[GitHub] [tomcat] martin-g commented on a change in pull request #244: The '$' in the class name of Digester$EnvironmentPropertySource is no…

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martin-g commented on a change in pull request #244: The '$' in the class name of Digester$EnvironmentPropertySource is no…
URL: https://github.com/apache/tomcat/pull/244#discussion_r381961119
 
 

 ##########
 File path: java/org/apache/tomcat/util/digester/EnvironmentPropertySource.java
 ##########
 @@ -0,0 +1,76 @@
+/*
+ * 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.tomcat.util.digester;
+
+import java.security.Permission;
+
+import org.apache.tomcat.util.IntrospectionUtils;
+import org.apache.tomcat.util.security.PermissionCheck;
+
+/**
+ * A {@link org.apache.tomcat.util.IntrospectionUtils.SecurePropertySource} that uses environment variables to resolve expressions.
+ *
+ * <p><strong>Usage example:</strong></p>
+ *
+ * Configure the certificate with environment variables.
+ *
+ * <pre>
+ *   {@code
+ *     <SSLHostConfig>
+ *           <Certificate certificateKeyFile="${CERTIFICATE_KEY_FILE}"
+ *                        certificateFile="${CERTIFICATE_FILE}"
+ *                        certificateChainFile="${CERTIFICATE_CHAIN_FILE}"
+ *                        type="RSA" />
+ *     </SSLHostConfig> }
+ * </pre>
+ *
+ * How to configure:
+ * <pre>
+ * {@code
+ *   echo "org.apache.tomcat.util.digester.EnvironmentPropertySource=org.apache.tomcat.util.digester.EnvironmentPropertySource" >> conf/catalina.properties}
 
 Review comment:
   Are you sure that this is the right key ?
   Looking at org.apache.tomcat.util.digester.Digester I see:
   ```
   String className = System.getProperty("org.apache.tomcat.util.digester.PROPERTY_SOURCE");
   ```

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