1 files changed, 89 insertions, 0 deletions
diff --git a/src/main/java/me/xmrvizzy/skyblocker/utils/Http.java b/src/main/java/me/xmrvizzy/skyblocker/utils/Http.java
new file mode 100644
index 00000000..3461189c
--- /dev/null
+++ b/src/main/java/me/xmrvizzy/skyblocker/utils/Http.java
@@ -0,0 +1,89 @@
+package me.xmrvizzy.skyblocker.utils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UncheckedIOException;
+import java.net.URI;
+import java.net.http.HttpClient;
+import java.net.http.HttpClient.Version;
+import java.net.http.HttpHeaders;
+import java.net.http.HttpRequest;
+import java.net.http.HttpRequest.BodyPublishers;
+import java.net.http.HttpResponse;
+import java.net.http.HttpResponse.BodyHandlers;
+import java.time.Duration;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.InflaterInputStream;
+
+import me.xmrvizzy.skyblocker.SkyblockerMod;
+import net.minecraft.SharedConstants;
+
+/**
+ * @implNote All http requests are sent using HTTP 2
+ */
+public class Http {
+	private static final String USER_AGENT = "Skyblocker/" + SkyblockerMod.VERSION + " (" + SharedConstants.getGameVersion().getName() + ")";
+	private static final HttpClient HTTP_CLIENT = HttpClient.newBuilder()
+			.connectTimeout(Duration.ofSeconds(10))
+			.build();
+	
+	public static String sendGetRequest(String url) throws IOException, InterruptedException {
+		HttpRequest request = HttpRequest.newBuilder()
+				.GET()
+				.header("Accept", "application/json")
+				.header("Accept-Encoding", "gzip, deflate")
+				.header("User-Agent", USER_AGENT)
+				.version(Version.HTTP_2)
+				.uri(URI.create(url))
+				.build();
+		
+		HttpResponse<InputStream> response = HTTP_CLIENT.send(request, BodyHandlers.ofInputStream());
+		InputStream decodedInputStream = getDecodedInputStream(response);
+		String body = new String(decodedInputStream.readAllBytes());
+		
+		return body;
+	}
+	
+	public static HttpHeaders sendHeadRequest(String url) throws IOException, InterruptedException {
+		HttpRequest request = HttpRequest.newBuilder()
+				.method("HEAD", BodyPublishers.noBody())
+				.header("User-Agent", USER_AGENT)
+				.version(Version.HTTP_2)
+				.uri(URI.create(url))
+				.build();
+		
+		HttpResponse<Void> response = HTTP_CLIENT.send(request, BodyHandlers.discarding());		
+		return response.headers();
+	}
+	
+	private static InputStream getDecodedInputStream(HttpResponse<InputStream> response) {
+		String encoding = getContentEncoding(response);
+		
+		try {
+			switch (encoding) {
+				case "":
+					return response.body();
+				case "gzip":
+					return new GZIPInputStream(response.body());
+				case "deflate":
+					return new InflaterInputStream(response.body());
+				default:
+					throw new UnsupportedOperationException("The server sent content in an unexpected encoding: " + encoding);
+			}
+		} catch (IOException e) {
+			throw new UncheckedIOException(e);
+		}
+	}
+	
+	private static String getContentEncoding(HttpResponse<InputStream> response) {
+		return response.headers().firstValue("Content-Encoding").orElse("");
+	}
+	
+	public static String getEtag(HttpHeaders headers) {
+		return headers.firstValue("Etag").orElse("");
+	}
+	
+	public static String getLastModified(HttpHeaders headers) {
+		return headers.firstValue("Last-Modified").orElse("");
+	}
+}