email.go
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email.go
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	/*
	* Copyright © 2020-2021 Musing Studio 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
	}