| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package examples.mail; |
| |
| import java.io.BufferedReader; |
| import java.io.Console; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.util.Locale; |
| |
| /** |
| * Utilities for mail examples |
| */ |
| class Utils { |
| |
| private Utils() { |
| // not instantiable |
| } |
| |
| /** |
| * If the initial password is: |
| * '*' - replace it with a line read from the system console |
| * '-' - replace it with next line from STDIN |
| * 'ABCD' - if the input is all upper case, use the field as an environment variable name |
| * |
| * Note: there are no guarantees that the password cannot be snooped. |
| * |
| * Even using the console may be subject to memory snooping, |
| * however it should be safer than the other methods. |
| * |
| * STDIN may require creating a temporary file which could be read by others |
| * Environment variables may be visible by using PS |
| */ |
| static String getPassword(String username, String password) throws IOException { |
| if ("-".equals(password)) { // stdin |
| BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); |
| password = in.readLine(); |
| } else if ("*".equals(password)) { // console |
| Console con = System.console(); // Java 1.6 |
| if (con != null) { |
| char[] pwd = con.readPassword("Password for " + username + ": "); |
| password = new String(pwd); |
| } else { |
| throw new IOException("Cannot access Console"); |
| } |
| } else if (password.equals(password.toUpperCase(Locale.ROOT))) { // environment variable name |
| final String tmp = System.getenv(password); |
| if (tmp != null) { // don't overwrite if variable does not exist (just in case password is all uppers) |
| password=tmp; |
| } |
| } |
| return password; |
| } |
| |
| } |