add vendoring
This commit is contained in:
Aine
679
vendor/github.com/emersion/go-smtp/client.go
generated
vendored
Normal file
679
vendor/github.com/emersion/go-smtp/client.go
generated
vendored
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@@ -0,0 +1,679 @@
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// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package smtp
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import (
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"crypto/tls"
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"encoding/base64"
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"errors"
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"fmt"
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"io"
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"net"
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"net/textproto"
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"strconv"
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"strings"
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"time"
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"github.com/emersion/go-sasl"
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)
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// A Client represents a client connection to an SMTP server.
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type Client struct {
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// Text is the textproto.Conn used by the Client. It is exported to allow for
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// clients to add extensions.
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Text *textproto.Conn
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// keep a reference to the connection so it can be used to create a TLS
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// connection later
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conn net.Conn
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// whether the Client is using TLS
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tls bool
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serverName string
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lmtp bool
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// map of supported extensions
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ext map[string]string
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// supported auth mechanisms
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auth []string
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localName string // the name to use in HELO/EHLO/LHLO
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didHello bool // whether we've said HELO/EHLO/LHLO
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helloError error // the error from the hello
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rcpts []string // recipients accumulated for the current session
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// Time to wait for command responses (this includes 3xx reply to DATA).
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CommandTimeout time.Duration
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// Time to wait for responses after final dot.
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SubmissionTimeout time.Duration
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// Logger for all network activity.
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DebugWriter io.Writer
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}
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// Dial returns a new Client connected to an SMTP server at addr.
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// The addr must include a port, as in "mail.example.com:smtp".
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func Dial(addr string) (*Client, error) {
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conn, err := net.Dial("tcp", addr)
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if err != nil {
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return nil, err
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}
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host, _, _ := net.SplitHostPort(addr)
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return NewClient(conn, host)
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}
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// DialTLS returns a new Client connected to an SMTP server via TLS at addr.
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// The addr must include a port, as in "mail.example.com:smtps".
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//
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// A nil tlsConfig is equivalent to a zero tls.Config.
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func DialTLS(addr string, tlsConfig *tls.Config) (*Client, error) {
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conn, err := tls.Dial("tcp", addr, tlsConfig)
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if err != nil {
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return nil, err
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}
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host, _, _ := net.SplitHostPort(addr)
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return NewClient(conn, host)
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}
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// NewClient returns a new Client using an existing connection and host as a
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// server name to be used when authenticating.
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func NewClient(conn net.Conn, host string) (*Client, error) {
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c := &Client{
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serverName: host,
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localName: "localhost",
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// As recommended by RFC 5321. For DATA command reply (3xx one) RFC
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// recommends a slightly shorter timeout but we do not bother
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// differentiating these.
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CommandTimeout: 5 * time.Minute,
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// 10 minutes + 2 minute buffer in case the server is doing transparent
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// forwarding and also follows recommended timeouts.
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SubmissionTimeout: 12 * time.Minute,
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}
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c.setConn(conn)
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_, _, err := c.Text.ReadResponse(220)
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if err != nil {
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c.Text.Close()
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if protoErr, ok := err.(*textproto.Error); ok {
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return nil, toSMTPErr(protoErr)
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}
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return nil, err
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}
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return c, nil
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}
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// NewClientLMTP returns a new LMTP Client (as defined in RFC 2033) using an
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// existing connector and host as a server name to be used when authenticating.
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func NewClientLMTP(conn net.Conn, host string) (*Client, error) {
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c, err := NewClient(conn, host)
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if err != nil {
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return nil, err
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}
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c.lmtp = true
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return c, nil
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}
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// setConn sets the underlying network connection for the client.
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func (c *Client) setConn(conn net.Conn) {
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c.conn = conn
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var r io.Reader = conn
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var w io.Writer = conn
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r = &lineLimitReader{
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R: conn,
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// Doubled maximum line length per RFC 5321 (Section 4.5.3.1.6)
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LineLimit: 2000,
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}
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r = io.TeeReader(r, clientDebugWriter{c})
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w = io.MultiWriter(w, clientDebugWriter{c})
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rwc := struct {
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io.Reader
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io.Writer
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io.Closer
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}{
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Reader: r,
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Writer: w,
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Closer: conn,
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}
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c.Text = textproto.NewConn(rwc)
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_, isTLS := conn.(*tls.Conn)
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c.tls = isTLS
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}
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// Close closes the connection.
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func (c *Client) Close() error {
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return c.Text.Close()
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}
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// hello runs a hello exchange if needed.
