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rui/downloadFile.go

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package rui
import (
"bytes"
"math/rand"
"net/http"
"os"
"path/filepath"
"strconv"
"time"
)
type downloadFile struct {
filename string
path string
data []byte
}
var currentDownloadId = int(rand.Int31())
var downloadFiles = map[string]downloadFile{}
func (session *sessionData) startDownload(file downloadFile) {
currentDownloadId++
id := strconv.Itoa(currentDownloadId)
downloadFiles[id] = file
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session.callFunc("startDownload", id, file.filename)
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}
func serveDownloadFile(id string, w http.ResponseWriter, r *http.Request) bool {
if file, ok := downloadFiles[id]; ok {
delete(downloadFiles, id)
if file.data != nil {
http.ServeContent(w, r, file.filename, time.Now(), bytes.NewReader(file.data))
return true
} else if _, err := os.Stat(file.path); err == nil {
http.ServeFile(w, r, file.path)
return true
}
}
return false
}
// DownloadFile starts downloading the file on the client side.
func (session *sessionData) DownloadFile(path string) {
if _, err := os.Stat(path); err != nil {
ErrorLog(err.Error())
return
}
_, filename := filepath.Split(path)
session.startDownload(downloadFile{
filename: filename,
path: path,
data: nil,
})
}
// DownloadFileData starts downloading the file on the client side. Arguments specify the name of the downloaded file and its contents
func (session *sessionData) DownloadFileData(filename string, data []byte) {
if data == nil {
ErrorLog("Invalid download data. Must be not nil.")
return
}
session.startDownload(downloadFile{
filename: filename,
path: "",
data: data,
})
}