go-mockid/cmd/mailer/mailer.go

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package main
import (
"context"
"flag"
"fmt"
"os"
"time"
mailgun "github.com/mailgun/mailgun-go/v3"
_ "github.com/joho/godotenv/autoload"
)
func main() {
/*
MAILGUN_API_KEY=key-xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
MAILGUN_DOMAIN=mail.example.com
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MAILER_FROM="Rob the Robot <rob.the.robot@mail.example.com>"
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*/
to := flag.String("to", "", "message recipient in the format of 'John Doe <john@example.com>'")
replyTo := flag.String("reply-to", "", "reply-to in the format of 'John Doe <john@example.com>'")
subject := flag.String("subject", "Test Subject", "the utf8-encoded subject of the email")
text := flag.String(
"text",
"Testing some Mailgun awesomeness!",
"the body of the email as utf8-encoded plain-text format",
)
flag.Parse()
if 0 == len(*to) {
flag.Usage()
os.Exit(1)
}
domain := os.Getenv("MAILGUN_DOMAIN")
apiKey := os.Getenv("MAILGUN_API_KEY")
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from := os.Getenv("MAILER_FROM")
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if 0 == len(*text) {
*text = "Testing some Mailgun awesomeness!"
}
msgId, err := SendSimpleMessage(domain, apiKey, *to, from, *subject, *text, *replyTo)
if nil != err {
panic(err)
}
fmt.Printf("Queued with Message ID %q\n", msgId)
}
func SendSimpleMessage(domain, apiKey, to, from, subject, text, replyTo string) (string, error) {
mg := mailgun.NewMailgun(domain, apiKey)
m := mg.NewMessage(from, subject, text, to)
if 0 != len(replyTo) {
// mailgun's required "h:" prefix is added by the library
m.AddHeader("Reply-To", replyTo)
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second*30)
defer cancel()
_, id, err := mg.Send(ctx, m)
return id, err
}