identifierId);
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int revision = Integer.parseInt(revAndDocType.split(";")[0]) + 1;
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387
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out.println("<?xml version=\"1.0\"?>");
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out.print("<next-revision>");
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out.print(revision);
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out.print("</next-revision>");
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} catch (Exception e) {
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// Handle exception
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out.println("<?xml version=\"1.0\"?>");
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out.println("<error>");
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out.println(e.getMessage());
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out.println("</error>");
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}
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400
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out.close();
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}
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403
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|
404
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/**
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405
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* Earthgrid API > Identifier Service > getNextObject Function : calls MetacatHandler > handleGetMaxDocidAction
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* @throws IOException
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*/
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408
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private void getNextObject() throws IOException {
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409
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PrintWriter out = response.getWriter();
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handler.handleGetMaxDocidAction(out, params, response);
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out.close();
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}
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413
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414
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/**
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415
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* Earthgrid API > Query Service > Get Function : calls MetacatHandler > handleReadAction
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416
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*
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417
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* @param objectId ID of data object to be read
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418
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*/
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419
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private void getObject(String objectId) {
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420
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params.put("docid", new String[] { objectId });
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handler.handleReadAction(params, request, response, username, password,
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422
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groupNames);
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423
|
}
|
424
|
|
425
|
/**
|
426
|
* Earthgrid API > Query Service > Query Function : translates ecogrid query document to metacat query
|
427
|
* then calls DBQuery > createResultDocument function and then again translate resultset to ecogrid resultset
|
428
|
*
|
429
|
* NOTE:
|
430
|
* This is the only method that uses EcoGrid classes for its implementation.
|
431
|
* It does so because it takes an EcoGrid Query as input, and outputs an
|
432
|
* EcoGrid ResultSet document. These documents are parsed by the auto-generated
|
433
|
* EcoGrid classes from axis, and so we link to them here rather than re-inventing them.
|
434
|
* This creates a circular dependency, because the Metacat classes are needed
|
435
|
* to build the EcoGrid implementation, and the EcoGrid jars are needed to build this query()
|
436
|
* method. This circularity could be resolved by moving the EcoGrid classes
|
437
|
* to Metacat directly. As we transition away from EcoGrid SOAP methods in
|
438
|
* favor of these REST interfaces, this circular dependency can be eliminated.
|
439
|
*
|
440
|
* @throws Exception
|
441
|
*/
|
442
|
private void query() throws Exception {
|
443
|
/* This block commented out because of the EcoGrid circular dependency.
|
444
|
* For now, query will not be supported until the circularity can be
|
445
|
* resolved, probably by movind the ecogrid query syntax transformers
|
446
|
* directly into the Metacat codebase. MBJ 2010-02-03
|
447
|
|
448
|
try {
|
449
|
