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Cette librairie permettra de faire les requetes HTTP de Fedapay dans un projet Java.

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package com.fedapay.utile;

import static java.util.Objects.requireNonNull;

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.util.regex.Pattern;

public final class StringUtils {
	private static Pattern whitespacePattern = Pattern.compile("\\s");

	/**
	 * Checks whether a string contains any whitespace characters or not.
	 *
	 * @param str the string to check.
	 * @return {@code true} if the string contains any whitespace characters;
	 *         otherwise, {@code
	 *     false}.
	 */
	public static boolean containsWhitespace(String str) {
		requireNonNull(str);
		return whitespacePattern.matcher(str).find();
	}

	/**
	 * Compares two strings for equality. The time taken is independent of the
	 * number of characters that match.
	 *
	 * @param a one of the strings to compare.
	 * @param b the other string to compare.
	 * @return true if the strings are equal, false otherwise.
	 */
	public static boolean secureCompare(String a, String b) {
		byte[] digesta = a.getBytes(StandardCharsets.UTF_8);
		byte[] digestb = b.getBytes(StandardCharsets.UTF_8);

		return MessageDigest.isEqual(digesta, digestb);
	}

	/**
	 * Converts the string to snake case.
	 *
	 * @param str the string to convert.
	 * @return A string with the contents of the input string converted to snake
	 *         case.
	 */
	public static String toSnakeCase(String str) {
		return str.replaceAll("(.)([A-Z][a-z]+)", "$1_$2").replaceAll("([a-z0-9])([A-Z])", "$1_$2").toLowerCase();
	}

}