mirror of
https://github.com/ergochat/ergo.git
synced 2024-11-24 12:59:33 +01:00
55 lines
1.2 KiB
Go
55 lines
1.2 KiB
Go
// Copyright (c) 2020 Shivaram Lingamneni
|
|
// released under the MIT license
|
|
|
|
package email
|
|
|
|
import (
|
|
"errors"
|
|
dkim "github.com/toorop/go-dkim"
|
|
"os"
|
|
)
|
|
|
|
var (
|
|
ErrMissingFields = errors.New("DKIM config is missing fields")
|
|
)
|
|
|
|
type DKIMConfig struct {
|
|
Domain string
|
|
Selector string
|
|
KeyFile string `yaml:"key-file"`
|
|
keyBytes []byte
|
|
}
|
|
|
|
func (dkim *DKIMConfig) Postprocess() (err error) {
|
|
if dkim.Domain != "" {
|
|
if dkim.Selector == "" || dkim.KeyFile == "" {
|
|
return ErrMissingFields
|
|
}
|
|
dkim.keyBytes, err = os.ReadFile(dkim.KeyFile)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
var defaultOptions = dkim.SigOptions{
|
|
Version: 1,
|
|
Canonicalization: "relaxed/relaxed",
|
|
Algo: "rsa-sha256",
|
|
Headers: []string{"from", "to", "subject", "message-id", "date"},
|
|
BodyLength: 0,
|
|
QueryMethods: []string{"dns/txt"},
|
|
AddSignatureTimestamp: true,
|
|
SignatureExpireIn: 0,
|
|
}
|
|
|
|
func DKIMSign(message []byte, dkimConfig DKIMConfig) (result []byte, err error) {
|
|
options := defaultOptions
|
|
options.PrivateKey = dkimConfig.keyBytes
|
|
options.Domain = dkimConfig.Domain
|
|
options.Selector = dkimConfig.Selector
|
|
err = dkim.Sign(&message, options)
|
|
return message, err
|
|
}
|