OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [mime/] [multipart/] [writer.go] - Blame information for rev 833

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2011 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 multipart
6 
 
7 
import (
8 
        "bytes"
9 
        "crypto/rand"
10 
        "errors"
11 
        "fmt"
12 
        "io"
13 
        "net/textproto"
14 
        "strings"
15 
)
16 
 
17 
// A Writer generates multipart messages.
18 
type Writer struct {
19 
        w        io.Writer
20 
        boundary string
21 
        lastpart *part
22 
}
23 
 
24 
// NewWriter returns a new multipart Writer with a random boundary,
25 
// writing to w.
26 
func NewWriter(w io.Writer) *Writer {
27 
        return &Writer{
28 
                w:        w,
29 
                boundary: randomBoundary(),
30 
        }
31 
}
32 
 
33 
// Boundary returns the Writer's randomly selected boundary string.
34 
func (w *Writer) Boundary() string {
35 
        return w.boundary
36 
}
37 
 
38 
// FormDataContentType returns the Content-Type for an HTTP
39 
// multipart/form-data with this Writer's Boundary.
40 
func (w *Writer) FormDataContentType() string {
41 
        return "multipart/form-data; boundary=" + w.boundary
42 
}
43 
 
44 
func randomBoundary() string {
45 
        var buf [30]byte
46 
        _, err := io.ReadFull(rand.Reader, buf[:])
47 
        if err != nil {
48 
                panic(err)
49 
        }
50 
        return fmt.Sprintf("%x", buf[:])
51 
}
52 
 
53 
// CreatePart creates a new multipart section with the provided
54 
// header. The body of the part should be written to the returned
55 
// Writer. After calling CreatePart, any previous part may no longer
56 
// be written to.
57 
func (w *Writer) CreatePart(header textproto.MIMEHeader) (io.Writer, error) {
58 
        if w.lastpart != nil {
59 
                if err := w.lastpart.close(); err != nil {
60 
                        return nil, err
61 
                }
62 
        }
63 
        var b bytes.Buffer
64 
        if w.lastpart != nil {
65 
                fmt.Fprintf(&b, "\r\n--%s\r\n", w.boundary)
66 
        } else {
67 
                fmt.Fprintf(&b, "--%s\r\n", w.boundary)
68 
        }
69 
        // TODO(bradfitz): move this to textproto.MimeHeader.Write(w), have it sort
70 
        // and clean, like http.Header.Write(w) does.
71 
        for k, vv := range header {
72 
                for _, v := range vv {
73 
                        fmt.Fprintf(&b, "%s: %s\r\n", k, v)
74 
                }
75 
        }
76 
        fmt.Fprintf(&b, "\r\n")
77 
        _, err := io.Copy(w.w, &b)
78 
        if err != nil {
79 
                return nil, err
80 
        }
81 
        p := &part{
82 
                mw: w,
83 
        }
84 
        w.lastpart = p
85 
        return p, nil
86 
}
87 
 
88 
var quoteEscaper = strings.NewReplacer("\\", "\\\\", `"`, "\\\"")
89 
 
90 
func escapeQuotes(s string) string {
91 
        return quoteEscaper.Replace(s)
92 
}
93 
 
94 
// CreateFormFile is a convenience wrapper around CreatePart. It creates
95 
// a new form-data header with the provided field name and file name.
96 
func (w *Writer) CreateFormFile(fieldname, filename string) (io.Writer, error) {
97 
        h := make(textproto.MIMEHeader)
98 
        h.Set("Content-Disposition",
99 
                fmt.Sprintf(`form-data; name="%s"; filename="%s"`,
100 
                        escapeQuotes(fieldname), escapeQuotes(filename)))
101 
        h.Set("Content-Type", "application/octet-stream")
102 
        return w.CreatePart(h)
103 
}
104 
 
105 
// CreateFormField calls CreatePart with a header using the
106 
// given field name.
107 
func (w *Writer) CreateFormField(fieldname string) (io.Writer, error) {
108 
        h := make(textproto.MIMEHeader)
109 
        h.Set("Content-Disposition",
110 
                fmt.Sprintf(`form-data; name="%s"`, escapeQuotes(fieldname)))
111 
        return w.CreatePart(h)
112 
}
113 
 
114 
// WriteField calls CreateFormField and then writes the given value.
115 
func (w *Writer) WriteField(fieldname, value string) error {
116 
        p, err := w.CreateFormField(fieldname)
117 
        if err != nil {
118 
                return err
119 
        }
120 
        _, err = p.Write([]byte(value))
121 
        return err
122 
}
123 
 
124 
// Close finishes the multipart message and writes the trailing
125 
// boundary end line to the output.
126 
func (w *Writer) Close() error {
127 
        if w.lastpart != nil {
128 
                if err := w.lastpart.close(); err != nil {
129 
                        return err
130 
                }
131 
                w.lastpart = nil
132 
        }
133 
        _, err := fmt.Fprintf(w.w, "\r\n--%s--\r\n", w.boundary)
134 
        return err
135 
}
136 
 
137 
type part struct {
138 
        mw     *Writer
139 
        closed bool
140 
        we     error // last error that occurred writing
141 
}
142 
 
143 
func (p *part) close() error {
144 
        p.closed = true
145 
        return p.we
146 
}
147 
 
148 
func (p *part) Write(d []byte) (n int, err error) {
149 
        if p.closed {
150 
                return 0, errors.New("multipart: can't write to finished part")
151 
        }
152 
        n, err = p.mw.w.Write(d)
153 
        if err != nil {
154 
                p.we = err
155 
        }
156 
        return
157 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.