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func (c *Client) hello() error {
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if !c.didHello {
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c.didHello = true
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err := c.ehlo()
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if err != nil {
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c.helloError = c.helo()
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}
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}
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return c.helloError
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}
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// Hello sends a HELO or EHLO to the server as the given host name.
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// Calling this method is only necessary if the client needs control
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// over the host name used. The client will introduce itself as "localhost"
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// automatically otherwise. If Hello is called, it must be called before
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// any of the other methods.
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//
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// If server returns an error, it will be of type *SMTPError.
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func (c *Client) Hello(localName string) error {
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if err := validateLine(localName); err != nil {
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return err
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}
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if c.didHello {
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return errors.New("smtp: Hello called after other methods")
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}
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c.localName = localName
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return c.hello()
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}
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// cmd is a convenience function that sends a command and returns the response
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// textproto.Error returned by c.Text.ReadResponse is converted into SMTPError.
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func (c *Client) cmd(expectCode int, format string, args ...interface{}) (int, string, error) {
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c.conn.SetDeadline(time.Now().Add(c.CommandTimeout))
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defer c.conn.SetDeadline(time.Time{})
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id, err := c.Text.Cmd(format, args...)
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if err != nil {
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return 0, "", err
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}
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c.Text.StartResponse(id)
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defer c.Text.EndResponse(id)
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code, msg, err := c.Text.ReadResponse(expectCode)
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if err != nil {
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if protoErr, ok := err.(*textproto.Error); ok {
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smtpErr := toSMTPErr(protoErr)
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return code, smtpErr.Message, smtpErr
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}
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return code, msg, err
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}
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return code, msg, nil
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}
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// helo sends the HELO greeting to the server. It should be used only when the
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// server does not support ehlo.
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func (c *Client) helo() error {
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c.ext = nil
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_, _, err := c.cmd(250, "HELO %s", c.localName)
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return err
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}
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// ehlo sends the EHLO (extended hello) greeting to the server. It
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// should be the preferred greeting for servers that support it.
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func (c *Client) ehlo() error {
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cmd := "EHLO"
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if c.lmtp {
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cmd = "LHLO"
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}
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_, msg, err := c.cmd(250, "%s %s", cmd, c.localName)
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if err != nil {
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return err
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}
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ext := make(map[string]string)
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extList := strings.Split(msg, "\n")
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if len(extList) > 1 {
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extList = extList[1:]
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for _, line := range extList {
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args := strings.SplitN(line, " ", 2)
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if len(args) > 1 {
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ext[args[0]] = args[1]
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} else {
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ext[args[0]] = ""
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}
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}
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}
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if mechs, ok := ext["AUTH"]; ok {
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c.auth = strings.Split(mechs, " ")
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}
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c.ext = ext
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return err
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}
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// StartTLS sends the STARTTLS command and encrypts all further communication.
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// Only servers that advertise the STARTTLS extension support this function.
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//
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// A nil config is equivalent to a zero tls.Config.
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//
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// If server returns an error, it will be of type *SMTPError.
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func (c *Client) StartTLS(config *tls.Config) error {
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if err := c.hello(); err != nil {
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return err
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}
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_, _, err := c.cmd(220, "STARTTLS")
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if err != nil {
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return err
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}
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if config == nil {
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config = &tls.Config{}
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}
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if config.ServerName == "" {
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// Make a copy to avoid polluting argument
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config = config.Clone()
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config.ServerName = c.serverName
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}
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if testHookStartTLS != nil {
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testHookStartTLS(config)
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}
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c.setConn(tls.Client(c.conn, config))
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return c.ehlo()
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}
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// TLSConnectionState returns the client's TLS connection state.
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// The return values are their zero values if StartTLS did
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// not succeed.
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func (c *Client) TLSConnectionState() (state tls.ConnectionState, ok bool) {
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tc, ok := c.conn.(*tls.Conn)
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if !ok {
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return
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}
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return tc.ConnectionState(), true
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}
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// Verify checks the validity of an email address on the server.
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// If Verify returns nil, the address is valid. A non-nil return
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// does not necessarily indicate an invalid address. Many servers
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// will not verify addresses for security reasons.
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//
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// If server returns an error, it will be of type *SMTPError.
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func (c *Client) Verify(addr string) error {
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if err := validateLine(addr); err != nil {
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return err
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}
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if err := c.hello(); err != nil {
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return err
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}
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_, _, err := c.cmd(250, "VRFY %s", addr)
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return err
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}
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// Auth authenticates a client using the provided authentication mechanism.
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// Only servers that advertise the AUTH extension support this function.
