1// Copyright 2019 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package http
6
7import (
8	"mime/multipart"
9	"net/textproto"
10	"net/url"
11)
12
13func cloneURLValues(v url.Values) url.Values {
14	if v == nil {
15		return nil
16	}
17	// http.Header and url.Values have the same representation, so temporarily
18	// treat it like http.Header, which does have a clone:
19	return url.Values(Header(v).Clone())
20}
21
22func cloneURL(u *url.URL) *url.URL {
23	if u == nil {
24		return nil
25	}
26	u2 := new(url.URL)
27	*u2 = *u
28	if u.User != nil {
29		u2.User = new(url.Userinfo)
30		*u2.User = *u.User
31	}
32	return u2
33}
34
35func cloneMultipartForm(f *multipart.Form) *multipart.Form {
36	if f == nil {
37		return nil
38	}
39	f2 := &multipart.Form{
40		Value: (map[string][]string)(Header(f.Value).Clone()),
41	}
42	if f.File != nil {
43		m := make(map[string][]*multipart.FileHeader)
44		for k, vv := range f.File {
45			vv2 := make([]*multipart.FileHeader, len(vv))
46			for i, v := range vv {
47				vv2[i] = cloneMultipartFileHeader(v)
48			}
49			m[k] = vv2
50		}
51		f2.File = m
52	}
53	return f2
54}
55
56func cloneMultipartFileHeader(fh *multipart.FileHeader) *multipart.FileHeader {
57	if fh == nil {
58		return nil
59	}
60	fh2 := new(multipart.FileHeader)
61	*fh2 = *fh
62	fh2.Header = textproto.MIMEHeader(Header(fh.Header).Clone())
63	return fh2
64}
65
66// cloneOrMakeHeader invokes Header.Clone but if the
67// result is nil, it'll instead make and return a non-nil Header.
68func cloneOrMakeHeader(hdr Header) Header {
69	clone := hdr.Clone()
70	if clone == nil {
71		clone = make(Header)
72	}
73	return clone
74}
75