| /* |
| * 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.logging.log4j.util; |
| |
| import java.util.Map; |
| |
| /** |
| * PropertySource implementation that uses environment variables as a source. |
| * All environment variables must begin with {@code LOG4J_} so as not to |
| * conflict with other variables. Normalized environment variables follow a |
| * scheme like this: {@code log4j2.fooBarProperty} would normalize to |
| * {@code LOG4J_FOO_BAR_PROPERTY}. |
| * |
| * @since 2.10.0 |
| */ |
| public class EnvironmentPropertySource implements PropertySource { |
| |
| private static final String PREFIX = "LOG4J_"; |
| private static final int DEFAULT_PRIORITY = -100; |
| |
| @Override |
| public int getPriority() { |
| return DEFAULT_PRIORITY; |
| } |
| |
| @Override |
| public void forEach(final BiConsumer<String, String> action) { |
| final Map<String, String> getenv; |
| try { |
| getenv = System.getenv(); |
| } catch (final SecurityException e) { |
| // There is no status logger yet. |
| LowLevelLogUtil.logException( |
| "The system environment variables are not available to Log4j due to security restrictions: " + e, |
| e); |
| return; |
| } |
| for (final Map.Entry<String, String> entry : getenv.entrySet()) { |
| final String key = entry.getKey(); |
| if (key.startsWith(PREFIX)) { |
| action.accept(key.substring(PREFIX.length()), entry.getValue()); |
| } |
| } |
| } |
| |
| @Override |
| public CharSequence getNormalForm(final Iterable<? extends CharSequence> tokens) { |
| final StringBuilder sb = new StringBuilder("LOG4J"); |
| for (final CharSequence token : tokens) { |
| sb.append('_'); |
| for (int i = 0; i < token.length(); i++) { |
| sb.append(Character.toUpperCase(token.charAt(i))); |
| } |
| } |
| return sb.toString(); |
| } |
| } |