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//
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// If server returns an error, it will be of type *SMTPError.
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func (c *Client) Auth(a sasl.Client) error {
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if err := c.hello(); err != nil {
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return err
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}
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encoding := base64.StdEncoding
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mech, resp, err := a.Start()
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if err != nil {
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return err
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}
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resp64 := make([]byte, encoding.EncodedLen(len(resp)))
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encoding.Encode(resp64, resp)
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code, msg64, err := c.cmd(0, strings.TrimSpace(fmt.Sprintf("AUTH %s %s", mech, resp64)))
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for err == nil {
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var msg []byte
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switch code {
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case 334:
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msg, err = encoding.DecodeString(msg64)
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case 235:
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// the last message isn't base64 because it isn't a challenge
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msg = []byte(msg64)
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default:
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err = toSMTPErr(&textproto.Error{Code: code, Msg: msg64})
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}
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if err == nil {
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if code == 334 {
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resp, err = a.Next(msg)
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} else {
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resp = nil
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}
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}
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if err != nil {
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// abort the AUTH
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c.cmd(501, "*")
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break
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}
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if resp == nil {
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break
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}
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resp64 = make([]byte, encoding.EncodedLen(len(resp)))
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encoding.Encode(resp64, resp)
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code, msg64, err = c.cmd(0, string(resp64))
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}
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return err
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}
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// Mail issues a MAIL command to the server using the provided email address.
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// If the server supports the 8BITMIME extension, Mail adds the BODY=8BITMIME
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// parameter.
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// This initiates a mail transaction and is followed by one or more Rcpt calls.
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//
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// If opts is not nil, MAIL arguments provided in the structure will be added
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// to the command. Handling of unsupported options depends on the extension.
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//
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// If server returns an error, it will be of type *SMTPError.
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func (c *Client) Mail(from string, opts *MailOptions) error {
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if err := validateLine(from); err != nil {
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return err
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}
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if err := c.hello(); err != nil {
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return err
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}
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cmdStr := "MAIL FROM:<%s>"
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if _, ok := c.ext["8BITMIME"]; ok {
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cmdStr += " BODY=8BITMIME"
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}
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if _, ok := c.ext["SIZE"]; ok && opts != nil && opts.Size != 0 {
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cmdStr += " SIZE=" + strconv.Itoa(opts.Size)
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}
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if opts != nil && opts.RequireTLS {
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if _, ok := c.ext["REQUIRETLS"]; ok {
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cmdStr += " REQUIRETLS"
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||||
} else {
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return errors.New("smtp: server does not support REQUIRETLS")
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||||
}
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||||
}
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if opts != nil && opts.UTF8 {
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if _, ok := c.ext["SMTPUTF8"]; ok {
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cmdStr += " SMTPUTF8"
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} else {
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return errors.New("smtp: server does not support SMTPUTF8")
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||||
}
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}
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if opts != nil && opts.Auth != nil {
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||||
if _, ok := c.ext["AUTH"]; ok {
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cmdStr += " AUTH=" + encodeXtext(*opts.Auth)
|
||||
}
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||||
// We can safely discard parameter if server does not support AUTH.
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}
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_, _, err := c.cmd(250, cmdStr, from)
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||||
return err
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||||
}
|
||||
|
||||
// Rcpt issues a RCPT command to the server using the provided email address.
|
||||
// A call to Rcpt must be preceded by a call to Mail and may be followed by
|
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// a Data call or another Rcpt call.
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||||
//
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// If server returns an error, it will be of type *SMTPError.
