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file_increment_save.go
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/
file_increment_save.go
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package main
import (
"bytes"
"fmt"
"html/template"
"io"
"net/http"
"os"
)
func fileForm(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
t, _ := template.ParseFiles("file_plus.html")
t.Execute(w, nil)
} else {
mr, err := r.MultipartReader()
values := make(map[string][]string)
if err != nil {
panic("Failed to read multipart message")
}
maxValueBytes := int64(10 << 20)
for {
part, err := mr.NextPart()
if err == io.EOF {
break
}
name := part.FormName()
if name == "" {
continue
}
filename := part.FileName()
var b bytes.Buffer
if filename == "" {
n, err := io.CopyN(&b, part, maxValueBytes)
if err != nil && err != io.EOF {
fmt.Fprint(w, "Error processing form")
return
}
maxValueBytes -= n
if maxValueBytes == 0 {
fmt.Fprint(w, "multipart message too large")
return
}
values[name] = append(values[name], b.String())
continue
}
dst, err := os.Create("/tmp/dstfile." + filename)
defer dst.Close()
if err != nil {
return
}
for {
buffer := make([]byte, 100000)
cBytes, err := part.Read(buffer)
if err == io.EOF {
break
}
dst.Write(buffer[0:cBytes])
}
}
fmt.Println("Upload done")
fmt.Println(values)
fmt.Fprint(w, "Upload complete")
}
}
func main() {
http.HandleFunc("/", fileForm)
http.ListenAndServe(":8080", nil)
}