feat: subscription expiry notification mails

config.default.yml

@@ -1,4 +1,6 @@
 env: production
+quick_start: false                  # whether to skip initial tasks on application startup, like summary generation
+skip_migrations: false              # whether to intentionally not run database migrations, only use for dev purposes
 
 server:
   listen_ipv4: 127.0.0.1              # leave blank to disable ipv4
@@ -44,7 +46,7 @@ db:
   charset: utf8mb4                    # only used for mysql connections
   max_conn: 2                         # maximum number of concurrent connections to maintain
   ssl: false                          # whether to use tls for db connection (must be true for cockroachdb) (ignored for mysql and sqlite)
-  automgirate_fail_silently: false    # whether to ignore schema auto-migration failures when starting up
+  automigrate_fail_silently: false    # whether to ignore schema auto-migration failures when starting up
 
 security:
   password_salt:                      # change this
@@ -60,6 +62,14 @@ sentry:
   sample_rate: 0.75                   # probability of tracing a request
   sample_rate_heartbeats: 0.1         # probability of tracing a heartbeat request
 
+# only relevant for running wakapi as a hosted service with paid subscriptions and stripe payments
+subscriptions:
+  enabled: false
+  stripe_api_key:
+  stripe_secret_key:
+  stripe_endpoint_secret:
+  standard_price_id:
+
 mail:
   enabled: true                         # whether to enable mails (used for password resets, reports, etc.)
   provider: smtp                        # method for sending mails, currently one of ['smtp', 'mailwhale']
@@ -77,7 +87,4 @@ mail:
   mailwhale:
     url:
     client_id:
-    client_secret:
+    client_secret:
-
-quick_start: false                  # whether to skip initial tasks on application startup, like summary generation
-skip_migrations: false              # whether to intentionally not run database migrations, only use for dev purposes

config/config.go

@@ -4,6 +4,7 @@ import (
 	"encoding/json"
 	"flag"
 	"fmt"
+	"github.com/robfig/cron/v3"
 	"io/ioutil"
 	"net/http"
 	"regexp"
@@ -11,13 +12,11 @@ import (
 	"strings"
 	"time"
 
-	"github.com/muety/wakapi/utils"
-	"github.com/robfig/cron/v3"
-
 	"github.com/emvi/logbuch"
 	"github.com/gorilla/securecookie"
 	"github.com/jinzhu/configor"
 	"github.com/muety/wakapi/data"
+	"github.com/muety/wakapi/utils"
 	uuid "github.com/satori/go.uuid"
 )
 
@@ -28,11 +27,12 @@ const (
 	SQLDialectPostgres = "postgres"
 	SQLDialectSqlite   = "sqlite3"
 
-	KeyLatestTotalTime  = "latest_total_time"
+	KeyLatestTotalTime              = "latest_total_time"
-	KeyLatestTotalUsers = "latest_total_users"
+	KeyLatestTotalUsers             = "latest_total_users"
-	KeyLastImportImport = "last_import"
+	KeyLastImportImport             = "last_import"
-	KeyFirstHeartbeat   = "first_heartbeat"
+	KeyFirstHeartbeat               = "first_heartbeat"
-	KeyNewsbox          = "newsbox"
+	KeySubscriptionNotificationSent = "sub_reminder"
+	KeyNewsbox                      = "newsbox"
 
 	SimpleDateFormat     = "2006-01-02"
 	SimpleDateTimeFormat = "2006-01-02 15:04:05"
@@ -124,6 +124,7 @@ type serverConfig struct {
 
