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/*
* SonarScanner CLI
* Copyright (C) 2011-2024 SonarSource SA
* mailto:info AT sonarsource DOT com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
package org.sonarsource.scanner.cli;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class PropertyResolver {
private static final Pattern placeholderPattern = Pattern.compile("\\$\\{([\\w\\.]+)\\}");
private final Properties props;
private final Properties resolved;
private final List<String> queue;
private final Map<String, String> env;
public PropertyResolver(Properties props, Map<String, String> env) {
this.props = props;
this.env = env;
this.resolved = new Properties();
this.queue = new LinkedList<>();
}
public Properties resolve() {
for (Map.Entry<Object, Object> e : props.entrySet()) {
if (resolved.containsKey(e.getKey())) {
continue;
}
resolveProperty((String) e.getKey());
}
return resolved;
}
private String getValue(String key) {
String propValue;
if (key.startsWith("env.")) {
String envKey = key.substring(4);
propValue = env.get(envKey);
} else {
propValue = props.getProperty(key);
}
return propValue != null ? propValue : "";
}
private String resolveProperty(String propKey) {
String propValue = getValue(propKey);
if (propValue.isEmpty()) {
resolved.setProperty(propKey, propValue);
return propValue;
}
Matcher m = placeholderPattern.matcher(propValue);
var sb = new StringBuilder();
while (m.find()) {
String varName = (null == m.group(1)) ? m.group(2) : m.group(1);
if (queue.contains(varName)) {
throw new IllegalArgumentException("Found a loop resolving place holders in properties, for variable: " + varName);
}
String placeholderValue = resolveVar(varName);
m.appendReplacement(sb, Matcher.quoteReplacement(placeholderValue));
}
m.appendTail(sb);
String resolvedPropValue = sb.toString();
resolved.setProperty(propKey, resolvedPropValue);
return resolvedPropValue;
}
private String resolveVar(String varName) {
String placeholderValue;
if (resolved.containsKey(varName)) {
placeholderValue = resolved.getProperty(varName);
} else {
queue.add(varName);
placeholderValue = resolveProperty(varName);
queue.remove(varName);
}
return placeholderValue;
}
}
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