74 lines
2.0 KiB
Go
74 lines
2.0 KiB
Go
// Package email sends QSO recordings to correspondents via SMTP. Pure Go (no
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// CGO) using go-mail; supports implicit SSL (465), STARTTLS (587) or none.
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package email
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import (
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"fmt"
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"time"
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"github.com/wneessen/go-mail"
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)
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// Config is the user's SMTP configuration.
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type Config struct {
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Host string
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Port int
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User string
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Password string
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From string
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Encryption string // "ssl" | "starttls" | "none"
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Auth bool // SMTP requires authorization (send username/password)
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}
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func (c Config) opts() []mail.Option {
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o := []mail.Option{mail.WithPort(c.Port), mail.WithTimeout(30 * time.Second)}
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if c.Auth && c.User != "" {
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// AutoDiscover negotiates whatever mechanism the server advertises
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// (LOGIN, PLAIN, CRAM-MD5, …). OVH, for instance, rejects forced PLAIN.
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o = append(o, mail.WithSMTPAuth(mail.SMTPAuthAutoDiscover), mail.WithUsername(c.User), mail.WithPassword(c.Password))
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}
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switch c.Encryption {
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case "ssl":
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o = append(o, mail.WithSSL())
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case "none":
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o = append(o, mail.WithTLSPolicy(mail.NoTLS))
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default: // starttls
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o = append(o, mail.WithTLSPolicy(mail.TLSMandatory))
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}
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return o
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}
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// Send delivers a plain-text email to `to`, optionally attaching a file.
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func Send(cfg Config, to, subject, body, attachPath string) error {
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if cfg.Host == "" {
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return fmt.Errorf("SMTP server not configured")
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}
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if to == "" {
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return fmt.Errorf("no recipient e-mail")
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}
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from := cfg.From
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if from == "" {
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from = cfg.User
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}
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m := mail.NewMsg()
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if err := m.From(from); err != nil {
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return fmt.Errorf("bad sender %q: %w", from, err)
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}
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if err := m.To(to); err != nil {
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return fmt.Errorf("bad recipient %q: %w", to, err)
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}
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m.Subject(subject)
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m.SetBodyString(mail.TypeTextPlain, body)
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if attachPath != "" {
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m.AttachFile(attachPath)
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}
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client, err := mail.NewClient(cfg.Host, cfg.opts()...)
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if err != nil {
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return fmt.Errorf("smtp client: %w", err)
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}
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if err := client.DialAndSend(m); err != nil {
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return fmt.Errorf("send: %w", err)
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}
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return nil
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}
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