add RequestFunctions class

src/main/java/io/github/jack1424/realtimeweather/requests/RequestFunctions.java

@@ -0,0 +1,45 @@
+package io.github.jack1424.realtimeweather.requests;
+
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.URL;
+import java.util.Scanner;
+
+public class RequestFunctions {
+	public static Object makeRequest(String URLString) throws IOException, HTTPResponseException, ParseException {
+		int responseCode = getResponseCode(URLString);
+		if (responseCode > 399)
+			throw new HTTPResponseException(responseCode);
+
+		Scanner scanner = new Scanner(new URL(URLString).openStream());
+		StringBuilder response = new StringBuilder();
+		while (scanner.hasNextLine())
+			response.append(scanner.nextLine());
+		scanner.close();
+
+		return new JSONParser().parse(response.toString());
+	}
+
+	public static int getResponseCode(String URLString) throws IOException {
+		URL url = new URL(URLString);
+		HttpURLConnection con = (HttpURLConnection) url.openConnection();
+		con.setRequestMethod("GET");
+		con.connect();
+		return con.getResponseCode();
+	}
+
+	public static String getLatestVersion() throws Exception {
+		return ((JSONObject) ((JSONArray) makeRequest("https://api.modrinth.com/v2/project/WRA6ODcm/version")).get(0)).get("version_number").toString();
+	}
+
+	public static class HTTPResponseException extends Exception {
+		public HTTPResponseException(int responseCode) {
+			super(String.valueOf(responseCode));
+		}
+	}
+}