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329 lines
8.7 KiB
329 lines
8.7 KiB
// MIT License
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//
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// Copyright (c) 2024 godoos.com
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// Email: xpbb@qq.com
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// GitHub: github.com/phpk/godoos
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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package localchat
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import (
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"encoding/base64"
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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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"sync"
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"time"
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)
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const (
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fileSize = 512 // 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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Filesize int64 `json:"filesize"`
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}
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func HandlerApplySendFile(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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hostname, err := os.Hostname()
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if err != nil {
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libs.ErrorMsg(w, "HandleMessage error")
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return
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}
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msg.Hostname = hostname
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msg.Time = time.Now()
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msg.Type = "fileSending"
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msg.Message = ""
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SendToIP(msg)
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libs.SuccessMsg(w, nil, "请求文件发送成功")
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}
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func HandlerAccessFile(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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hostname, err := os.Hostname()
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if err != nil {
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libs.ErrorMsg(w, "HandleMessage error")
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return
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}
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msg.Hostname = hostname
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msg.Time = time.Now()
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msg.Type = "fileAccessed"
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msg.Message = ""
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SendToIP(msg)
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libs.SuccessMsg(w, nil, "请求文件发送成功")
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}
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func HandlerSendFile(msg UdpMessage) {
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toIp := msg.IP
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hostname, err := os.Hostname()
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if err != nil {
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log.Printf("HandleMessage error: %v", err)
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return
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}
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msg.Hostname = hostname
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msg.Time = time.Now()
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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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log.Printf("GetOsDir error: %v", err)
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return
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}
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paths, ok := msg.Message.([]string)
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if !ok {
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log.Printf("invalid message type")
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return
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}
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for _, p := range paths {
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filePath := filepath.Join(basePath, p)
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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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continue
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}
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}
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msg.Type = "fileSended"
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msg.Message = ""
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msg.Time = time.Now()
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SendToIP(msg)
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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, fileSize, 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, fSize int64, message UdpMessage) {
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var wg sync.WaitGroup
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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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wg.Add(1)
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go func(index int) {
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defer wg.Done()
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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: index,
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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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Filesize: fSize,
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}
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message.Message = chunk
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sendData(message, toIp)
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fmt.Printf("发送文件块 %d 到 %s 成功\n", index, toIp)
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}(i)
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}
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wg.Wait()
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}
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func sendData(message UdpMessage, toIp string) {
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port := "56780"
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addr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:%s", toIp, port))
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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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data, _ := json.Marshal(message)
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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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}
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func ReceiveFile(msg UdpMessage) (string, error) {
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messageMap, ok := msg.Message.(map[string]interface{})
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if !ok {
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return "", fmt.Errorf("invalid message type: expected map[string]interface{}, got %T", msg.Message)
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}
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// 从 map 中提取 FileChunk 字段
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chunk, err := extractFileChunkFromMap(messageMap)
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if err != nil {
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return "", err
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}
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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 "", fmt.Errorf("checksum mismatch")
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// }
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// 创建接收文件的目录
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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 "", fmt.Errorf("failed to get OS directory")
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}
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resPath := filepath.Join("C", "Users", "Reciv", time.Now().Format("2006-01-02"))
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receiveDir := filepath.Join(baseDir, resPath)
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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 "", fmt.Errorf("failed to create receive directory")
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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 "", fmt.Errorf("failed to create file")
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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_CREATE|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 "", fmt.Errorf("failed to open file")
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}
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defer file.Close()
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// 写入数据
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n, 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 "", fmt.Errorf("failed to write data to file")
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}
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if n != len(chunk.Data) {
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log.Printf("Incomplete write: wrote %d bytes, expected %d bytes", n, len(chunk.Data))
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return "", fmt.Errorf("incomplete write")
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}
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fileInfo, err := os.Stat(filePath)
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if err != nil {
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log.Printf("Failed to stat file: %v", err)
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return "", fmt.Errorf("failed to stat file")
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}
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if fileInfo.Size() == chunk.Filesize {
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fmt.Println("文件接收完成且大小一致")
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return filePath, nil
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} else {
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fmt.Println("文件大小不一致")
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return "", fmt.Errorf("file size mismatch")
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}
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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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// 从 map 中提取 FileChunk 结构体
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func extractFileChunkFromMap(m map[string]interface{}) (FileChunk, error) {
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chunk := FileChunk{}
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// 从 map 中提取字段
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chunk.ChunkIndex, _ = m["chunk_index"].(int)
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dataStr, _ := m["data"].(string)
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dataBytes, err := base64.StdEncoding.DecodeString(dataStr)
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if err != nil {
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return chunk, fmt.Errorf("failed to decode data: %v", err)
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}
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chunk.Data = dataBytes
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chunk.Checksum, _ = m["checksum"].(uint32)
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timestamp, _ := m["timestamp"].(string)
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chunk.Timestamp, _ = time.Parse(time.RFC3339, timestamp)
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chunk.Filename, _ = m["filename"].(string)
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chunk.Filesize, _ = m["filesize"].(int64)
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return chunk, nil
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}
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