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|
package gomf
import (
"bytes"
"context"
"fmt"
"mime/multipart"
"net/http"
"net/textproto"
)
type FormBuilder struct {
w *multipart.Writer
b *bytes.Buffer
}
func New() *FormBuilder {
buf := new(bytes.Buffer)
writer := multipart.NewWriter(buf)
return &FormBuilder{
w: writer,
b: buf,
}
}
func (ufw *FormBuilder) WriteField(name, value string) error {
w, err := ufw.w.CreateFormField(name)
if err != nil {
return err
}
_, err = w.Write([]byte(value))
if err != nil {
return err
}
return nil
}
// WriteFile if contentType is empty-string, will auto convert to application/octet-stream
func (ufw *FormBuilder) WriteFile(fieldName, fileName, contentType string, content []byte) error {
if contentType == "" {
contentType = "application/octet-stream"
}
wx, err := ufw.w.CreatePart(textproto.MIMEHeader{
"Content-Type": []string{
contentType,
},
"Content-Disposition": []string{
fmt.Sprintf(`form-data; name="%s"; filename="%s"`, fieldName, fileName),
},
})
if err != nil {
return err
}
_, err = wx.Write(content)
if err != nil {
return err
}
return nil
}
func (fb *FormBuilder) Close() error {
return fb.w.Close()
}
func (fb *FormBuilder) GetBuffer() *bytes.Buffer {
return fb.b
}
func (fb *FormBuilder) GetHTTPRequest(ctx context.Context, reqURL string) (*http.Request, error) {
err := fb.Close()
if err != nil {
return nil, err
}
req, err := http.NewRequest("POST", reqURL, fb.b)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", fb.w.FormDataContentType())
req = req.WithContext(ctx)
return req, nil
}
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