Github user mike-jumper commented on a diff in the pull request:
https://github.com/apache/incubator-guacamole-client/pull/183#discussion_r143890893
--- Diff:
guacamole-ext/src/main/java/org/apache/guacamole/properties/PrivateKeyGuacamoleProperty.java
---
@@ -0,0 +1,95 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you 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 org.apache.guacamole.properties;
+
+import java.io.BufferedInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.InputStream;
+import java.io.IOException;
+import java.lang.IllegalArgumentException;
+import java.security.InvalidKeyException;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.KeySpec;
+import java.security.spec.PKCS8EncodedKeySpec;
+import org.apache.guacamole.GuacamoleServerException;
+import org.apache.guacamole.environment.Environment;
+import org.apache.guacamole.environment.LocalEnvironment;
+
+/**
+ * A GuacamoleProperty whose value is derived from a private key file.
+ */
+public abstract class PrivateKeyGuacamoleProperty implements
GuacamoleProperty<PrivateKey> {
+
+ @Override
+ public PrivateKey parseValue(String value) throws
GuacamoleServerException {
+
+ if (value == null || value.isEmpty())
+ return null;
+
+ try {
+
+ // Open and read the file specified in the configuration.
+ File keyFile = new File(value);
+ InputStream keyInput = new BufferedInputStream(new
FileInputStream(keyFile));
+ int keyLength = (int) keyFile.length();
+ final byte[] keyBytes = new byte[keyLength];
+ int keyRead = keyInput.read(keyBytes);
+
+ // Error reading any bytes out of the key.
+ if (keyRead == -1)
+ throw new GuacamoleServerException("Failed to get any
bytes while reading key.");
+
+ // Zero-sized key
+ else if(keyRead == 0)
--- End diff --
A `read()` of 0 does not indicate that there are zero bytes in the file,
nor any error condition. It simply means that `read()` read nothing, and should
be invoked again.
---
