hash home dir

src/main/java/eu/eosc/life/keycloak/authentication/EoscCreateUserIfUniqueAuthenticator.java

@@ -48,6 +48,8 @@ import org.keycloak.storage.ldap.LDAPStorageProviderFactory;
 import org.keycloak.storage.user.ImportSynchronization;
 import org.keycloak.common.util.Time;
 
+import java.nio.charset.StandardCharsets;
+
 public class EoscCreateUserIfUniqueAuthenticator extends IdpCreateUserIfUniqueAuthenticator{
 	private static Logger logger = Logger.getLogger(EoscCreateUserIfUniqueAuthenticator.class);
 	private DirContext ctx = null;
@@ -199,9 +201,19 @@ public class EoscCreateUserIfUniqueAuthenticator extends IdpCreateUserIfUniqueAu
 		//givenName
 		attributes.put("givenName", firstname);
 		//uid
+                MessageDigest digest = MessageDigest.getInstance("SHA-256");
+                byte[] bytes = digest.digest(username.getBytes(StandardCharsets.UTF_8));
+                StringBuilder sb = new StringBuilder();
+                for(int i=0; i< bytes.length ;i++)
+                {
+                  sb.append(Integer.toString((bytes[i] & 0xff) + 0x100, 16).substring(1));
+                }
+                String hashed_un = sb.toString();
+
 		attributes.put("uid", username);
 		//homedir
-		attributes.put("homeDirectory", "/home/"+username);
+
+		attributes.put("homeDirectory", "/home/"+hashed_un.substring(0,16));
 		//shadowLastChange
 		attributes.put("shadowLastChange", 15140+"");
 		//shadowMin