 type subscriptionsConfig struct {
 	Enabled              bool   `yaml:"enabled" default:"false" env:"WAKAPI_SUBSCRIPTIONS_ENABLED"`
+	ExpiryNotifications  bool   `yaml:"expiry_notifications" default:"true" env:"WAKAPI_SUBSCRIPTIONS_EXPIRY_NOTIFICATIONS"`
 	StripeApiKey         string `yaml:"stripe_api_key" env:"WAKAPI_SUBSCRIPTIONS_STRIPE_API_KEY"`
 	StripeSecretKey      string `yaml:"stripe_secret_key" env:"WAKAPI_SUBSCRIPTIONS_STRIPE_SECRET_KEY"`
 	StripeEndpointSecret string `yaml:"stripe_endpoint_secret" env:"WAKAPI_SUBSCRIPTIONS_STRIPE_ENDPOINT_SECRET"`
@@ -412,7 +413,11 @@ func Load(version string) *Config {
 	if config.App.DataRetentionMonths <= 0 {
 		logbuch.Info("disabling data retention policy, keeping data forever")
 	} else {
-		logbuch.Info("data retention policy set to keep data for %d months at max", config.App.DataRetentionMonths)
+		dataRetentionWarning := fmt.Sprintf("⚠️ data retention policy will cause user data older than %d months to be deleted", config.App.DataRetentionMonths)
+		if config.Subscriptions.Enabled {
+			dataRetentionWarning += " (except for users with active subscriptions)"
+		}
+		logbuch.Warn(dataRetentionWarning)
 	}
 
 	// some validation checks

config/jobqueue.go

@@ -15,6 +15,7 @@ const (
 	QueueDefault      = "wakapi.default"
 	QueueProcessing   = "wakapi.processing"
 	QueueReports      = "wakapi.reports"
+	QueueMails        = "wakapi.mail"
 	QueueImports      = "wakapi.imports"
 	QueueHousekeeping = "wakapi.housekeeping"
 )
@@ -31,6 +32,7 @@ func init() {
 	InitQueue(QueueDefault, 1)
 	InitQueue(QueueProcessing, halfCPUs())
 	InitQueue(QueueReports, 1)
+	InitQueue(QueueMails, 1)
 	InitQueue(QueueImports, 1)
 	InitQueue(QueueHousekeeping, halfCPUs())
 }

main.go

@@ -183,7 +183,7 @@ func main() {
 	reportService = services.NewReportService(summaryService, userService, mailService)
 	diagnosticsService = services.NewDiagnosticsService(diagnosticsRepository)
 	housekeepingService = services.NewHousekeepingService(userService, heartbeatService, summaryService)
-	miscService = services.NewMiscService(userService, heartbeatService, summaryService, keyValueService)
+	miscService = services.NewMiscService(userService, heartbeatService, summaryService, keyValueService, mailService)
 
 	// Schedule background tasks
 	go aggregationService.Schedule()
@@ -216,7 +216,7 @@ func main() {
 	// MVC Handlers
 	summaryHandler := routes.NewSummaryHandler(summaryService, userService)
 	settingsHandler := routes.NewSettingsHandler(userService, heartbeatService, summaryService, aliasService, aggregationService, languageMappingService, projectLabelService, keyValueService, mailService)
-	subscriptionHandler := routes.NewSubscriptionHandler(userService, mailService)
+	subscriptionHandler := routes.NewSubscriptionHandler(userService, mailService, keyValueService)
 	leaderboardHandler := routes.NewLeaderboardHandler(userService, leaderboardService)
 	homeHandler := routes.NewHomeHandler(keyValueService)
 	loginHandler := routes.NewLoginHandler(userService, mailService)

models/user.go

@@ -135,6 +135,22 @@ func (u *User) HasActiveSubscriptionStrict() bool {
 	return u.SubscribedUntil != nil && u.SubscribedUntil.T().After(time.Now())
 }
 
+// SubscriptionExpiredSince returns if a user's subscription has expiration and the duration since when that happened.
+// Returns (false, <negative duration>), if subscription hasn't expired, yet.
+// Returns (false, 0), if subscriptions are not enabled in the first place.
+// Returns (true, <very long duration>), if the user has never had a subscription.
+func (u *User) SubscriptionExpiredSince() (bool, time.Duration) {
+	cfg := conf.Get()
+	if !cfg.Subscriptions.Enabled {
+		return false, 0
+	}
+	if u.SubscribedUntil == nil {
+		return true, 99 * 365 * 24 * time.Hour
+	}
+	diff := time.Now().Sub(u.SubscribedUntil.T())
+	return diff >= 0, diff
+}
+
 func (u *User) MinDataAge() time.Time {
 	retentionMonths := conf.Get().App.DataRetentionMonths
 	if retentionMonths <= 0 || u.HasActiveSubscription() {

