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/*
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* HarvesterRegistration.java
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*
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* Created on March 23, 2004, 4:44 PM
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*/
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package edu.ucsb.nceas.metacat.harvesterClient;
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import com.oreilly.servlet.ParameterParser;
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import java.io.File;
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import java.io.InputStream;
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import java.io.IOException;
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import java.io.PrintWriter;
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import java.sql.Connection;
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import java.sql.DriverManager;
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import java.sql.ResultSet;
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import java.sql.SQLException;
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import java.sql.SQLWarning;
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import java.sql.Statement;
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import java.text.ParseException;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Enumeration;
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import java.util.Properties;
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import javax.servlet.ServletContext;
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import javax.servlet.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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/**
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* HarvesterRegistration is a servlet that implements harvester registration.
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* The servlet reads parameters that were entered in a harvester registration
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* form, checks the validity of the values, stores the values in the database
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* by either inserting, updating, or removing a record in the
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* HARVEST_SITE_SCHEDULE table.
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*
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* @author costa
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*
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*/
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public class HarvesterRegistration extends HttpServlet {
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/*
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* Object fields
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*/
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final private long millisecondsPerDay = (1000 * 60 * 60 * 24);
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private String password; // database password, from properties file
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private String url; // database url, from properties file
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private String user; // database user, from properties file
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/*
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* Object methods
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*/
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/**
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* Closes the database connection.
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*
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* @param conn The connection.
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*/
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private void closeConnection(Connection conn) {
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try {
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if (conn != null) {
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conn.close();
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}
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}
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catch (SQLException e) {
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// ignored
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}
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}
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/**
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* Inserts a record to the HARVEST_SITE_SCHEDULE table.
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*
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* @param out the PrintWriter output object
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* @param conn the Connection
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* @param siteScheduleID the primary key for the table
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* @param contactEmail contact email address of the site user
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* @param documentListURL the URL of the harvester document list at the site
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* @param ldapDN the site user's LDAP DN
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* @param ldapPwd the site user's LDAP password
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* @param unit the update frequency unit, e.g. "days", "weeks"
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* @param updateFrequency the update frequency, an integer in range 1-99
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*/
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private void dbInsert(PrintWriter out,
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Connection conn,
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int siteScheduleID,
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String contactEmail,
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String documentListURL,
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String ldapDN,
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String ldapPwd,
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String unit,
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int updateFrequency
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) {
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String dateNextHarvest;
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long delta;
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Date dnh; // Date of next harvest
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Date now; // Today's date
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String query;
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Statement stmt;
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long timeNextHarvest;
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SimpleDateFormat writeFormat = new SimpleDateFormat("dd-MMM-yyyy");
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// Calculate the value of delta, the number of milliseconds between the
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// last harvest date and the next harvest date.
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delta = updateFrequency * millisecondsPerDay;
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if (unit.equals("weeks")) {
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delta *= 7;
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}
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else if (unit.equals("months")) {
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delta *= 30;
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}
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now = new Date();
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timeNextHarvest = now.getTime();
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dnh = new Date(timeNextHarvest);
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dateNextHarvest = writeFormat.format(dnh);
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try {
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stmt = conn.createStatement();
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query = "insert into HARVEST_SITE_SCHEDULE " +
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"(SITE_SCHEDULE_ID, CONTACT_EMAIL, DOCUMENTLISTURL, LDAPDN, LDAPPWD, " +
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"UNIT, UPDATEFREQUENCY, DATENEXTHARVEST) " +
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"values(" + siteScheduleID + "," +
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quoteString(contactEmail) + "," +
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quoteString(documentListURL) + "," +
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quoteString(ldapDN) + "," +
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quoteString(ldapPwd) + "," +
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quoteString(unit) + "," +
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updateFrequency + "," +
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quoteString(dateNextHarvest) + ")";
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System.out.println(query);
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stmt.executeUpdate(query);
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stmt.close();
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reportResults(out, ldapDN, contactEmail, documentListURL, updateFrequency,
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unit, dateNextHarvest);
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}
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catch(SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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}
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}
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/**
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* Removes a record from the HARVEST_SITE_SCHEDULE table.
