From 71937c1079a77e0b38dae00662ab2041c3e28f77 Mon Sep 17 00:00:00 2001
From: Thomas Voss <mail@thomasvoss.com>
Date: Mon, 12 Aug 2024 23:58:46 +0200
Subject: Add email support

---
 lib/email/email.go | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 lib/email/email.go

(limited to 'lib')

diff --git a/lib/email/email.go b/lib/email/email.go
new file mode 100644
index 0000000..f6d6673
--- /dev/null
+++ b/lib/email/email.go
@@ -0,0 +1,75 @@
+package email
+
+import (
+	"crypto/tls"
+	"fmt"
+	"math/rand"
+	"net/smtp"
+	"strconv"
+	"time"
+)
+
+var Config struct {
+	Host             string
+	Port             int
+	ToAddr, FromAddr string
+	Password         string
+}
+
+const emailTemplate = `From: %s
+To: %s
+Subject: %s
+Date: %s
+Content-Type: text/plain; charset=UTF-8
+MIME-Version: 1.0
+Message-ID: <%s>
+
+%s`
+
+func ServerError(fault error) error {
+	r := rand.New(rand.NewSource(time.Now().UnixNano()))
+	msgid := strconv.FormatInt(r.Int63(), 10) + "@" + Config.Host
+	msg := fmt.Sprintf(emailTemplate, Config.FromAddr, Config.ToAddr,
+		"Error Report", time.Now().Format(time.RFC1123Z), msgid, fault)
+
+	tlsConfig := &tls.Config{
+		InsecureSkipVerify: false,
+		ServerName:         Config.Host,
+	}
+
+	hostWithPort := Config.Host + ":" + strconv.Itoa(Config.Port)
+	conn, err := tls.Dial("tcp", hostWithPort, tlsConfig)
+	if err != nil {
+		return err
+	}
+
+	client, err := smtp.NewClient(conn, Config.Host)
+	if err != nil {
+		return err
+	}
+	defer client.Close()
+
+	auth := smtp.PlainAuth("", Config.FromAddr, Config.Password, Config.Host)
+	if err := client.Auth(auth); err != nil {
+		return err
+	}
+
+	if err := client.Mail(Config.FromAddr); err != nil {
+		return err
+	}
+
+	if err := client.Rcpt(Config.ToAddr); err != nil {
+		return err
+	}
+
+	wc, err := client.Data()
+	if err != nil {
+		return err
+	}
+	defer wc.Close()
+
+	if _, err = wc.Write([]byte(msg)); err != nil {
+		return err
+	}
+	return nil
+}
-- 
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