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// MIT License
//
// Copyright (c) 2024 godoos.com
// Email: xpbb@qq.com
// GitHub: github.com/phpk/godoos
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package localchat
import (
"bytes"
"encoding/json"
"fmt"
"godo/libs"
"image"
"io"
"log"
"net"
"net/http"
"os"
"path/filepath"
"time"
)
func HandlerSendImg(w http.ResponseWriter, r *http.Request) {
var msg UdpMessage
decoder := json.NewDecoder(r.Body)
if err := decoder.Decode(&msg); err != nil {
http.Error(w, "Invalid request body", http.StatusBadRequest)
return
}
defer r.Body.Close()
hostname, err := os.Hostname()
if err != nil {
libs.ErrorMsg(w, "HandleMessage error")
return
}
msg.Hostname = hostname
msg.Time = time.Now()
msg.Type = "image"
toIp := msg.IP
basePath, err := libs.GetOsDir()
if err != nil {
log.Printf("GetOsDir error: %v", err)
return
}
paths, ok := msg.Message.([]string)
if !ok {
log.Printf("invalid message type")
return
}
for _, p := range paths {
filePath := filepath.Join(basePath, p)
// 处理多张图片
if fileInfo, err := os.Stat(filePath); err == nil {
if !fileInfo.IsDir() {
if isImage(filePath) { // 检查是否为图片
sendImage(filePath, toIp, msg)
} else {
log.Printf("文件 %s 不是图片", filePath)
}
}
} else {
continue
}
}
libs.SuccessMsg(w, nil, "图片发送成功")
}
func isImage(filePath string) bool {
data, err := os.ReadFile(filePath)
if err != nil {
return false
}
img, _, err := image.DecodeConfig(bytes.NewReader(data))
return err == nil && img.Width > 0 && img.Height > 0
}
func sendImage(filePath string, toIp string, message UdpMessage) {
// 打开文件
file, err := os.Open(filePath)
if err != nil {
log.Fatalf("Failed to open file: %v", err)
}
defer file.Close()
// 获取文件大小
fileInfo, err := file.Stat()
if err != nil {
log.Fatalf("Failed to get file info: %v", err)
}
fileSize := fileInfo.Size()
// 读取整个文件
data := make([]byte, fileSize)
_, err = file.Read(data)
if err != nil {
log.Fatalf("Failed to read file: %v", err)
}
// 创建文件块
chunk := FileChunk{
Data: data,
Checksum: calculateChecksum(data),
Timestamp: time.Now(),
Filename: filepath.Base(file.Name()),
}
message.Message = chunk
// 将文件块转换为 JSON 格式
data, err = json.Marshal(message)
if err != nil {
log.Fatalf("Failed to marshal chunk: %v", err)
}
// 发送文件块
port := "56780"
addr, err := net.ResolveUDPAddr("udp4", fmt.Sprintf("%s:%s", toIp, port))
if err != nil {
log.Fatalf("Failed to resolve UDP address: %v", err)
}
conn, err := net.DialUDP("udp4", nil, addr)
if err != nil {
log.Fatalf("Failed to dial UDP address: %v", err)
}
defer conn.Close()
_, err = conn.Write(data)
if err != nil {
log.Printf("Failed to write data: %v", err)
}
fmt.Printf("发送图片 %s 到 %s 成功\n", filePath, toIp)
}
func ReceiveImg(msg UdpMessage) (string, error) {
chunk := msg.Message.(FileChunk)
// 验证校验和
calculatedChecksum := calculateChecksum(chunk.Data)
if calculatedChecksum != chunk.Checksum {
fmt.Printf("Checksum mismatch for image from %s\n", msg.IP)
return "", fmt.Errorf("checksum mismatch")
}
baseDir, err := libs.GetOsDir()
if err != nil {
log.Printf("Failed to get OS directory: %v", err)
return "", err
}
// 创建接收文件的目录
resPath := filepath.Join("C", "Users", "Reciv", time.Now().Format("2006-01-02"))
receiveDir := filepath.Join(baseDir, resPath)
if !libs.PathExists(receiveDir) {
err := os.MkdirAll(receiveDir, 0755)
if err != nil {
log.Printf("Failed to create receive directory: %v", err)
return "", err
}
}
// 确定文件路径
filePath := filepath.Join(receiveDir, chunk.Filename)
// 如果文件不存在,则创建新文件
if _, err := os.Stat(filePath); os.IsNotExist(err) {
file, err := os.Create(filePath)
if err != nil {
log.Printf("Failed to create file: %v", err)
return "", err
}
defer file.Close()
}
// 打开或追加到现有文件
file, err := os.OpenFile(filePath, os.O_TRUNC|os.O_CREATE|os.O_WRONLY, 0644)
if err != nil {
log.Printf("Failed to open file: %v", err)
return "", err
}
defer file.Close()
// 写入数据
_, err = file.Write(chunk.Data)
if err != nil {
log.Printf("Failed to write data to file: %v", err)
return "", err
}
fmt.Printf("接收到图片 %s 从 %s 成功\n", filePath, msg.IP)
resFilePath := filepath.Join(resPath, chunk.Filename)
return resFilePath, nil
}
func HandleViewImg(w http.ResponseWriter, r *http.Request) {
img := r.URL.Query().Get("img")
if img == "" {
libs.ErrorMsg(w, "img is empty")
return
}
basePath, err := libs.GetOsDir()
if err != nil {
log.Printf("GetOsDir error: %v", err)
return
}
filePath := filepath.Join(basePath, img)
// 检查文件是否存在
if _, err := os.Stat(filePath); os.IsNotExist(err) {
http.NotFound(w, r)
return
}
// 设置正确的 MIME 类型
mimeType, err := GetMimeType(filePath)
if err != nil {
http.Error(w, "Failed to determine MIME type", http.StatusInternalServerError)
return
}
// 设置响应头
w.Header().Set("Content-Type", mimeType)
// 读取文件并写入响应体
file, err := os.Open(filePath)
if err != nil {
http.Error(w, "Failed to open file", http.StatusInternalServerError)
return
}
defer file.Close()
_, err = io.Copy(w, file)
if err != nil {
http.Error(w, "Failed to write file content", http.StatusInternalServerError)
return
}
}
func GetMimeType(filePath string) (string, error) {
f, err := os.Open(filePath)
if err != nil {
return "", err
}
defer f.Close()
// 读取前 512 字节以确定 MIME 类型
buffer := make([]byte, 512)
_, err = f.Read(buffer)
if err != nil {
return "", err
}
mimeType := http.DetectContentType(buffer)
return mimeType, nil
}