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*
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* @param out the PrintWriter output object
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* @param conn the Connection
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* @param siteScheduleID the primary key for the table
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* @param ldapDN the site user's LDAP DN
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*/
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private void dbRemove(PrintWriter out,
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Connection conn,
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int siteScheduleID,
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String ldapDN
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) {
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String query = "DELETE FROM HARVEST_SITE_SCHEDULE WHERE " +
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"SITE_SCHEDULE_ID=" + siteScheduleID;
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int nRecords = 0;
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Statement stmt;
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try {
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stmt = conn.createStatement();
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System.out.println(query);
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nRecords = stmt.executeUpdate(query);
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stmt.close();
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System.out.println(nRecords + " record(s) removed.");
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if (nRecords > 0) {
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out.println("Harvester registration removed for user " + ldapDN);
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}
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else {
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out.println("A problem was encountered removing registration for user "
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+ ldapDN);
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}
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}
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catch(SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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}
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}
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/**
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* Updates a record in the HARVEST_SITE_SCHEDULE table.
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*
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* @param out the PrintWriter output object
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* @param conn the Connection
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* @param siteScheduleID the primary key for the table
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* @param contactEmail contact email address of the site user
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* @param documentListURL the URL of the harvester document list at the site
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* @param ldapDN the site user's LDAP DN
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* @param ldapPwd the site user's LDAP password
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* @param unit the update frequency unit, e.g. "days", "weeks"
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* @param updateFrequency the update frequency, an integer in range 1-99
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* @param dateLastHarvest the date of last harvest,
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* e.g. "2004-04-30 00:00:00.0" or ""
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*/
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private void dbUpdate(PrintWriter out,
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Connection conn,
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int siteScheduleID,
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String contactEmail,
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String documentListURL,
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String ldapDN,
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String ldapPwd,
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String unit,
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int updateFrequency,
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String dateLastHarvest
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) {
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String dateNextHarvest;
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long delta;
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Date dlh; // Date of last harvest
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Date dnh; // Date of next harvest
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Date now = new Date(); // Today's date
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SimpleDateFormat readFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.S");
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SimpleDateFormat writeFormat = new SimpleDateFormat("dd-MMM-yyyy");
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Statement stmt;
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long timeLastHarvest;
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long timeNextHarvest;
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long timeNow = now.getTime();
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// Calculate the value of delta, the number of milliseconds between the
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// last harvest date and the next harvest date.
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delta = updateFrequency * millisecondsPerDay;
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if (unit.equals("weeks")) {
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delta *= 7;
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}
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else if (unit.equals("months")) {
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delta *= 30;
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}
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if (dateLastHarvest.equals("")) {
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timeNextHarvest = timeNow;
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}
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else {
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try {
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dlh = readFormat.parse(dateLastHarvest);
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timeLastHarvest = dlh.getTime();
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timeNextHarvest = timeLastHarvest + delta;
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timeNextHarvest = Math.max(timeNextHarvest, timeNow);
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}
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catch (ParseException e) {
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System.out.println("Error parsing date: " + dateLastHarvest +
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" " + e.getMessage());
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timeNextHarvest = timeNow;
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}
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}
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dnh = new Date(timeNextHarvest);
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dateNextHarvest = writeFormat.format(dnh);
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try {
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stmt = conn.createStatement();
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stmt.executeUpdate("UPDATE HARVEST_SITE_SCHEDULE SET CONTACT_EMAIL=" +
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quoteString(contactEmail) +
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" WHERE SITE_SCHEDULE_ID = " + siteScheduleID);
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stmt.executeUpdate("UPDATE HARVEST_SITE_SCHEDULE SET DOCUMENTLISTURL=" +
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quoteString(documentListURL) +
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" WHERE SITE_SCHEDULE_ID = " + siteScheduleID);
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stmt.executeUpdate("UPDATE HARVEST_SITE_SCHEDULE SET LDAPPWD=" +
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quoteString(ldapPwd) +
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" WHERE SITE_SCHEDULE_ID = " + siteScheduleID);
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stmt.executeUpdate("UPDATE HARVEST_SITE_SCHEDULE SET UNIT=" +
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quoteString(unit) +
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" WHERE SITE_SCHEDULE_ID = " + siteScheduleID);
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stmt.executeUpdate("UPDATE HARVEST_SITE_SCHEDULE SET UPDATEFREQUENCY=" +
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updateFrequency +
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" WHERE SITE_SCHEDULE_ID = " + siteScheduleID);
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stmt.executeUpdate("UPDATE HARVEST_SITE_SCHEDULE SET DATENEXTHARVEST=" +
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quoteString(dateNextHarvest) +
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" WHERE SITE_SCHEDULE_ID = " + siteScheduleID);
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stmt.close();
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reportResults(out, ldapDN, contactEmail, documentListURL, updateFrequency,
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unit, dateNextHarvest);
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}
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catch(SQLException e) {
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System.out.println("SQLException: " + e.getMessage());
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}
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}
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/**
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* Handles GET method requests. Displays the current registration info for
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* this user (if any), then allows the user to make changes and register or
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* unregister.
