cacert-boardvoting/cmd/boardvoting/notifications.go

173 lines
4.7 KiB
Go

/*
Copyright 2022 CAcert Inc.
SPDX-License-Identifier: Apache-2.0
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 main
import (
"bytes"
"fmt"
"path"
"text/template"
"github.com/Masterminds/sprig/v3"
"gopkg.in/mail.v2"
"git.cacert.org/cacert-boardvoting/internal"
"git.cacert.org/cacert-boardvoting/internal/models"
)
type recipientData struct {
field, address, name string
}
type NotificationContent struct {
template string
data interface{}
subject string
headers map[string][]string
recipients []recipientData
}
type NotificationMail interface {
GetNotificationContent(*mailConfig) *NotificationContent
}
type MailNotifier struct {
notifyChannel chan NotificationMail
senderAddress string
dialer *mail.Dialer
quitChannel chan struct{}
}
func (app *application) NewMailNotifier() {
app.mailNotifier = &MailNotifier{
notifyChannel: make(chan NotificationMail, 1),
senderAddress: app.mailConfig.NotificationSenderAddress,
dialer: mail.NewDialer(app.mailConfig.SMTPHost, app.mailConfig.SMTPPort, "", ""),
quitChannel: make(chan struct{}),
}
}
func (app *application) StartMailNotifier() {
app.infoLog.Print("Launching mail notifier")
for {
select {
case notification := <-app.mailNotifier.notifyChannel:
content := notification.GetNotificationContent(app.mailConfig)
mailText, err := content.buildMail(app.baseURL)
if err != nil {
app.errorLog.Printf("building mail failed: %v", err)
continue
}
m := mail.NewMessage()
m.SetHeaders(content.headers)
m.SetAddressHeader("From", app.mailNotifier.senderAddress, "CAcert board voting system")
for _, recipient := range content.recipients {
m.SetAddressHeader(recipient.field, recipient.address, recipient.name)
}
m.SetHeader("Subject", content.subject)
m.SetBody("text/plain", mailText.String())
if err = app.mailNotifier.dialer.DialAndSend(m); err != nil {
app.errorLog.Printf("sending mail failed: %v", err)
}
case <-app.mailNotifier.quitChannel:
app.infoLog.Print("ending mail notifier")
return
}
}
}
func (m *MailNotifier) Quit() {
m.quitChannel <- struct{}{}
}
func (n *NotificationContent) buildMail(baseURL string) (fmt.Stringer, error) {
b, err := internal.MailTemplates.ReadFile(path.Join("mailtemplates", n.template))
if err != nil {
return nil, fmt.Errorf("could not read mail template %s: %w", n.template, err)
}
t, err := template.New(n.template).Funcs(sprig.GenericFuncMap()).Parse(string(b))
if err != nil {
return nil, fmt.Errorf("could not parse mail template %s: %w", n.template, err)
}
data := struct {
Data any
BaseURL string
}{Data: n.data, BaseURL: baseURL}
mailText := bytes.NewBuffer(make([]byte, 0))
if err = t.Execute(mailText, data); err != nil {
return nil, fmt.Errorf(
"failed to execute template %s with context %v: %w", n.template, n.data, err)
}
return mailText, nil
}
type RemindVoterNotification struct {
voter models.Voter
decisions []models.Decision
}
func (r RemindVoterNotification) GetNotificationContent(*mailConfig) *NotificationContent {
return &NotificationContent{
template: "remind_voter_mail.txt",
data: struct {
Decisions []models.Decision
Name string
}{Decisions: r.decisions, Name: r.voter.Name},
subject: "Outstanding CAcert board votes",
recipients: []recipientData{{"To", r.voter.Reminder, r.voter.Name}},
}
}
type ClosedDecisionNotification struct {
decision *models.ClosedDecision
}
func (c *ClosedDecisionNotification) GetNotificationContent(mc *mailConfig) *NotificationContent {
return &NotificationContent{
template: "closed_motion_mail.txt",
data: c.decision,
subject: fmt.Sprintf("Re: %s - %s - finalised", c.decision.Decision.Tag, c.decision.Decision.Title),
headers: c.getHeaders(),
recipients: []recipientData{c.getRecipient(mc)},
}
}
func (c *ClosedDecisionNotification) getHeaders() map[string][]string {
return map[string][]string{
"References": {fmt.Sprintf("<%s>", c.decision.Decision.Tag)},
"In-Reply-To": {fmt.Sprintf("<%s>", c.decision.Decision.Tag)},
}
}
func (c *ClosedDecisionNotification) getRecipient(mc *mailConfig) recipientData {
return recipientData{field: "To", address: mc.NoticeMailAddress, name: "CAcert board mailing list"}
}