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388 lines
9.9 KiB
Go
388 lines
9.9 KiB
Go
/*
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Copyright 2017-2022 CAcert Inc.
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SPDX-License-Identifier: Apache-2.0
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package notifications
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import (
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"bytes"
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"fmt"
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"log"
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"net"
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"os"
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"path"
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"text/template"
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"time"
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"github.com/Masterminds/sprig/v3"
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"gopkg.in/mail.v2"
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"git.cacert.org/cacert-boardvoting/internal"
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"git.cacert.org/cacert-boardvoting/internal/models"
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)
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type MailConfig struct {
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SMTPHost string `yaml:"smtp_host"`
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SMTPPort int `yaml:"smtp_port"`
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SMTPTimeOut time.Duration `yaml:"smtp_timeout,omitempty"`
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NotificationSenderAddress string `yaml:"notification_sender_address"`
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NoticeMailAddress string `yaml:"notice_mail_address"`
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VoteNoticeMailAddress string `yaml:"vote_notice_mail_address"`
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BaseURL string `yaml:"base_url"`
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}
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type recipientData struct {
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field, address, name string
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}
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type NotificationContent struct {
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template string
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data interface{}
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subject string
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headers map[string][]string
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recipients []recipientData
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}
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type NotificationMail interface {
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GetNotificationContent(*MailConfig) *NotificationContent
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}
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type MailNotifier struct {
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notifyChannel chan NotificationMail
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senderAddress string
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dialer *mail.Dialer
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quitChannel chan struct{}
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infoLog, errorLog *log.Logger
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mailConfig *MailConfig
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}
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type Option func(*MailNotifier)
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func NewMailNotifier(config *MailConfig, opts ...Option) *MailNotifier {
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n := &MailNotifier{
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notifyChannel: make(chan NotificationMail, 1),
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senderAddress: config.NotificationSenderAddress,
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dialer: mail.NewDialer(config.SMTPHost, config.SMTPPort, "", ""),
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quitChannel: make(chan struct{}),
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infoLog: log.New(os.Stdout, "", 0),
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errorLog: log.New(os.Stderr, "", 0),
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mailConfig: config,
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}
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for _, o := range opts {
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o(n)
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}
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return n
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}
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func NotifierLog(infoLog, errorLog *log.Logger) Option {
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return func(n *MailNotifier) {
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n.infoLog = infoLog
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n.errorLog = errorLog
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}
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}
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func (mn *MailNotifier) Start() {
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mn.infoLog.Print("Launching mail notifier")
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for {
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select {
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case notification := <-mn.notifyChannel:
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content := notification.GetNotificationContent(mn.mailConfig)
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mailText, err := content.buildMail(mn.mailConfig.BaseURL)
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if err != nil {
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mn.errorLog.Printf("building mail failed: %v", err)
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continue
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}
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m := mail.NewMessage()
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m.SetHeaders(content.headers)
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m.SetAddressHeader("From", mn.senderAddress, "CAcert board voting system")
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for _, recipient := range content.recipients {
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m.SetAddressHeader(recipient.field, recipient.address, recipient.name)
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}
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m.SetHeader("Subject", content.subject)
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m.SetBody("text/plain", mailText.String())
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if err = mn.dialer.DialAndSend(m); err != nil {
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mn.errorLog.Printf("sending mail failed: %v", err)
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}
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case <-mn.quitChannel:
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mn.infoLog.Print("ending mail notifier")
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return
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}
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}
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}
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func (mn *MailNotifier) Quit() {
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mn.quitChannel <- struct{}{}
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}
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func (mn *MailNotifier) Notify(w NotificationMail) {
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mn.notifyChannel <- w
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}
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func (mn *MailNotifier) Ping() error {
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conn, err := net.DialTimeout(
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"tcp",
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fmt.Sprintf("%s:%d", mn.mailConfig.SMTPHost, mn.mailConfig.SMTPPort),
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mn.mailConfig.SMTPTimeOut,
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)
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if err != nil {
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return fmt.Errorf("could not connect to SMTP server: %w", err)
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}
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defer func(conn net.Conn) {
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_ = conn.Close()
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}(conn)
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return nil
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}
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func (n *NotificationContent) buildMail(baseURL string) (fmt.Stringer, error) {
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// TODO: implement a template cache for mail templates too
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b, err := internal.MailTemplates.ReadFile(path.Join("mailtemplates", n.template))
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if err != nil {
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return nil, fmt.Errorf("could not read mail template %s: %w", n.template, err)
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}
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t, err := template.New(n.template).Funcs(sprig.GenericFuncMap()).Parse(string(b))
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if err != nil {
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return nil, fmt.Errorf("could not parse mail template %s: %w", n.template, err)
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}
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data := struct {
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Data any
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BaseURL string
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}{Data: n.data, BaseURL: baseURL}
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mailText := bytes.NewBuffer(make([]byte, 0))
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if err = t.Execute(mailText, data); err != nil {
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return nil, fmt.Errorf(
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"failed to execute template %s with context %v: %w", n.template, n.data, err)
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}
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return mailText, nil
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}
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func defaultRecipient(mc *MailConfig) recipientData {
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return recipientData{
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field: "To",
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address: mc.NoticeMailAddress,
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name: "CAcert board mailing list",
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}
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}
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func voteNoticeRecipient(mc *MailConfig) recipientData {
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return recipientData{
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field: "To",
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address: mc.VoteNoticeMailAddress,
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name: "CAcert board votes mailing list",
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}
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}
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func motionReplyHeaders(m *models.Motion) map[string][]string {
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return map[string][]string{
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"References": {fmt.Sprintf("<%s>", m.Tag)},
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"In-Reply-To": {fmt.Sprintf("<%s>", m.Tag)},
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}
