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Winni Neessen
580981b158
Centralized error definitions in `smtp/auth.go` and updated references in `auth_login.go` and `auth_plain.go`. This improves code maintainability and error consistency across the package.
57 lines
2.4 KiB
Go
57 lines
2.4 KiB
Go
// SPDX-FileCopyrightText: Copyright 2010 The Go Authors. All rights reserved.
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// SPDX-FileCopyrightText: Copyright (c) 2022-2023 The go-mail Authors
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//
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// Original net/smtp code from the Go stdlib by the Go Authors.
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// Use of this source code is governed by a BSD-style
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// LICENSE file that can be found in this directory.
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//
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// go-mail specific modifications by the go-mail Authors.
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// Licensed under the MIT License.
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// See [PROJECT ROOT]/LICENSES directory for more information.
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//
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// SPDX-License-Identifier: BSD-3-Clause AND MIT
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package smtp
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import "errors"
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var (
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// ErrUnencrypted is an error indicating that the connection is not encrypted.
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ErrUnencrypted = errors.New("unencrypted connection")
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// ErrUnexpectedServerChallange is an error indicating that the server issued an unexpected challenge.
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ErrUnexpectedServerChallange = errors.New("unexpected server challenge")
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// ErrUnexpectedServerResponse is an error indicating that the server issued an unexpected response.
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ErrUnexpectedServerResponse = errors.New("unexpected server response")
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// ErrWrongHostname is an error indicating that the provided hostname does not match the expected value.
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ErrWrongHostname = errors.New("wrong host name")
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)
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// Auth is implemented by an SMTP authentication mechanism.
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type Auth interface {
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// Start begins an authentication with a server.
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// It returns the name of the authentication protocol
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// and optionally data to include in the initial AUTH message
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// sent to the server.
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// If it returns a non-nil error, the SMTP client aborts
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// the authentication attempt and closes the connection.
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Start(server *ServerInfo) (proto string, toServer []byte, err error)
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// Next continues the authentication. The server has just sent
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// the fromServer data. If more is true, the server expects a
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// response, which Next should return as toServer; otherwise
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// Next should return toServer == nil.
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// If Next returns a non-nil error, the SMTP client aborts
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// the authentication attempt and closes the connection.
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Next(fromServer []byte, more bool) (toServer []byte, err error)
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}
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// ServerInfo records information about an SMTP server.
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type ServerInfo struct {
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Name string // SMTP server name
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TLS bool // using TLS, with valid certificate for Name
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Auth []string // advertised authentication mechanisms
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}
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func isLocalhost(name string) bool {
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return name == "localhost" || name == "127.0.0.1" || name == "::1"
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}
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