Added authentification for uni/hs server

--> added serversession, serversessionmanager
--> missing implementation for server authentication

1 files changed, 30 insertions, 0 deletions

diff --git a/src/main/java/org/openslx/imagemaster/util/RandomString.java b/src/main/java/org/openslx/imagemaster/util/RandomString.java
new file mode 100644
index 0000000..a0e9419
--- /dev/null
+++ b/src/main/java/org/openslx/imagemaster/util/RandomString.java
@@ -0,0 +1,30 @@
+package org.openslx.imagemaster.util;
+
+import java.security.SecureRandom;
+
+/**
+ * Generate secure random strings
+ * @author nils
+ *
+ */
+public class RandomString {
+	private static final String lettersSpecial="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890+-$%&/()=?@";
+	private static final String letters="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
+	private static final SecureRandom random = new SecureRandom();
+	
+	/**
+	 * Generate a random string.
+	 * @param length the length of the string
+	 * @param specialChars whether to use special charachters or not
+	 * @return the generated string
+	 */
+	public static String generate(int length, boolean specialChars) {
+		String used = (specialChars)? lettersSpecial : letters;
+		String result = "";
+		for (int i = 0; i < length; i++) {
+			int index = (int)(random.nextDouble()*used.length());
+			result += used.substring( index, index + 1 );
+		}
+		return result;
+	}
+}