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}
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type RemindVoterNotification struct {
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Voter *models.User
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Decisions []*models.Motion
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}
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func (r RemindVoterNotification) GetNotificationContent(*MailConfig) *NotificationContent {
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recipientAddress := make([]recipientData, 0)
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if r.Voter.Reminder.Valid {
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recipientAddress = append(recipientAddress, recipientData{
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field: "To",
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address: r.Voter.Reminder.String,
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name: r.Voter.Name,
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})
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}
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return &NotificationContent{
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template: "remind_voter_mail.txt",
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data: struct {
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Decisions []*models.Motion
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Name string
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}{Decisions: r.Decisions, Name: r.Voter.Name},
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subject: "Outstanding CAcert board votes",
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recipients: recipientAddress,
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}
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}
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type ClosedDecisionNotification struct {
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Decision *models.Motion
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}
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func (c *ClosedDecisionNotification) GetNotificationContent(mc *MailConfig) *NotificationContent {
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return &NotificationContent{
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template: "closed_motion_mail.txt",
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data: struct {
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*models.Motion
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}{Motion: c.Decision},
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subject: fmt.Sprintf("Re: %s - %s - finalized", c.Decision.Tag, c.Decision.Title),
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headers: motionReplyHeaders(c.Decision),
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recipients: []recipientData{defaultRecipient(mc)},
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}
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}
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type NewDecisionNotification struct {
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Decision *models.Motion
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Proposer *models.User
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}
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func (n NewDecisionNotification) GetNotificationContent(mc *MailConfig) *NotificationContent {
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voteURL := fmt.Sprintf("/vote/%s", n.Decision.Tag)
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unvotedURL := "/motions/?unvoted=1"
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return &NotificationContent{
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template: "create_motion_mail.txt",
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data: struct {
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*models.Motion
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Name string
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VoteURL string
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UnvotedURL string
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}{
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Motion: n.Decision,
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Name: n.Proposer.Name,
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VoteURL: voteURL,
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UnvotedURL: unvotedURL,
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},
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subject: fmt.Sprintf("%s - %s", n.Decision.Tag, n.Decision.Title),
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headers: n.getHeaders(),
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recipients: []recipientData{defaultRecipient(mc)},
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}
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}
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func (n NewDecisionNotification) getHeaders() map[string][]string {
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return map[string][]string{
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"Message-ID": {fmt.Sprintf("<%s>", n.Decision.Tag)},
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}
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}
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type UpdateDecisionNotification struct {
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Decision *models.Motion
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User *models.User
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}
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func (u UpdateDecisionNotification) GetNotificationContent(mc *MailConfig) *NotificationContent {
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voteURL := fmt.Sprintf("/vote/%s", u.Decision.Tag)
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unvotedURL := "/motions/?unvoted=1"
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return &NotificationContent{
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template: "update_motion_mail.txt",
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data: struct {
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*models.Motion
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Name string
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VoteURL string
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UnvotedURL string
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}{
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Motion: u.Decision,
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Name: u.User.Name,
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VoteURL: voteURL,
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UnvotedURL: unvotedURL,
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},
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subject: fmt.Sprintf("%s - %s", u.Decision.Tag, u.Decision.Title),
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headers: motionReplyHeaders(u.Decision),
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recipients: []recipientData{defaultRecipient(mc)},
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}
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}
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type DirectVoteNotification struct {
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Decision *models.Motion
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User *models.User
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Choice *models.VoteChoice
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}
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func (d DirectVoteNotification) GetNotificationContent(mc *MailConfig) *NotificationContent {
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return &NotificationContent{
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template: "direct_vote_mail.txt",
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data: struct {
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*models.Motion
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Name string
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Choice *models.VoteChoice
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}{
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Motion: d.Decision,
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Name: d.User.Name,
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Choice: d.Choice,
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},
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subject: fmt.Sprintf("Re: %s - %s", d.Decision.Tag, d.Decision.Title),
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headers: motionReplyHeaders(d.Decision),
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recipients: []recipientData{voteNoticeRecipient(mc)},
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}
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}
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type ProxyVoteNotification struct {
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Decision *models.Motion
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User *models.User
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Voter *models.User
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Choice *models.VoteChoice
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Justification string
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}
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func (p ProxyVoteNotification) GetNotificationContent(mc *MailConfig) *NotificationContent {
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return &NotificationContent{
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template: "proxy_vote_mail.txt",
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data: struct {
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*models.Motion
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Name string
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Voter string
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Choice *models.VoteChoice
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Justification string
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}{
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Motion: p.Decision,
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Name: p.User.Name,
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Voter: p.Voter.Name,
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Choice: p.Choice,
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Justification: p.Justification,
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},
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subject: fmt.Sprintf("Re: %s - %s", p.Decision.Tag, p.Decision.Title),
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headers: motionReplyHeaders(p.Decision),
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recipients: []recipientData{voteNoticeRecipient(mc)},
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}
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}
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type WithDrawMotionNotification struct {
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Motion *models.Motion
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Voter *models.User
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}
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func (w WithDrawMotionNotification) GetNotificationContent(mc *MailConfig) *NotificationContent {
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return &NotificationContent{
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template: "withdraw_motion_mail.txt",
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data: struct {
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*models.Motion
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Name string
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}{Motion: w.Motion, Name: w.Voter.Name},
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subject: fmt.Sprintf("Re: %s - %s", w.Motion.Tag, w.Motion.Title),
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headers: motionReplyHeaders(w.Motion),
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recipients: []recipientData{defaultRecipient(mc)},
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}
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}
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