SSL connections update: notice about untrusted certificates and allow the user save...

[pub/Android/ownCloud.git] / src / com / owncloud / android / network / SslAnalyzer.java

diff --git a/src/com/owncloud/android/network/SslAnalyzer.java b/src/com/owncloud/android/network/SslAnalyzer.java
new file mode 100644 (file)
index 0000000..2f02c4b
--- /dev/null
+++ b/src/com/owncloud/android/network/SslAnalyzer.java
@@ -0,0 +1,82 @@
+/* ownCloud Android client application
+ *   Copyright (C) 2011  Bartek Przybylski
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+package com.owncloud.android.network;
+
+import java.security.cert.CertPathValidatorException;
+import java.security.cert.CertificateExpiredException;
+import java.security.cert.CertificateNotYetValidException;
+
+import javax.net.ssl.SSLException;
+import javax.net.ssl.SSLPeerUnverifiedException;
+
+import com.owncloud.android.operations.RemoteOperationResult;
+
+/**
+ * Helper class to check if a SSL error is related to a condition that could be avoided with assistance from the user.
+ * 
+ * @author David A. Velasco
+ */
+public class SslAnalyzer {
+    
+    /**
+     * Search for a SSL-related exception in a remote operation result that can be recoverable
+     * by allowing the user to state the reliability of the certificate from the server. 
+     * 
+     * @param result        Result of a remote operation.
+     * @return              An exception instance that caused the failure of the remote operation and that can be avoided if the user
+     *                      states the certificate from the server as reliable; or NULL if the result is that's not possible
+     */
+    public static Exception getRecoverableException(RemoteOperationResult result) {
+        Exception ret = null;
+        SSLException e = (SSLException)result.getException();
+        Throwable cause = null;
+        if (e != null) {
+            if (e instanceof SSLPeerUnverifiedException) {
+                ret = e;
+                
+            } else { 
+                cause = e.getCause();
+                Throwable previousCause = null;
+                boolean recoverableCertException = false;
+                while (cause != null && cause != previousCause && !recoverableCertException) {     // getCause() is not funny
+                    recoverableCertException = (  cause instanceof CertPathValidatorException ||
+                                                cause instanceof CertificateExpiredException ||
+                                                cause instanceof CertificateNotYetValidException );
+                    if (recoverableCertException)
+                        ret = (Exception)cause;
+                    previousCause = cause;
+                    cause = cause.getCause();
+                }
+            }
+        }
+        return ret;
+    }
+    
+    
+    /**
+     * Checks if a remote operation result can be recoverable
+     * by allowing the user to state the reliability of the certificate from the server. 
+     * 
+     * @param result        Result of a remote operation.
+     * @return              An exception instance that caused the failure of the remote operation and that can be avoided if the user
+     *                      states the certificate from the server as reliable; or NULL if the result is that's not possible
+     */
+    public static boolean isRecoverable(RemoteOperationResult result) {
+        return (getRecoverableException(result) != null);
+    }
+
+}