com.ryaltech.utils.spring.encryption.PropertySourceInterceptor Maven / Gradle / Ivy

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package com.ryaltech.utils.spring.encryption;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;

@Aspect
public class PropertySourceInterceptor {
	private static Log logger = LogFactory.getLog(Encryptor.class);
	private List processedNames = new ArrayList<>();
	private Encryptor encryptor;
	private FileEncryptor configFileEncryptor;
	private Pattern sourceNamePattern = Pattern.compile(".*\\[file:(.*)\\]");
	private final boolean disableFileUpdate;

	@Before("execution(org.springframework.core.env.PropertySource.new(..)) && args(name, source)")
	public void constructorAdvice(String name, Object source) {
		if (!disableFileUpdate) {
			if (!processedNames.contains(name)) {
				processedNames.add(name);
				Matcher match = sourceNamePattern.matcher(name);
				if (match.find()) {
					String fileName = match.group(1);
					configFileEncryptor.encryptConfigFile(fileName);
				}
			}
		}

	}

	@Around("execution(public * getProperty(String)) && target(org.springframework.core.env.PropertySource+)")
	public Object getPropertyAdvice(ProceedingJoinPoint pjp) throws Throwable {
		Object retVal = pjp.proceed();
		if (retVal instanceof String) {
			return encryptor.decrypt((String) retVal);
		}
		return retVal;

	}
	
	/**
	 * Checks if system key is enabled. If key is provided and not set to false(case
	 * insensitive), true is returned. If key is set to case insensitive false,
	 * false is returned. In all other cases defaultValue is returned.
	 * 
	 * @param key
	 * @param defaultValue
	 * @return
	 */
	static boolean getBooleanSystemProperty(String key, boolean defaultValue) {
		return !System.getProperty(key, Boolean.toString(defaultValue)).equalsIgnoreCase(Boolean.FALSE.toString());
	}

	public PropertySourceInterceptor() {		
		EncryptionConfig config = new EncryptionConfig();		
		disableFileUpdate = getBooleanSystemProperty("com.ryaltech.utils.spring.encryption.disableAutoEncrypt", config.isReadOnly());
		encryptor = new Encryptor(config.getKeyFile());		
		configFileEncryptor = new AllFilesEncryptor(encryptor, config.getIncludePatterns(), config.getExcludePatterns());		
	}
	

}