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multipart.go
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multipart.go
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// Copyright (c) 2022 Aton-Kish
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package userdata
import (
"fmt"
"io"
"mime"
"regexp"
)
const (
defaultBoundary = "+Go+User+Data+Boundary=="
defaultMIMEVersion = "1.0"
)
var (
boundaryRe = regexp.MustCompile(`^[0-9a-zA-Z'()+_,-./:=? ]{0,69}[0-9a-zA-Z'()+_,-./:=?]$`)
)
type Multipart interface {
Append(part Part)
Renderer
}
type multipart struct {
header Header
parts []Part
boundary string
}
func NewMultipart() (Multipart, error) {
return NewMultipartWithBoundary(defaultBoundary)
}
func NewMultipartWithBoundary(boundary string) (Multipart, error) {
if !boundaryRe.MatchString(boundary) {
err := &Error{Op: "initialize", Err: ErrInvalidBoundary}
logger.Println("failed to initialize multipart", "func", getFuncName(), "error", err)
return nil, err
}
typ := mime.FormatMediaType("multipart/mixed", map[string]string{"boundary": boundary})
h := NewHeader()
h.Set("Mime-Version", defaultMIMEVersion)
h.Set("Content-Type", typ)
p := make([]Part, 0)
m := &multipart{header: h, parts: p, boundary: boundary}
return m, nil
}
func (m *multipart) Append(part Part) {
m.parts = append(m.parts, part)
}
func (m *multipart) Render(w io.Writer) error {
if err := m.header.Render(w); err != nil {
logger.Println("failed to render multipart", "func", getFuncName(), "multipart", m, "error", err)
return err
}
if _, err := fmt.Fprint(w, "\r\n"); err != nil {
err = &Error{Op: "render", Err: err}
logger.Println("failed to render multipart", "func", getFuncName(), "multipart", m, "error", err)
return err
}
for _, part := range m.parts {
if _, err := fmt.Fprintf(w, "--%s\r\n", m.boundary); err != nil {
err = &Error{Op: "render", Err: err}
logger.Println("failed to render multipart", "func", getFuncName(), "multipart", m, "error", err)
return err
}
if err := part.Render(w); err != nil {
logger.Println("failed to render multipart", "func", getFuncName(), "multipart", m, "error", err)
return err
}
if _, err := fmt.Fprint(w, "\r\n"); err != nil {
err = &Error{Op: "render", Err: err}
logger.Println("failed to render multipart", "func", getFuncName(), "multipart", m, "error", err)
return err
}
}
if _, err := fmt.Fprintf(w, "--%s--\r\n", m.boundary); err != nil {
err = &Error{Op: "render", Err: err}
logger.Println("failed to render multipart", "func", getFuncName(), "multipart", m, "error", err)
return err
}
return nil
}