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Merged
Sukikui merged 2 commits into from
Aug 26, 2025
Merged

Add Access-Control-Allow-Origin #5

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a59fd88
feat: add Access-Control-Allow-Origin
Sukikui Aug 26, 2025
1cc0253
docs: add CORS specifications in the README
Sukikui Aug 26, 2025
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5 changes: 3 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -69,6 +69,7 @@ For security reasons, the API server:
- Only accepts connections from localhost `127.0.0.1`
- Runs on port `25565` by default
- Provides read-only access to player position data
- Allows requests from any origin (CORS `Access-Control-Allow-Origin: *`) for easy integration with web applications

## 🛠️ Examples

Expand All @@ -89,8 +90,8 @@ print(f"Player {data['username']} (UUID: {data['uuid']}) at X: {data['x']}, Y: {
### JavaScript
```javascript
fetch("http://localhost:25565/api/coords")
.then(response => response.json())
.then(data => console.log(`Player ${data.username} (UUID: ${data.uuid}) at X: ${data.x}, Y: ${data.y}, Z: ${data.z}`));
.then(response => response.json())
.then(data => console.log(`Player ${data.username} (UUID: ${data.uuid}) at X: ${data.x}, Y: ${data.y}, Z: ${data.z}`));
```

<div align="center">
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237 changes: 126 additions & 111 deletions src/client/java/fr/sukikui/playercoordsapi/PlayerCoordsAPIClient.java
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Original file line number Diff line number Diff line change
Expand Up @@ -15,115 +15,130 @@
import java.util.concurrent.Executors;

public class PlayerCoordsAPIClient implements ClientModInitializer {
private HttpServer server;
private boolean serverStarted = false;
// Hardcoded port value - no longer in config
private static final int PORT = 25565;

@Override
public void onInitializeClient() {
// Start server on init if enabled
if (PlayerCoordsAPI.getConfig().enabled) {
startServer();
}

// Register tick event to constantly check config status
ClientTickEvents.END_CLIENT_TICK.register(client -> {
boolean configEnabled = PlayerCoordsAPI.getConfig().enabled;

// If enabled and server not started, start server
if (configEnabled && !serverStarted) {
startServer();
}

// If disabled and server is running, stop server
if (!configEnabled && serverStarted) {
stopServer();
}
});

PlayerCoordsAPI.LOGGER.info("Registered config monitor");
}

private void startServer() {
if (serverStarted) return;

try {
PlayerCoordsAPI.LOGGER.info("Starting PlayerCoordsAPI HTTP server on port " + PORT);
server = HttpServer.create(new InetSocketAddress(PORT), 0);
server.createContext("/api/coords", this::handleCoordsRequest);
server.setExecutor(Executors.newSingleThreadExecutor());
server.start();
serverStarted = true;
PlayerCoordsAPI.LOGGER.info("PlayerCoordsAPI HTTP server started successfully");
} catch (IOException e) {
PlayerCoordsAPI.LOGGER.error("Failed to start PlayerCoordsAPI HTTP server", e);
}
}

private void stopServer() {
if (server != null) {
PlayerCoordsAPI.LOGGER.info("Stopping PlayerCoordsAPI HTTP server");

// Create a separate thread to stop the server to prevent blocking
final HttpServer serverToStop = server; // Create a final reference for the thread
Thread stopThread = new Thread(() -> {
serverToStop.stop(0); // Stop with no delay
PlayerCoordsAPI.LOGGER.info("PlayerCoordsAPI HTTP server stopped successfully");
});
stopThread.setDaemon(true);
stopThread.start();

// Set variables immediately so we know the server is being stopped
server = null;
serverStarted = false;
}
}

private void handleCoordsRequest(HttpExchange exchange) throws IOException {
// Check if the client is allowed to access (only localhost)
String remoteAddress = exchange.getRemoteAddress().getAddress().getHostAddress();
if (!remoteAddress.equals("127.0.0.1") && !remoteAddress.equals("0:0:0:0:0:0:0:1")) {
sendResponse(exchange, 403, "{\"error\": \"Access denied\"}");
return;
}

// Get player coordinates
MinecraftClient client = MinecraftClient.getInstance();
PlayerEntity player = client.player;

String responseText;
if (player != null) {
double x = player.getX();
double y = player.getY();
double z = player.getZ();
String world = player.getWorld().getRegistryKey().getValue().toString();

// Get biome information
RegistryEntry<Biome> biomeEntry = player.getWorld().getBiome(player.getBlockPos());
String biome = biomeEntry.getKey().orElseThrow().getValue().toString();

// Get player UUID and username
String uuid = player.getUuid().toString();
String username = player.getName().getString();