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*
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* @param req the request
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* @param res the response
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* @throws ServletException
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* @throws IOException
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*/
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public void doGet(HttpServletRequest req, HttpServletResponse res)
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throws ServletException, IOException {
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Connection conn = getConnection();
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String contactEmail = "";
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String documentListURL = "http://";
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HttpSession httpSession;
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String ldapDN;
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String ldapPwd;
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String query;
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int siteScheduleID;
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Statement stmt;
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String unit = "days";
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int updateFrequency = 1;
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httpSession = req.getSession(false);
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if (httpSession == null) {
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System.out.println("User did not log in.");
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return;
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}
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// The user name and password are stored as session attributes by the
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// HarvesterRegistrationLogin servlet.
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ldapDN = (String) httpSession.getAttribute("ldapDN");
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ldapPwd = (String) httpSession.getAttribute("ldapPwd");
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siteScheduleID = getSiteScheduleID(conn, ldapDN);
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// If the user is already registered, query the existing values and
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// initialize the form with them.
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if (siteScheduleID != 0) {
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query = "SELECT * FROM HARVEST_SITE_SCHEDULE WHERE SITE_SCHEDULE_ID=" +
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siteScheduleID;
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try {
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stmt = conn.createStatement();
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ResultSet rs = stmt.executeQuery(query);
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while (rs.next()) {
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contactEmail = rs.getString("CONTACT_EMAIL");
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documentListURL = rs.getString("DOCUMENTLISTURL");
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updateFrequency = rs.getInt("UPDATEFREQUENCY");
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unit = rs.getString("UNIT");
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}
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stmt.close();
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}
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catch (SQLException ex) {
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System.out.println("SQLException: " + ex.getMessage());
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}
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}
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res.setContentType("text/html");
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PrintWriter out = res.getWriter();
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// Print the registration form
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out.println("<HTML>");
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out.println("<HEAD>");
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out.println("<TITLE>Metacat Harvester Registration</TITLE>");
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out.println("</HEAD>");
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out.println("<BODY>");
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out.println("<H2><B>Metacat Harvester Registration</B></H2>");
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out.println("<FORM METHOD=POST>"); // posts to itself
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out.println("To register or changes values, enter all values ");
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out.println("below and click <B>Register</B>.<BR>");
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out.println("To unregister, simply click <B>Unregister</B>.<BR>");
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out.println("<BR><BR>");
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out.println("<pre>Email address: </pre>");
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out.println("<INPUT TYPE=TEXT NAME=contactEmail VALUE=");
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out.println(contactEmail + ">");
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out.println("<BR>");
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out.println("<pre>Harvest Document List URL: </pre>");
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out.println("<INPUT TYPE=TEXT NAME=documentListURL VALUE=");
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out.println(documentListURL + ">");
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out.println("<BR>");
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out.println("<pre>Harvest Frequency (1-99): </pre>");
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out.println("<INPUT TYPE=TEXT NAME=updateFrequency ");
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out.println("MAXLENGTH=2 SIZE=2 VALUE=");
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out.println(updateFrequency + ">");
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out.println("<BR>");
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out.println("<pre>Unit: </pre>");
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out.println("<INPUT TYPE=RADIO ");
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if (unit.equals("days")) out.println("CHECKED ");
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out.println("NAME=unit VALUE=days>day(s)");
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out.println("<INPUT TYPE=RADIO ");
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if (unit.equals("weeks")) out.println("CHECKED ");
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out.println("NAME=unit VALUE=weeks>week(s)");
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out.println("<INPUT TYPE=RADIO ");
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if (unit.equals("months")) out.println("CHECKED ");
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out.println("NAME=unit VALUE=months>month(s)");
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out.println("<BR><BR>");
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out.println("<INPUT TYPE=SUBMIT NAME=register VALUE=Register>");
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out.println("<INPUT TYPE=SUBMIT NAME=unregister VALUE=Unregister>");
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out.println("</BODY>");
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out.println("</HTML>");
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}
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393
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394
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395
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/**
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396
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* Handles POST method requests. Reads values as entered by the user in the
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397
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* harvester registration form and checks them for validity. Then either
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398
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* inserts, updates, or removes a record in the HARVEST_SITE_SCHEDULE table.
