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package com.juick.www;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.core.io.ClassPathResource;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
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 (canPage(page) && canLang(lang)) {
try {
Path file = Paths.get(helpPath, lang, page);
String path = file.toString();
file = Paths.get(new ClassPathResource(path).getURI());
if (Files.isReadable(file))
return new String(Files.readAllBytes(file), StandardCharsets.UTF_8);
} catch (IOException e) {
}
}
return null;
}
public boolean canPage(final String anything) {
return anything != null && PAGE_PATTERN.matcher(anything).matches();
}
public boolean canLang(final String anything) {
return anything != null && LANG_PATTERN.matcher(anything).matches();
}
}
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