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package com.juick.www;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.cache.annotation.Cacheable;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.regex.Pattern;
/**
* Created by aalexeev on 12/11/16.
*/
public class HelpService {
private static final Pattern LANG_PATTERN = Pattern.compile("[a-z]{2}");
private static final Pattern PAGE_PATTERN = Pattern.compile("[a-zA-Z0-9\\-_]+");
private final String helpPath;
public HelpService(String helpPath) {
this.helpPath = helpPath;
}
@Cacheable("help")
public String getHelp(final String page, final String lang) {
if (canBePage(page) && canBeLang(lang)) {
String path = StringUtils.joinWith("/", helpPath, lang, page);
try (InputStream is = Thread.currentThread().getContextClassLoader().getResourceAsStream(path)) {
if (is != null)
return IOUtils.toString(is, StandardCharsets.UTF_8);
} catch (IOException e) {
}
}
return null;
}
public boolean canBePage(final String anything) {
return anything != null && PAGE_PATTERN.matcher(anything).matches();
}
public boolean canBeLang(final String anything) {
return anything != null && LANG_PATTERN.matcher(anything).matches();
}
}
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