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// Copyright (c) 2020-2025 Bryan Frimin <bryan@frimin.fr>.
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
// OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.
package privatebin
import (
"encoding/base64"
"encoding/json"
"errors"
"fmt"
"mime"
"net/url"
"path/filepath"
"strings"
)
type (
Paste struct {
Data []byte
Attachment []byte
AttachmentName string
MimeType string
}
)
func (p Paste) MarshalJSON() ([]byte, error) {
output := map[string]string{}
if len(p.Attachment) > 0 {
mimeType := p.MimeType
if mimeType == "" {
ext := filepath.Ext(p.AttachmentName)
mimeType = mime.TypeByExtension(ext)
if mimeType == "" {
mimeType = "application/octet-stream"
}
}
if p.AttachmentName != "" {
output["attachment_name"] = p.AttachmentName
}
output["attachment"] = fmt.Sprintf(
"data:%s;base64,%s",
mimeType,
base64.StdEncoding.EncodeToString(p.Attachment),
)
}
if len(p.Data) > 0 {
output["paste"] = string(p.Data)
}
return json.Marshal(output)
}
func (p *Paste) UnmarshalJSON(data []byte) error {
output := map[string]string{}
err := json.Unmarshal(data, &output)
if err != nil {
return err
}
var attachment []byte
var mimeType string
attachmentURL, ok := output["attachment"]
if ok {
parsedURL, err := url.Parse(attachmentURL)
if err != nil {
return fmt.Errorf("invalid attachment: error parsing url: %w", err)
}
parts := strings.Split(parsedURL.Opaque, ",")
if len(parts) != 2 {
return errors.New("invalid attachment: invalid data URL format")
}
if !strings.HasSuffix(parts[0], ";base64") {
return errors.New("invalid attachment: missing or invalid base64 encoding")
}
mimeType = strings.TrimSuffix(parts[0], ";base64")
if mimeType == "" {
mimeType = "application/octet-stream"
}
attachment, err = decode64(parts[1])
if err != nil {
return fmt.Errorf("invalid attachment: cannot base64 decode data: %w", err)
}
}
*p = Paste{
[]byte(output["paste"]),
attachment,
output["attachment_name"],
mimeType,
}
return nil
}
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