routes/subscription.go

@@ -23,15 +23,17 @@ import (
 )
 
 type SubscriptionHandler struct {
-	config     *conf.Config
+	config       *conf.Config
-	userSrvc   services.IUserService
+	userSrvc     services.IUserService
-	mailSrvc   services.IMailService
+	mailSrvc     services.IMailService
-	httpClient *http.Client
+	keyValueSrvc services.IKeyValueService
+	httpClient   *http.Client
 }
 
 func NewSubscriptionHandler(
 	userService services.IUserService,
 	mailService services.IMailService,
+	keyValueService services.IKeyValueService,
 ) *SubscriptionHandler {
 	config := conf.Get()
 
@@ -48,10 +50,11 @@ func NewSubscriptionHandler(
 	}
 
 	return &SubscriptionHandler{
-		config:     config,
+		config:       config,
-		userSrvc:   userService,
+		userSrvc:     userService,
-		mailSrvc:   mailService,
+		mailSrvc:     mailService,
-		httpClient: &http.Client{Timeout: 10 * time.Second},
+		keyValueSrvc: keyValueService,
+		httpClient:   &http.Client{Timeout: 10 * time.Second},
 	}
 }
 
@@ -204,11 +207,14 @@ func (h *SubscriptionHandler) GetCheckoutCancel(w http.ResponseWriter, r *http.R
 }
 
 func (h *SubscriptionHandler) handleSubscriptionEvent(subscription *stripe.Subscription, user *models.User) error {
+	var hasSubscribed bool
+
 	switch subscription.Status {
 	case "active":
 		until := models.CustomTime(time.Unix(subscription.CurrentPeriodEnd, 0))
 
 		if user.SubscribedUntil == nil || !user.SubscribedUntil.T().Equal(until.T()) {
+			hasSubscribed = true
 			user.SubscribedUntil = &until
 			logbuch.Info("user %s got active subscription %s until %v", user.ID, subscription.ID, user.SubscribedUntil)
 		}
@@ -224,6 +230,9 @@ func (h *SubscriptionHandler) handleSubscriptionEvent(subscription *stripe.Subsc
 	}
 
 	_, err := h.userSrvc.Update(user)
+	if err == nil && hasSubscribed {
+		go h.clearSubscriptionNotificationStatus(user.ID)
+	}
 	return err
 }
 
@@ -265,3 +274,10 @@ func (h *SubscriptionHandler) findStripeCustomerByEmail(email string) (*stripe.C
 		return nil, errors.New("no customer found with given criteria")
 	}
 }
+
+func (h *SubscriptionHandler) clearSubscriptionNotificationStatus(userId string) {
+	key := fmt.Sprintf("%s_%s", conf.KeySubscriptionNotificationSent, userId)
+	if err := h.keyValueSrvc.DeleteString(key); err != nil {
+		conf.Log().Error("failed to delete '%s', %v", key, err)
+	}
+}

services/mail/mail.go

@@ -19,10 +19,12 @@ const (
 	tplNameImportNotification          = "import_finished"
 	tplNameWakatimeFailureNotification = "wakatime_connection_failure"
 	tplNameReport                      = "report"
+	tplNameSubscriptionNotification    = "subscription_expiring"
 	subjectPasswordReset               = "Wakapi - Password Reset"
 	subjectImportNotification          = "Wakapi - Data Import Finished"
 	subjectWakatimeFailureNotification = "Wakapi - WakaTime Connection Failure"
 	subjectReport                      = "Wakapi - Report from %s"
+	subjectSubscriptionNotification    = "Wakapi - Subscription expiring / expired"
 )
 
 type SendingService interface {
@@ -122,6 +124,24 @@ func (m *MailService) SendReport(recipient *models.User, report *models.Report)
 	return m.sendingService.Send(mail)
 }
 
