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main.go
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package main
import (
"flag"
"fmt"
"html/template"
"log"
"net/http"
"net/url"
"os"
"strconv"
"time"
"github.com/wneessen/go-mail"
)
var indexTemplate = template.Must(template.New("Index").Parse(`<!DOCTYPE html>
<html>
<head>
<title>use-go-mail</title>
<style>
body {
font-family: monospace;
color: #555;
background: #e6edf4;
padding: 1.25rem;
margin: 0;
}
label {
display: inline-block;
margin-bottom: 0.5em;
min-width: 6em;
}
input[type="text"], input[type="password"] {
min-width: 18em;
}
.error {
color: red;
}
</style>
</head>
<body>
<form method="post">
<div>
<label for="address">Address:</label>
<input type="text" id="address" name="address" value="{{.Address}}" required>
</div>
<div>
<label for="username">Username:</label>
<input type="text" id="username" name="username" value="{{.Username}}" required>
</div>
<div>
<label for="password">Password:</label>
<input type="password" id="password" name="password" value="{{.Password}}" required>
</div>
<div>
<label for="from">From:</label>
<input type="text" id="from" name="from" value="{{.From}}" required>
</div>
<div>
<label for="to">To:</label>
<input type="text" id="to" name="to" value="{{.To}}" required>
</div>
<div>
<input type="submit" value="Send Mail">
{{if .Error}}<span class="error">{{.Error}}</span>{{end}}
{{if .Status}}<span>{{.Status}}</span>{{end}}
</div>
</form>
</body>
</html>
`))
type indexData struct {
Address string
Username string
Password string
From string
To string
Error string
Status string
}
func parseAddress(addr string) (tls bool, hostname string, port int, err error) {
u, err := url.Parse(addr)
if err != nil {
return false, "", 0, fmt.Errorf("invalid address: %w", err)
}
if u.Scheme != "smtp" && u.Scheme != "smtps" {
return false, "", 0, fmt.Errorf("invalid address scheme: %v", u.Scheme)
}
tls = u.Scheme != "smtp"
hostname = u.Hostname()
if u.Port() == "" {
if tls {
port = mail.DefaultPortSSL
} else {
port = mail.DefaultPort
}
} else {
port, err = strconv.Atoi(u.Port())
if err != nil {
return false, "", 0, fmt.Errorf("invalid port: %w", err)
}
}
return
}
func sendMail(addr string, username string, password string, from string, to string, subject string, body string) (string, error) {
tls, hostname, port, err := parseAddress(addr)
if err != nil {
return "", err
}
options := []mail.Option{
mail.WithUsername(username),
mail.WithPassword(password),
}
if tls {
options = append(options,
mail.WithTLSPortPolicy(mail.TLSMandatory),
mail.WithSSLPort(false),
mail.WithPort(port),
)
} else {
options = append(options,
mail.WithTLSPortPolicy(mail.NoTLS),
mail.WithPort(port),
)
}
client, err := mail.NewClient(hostname, options...)
if err != nil {
return "", err
}
m := mail.NewMsg()
if err := m.From(from); err != nil {
return "", fmt.Errorf("failed to set FROM address: %w", err)
}
if err := m.To(to); err != nil {
return "", fmt.Errorf("failed to set TO address: %w", err)
}
m.Subject(subject)
m.SetBodyString(mail.TypeTextPlain, body)
if err := client.DialAndSend(m); err != nil {
return "", fmt.Errorf("failed to send mail: %w", err)
}
return fmt.Sprintf("Successfully sent mail: %s", subject), nil
}
func stringOrDefault(value string, defaultValue string) string {
if value != "" {
return value
}
return defaultValue
}
func main() {
log.SetFlags(0)
var listenAddress = flag.String("listen", ":8000", "Listen address.")
flag.Parse()
if flag.NArg() != 0 {
flag.Usage()
log.Fatalf("\nERROR You MUST NOT pass any positional arguments")
}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
fmt.Printf("%s %s%s\n", r.Method, r.Host, r.URL)
if r.URL.Path != "/" {
http.Error(w, "Not Found", http.StatusNotFound)
return
}
data := indexData{
Address: os.Getenv("MAIL_SERVER_ADDR"),
Username: "use-go-mail@localhost",
Password: "password",
From: "use-go-mail@localhost",
To: "use-go-mail@localhost",
}
if r.Method == http.MethodPost {
data.Address = stringOrDefault(r.PostFormValue("address"), data.Address)
data.Username = stringOrDefault(r.PostFormValue("username"), data.Username)
data.Password = stringOrDefault(r.PostFormValue("password"), data.Password)
data.From = stringOrDefault(r.PostFormValue("from"), data.From)
data.To = stringOrDefault(r.PostFormValue("to"), data.To)
status, err := sendMail(
data.Address,
data.Username,
data.Password,
data.From,
data.To,
fmt.Sprintf("use-go-mail %s", time.Now().Format("2006-01-02T15:04:05.000000Z07:00")),
"Hello, World!")
if err != nil {
data.Error = err.Error()
}
data.Status = status
}
w.Header().Set("Content-Type", "text/html")
err := indexTemplate.ExecuteTemplate(w, "Index", data)
if err != nil {
http.Error(w, err.Error(), http.StatusInternalServerError)
return
}
})
fmt.Printf("Listening at http://%s\n", *listenAddress)
err := http.ListenAndServe(*listenAddress, nil)
if err != nil {
log.Fatalf("Failed to ListenAndServe: %v", err)
}
}