Add GET /biomes endpoint

README.md

@@ -20,6 +20,7 @@ The current endpoints of the interface are
 GET,PUT         /blocks     Modify blocks in the world
 POST            /command    Run Minecraft commands
 GET             /chunks     Get raw chunk nbt data
+GET             /biomes     Get biome of position in the world
 GET             /buildarea  Get the build area defined by the /setbuildarea chat command
 GET             /version    Get Minecraft version
 ```

src/main/java/com/gdmc/httpinterfacemod/GdmcHttpServer.java

@@ -32,5 +32,6 @@ private static void createContexts() {
         httpServer.createContext("/blocks", new BlocksHandler(mcServer));
         httpServer.createContext("/buildarea", new BuildAreaHandler(mcServer));
         httpServer.createContext("/version", new MinecraftVersionHandler(mcServer));
+        httpServer.createContext("/biomes", new BiomesHandler(mcServer));
     }
 }

src/main/java/com/gdmc/httpinterfacemod/handlers/BiomesHandler.java

@@ -0,0 +1,102 @@
+package com.gdmc.httpinterfacemod.handlers;
+
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+import com.sun.net.httpserver.Headers;
+import com.sun.net.httpserver.HttpExchange;
+import net.minecraft.core.BlockPos;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ServerLevel;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Map;
+
+public class BiomesHandler extends HandlerBase {
+
+	public BiomesHandler(MinecraftServer mcServer) {
+		super(mcServer);
+	}
+
+	@Override
+	protected void internalHandle(HttpExchange httpExchange) throws IOException {
+		// query parameters
+		Map<String, String> queryParams = parseQueryString(httpExchange.getRequestURI().getRawQuery());
+		int x;
+		int y;
+		int z;
+		int dx;
+		int dy;
+		int dz;
+		String dimension;
+
+		try {
+			x = Integer.parseInt(queryParams.getOrDefault("x", "0"));
+			y = Integer.parseInt(queryParams.getOrDefault("y", "0"));
+			z = Integer.parseInt(queryParams.getOrDefault("z", "0"));
+			dx = Integer.parseInt(queryParams.getOrDefault("dx", "1"));
+			dy = Integer.parseInt(queryParams.getOrDefault("dy", "1"));
+			dz = Integer.parseInt(queryParams.getOrDefault("dz", "1"));
+
+			dimension = queryParams.getOrDefault("dimension", null);
+		} catch (NumberFormatException e) {
+			String message = "Could not parse query parameter: " + e.getMessage();
+			throw new HandlerBase.HttpException(message, 400);
+		}
+
+		Headers reqestHeaders = httpExchange.getRequestHeaders();
+		String contentType = getHeader(reqestHeaders, "Accept", "*/*");
+		boolean returnJson = contentType.equals("application/json") || contentType.equals("text/json");
+
+		String method = httpExchange.getRequestMethod().toLowerCase();
+		String responseString;
+
+		if (method.equals("get")) {
+			ServerLevel serverLevel = getServerLevel(dimension);
+			if (returnJson) {
+				JsonArray jsonArray = new JsonArray();
+				for (int rangeX = x; rangeX < x + dx; rangeX++) {
+					for (int rangeY = y; rangeY < y + dy; rangeY++) {
+						for (int rangeZ = z; rangeZ < z + dz; rangeZ++) {
+							BlockPos blockPos = new BlockPos(rangeX, rangeY, rangeZ);
+							String biomeName = serverLevel.getBiome(blockPos).unwrapKey().get().location().toString();
+							JsonObject json = new JsonObject();
+							json.addProperty("id", biomeName);
+							json.addProperty("x", rangeX);
+							json.addProperty("y", rangeY);
+							json.addProperty("z", rangeZ);
+							jsonArray.add(json);
+						}
+					}
+				}
+				responseString = new Gson().toJson(jsonArray);
+			} else {
+				ArrayList<String> biomesList = new ArrayList<>();
+				for (int rangeX = x; rangeX < x + dx; rangeX++) {
+					for (int rangeY = y; rangeY < y + dy; rangeY++) {
+						for (int rangeZ = z; rangeZ < z + dz; rangeZ++) {
+							BlockPos blockPos = new BlockPos(rangeX, rangeY, rangeZ);
+							String biomeName = serverLevel.getBiome(blockPos).unwrapKey().get().location().toString();
+							biomesList.add(rangeX + " " + rangeY + " " + rangeZ + " " + biomeName);
+						}
+					}
+				}
+				responseString = String.join("\n", biomesList);
+			}
+		} else {
+			throw new HandlerBase.HttpException("Method not allowed. Only GET requests are supported.", 405);
+		}
+
+		Headers headers = httpExchange.getResponseHeaders();
+		addDefaultHeaders(headers);
+
+		if(returnJson) {
+			headers.add("Content-Type", "application/json; charset=UTF-8");
+		} else {
+			headers.add("Content-Type", "text/plain; charset=UTF-8");
+		}
+
+		resolveRequest(httpExchange, responseString);
+	}
+}