egutierrez
53deb8e9a8
Tipos: EmailAttachment, EmailMessage, SMTPConfig. Puras: email_build_html, email_build_text, email_with_attachment, email_template_render. Impuras: smtp_connect (TLS/STARTTLS/plain), smtp_send (MIME multipart con adjuntos). Solo stdlib: net/smtp, crypto/tls, text/template, mime/multipart. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
82 lines
2.3 KiB
Go
82 lines
2.3 KiB
Go
package infra
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import (
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"crypto/tls"
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"fmt"
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"net"
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"net/smtp"
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)
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// SMTPConnect establishes an authenticated SMTP connection using the given config.
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// TLSMode controls encryption:
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// - "tls" → direct TLS (typical port 465)
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// - "starttls" → plain connection upgraded with STARTTLS (typical port 587)
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// - "" → no encryption (typical port 25)
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//
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// Returns an *smtp.Client ready to use with SMTPSend.
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// The caller is responsible for calling client.Quit() when done.
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func SMTPConnect(cfg SMTPConfig) (*smtp.Client, error) {
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addr := fmt.Sprintf("%s:%d", cfg.Host, cfg.Port)
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switch cfg.TLSMode {
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case "tls":
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tlsCfg := &tls.Config{ServerName: cfg.Host}
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conn, err := tls.Dial("tcp", addr, tlsCfg)
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if err != nil {
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return nil, fmt.Errorf("smtp_connect: tls dial %s: %w", addr, err)
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}
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client, err := smtp.NewClient(conn, cfg.Host)
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if err != nil {
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conn.Close()
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return nil, fmt.Errorf("smtp_connect: new client: %w", err)
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}
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if cfg.Username != "" {
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auth := smtp.PlainAuth("", cfg.Username, cfg.Password, cfg.Host)
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if err := client.Auth(auth); err != nil {
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client.Close()
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return nil, fmt.Errorf("smtp_connect: auth: %w", err)
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}
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}
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return client, nil
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case "starttls":
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conn, err := net.Dial("tcp", addr)
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if err != nil {
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return nil, fmt.Errorf("smtp_connect: dial %s: %w", addr, err)
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}
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client, err := smtp.NewClient(conn, cfg.Host)
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if err != nil {
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conn.Close()
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return nil, fmt.Errorf("smtp_connect: new client: %w", err)
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}
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tlsCfg := &tls.Config{ServerName: cfg.Host}
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if err := client.StartTLS(tlsCfg); err != nil {
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client.Close()
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return nil, fmt.Errorf("smtp_connect: starttls: %w", err)
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}
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if cfg.Username != "" {
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auth := smtp.PlainAuth("", cfg.Username, cfg.Password, cfg.Host)
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if err := client.Auth(auth); err != nil {
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client.Close()
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return nil, fmt.Errorf("smtp_connect: auth: %w", err)
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}
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}
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return client, nil
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default:
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// no encryption
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client, err := smtp.Dial(addr)
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if err != nil {
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return nil, fmt.Errorf("smtp_connect: dial %s: %w", addr, err)
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}
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if cfg.Username != "" {
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auth := smtp.PlainAuth("", cfg.Username, cfg.Password, cfg.Host)
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if err := client.Auth(auth); err != nil {
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client.Close()
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return nil, fmt.Errorf("smtp_connect: auth: %w", err)
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}
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}
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return client, nil
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}
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}
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