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399
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*
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400
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* @param req the request
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401
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* @param res the response
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* @throws ServletException
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403
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* @throws IOException
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404
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*/
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405
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public void doPost(HttpServletRequest req, HttpServletResponse res)
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406
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throws ServletException, IOException {
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407
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Connection conn = getConnection();
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408
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int maxValue;
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409
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boolean remove = false; // if true, remove record
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410
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int siteScheduleID;
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411
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String contactEmail;
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412
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String dateLastHarvest;
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413
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String dateNextHarvest;
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414
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String documentListURL;
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415
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HttpSession httpSession;
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String ldapDN;
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417
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String ldapPwd;
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ParameterParser parameterParser = new ParameterParser(req);
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String register;
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String unit;
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421
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String unregister;
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422
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int updateFrequency;
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423
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424
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httpSession = req.getSession(false);
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425
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426
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if (httpSession == null) {
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427
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System.out.println("User did not log in.");
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428
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return;
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429
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}
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430
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|
431
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// The user name and password are stored as session attributes by the
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432
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// HarvesterRegistrationLogin servlet
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433
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ldapDN = (String) httpSession.getAttribute("ldapDN");
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434
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ldapPwd = (String) httpSession.getAttribute("ldapPwd");
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435
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436
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contactEmail = parameterParser.getStringParameter("contactEmail", "None");
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437
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documentListURL = parameterParser.getStringParameter("documentListURL", "");
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438
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unit = parameterParser.getStringParameter("unit", "days");
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439
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updateFrequency = parameterParser.getIntParameter("updateFrequency", 1);
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440
|
register = parameterParser.getStringParameter("register", "");
|
441
|
unregister = parameterParser.getStringParameter("unregister", "");
|
442
|
remove = (unregister.equalsIgnoreCase("Unregister"));
|
443
|
siteScheduleID = getSiteScheduleID(conn, ldapDN);
|
444
|
dateLastHarvest = getDateLastHarvest(conn, siteScheduleID);
|
445
|
|
446
|
res.setContentType("text/plain");
|
447
|
PrintWriter out = res.getWriter();
|
448
|
|
449
|
if (siteScheduleID == 0) {
|
450
|
if (remove) {
|
451
|
// The user clicked Unregister, but no existing record was found
|
452
|
System.out.println("Unable to remove record for user " + ldapDN);
|
453
|
System.out.println("No matching record found in HARVEST_SITE_SCHEDULE");
|
454
|
out.println("No record found for user " + ldapDN + ".");
|
455
|
out.println("Since you were not registered, no action was taken.");
|
456
|
}
|
457
|
else {
|
458
|
maxValue = getMaxValue(conn,
|
459
|
"HARVEST_SITE_SCHEDULE",
|
460
|
"SITE_SCHEDULE_ID");
|
461
|
siteScheduleID = maxValue + 1;
|
462
|
dbInsert(out, conn, siteScheduleID, contactEmail, documentListURL,
|
463
|
ldapDN, ldapPwd, unit, updateFrequency);
|
464
|
}
|
465
|
}
|
466
|
else {
|
467
|
// Either update or remove an existing record
|
468
|
if (remove) {
|
469
|
dbRemove(out, conn, siteScheduleID, ldapDN);
|
470
|
}
|
471
|
else {
|
472
|
dbUpdate(out, conn, siteScheduleID, contactEmail, documentListURL,
|
473
|
ldapDN, ldapPwd, unit, updateFrequency, dateLastHarvest);
|
474
|
}
|
475
|
}
|
476
|
|
477
|
closeConnection(conn);
|
478
|
}
|
479
|
|
480
|
|
481
|
/**
|
482
|
* Gets a database connection.
|
483
|
*
|
484
|
* @return conn, the Connection object
|
485
|
*/
|
486
|
private Connection getConnection() {
|
487
|
Connection conn = null;
|
488
|
SQLWarning warn;
|
489
|
|
490
|
// Make the database connection
|
491
|
try {
|
492
|
System.out.println("Getting connection to Harvester tables");
|
493
|
conn = DriverManager.getConnection(url, user, password);
|
494
|
|
495
|
// If a SQLWarning object is available, print its warning(s).
