commandlineusermanager.java

aglet的部分源码

package com.ibm.aglets.tahiti;

/*
 * @(#)CommandLineUserManager.java
 * 
 * IBM Confidential-Restricted
 * 
 * OCO Source Materials
 * 
 * 03L7246 (c) Copyright IBM Corp. 1996, 1998
 * 
 * The source code for this program is not published or otherwise
 * divested of its trade secrets, irrespective of what has been
 * deposited with the U.S. Copyright Office.
 */

import com.ibm.aglet.system.AgletRuntime;
import com.ibm.awb.misc.Resource;
import com.ibm.awb.misc.FileUtils;

import java.security.cert.Certificate;
import java.security.KeyException;
import java.io.LineNumberReader;
import java.io.InputStreamReader;

import java.io.IOException;

public final class CommandLineUserManager extends UserManager {
	public CommandLineUserManager() {}
	private Resource createAgletsResourceForUser(String username) {
		Resource res = Resource.getResourceFor("aglets");

		if (res == null) {
			try {
				String propfile = 
					FileUtils.getPropertyFilenameForUser(username, "aglets");

				res = Resource.createResource("aglets", propfile, null);
				System.out.println("reading aglets property from " 
								   + propfile);
			} catch (Exception ex) {
				ex.printStackTrace();
			} 
		} 
		return res;
	}
	private String input(String title, String defval, boolean enforce) {
		String line = null;
		LineNumberReader r = 
			new LineNumberReader(new InputStreamReader(System.in));

		while (true) {
			System.out.print(title 
							 + (defval == null || defval.length() == 0 ? ":" 
								: "[" + defval + "]:"));
			System.out.flush();
			try {
				line = r.readLine();
			} catch (IOException ex) {}
			if (line == null) {
				System.exit(1);
			} 
			if (line.trim().length() != 0) {
				return line.trim();
			} else if (defval != null && defval.length() != 0) {
				return defval;
			} else if (enforce == false) {
				return null;
			} 
		} 
	}
	/*
	 * 
	 */
	private String inputUsername(String title) {
		return inputUsername(title, getDefaultUsername());
	}
	/*
	 * 
	 */
	private String inputUsername(String title, String defaultUsername) {
		return input(title, defaultUsername, true);
	}
	public Certificate login() {
		AgletRuntime runtime = AgletRuntime.getAgletRuntime();

		if (runtime == null) {
			return null;
		} 
		Certificate cert = null;
		String username = null;

		while (cert == null) {
			while (username == null) {
				username = inputUsername("login");

				// if(!isRegisteredUser(username)) {
				// System.out.println("The username is not registered.");
				// username = null;
				// }
			} 
			String password = input("password", "", false);

			if (password == null) {
				password = "";
			} 
			cert = runtime.authenticateOwner(username, password);
			if (cert == null) {
				System.out.println("Password is incorrect.");
				username = null;
			} 
		} 
		setUsername(username);
		setCertificate(cert);
		return cert;
	}
}