MiFaZhan
111 lines
2.7 KiB
Go
111 lines
2.7 KiB
Go
package utility
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import (
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"context"
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"crypto/tls"
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"net"
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"net/smtp"
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"strings"
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"time"
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"github.com/gogf/gf/v2/errors/gerror"
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)
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const DefaultExternalRequestTimeout = 10 * time.Second
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func ExternalRequestTimeout(configured string) time.Duration {
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timeout, err := time.ParseDuration(strings.TrimSpace(configured))
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if err != nil || timeout <= 0 {
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return DefaultExternalRequestTimeout
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}
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return timeout
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}
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type SMTPOptions struct {
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Address string
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Host string
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Auth smtp.Auth
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From string
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To []string
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Data []byte
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SSL bool
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Timeout time.Duration
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}
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func SendSMTP(ctx context.Context, options SMTPOptions) (err error) {
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if ctx == nil {
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ctx = context.Background()
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}
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timeout := options.Timeout
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if timeout <= 0 {
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timeout = DefaultExternalRequestTimeout
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}
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ctx, cancel := context.WithTimeout(ctx, timeout)
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defer cancel()
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defer func() {
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if err != nil && ctx.Err() != nil {
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err = gerror.Wrap(ctx.Err(), "SMTP request canceled or timed out")
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}
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}()
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dialer := &net.Dialer{Timeout: timeout}
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conn, err := dialer.DialContext(ctx, "tcp", options.Address)
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if err != nil {
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return gerror.Wrap(err, "connect SMTP server failed")
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}
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defer conn.Close()
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stop := context.AfterFunc(ctx, func() {
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_ = conn.Close()
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})
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defer stop()
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deadline, _ := ctx.Deadline()
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if err = conn.SetDeadline(deadline); err != nil {
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return gerror.Wrap(err, "set SMTP deadline failed")
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}
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tlsConfig := &tls.Config{ServerName: options.Host, MinVersion: tls.VersionTLS12}
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smtpConn := conn
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if options.SSL {
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tlsConn := tls.Client(conn, tlsConfig)
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if err = tlsConn.HandshakeContext(ctx); err != nil {
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return gerror.Wrap(err, "SMTP TLS handshake failed")
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}
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smtpConn = tlsConn
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}
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client, err := smtp.NewClient(smtpConn, options.Host)
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if err != nil {
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return gerror.Wrap(err, "read SMTP greeting failed")
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}
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defer client.Close()
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if !options.SSL {
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if available, _ := client.Extension("STARTTLS"); available {
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if err = client.StartTLS(tlsConfig); err != nil {
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return gerror.Wrap(err, "SMTP STARTTLS failed")
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}
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}
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}
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if options.Auth != nil {
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if err = client.Auth(options.Auth); err != nil {
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return gerror.Wrap(err, "SMTP authentication failed")
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}
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}
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if err = client.Mail(options.From); err != nil {
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return gerror.Wrap(err, "SMTP sender rejected")
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}
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for _, recipient := range options.To {
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if err = client.Rcpt(recipient); err != nil {
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return gerror.Wrap(err, "SMTP recipient rejected")
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}
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}
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writer, err := client.Data()
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if err != nil {
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return gerror.Wrap(err, "start SMTP message failed")
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}
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if _, err = writer.Write(options.Data); err != nil {
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_ = writer.Close()
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return gerror.Wrap(err, "write SMTP message failed")
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}
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if err = writer.Close(); err != nil {
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return gerror.Wrap(err, "SMTP message rejected")
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}
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return client.Quit()
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}
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