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4d8f2ec997
Set up project files and add .gitignore to exclude local build/runtime artifacts. Made-with: Cursor
132 lines
2.8 KiB
Go
132 lines
2.8 KiB
Go
package email
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import (
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"context"
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"crypto/tls"
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"fmt"
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"strings"
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"time"
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gomail "gopkg.in/gomail.v2"
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)
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// Message 发信参数
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type Message struct {
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To []string
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Cc []string
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Bcc []string
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ReplyTo []string
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Subject string
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TextBody string
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HTMLBody string
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Attachments []string
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}
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type Client interface {
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IsEnabled() bool
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Config() Config
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Send(ctx context.Context, msg Message) error
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}
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type clientImpl struct {
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cfg Config
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}
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func NewClient(cfg Config) Client {
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return &clientImpl{cfg: cfg}
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}
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func (c *clientImpl) IsEnabled() bool {
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return c.cfg.Enabled &&
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strings.TrimSpace(c.cfg.Host) != "" &&
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c.cfg.Port > 0 &&
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strings.TrimSpace(c.cfg.FromAddress) != ""
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}
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func (c *clientImpl) Config() Config {
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return c.cfg
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}
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func (c *clientImpl) Send(ctx context.Context, msg Message) error {
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if !c.IsEnabled() {
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return fmt.Errorf("email client is disabled or misconfigured")
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}
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if len(msg.To) == 0 {
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return fmt.Errorf("email recipient is empty")
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}
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if strings.TrimSpace(msg.Subject) == "" {
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return fmt.Errorf("email subject is empty")
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}
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if strings.TrimSpace(msg.TextBody) == "" && strings.TrimSpace(msg.HTMLBody) == "" {
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return fmt.Errorf("email body is empty")
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}
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m := gomail.NewMessage()
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m.SetAddressHeader("From", c.cfg.FromAddress, c.cfg.FromName)
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m.SetHeader("To", msg.To...)
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if len(msg.Cc) > 0 {
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m.SetHeader("Cc", msg.Cc...)
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}
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if len(msg.Bcc) > 0 {
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m.SetHeader("Bcc", msg.Bcc...)
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}
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if len(msg.ReplyTo) > 0 {
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m.SetHeader("Reply-To", msg.ReplyTo...)
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}
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m.SetHeader("Subject", msg.Subject)
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if strings.TrimSpace(msg.TextBody) != "" && strings.TrimSpace(msg.HTMLBody) != "" {
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m.SetBody("text/plain", msg.TextBody)
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m.AddAlternative("text/html", msg.HTMLBody)
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} else if strings.TrimSpace(msg.HTMLBody) != "" {
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m.SetBody("text/html", msg.HTMLBody)
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} else {
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m.SetBody("text/plain", msg.TextBody)
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}
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for _, attachment := range msg.Attachments {
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if strings.TrimSpace(attachment) == "" {
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continue
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}
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m.Attach(attachment)
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}
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timeout := c.cfg.TimeoutSeconds
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if timeout <= 0 {
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timeout = 15
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}
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dialer := gomail.NewDialer(c.cfg.Host, c.cfg.Port, c.cfg.Username, c.cfg.Password)
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if c.cfg.UseTLS {
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dialer.TLSConfig = &tls.Config{
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ServerName: c.cfg.Host,
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InsecureSkipVerify: c.cfg.InsecureSkipVerify,
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}
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// 465 端口通常要求直接 TLS（Implicit TLS）。
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if c.cfg.Port == 465 {
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dialer.SSL = true
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}
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}
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sendCtx := ctx
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cancel := func() {}
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if timeout > 0 {
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sendCtx, cancel = context.WithTimeout(ctx, time.Duration(timeout)*time.Second)
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}
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defer cancel()
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done := make(chan error, 1)
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go func() {
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done <- dialer.DialAndSend(m)
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}()
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select {
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case <-sendCtx.Done():
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return fmt.Errorf("send email canceled: %w", sendCtx.Err())
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case err := <-done:
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if err != nil {
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return fmt.Errorf("send email failed: %w", err)
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}
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return nil
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}
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}
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