|
496
|
// There may be multiple warnings chained.
|
497
|
warn = conn.getWarnings();
|
498
|
|
499
|
if (warn != null) {
|
500
|
while (warn != null) {
|
501
|
System.out.println("SQLState: " + warn.getSQLState());
|
502
|
System.out.println("Message: " + warn.getMessage());
|
503
|
System.out.println("Vendor: " + warn.getErrorCode());
|
504
|
System.out.println("");
|
505
|
warn = warn.getNextWarning();
|
506
|
}
|
507
|
}
|
508
|
}
|
509
|
catch (SQLException e) {
|
510
|
System.out.println("Database access failed " + e);
|
511
|
}
|
512
|
|
513
|
return conn;
|
514
|
}
|
515
|
|
516
|
|
517
|
/**
|
518
|
* Gets the date of last harvest value from the HARVEST_SITE_SCHEDULE table,
|
519
|
* given a siteScheduleID value (the primary key).
|
520
|
*
|
521
|
* @param conn the connection
|
522
|
* @param siteScheduleID the primary key
|
523
|
* @return dateLastHarvest the string stored in the table, e.g.
|
524
|
* "2004-04-30 00:00:00.0" or ""
|
525
|
*/
|
526
|
private String getDateLastHarvest(Connection conn, int siteScheduleID) {
|
527
|
String dateLastHarvest = "";
|
528
|
String query = "SELECT DATELASTHARVEST FROM HARVEST_SITE_SCHEDULE " +
|
529
|
"WHERE SITE_SCHEDULE_ID=" + siteScheduleID;
|
530
|
Statement stmt;
|
531
|
|
532
|
try {
|
533
|
stmt = conn.createStatement();
|
534
|
ResultSet rs = stmt.executeQuery(query);
|
535
|
|
536
|
while (rs.next()) {
|
537
|
dateLastHarvest = rs.getString("DATELASTHARVEST");
|
538
|
if (rs.wasNull()) {
|
539
|
dateLastHarvest = ""; // Convert null value to empty string
|
540
|
}
|
541
|
}
|
542
|
|
543
|
stmt.close();
|
544
|
}
|
545
|
catch (SQLException ex) {
|
546
|
System.out.println("SQLException: " + ex.getMessage());
|
547
|
}
|
548
|
|
549
|
return dateLastHarvest;
|
550
|
}
|
551
|
|
552
|
|
553
|
/**
|
554
|
* Gets the maximum value of an integer field from a table, given the table
|
555
|
* name and the field name.
|
556
|
*
|
557
|
* @param tableName the database table name
|
558
|
* @param fieldName the field name of the integer field in the table
|
559
|
* @return the maximum integer stored in the fieldName field of tableName
|
560
|
*/
|
561
|
private int getMaxValue(Connection conn, String tableName, String fieldName) {
|
562
|
int maxValue = 0;
|
563
|
int fieldValue;
|
564
|
String query = "SELECT " + fieldName + " FROM " + tableName;
|
565
|
Statement stmt;
|
566
|
|
567
|
try {
|
568
|
stmt = conn.createStatement();
|
569
|
ResultSet rs = stmt.executeQuery(query);
|
570
|
|
571
|
while (rs.next()) {
|
572
|
fieldValue = rs.getInt(fieldName);
|
573
|
maxValue = Math.max(maxValue, fieldValue);
|
574
|
}
|
575
|
|
576
|
stmt.close();
|
577
|
}
|
578
|
catch (SQLException ex) {
|
579
|
System.out.println("SQLException: " + ex.getMessage());
|
580
|
}
|
581
|
|
582
|
return maxValue;
|
583
|
}
|
584
|
|
585
|
|
586
|
/**
|
587
|
* Gets the siteScheduleID value from the HARVEST_SITE_SCHEDULE table, given
|
588
|
* the value of the ldapDN field.