+func (m *MailService) SendSubscriptionNotification(recipient *models.User, hasExpired bool) error {
+	tpl, err := m.getSubscriptionNotificationTemplate(SubscriptionNotificationTplData{
+		PublicUrl:           m.config.Server.PublicUrl,
+		DataRetentionMonths: m.config.App.DataRetentionMonths,
+		HasExpired:          hasExpired,
+	})
+	if err != nil {
+		return err
+	}
+	mail := &models.Mail{
+		From:    models.MailAddress(m.config.Mail.Sender),
+		To:      models.MailAddresses([]models.MailAddress{models.MailAddress(recipient.Email)}),
+		Subject: subjectSubscriptionNotification,
+	}
+	mail.WithHTML(tpl.String())
+	return m.sendingService.Send(mail)
+}
+
 func (m *MailService) getPasswordResetTemplate(data PasswordResetTplData) (*bytes.Buffer, error) {
 	var rendered bytes.Buffer
 	if err := m.templates[m.fmtName(tplNamePasswordReset)].Execute(&rendered, data); err != nil {
@@ -154,6 +174,14 @@ func (m *MailService) getReportTemplate(data ReportTplData) (*bytes.Buffer, erro
 	return &rendered, nil
 }
 
+func (m *MailService) getSubscriptionNotificationTemplate(data SubscriptionNotificationTplData) (*bytes.Buffer, error) {
+	var rendered bytes.Buffer
+	if err := m.templates[m.fmtName(tplNameSubscriptionNotification)].Execute(&rendered, data); err != nil {
+		return nil, err
+	}
+	return &rendered, nil
+}
+
 func (m *MailService) fmtName(name string) string {
 	return fmt.Sprintf("%s.tpl.html", name)
 }

services/mail/types.go

@@ -20,3 +20,9 @@ type WakatimeFailureNotificationNotificationTplData struct {
 type ReportTplData struct {
 	Report *models.Report
 }
+
+type SubscriptionNotificationTplData struct {
+	PublicUrl           string
+	HasExpired          bool
+	DataRetentionMonths int
+}

services/misc.go

@@ -2,12 +2,14 @@ package services
 
 import (
 	"fmt"
+	"github.com/duke-git/lancet/v2/slice"
 	"github.com/emvi/logbuch"
 	"github.com/muety/artifex/v2"
 	"github.com/muety/wakapi/config"
 	"github.com/muety/wakapi/utils"
 	"go.uber.org/atomic"
 	"strconv"
+	"strings"
 	"sync"
 	"time"
 
@@ -15,8 +17,13 @@ import (
 )
 
 const (
-	countUsersEvery        = 1 * time.Hour
+	countUsersEvery                  = 1 * time.Hour
-	computeOldestDataEvery = 6 * time.Hour
+	computeOldestDataEvery           = 6 * time.Hour
+	notifyExpiringSubscriptionsEvery = 12 * time.Hour
+)
+
+const (
+	notifyBeforeSubscriptionExpiry = 7 * 24 * time.Hour
 )
 
 var countLock = sync.Mutex{}
@@ -28,19 +35,23 @@ type MiscService struct {
 	heartbeatService IHeartbeatService
 	summaryService   ISummaryService
 	keyValueService  IKeyValueService
+	mailService      IMailService
 	queueDefault     *artifex.Dispatcher
 	queueWorkers     *artifex.Dispatcher
+	queueMails       *artifex.Dispatcher
 }
 
-func NewMiscService(userService IUserService, heartbeatService IHeartbeatService, summaryService ISummaryService, keyValueService IKeyValueService) *MiscService {
+func NewMiscService(userService IUserService, heartbeatService IHeartbeatService, summaryService ISummaryService, keyValueService IKeyValueService, mailService IMailService) *MiscService {
 	return &MiscService{
 		config:           config.Get(),
 		userService:      userService,
 		heartbeatService: heartbeatService,
 		summaryService:   summaryService,
 		keyValueService:  keyValueService,
+		mailService:      mailService,
 		queueDefault:     config.GetDefaultQueue(),
 		queueWorkers:     config.GetQueue(config.QueueProcessing),
+		queueMails:       config.GetQueue(config.QueueMails),
 	}
 }
 
@@ -55,6 +66,13 @@ func (srv *MiscService) Schedule() {
 		config.Log().Error("failed to schedule first data computing jobs, %v", err)
 	}
 