|
||||
func (c *Client) Rcpt(to string) error {
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if err := validateLine(to); err != nil {
|
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return err
|
||||
}
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if _, _, err := c.cmd(25, "RCPT TO:<%s>", to); err != nil {
|
||||
return err
|
||||
}
|
||||
c.rcpts = append(c.rcpts, to)
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return nil
|
||||
}
|
||||
|
||||
type dataCloser struct {
|
||||
c *Client
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||||
io.WriteCloser
|
||||
statusCb func(rcpt string, status *SMTPError)
|
||||
}
|
||||
|
||||
func (d *dataCloser) Close() error {
|
||||
d.WriteCloser.Close()
|
||||
|
||||
d.c.conn.SetDeadline(time.Now().Add(d.c.SubmissionTimeout))
|
||||
defer d.c.conn.SetDeadline(time.Time{})
|
||||
|
||||
expectedResponses := len(d.c.rcpts)
|
||||
if d.c.lmtp {
|
||||
for expectedResponses > 0 {
|
||||
rcpt := d.c.rcpts[len(d.c.rcpts)-expectedResponses]
|
||||
if _, _, err := d.c.Text.ReadResponse(250); err != nil {
|
||||
if protoErr, ok := err.(*textproto.Error); ok {
|
||||
if d.statusCb != nil {
|
||||
d.statusCb(rcpt, toSMTPErr(protoErr))
|
||||
}
|
||||
} else {
|
||||
return err
|
||||
}
|
||||
} else if d.statusCb != nil {
|
||||
d.statusCb(rcpt, nil)
|
||||
}
|
||||
expectedResponses--
|
||||
}
|
||||
return nil
|
||||
} else {
|
||||
_, _, err := d.c.Text.ReadResponse(250)
|
||||
if err != nil {
|
||||
if protoErr, ok := err.(*textproto.Error); ok {
|
||||
return toSMTPErr(protoErr)
|
||||
}
|
||||
return err
|
||||
}
|
||||
return nil
|
||||
}
|
||||
}
|
||||
|
||||
// Data issues a DATA command to the server and returns a writer that
|
||||
// can be used to write the mail headers and body. The caller should
|
||||
// close the writer before calling any more methods on c. A call to
|
||||
// Data must be preceded by one or more calls to Rcpt.
|
||||
//
|
||||
// If server returns an error, it will be of type *SMTPError.
|
||||
func (c *Client) Data() (io.WriteCloser, error) {
|
||||
_, _, err := c.cmd(354, "DATA")
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &dataCloser{c, c.Text.DotWriter(), nil}, nil
|
||||
}
|
||||
|
||||
// LMTPData is the LMTP-specific version of the Data method. It accepts a callback
|
||||
// that will be called for each status response received from the server.
|
||||
//
|
||||
// Status callback will receive a SMTPError argument for each negative server
|
||||
// reply and nil for each positive reply. I/O errors will not be reported using
|
||||
// callback and instead will be returned by the Close method of io.WriteCloser.
|
||||
// Callback will be called for each successfull Rcpt call done before in the
|
||||
// same order.
|
||||
func (c *Client) LMTPData(statusCb func(rcpt string, status *SMTPError)) (io.WriteCloser, error) {
|
||||
if !c.lmtp {
|
||||
return nil, errors.New("smtp: not a LMTP client")
|
||||
}
|
||||
|
||||
_, _, err := c.cmd(354, "DATA")
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &dataCloser{c, c.Text.DotWriter(), statusCb}, nil
|
||||
}
|
||||
|
||||
var testHookStartTLS func(*tls.Config) // nil, except for tests
|
||||
|
||||
// SendMail connects to the server at addr, switches to TLS if
|
||||
// possible, authenticates with the optional mechanism a if possible,
|
||||
// and then sends an email from address from, to addresses to, with
|
||||
// message r.
|
||||
// The addr must include a port, as in "mail.example.com:smtp".
|
||||
//
|
||||
// The addresses in the to parameter are the SMTP RCPT addresses.
|
||||
//
|
||||
// The r parameter should be an RFC 822-style email with headers
|
||||
// first, a blank line, and then the message body. The lines of r
|
||||
// should be CRLF terminated. The r headers should usually include
|
||||
// fields such as "From", "To", "Subject", and "Cc". Sending "Bcc"
|
||||
// messages is accomplished by including an email address in the to
|
||||
// parameter but not including it in the r headers.
|
||||
//
|
||||
// SendMail is intended to be used for very simple use-cases. If you want to
|
||||
// customize SendMail's behavior, use a Client instead.
|
||||
//
|
||||
// The SendMail function and the go-smtp package are low-level
|
||||
// mechanisms and provide no support for DKIM signing (see go-msgauth), MIME
|
||||
// attachments (see the mime/multipart package or the go-message package), or
|
||||
// other mail functionality.
|
||||
func SendMail(addr string, a sasl.Client, from string, to []string, r io.Reader) error {
|
||||
if err := validateLine(from); err != nil {
|
||||
return err
|
||||
}
|
||||
for _, recp := range to {
|
||||
if err := validateLine(recp); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
c, err := Dial(addr)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer c.Close()
|
||||
if err = c.hello(); err != nil {
|
||||
return err
|
||||
}
|
||||
if ok, _ := c.Extension("STARTTLS"); ok {
|
||||
if err = c.StartTLS(nil); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
if a != nil && c.ext != nil {
|
||||
if _, ok := c.ext["AUTH"]; !ok {
|
||||
return errors.New("smtp: server doesn't support AUTH")
|
||||
}
|
||||
if err = c.Auth(a); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
if err = c.Mail(from, nil); err != nil {
|
||||
return err
|
||||
}
|
||||
for _, addr := range to {
|
||||
if err = c.Rcpt(addr); err != nil {
|
||||
return err
|
||||
}
|
||||
}
|
||||
w, err := c.Data()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
_, err = io.Copy(w, r)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
err = w.Close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return c.Quit()
|
||||
}
|
||||
|
||||
// Extension reports whether an extension is support by the server.
