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Provides JSON Web Token handling for Atlassian Connect for Spring Boot

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package com.atlassian.connect.spring.internal.jwt;

import org.springframework.core.style.ToStringCreator;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

import java.util.Arrays;
import java.util.Iterator;
import java.util.Map;
import java.util.Optional;

public class CanonicalRequestUtil {

    private CanonicalRequestUtil() {
        throw new IllegalStateException("Utility class");
    }

    public static String getRelativePath(String requestPath, String contextPath) {
        String contextPathToRemove = null == contextPath || "/".equals(contextPath) ? "" : contextPath;
        return Optional.ofNullable(requestPath)
                .filter(s -> !ObjectUtils.isEmpty(s))
                .map(s -> s.startsWith(contextPathToRemove) ? s.substring(contextPathToRemove.length()) : s)
                .map(s -> StringUtils.trimTrailingCharacter(s, '/'))
                .orElse("/");
    }

    // So we can share between different impls.
    // Likely too large to be a useful toString
    public static String toVerboseString(CanonicalHttpRequest request) {
        return new ToStringCreator(request)
                .append("method", request.getMethod())
                .append("relativePath", request.getRelativePath())
                .append("parameterMap", mapToString(request.getParameterMap()))
                .toString();
    }

    private static String mapToString(Map parameterMap) {
        StringBuilder sb = new StringBuilder()
                .append('[');

        for (Map.Entry entry : parameterMap.entrySet()) {
            sb.append(entry.getKey()).append(" -> ");
            String[] value = entry.getValue();
            if (value != null) {
                sb.append("(");
                appendTo(sb, Arrays.asList(value), ",");
                sb.append(")");
            }
            sb.append(','); // I know being lazy
        }

        return sb.append(']')
                .toString();
    }

    // borrowed from guava Join so can avoid guava dependency and OSGI fun
    private static StringBuilder appendTo(StringBuilder appendable, Iterable parts, CharSequence separator) {
        Iterator iterator = parts.iterator();
        if (iterator.hasNext()) {
            appendable.append(toString(iterator.next()));
            while (iterator.hasNext()) {
                appendable.append(separator);
                appendable.append(toString(iterator.next()));
            }
        }
        return appendable;
    }

    private static CharSequence toString(Object part) {
        if (part == null) {
            return "";
        }
        if (part instanceof CharSequence charSequence) {
            return charSequence;
        }
        return part.toString();
    }
}