package org.apereo.cas.web.view;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import java.util.Locale;
import java.util.stream.IntStream;
/**
* An extension of the {@link ReloadableResourceBundleMessageSource} whose sole concern
* is to print a WARN message in cases where a language key is not found in the active and
* default bundles.
*
* <p>Note: By default, if a key not found in a localized bundle, Spring will auto-fallback
* to the default bundle that is {@code messages.properties}. However, if the key is also
* not found in the default bundle, and {@link #setUseCodeAsDefaultMessage(boolean)}
* is set to true, then only the requested code itself will be used as the message to display.
* In this case, the class will issue a WARN message instructing the caller that the bundle
* needs further attention. If {@link #setUseCodeAsDefaultMessage(boolean)} is set to false,
* only then a {@code null} value will be returned, which subsequently causes an instance
* of {@link org.springframework.context.NoSuchMessageException} to be thrown.
*
* @author Misagh Moayyed
* @since 4.0.0
*/
public class CasReloadableMessageBundle extends ReloadableResourceBundleMessageSource {
private static final Logger LOGGER = LoggerFactory.getLogger(CasReloadableMessageBundle.class);
private String[] basenames;
@Override
protected String getDefaultMessage(final String code) {
final String messageToReturn = super.getDefaultMessage(code);
if (!StringUtils.isBlank(messageToReturn) && messageToReturn.equals(code)) {
LOGGER.warn("The code [{}] cannot be found in the default language bundle and will "
+ "be used as the message itself.", code);
}
return messageToReturn;
}
@Override
protected String getMessageInternal(final String code, final Object[] args, final Locale locale) {
final boolean foundCode;
if (!locale.equals(Locale.ENGLISH)) {
foundCode = IntStream.range(0, this.basenames.length).filter(i -> {
final String filename = this.basenames[i] + '_' + locale;
LOGGER.trace("Examining language bundle [{}] for the code [{}]", filename, code);
final PropertiesHolder holder = this.getProperties(filename);
return holder != null && holder.getProperties() != null
&& holder.getProperty(code) != null;
}).findFirst().isPresent();
if (!foundCode) {
LOGGER.trace("The code [{}] cannot be found in the language bundle for the locale [{}]", code, locale);
}
}
return super.getMessageInternal(code, args, locale);
}
@Override
public void setBasenames(final String... basenames) {
this.basenames = basenames;
super.setBasenames(basenames);
}
}