archived-hifumi/src/main/java/io/github/redpanda4552/HifumiBot/util/Strings.java

/**
 * This file is part of HifumiBot, licensed under the MIT License (MIT)
 * 
 * Copyright (c) 2020 RedPanda4552 (https://github.com/RedPanda4552)
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package io.github.redpanda4552.HifumiBot.util;

import java.util.ArrayList;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Strings {

    private static final Pattern URL_PATTERN = Pattern.compile("((?:https?|ftp|file)://[-a-zA-Z0-9+&@#/%?=~_|!:,.;]*[-a-zA-Z0-9+&@#/%=~_|])");

    public static String unescapeNewlines(String input) {
        return input.replace("\\n", "\n");
    }

    public static ArrayList<String> extractUrls(String input) {
        ArrayList<String> urls = new ArrayList<String>();
        Matcher m = URL_PATTERN.matcher(input);
        
        while (m.find()) {
            String url = m.group();

            if (url != null) {
                urls.add(url);
            }
        }

        return urls;
    }

    public static String getEnvVarOrPanic(String envVar) {
        var value = System.getenv().getOrDefault(envVar, null);
        if (value == null) {
            throw new RuntimeException(String.format("Did not provide env-var: '%s'", envVar));
        }
        return value;
    }
}