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package utils;

import java.util.LinkedHashMap;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang3.StringUtils;

public class MessageUtils {
    private static LinkedHashMap tokens = null;
    private static Pattern pattern = null;

    private static void init() {
        if (tokens != null) {
            return;
        }
        tokens = new LinkedHashMap<>();
        tokens.put("&", "&");
        tokens.put("<", "<");
        tokens.put(">", ">");
        tokens.put("'", "'");
        tokens.put("\"", """);
        tokens.put("\\$", "$");
        tokens.put("#", "#");
        tokens.put("\\(", "(");
        tokens.put("\\)", ")");
        tokens.put("=", "=");
        tokens.put(";", ";");
        tokens.put("\\\\", "\");
        tokens.put("\\.", ".");
        tokens.put("`", "`");
        tokens.put("%", "%");
        tokens.put("\\*", "*");
        tokens.put("\\[", "[");
        tokens.put("\\]", "]");
        tokens.put("\\{", "{");
        tokens.put("\\}", "}");

        pattern = Pattern.compile("(" + StringUtils.join(tokens.keySet(), "|") + ")");
    }

    public static String escapeText(String rawText) {
        init();

        Matcher matcher = pattern.matcher(rawText);
        StringBuffer buffer = new StringBuffer();
        while (matcher.find()) {
            String group = matcher.group(1);
            String replacement = tokens.get(group);
            if (replacement == null) {
                replacement = tokens.get("\\" + group);
            }
            matcher.appendReplacement(buffer, replacement);
        }
        matcher.appendTail(buffer);

        return buffer.toString();
    }

    public static String escapeStreamId(String rawStreamId) {
        return rawStreamId.trim()
            .replaceAll("[=]+$", "")
            .replaceAll("\\+", "-")
            .replaceAll("/", "_");
    }
}