116 lines
2.4 KiB
Go
116 lines
2.4 KiB
Go
package mail
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import (
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"errors"
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"fmt"
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"io"
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stdmail "net/mail"
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)
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// Sender is the interface that wraps the Send method.
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//
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// Send sends an email to the given addresses.
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type Sender interface {
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Send(from string, to []string, msg io.WriterTo) error
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}
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// SendCloser is the interface that groups the Send and Close methods.
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type SendCloser interface {
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Sender
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Close() error
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}
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// A SendFunc is a function that sends emails to the given addresses.
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//
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// The SendFunc type is an adapter to allow the use of ordinary functions as
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// email senders. If f is a function with the appropriate signature, SendFunc(f)
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// is a Sender object that calls f.
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type SendFunc func(from string, to []string, msg io.WriterTo) error
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// Send calls f(from, to, msg).
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func (f SendFunc) Send(from string, to []string, msg io.WriterTo) error {
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return f(from, to, msg)
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}
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// Send sends emails using the given Sender.
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func Send(s Sender, msg ...*Message) error {
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for i, m := range msg {
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if err := send(s, m); err != nil {
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return &SendError{Cause: err, Index: uint(i)}
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}
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}
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return nil
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}
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func send(s Sender, m *Message) error {
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from, err := m.getFrom()
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if err != nil {
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return err
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}
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to, err := m.getRecipients()
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if err != nil {
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return err
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}
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if err := s.Send(from, to, m); err != nil {
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return err
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}
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return nil
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}
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func (m *Message) getFrom() (string, error) {
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from := m.header["Sender"]
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if len(from) == 0 {
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from = m.header["From"]
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if len(from) == 0 {
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return "", errors.New(`gomail: invalid message, "From" field is absent`)
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}
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}
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return parseAddress(from[0])
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}
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func (m *Message) getRecipients() ([]string, error) {
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n := 0
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for _, field := range []string{"To", "Cc", "Bcc"} {
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if addresses, ok := m.header[field]; ok {
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n += len(addresses)
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}
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}
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list := make([]string, 0, n)
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for _, field := range []string{"To", "Cc", "Bcc"} {
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if addresses, ok := m.header[field]; ok {
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for _, a := range addresses {
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addr, err := parseAddress(a)
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if err != nil {
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return nil, err
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}
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list = addAddress(list, addr)
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}
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}
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}
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return list, nil
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}
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func addAddress(list []string, addr string) []string {
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for _, a := range list {
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if addr == a {
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return list
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}
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}
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return append(list, addr)
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}
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func parseAddress(field string) (string, error) {
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addr, err := stdmail.ParseAddress(field)
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if err != nil {
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return "", fmt.Errorf("gomail: invalid address %q: %v", field, err)
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}
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return addr.Address, nil
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}
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