|
||||
// The extension name is case-insensitive. If the extension is supported,
|
||||
// Extension also returns a string that contains any parameters the
|
||||
// server specifies for the extension.
|
||||
func (c *Client) Extension(ext string) (bool, string) {
|
||||
if err := c.hello(); err != nil {
|
||||
return false, ""
|
||||
}
|
||||
if c.ext == nil {
|
||||
return false, ""
|
||||
}
|
||||
ext = strings.ToUpper(ext)
|
||||
param, ok := c.ext[ext]
|
||||
return ok, param
|
||||
}
|
||||
|
||||
// Reset sends the RSET command to the server, aborting the current mail
|
||||
// transaction.
|
||||
func (c *Client) Reset() error {
|
||||
if err := c.hello(); err != nil {
|
||||
return err
|
||||
}
|
||||
if _, _, err := c.cmd(250, "RSET"); err != nil {
|
||||
return err
|
||||
}
|
||||
c.rcpts = nil
|
||||
return nil
|
||||
}
|
||||
|
||||
// Noop sends the NOOP command to the server. It does nothing but check
|
||||
// that the connection to the server is okay.
|
||||
func (c *Client) Noop() error {
|
||||
if err := c.hello(); err != nil {
|
||||
return err
|
||||
}
|
||||
_, _, err := c.cmd(250, "NOOP")
|
||||
return err
|
||||
}
|
||||
|
||||
// Quit sends the QUIT command and closes the connection to the server.
|
||||
//
|
||||
// If Quit fails the connection is not closed, Close should be used
|
||||
// in this case.
|
||||
func (c *Client) Quit() error {
|
||||
if err := c.hello(); err != nil {
|
||||
return err
|
||||
}
|
||||
_, _, err := c.cmd(221, "QUIT")
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
return c.Text.Close()
|
||||
}
|
||||
|
||||
func parseEnhancedCode(s string) (EnhancedCode, error) {
|
||||
parts := strings.Split(s, ".")
|
||||
if len(parts) != 3 {
|
||||
return EnhancedCode{}, fmt.Errorf("wrong amount of enhanced code parts")
|
||||
}
|
||||
|
||||
code := EnhancedCode{}
|
||||
for i, part := range parts {
|
||||
num, err := strconv.Atoi(part)
|
||||
if err != nil {
|
||||
return code, err
|
||||
}
|
||||
code[i] = num
|
||||
}
|
||||
return code, nil
|
||||
}
|
||||
|
||||
// toSMTPErr converts textproto.Error into SMTPError, parsing
|
||||
// enhanced status code if it is present.
|
||||
func toSMTPErr(protoErr *textproto.Error) *SMTPError {
|
||||
if protoErr == nil {
|
||||
return nil
|
||||
}
|
||||
smtpErr := &SMTPError{
|
||||
Code: protoErr.Code,
|
||||
Message: protoErr.Msg,
|
||||
}
|
||||
|
||||
parts := strings.SplitN(protoErr.Msg, " ", 2)
|
||||
if len(parts) != 2 {
|
||||
return smtpErr
|
||||
}
|
||||
|
||||
enchCode, err := parseEnhancedCode(parts[0])
|
||||
if err != nil {
|
||||
return smtpErr
|
||||
}
|
||||
|
||||
msg := parts[1]
|
||||
|
||||
// Per RFC 2034, enhanced code should be prepended to each line.
|
||||
msg = strings.ReplaceAll(msg, "\n"+parts[0]+" ", "\n")
|
||||
|
||||
smtpErr.EnhancedCode = enchCode
|
||||
smtpErr.Message = msg
|
||||
return smtpErr
|
||||
}
|
||||
|
||||
type clientDebugWriter struct {
|
||||
c *Client
|
||||
}
|
||||
|
||||
func (cdw clientDebugWriter) Write(b []byte) (int, error) {
|
||||
if cdw.c.DebugWriter == nil {
|
||||
return len(b), nil
|
||||
}
|
||||
return cdw.c.DebugWriter.Write(b)
|
||||
}
|
||||
Reference in New Issue
Block a user