// Format as JSON
responseText = String.format(
"{\"x\": %.2f, \"y\": %.2f, \"z\": %.2f, \"world\": \"%s\", \"biome\": \"%s\", \"uuid\": \"%s\", \"username\": \"%s\"}",
x, y, z, world, biome, uuid, username
);
sendResponse(exchange, 200, responseText);
} else {
sendResponse(exchange, 404, "{\"error\": \"Player not in world\"}");
}
}

private void sendResponse(HttpExchange exchange, int statusCode, String response) throws IOException {
exchange.getResponseHeaders().set("Content-Type", "application/json");
exchange.sendResponseHeaders(statusCode, response.length());

try (OutputStream os = exchange.getResponseBody()) {
os.write(response.getBytes());
}
}
private HttpServer server;
private boolean serverStarted = false;
// Hardcoded port value - no longer in config
private static final int PORT = 25565;

@Override
public void onInitializeClient() {
// Start server on init if enabled
if (PlayerCoordsAPI.getConfig().enabled) {
startServer();
}

// Register tick event to constantly check config status
ClientTickEvents.END_CLIENT_TICK.register(client -> {
boolean configEnabled = PlayerCoordsAPI.getConfig().enabled;

// If enabled and server not started, start server
if (configEnabled && !serverStarted) {
startServer();
}

// If disabled and server is running, stop server
if (!configEnabled && serverStarted) {
stopServer();
}
});

PlayerCoordsAPI.LOGGER.info("Registered config monitor");
}

private void startServer() {
if (serverStarted) return;

try {
PlayerCoordsAPI.LOGGER.info("Starting PlayerCoordsAPI HTTP server on port " + PORT);
server = HttpServer.create(new InetSocketAddress(PORT), 0);
server.createContext("/api/coords", this::handleCoordsRequest);
server.setExecutor(Executors.newSingleThreadExecutor());
server.start();
serverStarted = true;
PlayerCoordsAPI.LOGGER.info("PlayerCoordsAPI HTTP server started successfully");
} catch (IOException e) {
PlayerCoordsAPI.LOGGER.error("Failed to start PlayerCoordsAPI HTTP server", e);
}
}

private void stopServer() {
if (server != null) {
PlayerCoordsAPI.LOGGER.info("Stopping PlayerCoordsAPI HTTP server");

// Create a separate thread to stop the server to prevent blocking
final HttpServer serverToStop = server; // Create a final reference for the thread
Thread stopThread = new Thread(() -> {
serverToStop.stop(0); // Stop with no delay
PlayerCoordsAPI.LOGGER.info("PlayerCoordsAPI HTTP server stopped successfully");
});
stopThread.setDaemon(true);
stopThread.start();

// Set variables immediately so we know the server is being stopped
server = null;
serverStarted = false;
}
}

private void handleCoordsRequest(HttpExchange exchange) throws IOException {
// Handle CORS preflight request
if (exchange.getRequestMethod().equalsIgnoreCase("OPTIONS")) {
sendResponse(exchange, 204, null);
return;
}

// Check if the client is allowed to access (only localhost)
String remoteAddress = exchange.getRemoteAddress().getAddress().getHostAddress();
if (!remoteAddress.equals("127.0.0.1") && !remoteAddress.equals("0:0:0:0:0:0:0:1")) {
sendResponse(exchange, 403, "{\"error\": \"Access denied\"}");
return;
}

// Get player coordinates
MinecraftClient client = MinecraftClient.getInstance();
PlayerEntity player = client.player;

String responseText;
if (player != null) {
double x = player.getX();
double y = player.getY();
double z = player.getZ();
String world = player.getWorld().getRegistryKey().getValue().toString();

// Get biome information
RegistryEntry<Biome> biomeEntry = player.getWorld().getBiome(player.getBlockPos());
String biome = biomeEntry.getKey().orElseThrow().getValue().toString();

// Get player UUID and username
String uuid = player.getUuid().toString();
String username = player.getName().getString();

// Format as JSON
responseText = String.format(
"{\"x\": %.2f, \"y\": %.2f, \"z\": %.2f, \"world\": \"%s\", \"biome\": \"%s\", \"uuid\": \"%s\", \"username\": \"%s\"}",
x, y, z, world, biome, uuid, username
);
sendResponse(exchange, 200, responseText);
} else {
sendResponse(exchange, 404, "{\"error\": \"Player not in world\"}");
}
}

private void sendResponse(HttpExchange exchange, int statusCode, String response) throws IOException {
// Add CORS headers
exchange.getResponseHeaders().set("Access-Control-Allow-Origin", "*");
exchange.getResponseHeaders().set("Access-Control-Allow-Methods", "GET, OPTIONS");
exchange.getResponseHeaders().set("Access-Control-Allow-Headers", "Content-Type, Authorization");

// Set content type if response is not null
if (response != null) {
exchange.getResponseHeaders().set("Content-Type", "application/json");
exchange.sendResponseHeaders(statusCode, response.length());
try (OutputStream os = exchange.getResponseBody()) {
os.write(response.getBytes());
}
} else {
exchange.sendResponseHeaders(statusCode, -1); // No response body
}
}
}
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