Source file src/net/http/clone.go

     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	
     5	package http
     6	
     7	import (
     8		"mime/multipart"
     9		"net/textproto"
    10		"net/url"
    11	)
    12	
    13	func 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	
    22	func 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	
    35	func 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	
    56	func 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.
    68	func cloneOrMakeHeader(hdr Header) Header {
    69		clone := hdr.Clone()
    70		if clone == nil {
    71			clone = make(Header)
    72		}
    73		return clone
    74	}
    75	

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