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218 lines
5.2 KiB
218 lines
5.2 KiB
package localchat
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import (
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"encoding/json"
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"fmt"
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"godo/libs"
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"io"
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"log"
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"net"
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"net/http"
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"os"
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"path/filepath"
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"time"
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)
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const (
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fileSize = 1024 // 每个数据包的大小
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)
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type FileChunk struct {
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ChunkIndex int `json:"chunk_index"`
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Data []byte `json:"data"`
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Checksum uint32 `json:"checksum"`
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Timestamp time.Time `json:"timestamp"`
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Filename string `json:"filename"`
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}
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// HandleMessage 处理 HTTP 请求
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func HandleMessage(w http.ResponseWriter, r *http.Request) {
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var msg UdpMessage
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decoder := json.NewDecoder(r.Body)
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if err := decoder.Decode(&msg); err != nil {
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http.Error(w, "Invalid request body", http.StatusBadRequest)
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return
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}
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defer r.Body.Close()
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err := SendToIP(msg)
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if err != nil {
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http.Error(w, "Failed to send message", http.StatusInternalServerError)
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return
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}
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w.WriteHeader(http.StatusOK)
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fmt.Fprintln(w, "Text message send successfully")
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}
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func HandlerFile(w http.ResponseWriter, r *http.Request) {
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// 初始化多播地址
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var msg UdpMessage
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decoder := json.NewDecoder(r.Body)
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if err := decoder.Decode(&msg); err != nil {
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http.Error(w, "Invalid request body", http.StatusBadRequest)
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return
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}
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defer r.Body.Close()
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toIp := msg.IP
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msg.Type = "file"
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basePath, err := libs.GetOsDir()
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if err != nil {
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libs.HTTPError(w, http.StatusInternalServerError, err.Error())
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return
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}
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filePath := filepath.Join(basePath, msg.Message.(string))
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// 处理单个文件或整个文件夹
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if fileInfo, err := os.Stat(filePath); err == nil {
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if fileInfo.IsDir() {
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handleDirectory(filePath, toIp, msg)
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} else {
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handleFile(filePath, toIp, msg)
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}
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} else {
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http.Error(w, "Failed to stat path", http.StatusInternalServerError)
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return
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}
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}
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func handleFile(filePath string, toIp string, message UdpMessage) {
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// 打开文件
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file, err := os.Open(filePath)
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if err != nil {
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log.Fatalf("Failed to open file: %v", err)
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}
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defer file.Close()
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// 获取文件大小
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fileInfo, err := file.Stat()
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if err != nil {
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log.Fatalf("Failed to get file info: %v", err)
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}
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fileSize := fileInfo.Size()
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// 计算需要发送的数据包数量
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numChunks := (fileSize + fileSize - 1) / fileSize
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// 发送文件
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SendFile(file, int(numChunks), toIp, message)
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}
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func handleDirectory(dirPath string, toIp string, message UdpMessage) {
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err := filepath.Walk(dirPath, func(path string, info os.FileInfo, err error) error {
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if err != nil {
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return err
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}
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if !info.IsDir() {
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handleFile(path, toIp, message)
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}
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return nil
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})
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if err != nil {
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log.Fatalf("Failed to walk directory: %v", err)
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}
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}
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func SendFile(file *os.File, numChunks int, toIp string, message UdpMessage) {
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// 逐块读取文件并发送
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for i := 0; i < numChunks; i++ {
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var chunkData [fileSize]byte
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n, err := file.Read(chunkData[:])
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if err != nil && err != io.EOF {
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log.Fatalf("Failed to read file chunk: %v", err)
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}
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// 创建文件块
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chunk := FileChunk{
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ChunkIndex: i,
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Data: chunkData[:n],
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Checksum: calculateChecksum(chunkData[:n]),
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Timestamp: time.Now(),
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Filename: filepath.Base(file.Name()),
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}
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message.Message = chunk
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// 将文件块转换为 JSON 格式
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data, err := json.Marshal(message)
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if err != nil {
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log.Fatalf("Failed to marshal chunk: %v", err)
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}
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// 发送文件块
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addr, err := net.ResolveUDPAddr("udp4", toIp)
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if err != nil {
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log.Fatalf("Failed to resolve UDP address: %v", err)
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}
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conn, err := net.DialUDP("udp4", nil, addr)
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if err != nil {
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log.Fatalf("Failed to dial UDP address: %v", err)
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}
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defer conn.Close()
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_, err = conn.Write(data)
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if err != nil {
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log.Printf("Failed to write data: %v", err)
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}
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fmt.Printf("发送文件块 %d 到 %s 成功\n", i, toIp)
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}
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}
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func RecieveFile(msg UdpMessage) {
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chunk := msg.Message.(FileChunk)
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// 验证校验和
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calculatedChecksum := calculateChecksum(chunk.Data)
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if calculatedChecksum != chunk.Checksum {
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fmt.Printf("Checksum mismatch for chunk %d from %s\n", chunk.ChunkIndex, msg.IP)
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return
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}
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baseDir, err := libs.GetOsDir()
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if err != nil {
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log.Printf("Failed to get OS directory: %v", err)
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return
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}
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// 创建接收文件的目录
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receiveDir := filepath.Join(baseDir, "C", "Users", "Reciv", time.Now().Format("2006-01-02"))
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if !libs.PathExists(receiveDir) {
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err := os.MkdirAll(receiveDir, 0755)
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if err != nil {
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log.Printf("Failed to create receive directory: %v", err)
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return
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}
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}
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// 确定文件路径
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filePath := filepath.Join(receiveDir, chunk.Filename)
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// 如果文件不存在,则创建新文件
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if _, err := os.Stat(filePath); os.IsNotExist(err) {
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file, err := os.Create(filePath)
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if err != nil {
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log.Printf("Failed to create file: %v", err)
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return
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}
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defer file.Close()
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}
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// 打开或追加到现有文件
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file, err := os.OpenFile(filePath, os.O_APPEND|os.O_WRONLY, 0644)
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if err != nil {
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log.Printf("Failed to open file: %v", err)
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return
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}
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defer file.Close()
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// 写入数据
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_, err = file.Write(chunk.Data)
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if err != nil {
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log.Printf("Failed to write data to file: %v", err)
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return
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}
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fmt.Printf("接收到文件块 %d 从 %s 成功\n", chunk.ChunkIndex, msg.IP)
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}
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func calculateChecksum(data []byte) uint32 {
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checksum := uint32(0)
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for _, b := range data {
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checksum += uint32(b)
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}
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return checksum
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}
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