|
589
|
*
|
590
|
* @param conn the database connection
|
591
|
* @param ldapDN the ldap DN string
|
592
|
* @return siteScheduleID, an integer, the primary key
|
593
|
*/
|
594
|
private int getSiteScheduleID(Connection conn, String ldapDN) {
|
595
|
String ldapDNValue; // value of LDAPDN field
|
596
|
String query = "SELECT * FROM HARVEST_SITE_SCHEDULE";
|
597
|
int siteScheduleID = 0;
|
598
|
Statement stmt;
|
599
|
|
600
|
try {
|
601
|
stmt = conn.createStatement();
|
602
|
ResultSet rs = stmt.executeQuery(query);
|
603
|
|
604
|
while (rs.next()) {
|
605
|
ldapDNValue = rs.getString("LDAPDN");
|
606
|
|
607
|
if (ldapDNValue.equalsIgnoreCase(ldapDN)) {
|
608
|
siteScheduleID = rs.getInt("SITE_SCHEDULE_ID");
|
609
|
}
|
610
|
}
|
611
|
|
612
|
stmt.close();
|
613
|
}
|
614
|
catch (SQLException ex) {
|
615
|
System.out.println("SQLException: " + ex.getMessage());
|
616
|
}
|
617
|
|
618
|
return siteScheduleID;
|
619
|
}
|
620
|
|
621
|
|
622
|
/**
|
623
|
* Initializes the servlet. Reads properties and initializes object fields.
|
624
|
*
|
625
|
* @throws ServletException
|
626
|
*/
|
627
|
public void init() throws ServletException {
|
628
|
String dbDriver;
|
629
|
Properties properties = loadProperties();
|
630
|
|
631
|
dbDriver = properties.getProperty("dbDriver");
|
632
|
password = properties.getProperty("password");
|
633
|
url = properties.getProperty("url");
|
634
|
user = properties.getProperty("user");
|
635
|
|
636
|
// Load the jdbc driver
|
637
|
try {
|
638
|
Class.forName(dbDriver);
|
639
|
}
|
640
|
catch (ClassNotFoundException e) {
|
641
|
System.out.println("Can't load driver " + e);
|
642
|
}
|
643
|
}
|
644
|
|
645
|
|
646
|
/**
|
647
|
* Loads Harvester properties from a configuration file.
|
648
|
*/
|
649
|
private Properties loadProperties() {
|
650
|
InputStream inputStream;
|
651
|
String path = "/harvester/harvester.properties";
|
652
|
Properties properties = new Properties();
|
653
|
ServletContext servletContext = getServletContext();
|
654
|
|
655
|
try {
|
656
|
inputStream = servletContext.getResourceAsStream(path);
|
657
|
properties.load(inputStream);
|
658
|
properties.list(System.out);
|
659
|
}
|
660
|
catch (IOException e) {
|
661
|
System.out.println("IOException: " + e.getMessage());
|
662
|
}
|
663
|
|
664
|
return properties;
|
665
|
}
|
666
|
|
667
|
|
668
|
/**
|
669
|
* Surrounds a string with single quotes.
|
670
|
* @param str the original string
|
671
|
* @return the quoted string
|
672
|
*/
|
673
|
private String quoteString(String str) {
|
674
|
return "'" + str + "'";
|
675
|
}
|
676
|
|
677
|
|
678
|
/**
|
679
|
* Reports the results of an insert or update to the client.
|
680
|
*
|
681
|
* @param out the PrintWriter
|
682
|
* @param ldapDN the LDAP DN string
|
683
|
* @param contactEmail the email address of the site contact
|
684
|
* @param documentListURL the URL of the harvester document list at the site
|
685
|
* @param updateFrequency the harvest update frequency
|
686
|
* @param unit the unit (e.g. "days", "weeks", "months"
|
687
|
* @param dateNextHarvest the date of the next scheduled harvest
|
688
|
*/
|
689
|
private void reportResults(PrintWriter out,
|
690
|
String ldapDN,
|
691
|
String contactEmail,
|
692
|
String documentListURL,
|
693
|
int updateFrequency,
|
694
|
String unit,
|
695
|
String dateNextHarvest
|
696
|
) {
|
697
|
out.println("Harvester registration updated for " + ldapDN);
|
698
|
out.println(" Email Address: " + contactEmail);
|
699
|
out.println(" Harvest Document List URL: " + documentListURL);
|
700
|
out.println(" Harvest Frequency: " + updateFrequency);
|
701
|
out.println(" Unit: " + unit);
|
702
|
out.println("");
|
703
|
out.println("Next scheduled harvest date: " + dateNextHarvest);
|
704
|
}
|
705
|
|
706
|
}
|