GUACAMOLE-362: Move PrivateKeyGuacamoleProperty into CAS extension and use ByteArrayOutputStream for reading thefile.

extensions/guacamole-auth-cas/src/main/java/org/apache/guacamole/auth/cas/conf/CASGuacamoleProperties.java

@@ -19,7 +19,6 @@
 
 package org.apache.guacamole.auth.cas.conf;
 
-import org.apache.guacamole.properties.PrivateKeyGuacamoleProperty;
 import org.apache.guacamole.properties.StringGuacamoleProperty;
 
 /**

extensions/guacamole-auth-cas/src/main/java/org/apache/guacamole/auth/cas/conf/PrivateKeyGuacamoleProperty.java

@@ -0,0 +1,90 @@
+/*
+ * 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.auth.cas.conf;
+
+import java.io.ByteArrayOutputStream;
+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.properties.GuacamoleProperty;
+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);
+            FileInputStream keyStreamIn = new FileInputStream(keyFile);
+            ByteArrayOutputStream keyStreamOut = new ByteArrayOutputStream();
+            byte[] keyBuffer = new byte[1024];
+            try {
+                for (int readBytes; (readBytes = keyStreamIn.read(keyBuffer)) != -1;)
+                    keyStreamOut.write(keyBuffer, 0, readBytes);
+            }
+            catch (IOException e) {
+                throw new GuacamoleServerException("IOException while trying to read bytes from file.", e);
+            }
+
+            final byte[] keyBytes = keyStreamOut.toByteArray();
+
+            // Set up decryption infrastructure
+            KeyFactory keyFactory = KeyFactory.getInstance("RSA");
+            KeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
+            return keyFactory.generatePrivate(keySpec);
+
+        }
+        catch (FileNotFoundException e) {
+            throw new GuacamoleServerException("Could not find the specified key file.", e);
+        }
+        catch (IOException e) {
+            throw new GuacamoleServerException("Could not read in the specified key file.", e);
+        }
+        catch (NoSuchAlgorithmException e) {
+            throw new GuacamoleServerException("RSA algorithm is not available.", e);
+        }
+        catch (InvalidKeySpecException e) {
+            throw new GuacamoleServerException("Key is not in expected PKCS8 encoding.", e);
+        }
+
+    }
+
+}