writefreely/spam/email.go

44 lines
997 B
Go

/*
* Copyright © 2020-2021 A Bunch Tell LLC.
*
* This file is part of WriteFreely.
*
* WriteFreely is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, included
* in the LICENSE file in this source code package.
*/
package spam
import (
"github.com/writeas/web-core/id"
"strings"
)
var honeypotField string
func HoneypotFieldName() string {
if honeypotField == "" {
honeypotField = id.Generate62RandomString(39)
}
return honeypotField
}
// CleanEmail takes an email address and strips it down to a unique address that can be blocked.
func CleanEmail(email string) string {
emailParts := strings.Split(strings.ToLower(email), "@")
if len(emailParts) < 2 {
return ""
}
u := emailParts[0]
d := emailParts[1]
// Ignore anything after '+'
plusIdx := strings.IndexRune(u, '+')
if plusIdx > -1 {
u = u[:plusIdx]
}
// Strip dots in email address
u = strings.ReplaceAll(u, ".", "")
return u + "@" + d
}