Base api works

src/main/java/tk/draganczuk/url/App.java

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+package tk.draganczuk.url;
+
+import static spark.Spark.*;
+
+public class App {
+
+    public static void main(String[] args) {
+		get("/all", Routes::getAll);
+		post("/new", Routes::addUrl);
+		get("/:shortUrl", Routes::goToLongUrl);
+    }
+}

src/main/java/tk/draganczuk/url/Pair.java

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+package tk.draganczuk.url;
+
+/**
+* Pair
+*/
+public class Pair<T, U> {
+
+	private T left;
+	private U right;
+
+
+	public Pair(T left, U right) {
+		this.left = left;
+		this.right = right;
+	}
+
+	public static <T, U> Pair<T, U> of(T left, U right){
+		return new Pair<T,U>(left, right);
+	}
+
+	public T getLeft() {
+		return left;
+	}
+
+	public void setLeft(T left) {
+		this.left = left;
+	}
+
+	public U getRight() {
+		return right;
+	}
+
+	public void setRight(U right) {
+		this.right = right;
+	}
+}

src/main/java/tk/draganczuk/url/Routes.java

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+package tk.draganczuk.url;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.UUID;
+
+import org.eclipse.jetty.util.log.Log;
+
+import spark.Request;
+import spark.Response;
+
+public class Routes {
+
+	private static UrlFile urlFile;
+
+	static{
+		try {
+			urlFile = new UrlFile();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	public static List<String> getAll(Request req, Response res) throws IOException{
+		return urlFile.getAll();
+	}
+
+	public static String addUrl(Request req, Response res) {
+		String longUrl = req.queryParams("long");
+		String shortUrl = req.queryParams("short");
+
+ 		if (shortUrl == null) {
+ 			shortUrl = Utils.randomString();
+ 		}
+
+		return urlFile.addUrl(longUrl, shortUrl);
+	}
+
+	public static String goToLongUrl(Request req, Response res){
+		String shortUrl = req.params("shortUrl");
+		var longUrlOpt = urlFile
+			.findForShortUrl(shortUrl);
+
+		if(longUrlOpt.isEmpty()){
+			res.status(404);
+			return "";
+		}
+
+		res.redirect(longUrlOpt.get());
+
+		return "";
+	}
+
+}

src/main/java/tk/draganczuk/url/UrlFile.java

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+package tk.draganczuk.url;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.StandardOpenOption;
+import java.util.List;
+import java.util.Optional;
+
+import org.eclipse.jetty.util.log.Log;
+
+
+public class UrlFile {
+
+	private File file;
+
+	public UrlFile() throws IOException{
+		String path = System.getProperty("file.location", "./urls.csv");
+		this.file = new File(path);
+		if(! file.exists()){
+			file.createNewFile();
+		}
+	}
+
+	public List<String> getAll() throws IOException{
+		return Files.readAllLines(file.toPath());
+	}
+
+	public String addUrl(String longURL, String shortUrl){
+		String entry = String.format("%s,%s",shortUrl,longURL);
+		try {
+			var lineOpt = Files.lines(file.toPath())
+				.filter(line -> line.equals(entry))
+				.findAny();
+			if(lineOpt.isEmpty()){
+				Files.writeString(file.toPath(), entry + System.lineSeparator(), StandardOpenOption.APPEND);
+			}
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+		return entry;
+	}
+
+	public Optional<String> findForShortUrl(String shortUrl){
+		try {
+			return  Files.lines(file.toPath())
+				.map(this::splitLine)
+				.filter(pair -> pair.getLeft().equals(shortUrl))
+				.map(Pair::getRight)
+				.findAny();
+		} catch (IOException e) {
+			return Optional.empty();
+		}
+	}
+
+	public Pair<String, String> splitLine(String line){
+		var split = line.split(",");
+		return new Pair<>(split[0], split[1]);
+	}
+}

src/main/java/tk/draganczuk/url/Utils.java

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+package tk.draganczuk.url;
+
+import java.util.Random;
+
+public class Utils {
+	private static final Random random = new Random(System.currentTimeMillis());
+
+	public static String randomString() {
+		int leftLimit = 48; // numeral '0'
+		int rightLimit = 122; // letter 'z'
+		int targetStringLength = 10;
+
+		String generatedString = random.ints(leftLimit, rightLimit + 1)
+				.filter(i -> (i <= 57 || i >= 65) && (i <= 90 || i >= 97))
+				.limit(targetStringLength)
+				.collect(StringBuilder::new,
+						StringBuilder::appendCodePoint,
+						StringBuilder::append)
+				.toString();
+
+		return generatedString;
+	}
+}