snapshot of https://github.com/cortezaproject/corteza.git (2024.9.x, 2026-09-18; blobs > 131072B omitted)

server/pkg/mail/mail.go

@@ -0,0 +1,110 @@
+package mail
+
+import (
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+
+	gomail "gopkg.in/mail.v2"
+)
+
+type (
+	Dialer interface {
+		DialAndSend(...*gomail.Message) error
+	}
+
+	applyCfg func(*gomail.Dialer)
+)
+
+const (
+	addressCheckRE = "^[a-zA-Z0-9.!#$%&'*+/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$"
+)
+
+var (
+	addressCheck       *regexp.Regexp
+	defaultDialer      Dialer
+	defaultFrom        string
+	defaultDialerError error
+)
+
+func init() {
+	addressCheck = regexp.MustCompile(addressCheckRE)
+}
+
+// SetupDialer setups SMTP dialer
+//
+// Host variable can contain "<host>:<port>" that will override port value
+func SetupDialer(host string, port int, user, pass, from string, ff ...applyCfg) {
+	if host == "" {
+		defaultDialerError = fmt.Errorf("no hostname provided for SMTP")
+		return
+	}
+
+	if strings.Contains(host, ":") {
+		parts := strings.SplitN(host, ":", 2)
+		port, _ = strconv.Atoi(parts[1])
+		host = parts[0]
+	}
+
+	if port == 0 {
+		defaultDialerError = fmt.Errorf("no port provided for SMTP")
+		return
+	}
+
+	if from == "" {
+		from = "placeholder@example.net"
+	}
+
+	if defaultDialerError != nil {
+		return
+	}
+
+	defaultFrom = from
+	dialer := gomail.NewDialer(
+		host,
+		port,
+		user,
+		pass,
+	)
+
+	for _, fn := range ff {
+		fn(dialer)
+	}
+
+	defaultDialer = dialer
+}
+
+func New() *gomail.Message {
+	message := gomail.NewMessage()
+	message.SetHeader("From", defaultFrom)
+	return message
+}
+
+// Send message with SMTP dialer
+func Send(message *gomail.Message, dd ...Dialer) (err error) {
+	for _, d := range append(dd, defaultDialer) {
+		if d == nil {
+			continue
+		}
+
+		if err = d.DialAndSend(message); err != nil {
+			return fmt.Errorf("could not send email: %w", err)
+		} else {
+			return nil
+		}
+	}
+
+	// At this point, none of the dialer could be used,
+	// is there an error with default dialer?
+	if defaultDialerError != nil {
+		return fmt.Errorf("could not send email: %w", defaultDialerError)
+	}
+
+	return fmt.Errorf("unable to find configured and working SMTP dialer")
+
+}
+
+func IsValidAddress(addr string) bool {
+	return addressCheck.MatchString(addr)
+}