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@mattetti
Last active August 21, 2024 04:52
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Example of doing a multipart upload in Go (golang)
package main
import (
"bytes"
"fmt"
"io"
"log"
"mime/multipart"
"net/http"
"os"
"path/filepath"
)
// Creates a new file upload http request with optional extra params
func newfileUploadRequest(uri string, params map[string]string, paramName, path string) (*http.Request, error) {
file, err := os.Open(path)
if err != nil {
return nil, err
}
defer file.Close()
body := &bytes.Buffer{}
writer := multipart.NewWriter(body)
part, err := writer.CreateFormFile(paramName, filepath.Base(path))
if err != nil {
return nil, err
}
_, err = io.Copy(part, file)
for key, val := range params {
_ = writer.WriteField(key, val)
}
err = writer.Close()
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", uri, body)
req.Header.Set("Content-Type", writer.FormDataContentType())
return req, err
}
func main() {
path, _ := os.Getwd()
path += "/test.pdf"
extraParams := map[string]string{
"title": "My Document",
"author": "Matt Aimonetti",
"description": "A document with all the Go programming language secrets",
}
request, err := newfileUploadRequest("https://google.com/upload", extraParams, "file", "/tmp/doc.pdf")
if err != nil {
log.Fatal(err)
}
client := &http.Client{}
resp, err := client.Do(request)
if err != nil {
log.Fatal(err)
} else {
body := &bytes.Buffer{}
_, err := body.ReadFrom(resp.Body)
if err != nil {
log.Fatal(err)
}
resp.Body.Close()
fmt.Println(resp.StatusCode)
fmt.Println(resp.Header)
fmt.Println(body)
}
}
@nirajchandak
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If uploading specific format like gzip or server expect content other than octet-stream, better to use writer.CreatePart instead of formWriter.CreateFormFile

	part, err := writer.CreatePart(textproto.MIMEHeader{
		"Content-Type": []string{"application/x-gzip"},
		"Content-Disposition": []string{fmt.Sprintf(`form-data; name="%s"; filename="%s"`,
			"file", fi.Name())},
	})

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