how to get file name of multipart-form file in go?
Question
I am trying to upload a multipart form which has a file along with some other data. I know the tag name for the file using which I do FormFile but I want to get the name of the file also. I am not able to figure out how to do this?
1 answers
solution1
2 2020-04-01 06:46:53
Given a simple form like this in a file called form.html :
<html lang="en">
<head>
<meta charset="UTF-8">
<title>File Upload example</title>
</head>
<body>
<form action="/form-endpoint" method="post" enctype="multipart/form-data">
<label for="file-input">Choose an image</label>
<input type="file" id="file-input" name="file-input" accept="image/png, image/jpeg">
<input type="submit" value="Submit">
</form>
</body>
</html>
I can get the file name of the uploaded file using the POST request's *multipart.Reader struct like so in a file called main.go :
package main
import (
"io"
"log"
"net/http"
)
func serveForm(w http.ResponseWriter, r *http.Request) {
http.ServeFile(w, r, "form.html")
}
func handleFormSubmit(w http.ResponseWriter, r *http.Request) {
reader, err := r.MultipartReader()
if err != nil {
log.Fatalf("failed to create multipart-reader: %s", err)
}
for p, err := reader.NextPart(); err != io.EOF; p, err = reader.NextPart() {
log.Println(p.FileName()) // This line in particular is what you're looking for.
}
}
func main() {
http.HandleFunc("/", serveForm)
http.HandleFunc("/form-endpoint", handleFormSubmit)
if err := http.ListenAndServe(":8000", nil); err != nil {
log.Fatalf("failed to start server: %s", err)
}
}
This is a good starting point in the docs to learn more about multipart/form-data reading: https://golang.org/pkg/net/http/#Request.MultipartReader
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