src/main/java/com/pt/controller/TrackerController.java

package com.pt.controller;

import com.pt.service.TrackerService;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

@RestController
@RequestMapping("/api/tracker")
@CrossOrigin(origins = "*")
public class TrackerController {

    @Autowired
    private TrackerService trackerService;

    // tracker相应bt客户端的announce请求
    @PostMapping("/announce")
    public void announceByPost(
            @RequestParam("info_hash") String infoHash,
            @RequestParam("peer_id") String peerId,
            @RequestParam("port") int port,
            HttpServletRequest request,
            HttpServletResponse response
    ) throws IOException {
        try {
            String ip = request.getRemoteAddr();

            // 将参数封装为 Map 传给服务层（也可以直接传对象）
            Map<String, String[]> params = new HashMap<>();
            params.put("info_hash", new String[]{infoHash});
            params.put("peer_id", new String[]{peerId});
            params.put("port", new String[]{String.valueOf(port)});
            byte[] bencodedResponse = trackerService.handleAnnounce(params, ip);

            response.setContentType("application/x-bittorrent");
            response.getOutputStream().write(bencodedResponse);
        } catch (Exception e) {
            response.setStatus(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
            response.setContentType("text/plain");
            response.getWriter().write("Tracker internal error: " + e.getMessage());
        }
    }

}