From 35b48d2e98fa5f7fc78f69630b8c6d63e9b5c33b Mon Sep 17 00:00:00 2001
From: felmer <felmer>
Date: Wed, 16 May 2007 07:17:24 +0000
Subject: [PATCH] add PasswordInput
SVN: 70
---
.../cisd/common/utilities/PasswordInput.java | 96 +++++++++++++++++++
1 file changed, 96 insertions(+)
create mode 100644 common/source/java/ch/systemsx/cisd/common/utilities/PasswordInput.java
diff --git a/common/source/java/ch/systemsx/cisd/common/utilities/PasswordInput.java b/common/source/java/ch/systemsx/cisd/common/utilities/PasswordInput.java
new file mode 100644
index 00000000000..6e1e5c09a5c
--- /dev/null
+++ b/common/source/java/ch/systemsx/cisd/common/utilities/PasswordInput.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2007 ETH Zuerich, CISD
+ *
+ * Licensed 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 ch.systemsx.cisd.common.utilities;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+/**
+ * Helper method for reading unvisible characters from <code>System.in</code>.
+ * Code adapted from <a href="http://java.sun.com/developer/technicalArticles/Security/pwordmask/">Password Masking in
+ * the Java Programming Language</a> by Qusay H. Mahmoud.
+ *
+ * Note: This is a hack! Sometimes characters become visible.
+ *
+ */
+public class PasswordInput
+{
+ private static class Eraser implements Runnable
+ {
+ private volatile boolean stop;
+
+ public void run()
+ {
+ int priority = Thread.currentThread().getPriority();
+ Thread.currentThread().setPriority(Thread.MAX_PRIORITY);
+ try
+ {
+ stop = true;
+ while (stop)
+ {
+ System.out.print("\010*");
+ try
+ {
+ Thread.sleep(1);
+ } catch (InterruptedException e)
+ {
+ Thread.currentThread().interrupt();
+ return;
+ }
+ }
+ } finally
+ {
+ Thread.currentThread().setPriority(priority);
+ }
+ }
+
+ void stopMasking()
+ {
+ this.stop = false;
+ }
+ }
+
+ /**
+ * Read non-echoed characters from the console until 'enter' has been pressed.
+ */
+ public static String readPassword()
+ {
+ Eraser eraser = new Eraser();
+ Thread mask = new Thread(eraser);
+ mask.start();
+
+ BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
+ String password = "";
+
+ try
+ {
+ password = in.readLine();
+ } catch (IOException ioe)
+ {
+ ioe.printStackTrace();
+ }
+ eraser.stopMasking();
+ return password;
+ }
+
+ public static void main(String[] args)
+ {
+ System.out.print("enter: ");
+ System.out.println(PasswordInput.readPassword());
+ }
+}
--
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