Caldav: check credentials on each request

git-svn-id: http://svn.code.sf.net/p/davmail/code/trunk@728 3d1905a2-6b24-0410-a738-b14d5a86fcbd

src/java/davmail/caldav/CaldavConnection.java

@@ -155,8 +155,8 @@ public class CaldavConnection extends AbstractConnection {
                     sendUnauthorized();
                 } else {
                     decodeCredentials(headers.get("authorization"));
-                    // authenticate only once
-                    if (session == null) {
+                    // authenticate only once, but check credentials
+                    if (session == null || !session.checkCredentials(userName, password)) {
                         try {
                             session = ExchangeSessionFactory.getInstance(userName, password);
                         } catch (DavMailAuthenticationException e) {

src/java/davmail/exchange/ExchangeSession.java

@@ -263,6 +263,18 @@ public class ExchangeSession {
         return isExpired;
     }
 
+    /**
+     * Compare credentials to current session credentials.
+     *
+     * @param userName user name
+     * @param password user password
+     * @return true if credentials match
+     */
+    public boolean checkCredentials(String userName, String password) {
+        return userName != null && password != null
+                && userName.equals(poolKey.userName) && password.equals(poolKey.password);
+    }
+
     /**
      * Test authentication mode : form based or basic.
      *