EcogridQueryParser parser = new EcogridQueryParser(request
|
450
|
.getReader());
|
451
|
parser.parseXML();
|
452
|
QueryType queryType = parser.getEcogridQuery();
|
453
|
EcogridJavaToMetacatJavaQueryTransformer queryTransformer =
|
454
|
new EcogridJavaToMetacatJavaQueryTransformer();
|
455
|
QuerySpecification metacatQuery = queryTransformer
|
456
|
.transform(queryType);
|
457
|
|
458
|
DBQuery metacat = new DBQuery();
|
459
|
|
460
|
boolean useXMLIndex = (new Boolean(PropertyService
|
461
|
.getProperty("database.usexmlindex"))).booleanValue();
|
462
|
String xmlquery = "query"; // we don't care the query in resultset,
|
463
|
// the query can be anything
|
464
|
PrintWriter out = null; // we don't want metacat result, so set out null
|
465
|
|
466
|
// parameter: queryspecification, user, group, usingIndexOrNot
|
467
|
StringBuffer result = metacat.createResultDocument(xmlquery,
|
468
|
metacatQuery, out, username, groupNames, useXMLIndex);
|
469
|
|
470
|
// create result set transfer
|
471
|
String saxparser = PropertyService.getProperty("xml.saxparser");
|
472
|
MetacatResultsetParser metacatResultsetParser = new MetacatResultsetParser(
|
473
|
new StringReader(result.toString()), saxparser, queryType
|
474
|
.getNamespace().get_value());
|
475
|
ResultsetType records = metacatResultsetParser.getEcogridResult();
|
476
|
|
477
|
System.out
|
478
|
.println(EcogridResultsetTransformer.toXMLString(records));
|
479
|
response.setContentType("text/xml");
|
480
|
out = response.getWriter();
|
481
|
out.print(EcogridResultsetTransformer.toXMLString(records));
|
482
|
|
483
|
} catch (Exception e) {
|
484
|
e.printStackTrace();
|
485
|
}*/
|
486
|
response.setContentType("text/xml");
|
487
|
PrintWriter out = response.getWriter();
|
488
|
out.print("<error>Query operation not yet supported by Metacat.</error>");
|
489
|
out.close();
|
490
|
}
|
491
|
|
492
|
/**
|
493
|
* Earthgrid API > Put Service >Put Function : calls MetacatHandler > handleInsertOrUpdateAction
|
494
|
*
|
495
|
* @param objectId ID of data object to be inserted or updated
|
496
|
* @throws IOException
|
497
|
*/
|
498
|
private void putObject(String objectId) throws IOException {
|
499
|
|
500
|
String action = request.getParameter(FUNCTION_KEYWORD);
|
501
|
|
502
|
if (action.equals(FUNCTION_NAME_UPDATE)
|
503
|
|| action.equals(FUNCTION_NAME_INSERT)) {
|
504
|
BufferedReader reader = request.getReader();
|
505
|
StringBuffer buffer = new StringBuffer();
|
506
|
String line = null;
|
507
|
while ((line = reader.readLine()) != null) {
|
508
|
buffer.append(line);
|
509
|
}
|
510
|
|
511
|
params.put("docid", new String[] { objectId });
|
512
|
params.put("doctext", new String[] { buffer.toString().trim() });
|
513
|
params.put("action", new String[] { action });
|
514
|
|
515
|
if (username != null && !username.equals("public")) {
|
516
|
PrintWriter out = response.getWriter();
|
517
|
handler.handleInsertOrUpdateAction(request, response, out,
|
518
|
params, username, groupNames);
|
519
|
out.close();
|
520
|
} else {
|
521
|
printError("Permission denied for user " + username, response);
|
522
|
|
523
|
}
|
524
|
} else {
|
525
|
printError("Specifiy the operation type.(update or insert)",
|
526
|
response);
|
527
|
}
|
528
|
|
529
|
}
|
530
|
|
531
|
/**
|
532
|
* Earthgrid API > Put Service > Delete Function : calls MetacatHandler > handleDeleteAction
|
533
|
*
|
534
|
* @param objectId ID of data object to be deleted
|
535
|
* @throws IOException
|
536
|
*/
|
537
|
private void deleteObject(String objectId) throws IOException {
|
538
|
params.put("docid", new String[] { objectId });
|
539
|
PrintWriter out = response.getWriter();
|
540
|
handler.handleDeleteAction(out, params, request, response, username,
|
541
|
groupNames);
|
542
|
out.close();
|
543
|
}
|
544
|
|
545
|
/**
|
546
|
* Earthgrid API > Authentication Service > Login Function : calls MetacatHandler > handleLoginAction
|
547
|
*
|
548
|
* @throws IOException
|
549
|
*/
|
550
|
private void login() throws IOException {
|
551
|
PrintWriter out = response.getWriter();
|
552
|
handler.handleLoginAction(out, params, request, response);
|
553
|
out.close();
|
554
|
}
|
555
|
|
556
|
/**
|
557
|
* Earthgrid API > Authentication Service > Logout Function : calls MetacatHandler > handleLogoutAction
|
558
|
*
|
559
|
* @throws IOException
|
560
|
*/
|
561
|
private void logout() throws IOException {
|
562
|
PrintWriter out = response.getWriter();
|
563
|
handler.handleLogoutAction(out, params, request, response);
|
564
|
out.close();
|
565
|
}
|
566
|
|
567
|
/**
|
568
|
* Prints xml response
|
569
|
* @param message Message to be displayed
|
570
|
* @param response Servlet response that xml message will be printed
|
571
|
* */
|
572
|
private void printError(String message, HttpServletResponse response) {
|
573
|
try {
|
574
|
PrintWriter out = response.getWriter();
|
575
|
response.setContentType("text/xml");
|
576
|
out.println("<?xml version=\"1.0\"?>");
|
577
|
out.println("<error>");
|
578
|
out.println(message);
|
579
|
out.println("</error>");
|
580
|
out.close();
|
581
|
} catch (IOException e) {
|
582
|
e.printStackTrace();
|
583
|
}
|
584
|
}
|
585
|
|
586
|
}
|