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notification.go
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notification.go
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// Copyright 2023 Tomas Machalek <tomas.machalek@gmail.com>
// Copyright 2023 Martin Zimandl <martin.zimandl@gmail.com>
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package mail
import (
"bytes"
"fmt"
"net/smtp"
"strings"
"github.com/czcorpus/cnc-gokit/datetime"
)
type NotificationConf struct {
Sender string `json:"sender"`
Receivers []string `json:"receivers"`
SMTPServer string `json:"smtpServer"`
SMTPUsername string `json:"smtpUsername"`
SMTPPassword string `json:"smtpPassword"`
// Signature defines multi-language signature for notification e-mails
Signature map[string]string `json:"signature"`
}
// SendNotification sends a general e-mail notification based on
// a respective monitoring configuration. The 'alarmToken' argument
// can be nil - in such case the 'turn of the alarm' text won't be
// part of the message.
func SendNotification(conf *NotificationConf, subject string, msgParagraphs ...string) error {
client, err := smtp.Dial(conf.SMTPServer)
if err != nil {
return err
}
defer client.Close()
client.Mail(conf.Sender)
for _, rcpt := range conf.Receivers {
client.Rcpt(rcpt)
}
wc, err := client.Data()
if err != nil {
return err
}
defer wc.Close()
headers := make(map[string]string)
headers["From"] = conf.Sender
headers["To"] = strings.Join(conf.Receivers, ",")
headers["Subject"] = subject
headers["MIME-Version"] = "1.0"
headers["Content-Type"] = "text/html; charset=UTF-8"
body := ""
for k, v := range headers {
body += fmt.Sprintf("%s: %s\r\n", k, v)
}
for _, par := range msgParagraphs {
body += "<p>" + par + "</p>\r\n\r\n"
}
body += fmt.Sprintf("<p>Generated at %s</p>\r\n\r\n", datetime.GetCurrentDatetime())
buf := bytes.NewBufferString(body)
_, err = buf.WriteTo(wc)
return err
}