+	if srv.config.Subscriptions.Enabled && srv.config.Subscriptions.ExpiryNotifications && srv.config.App.DataRetentionMonths > 0 {
+		logbuch.Info("scheduling subscription notifications")
+		if _, err := srv.queueDefault.DispatchEvery(srv.ComputeOldestHeartbeats, notifyExpiringSubscriptionsEvery); err != nil {
+			config.Log().Error("failed to schedule subscription notification jobs, %v", err)
+		}
+	}
+
 	// run once initially for a fresh instance
 	if !srv.existsUsersTotalTime() {
 		if err := srv.queueDefault.Dispatch(srv.CountTotalTime); err != nil {
@@ -66,6 +84,11 @@ func (srv *MiscService) Schedule() {
 			config.Log().Error("failed to dispatch first data computing jobs, %v", err)
 		}
 	}
+	if !srv.existsSubscriptionNotifications() && srv.config.Subscriptions.Enabled && srv.config.Subscriptions.ExpiryNotifications && srv.config.App.DataRetentionMonths > 0 {
+		if err := srv.queueDefault.Dispatch(srv.NotifyExpiringSubscription); err != nil {
+			config.Log().Error("failed to schedule subscription notification jobs, %v", err)
+		}
+	}
 }
 
 func (srv *MiscService) CountTotalTime() {
@@ -78,6 +101,7 @@ func (srv *MiscService) CountTotalTime() {
 	users, err := srv.userService.GetAll()
 	if err != nil {
 		config.Log().Error("failed to fetch users for time counting, %v", err)
+		return
 	}
 
 	var totalTime = atomic.NewDuration(0)
@@ -130,6 +154,7 @@ func (srv *MiscService) ComputeOldestHeartbeats() {
 		results, err := srv.heartbeatService.GetFirstByUsers()
 		if err != nil {
 			config.Log().Error("failed to compute users' first data, %v", err)
+			return
 		}
 
 		for _, entry := range results {
@@ -150,6 +175,55 @@ func (srv *MiscService) ComputeOldestHeartbeats() {
 	}
 }
 
+// NotifyExpiringSubscription sends a reminder e-mail to all users, notifying them if their subscription has expired or is about to, given these conditions:
+// - Data cleanup is enabled on the server (non-zero retention time)
+// - Subscriptions are enabled on the server (aka. users can do something about their old data getting cleaned up)
+// - User has an e-mail address configured
+// - User's subscription has expired or is about to expire soon
+// - The user has gotten no such e-mail before recently
+// Note: only one mail will be sent for either "expired" or "about to expire" state.
+func (srv *MiscService) NotifyExpiringSubscription() {
+	if srv.config.App.DataRetentionMonths <= 0 || !srv.config.Subscriptions.Enabled {
+		return
+	}
+
+	logbuch.Info("notifying users about soon to expire subscriptions")
+
+	users, err := srv.userService.GetAll()
+	if err != nil {
+		config.Log().Error("failed to fetch users for subscription notifications, %v", err)
+		return
+	}
+
+	var subscriptionReminders map[string][]*models.KeyStringValue
+	if result, err := srv.keyValueService.GetByPrefix(config.KeySubscriptionNotificationSent); err == nil {
+		subscriptionReminders = slice.GroupWith[*models.KeyStringValue, string](result, func(kv *models.KeyStringValue) string {
+			return strings.TrimPrefix(kv.Key, config.KeySubscriptionNotificationSent+"_")
+		})
+	} else {
+		config.Log().Error("failed to fetch key-values for subscription notifications, %v", err)
+		return
+	}
+
+	for _, u := range users {
+		if u.HasActiveSubscription() && u.Email == "" {
+			config.Log().Warn("invalid state: user '%s' has active subscription but no e-mail address set")
+		}
+
+		// skip users without e-mail address
+		// skip users who already received a notification before
+		// skip users who either never had a subscription before or intentionally deleted it
+		if _, ok := subscriptionReminders[u.ID]; ok || u.Email == "" || u.SubscribedUntil == nil {
+			continue
+		}
+
+		expired, expiredSince := u.SubscriptionExpiredSince()
+		if expired || (expiredSince < 0 && expiredSince*-1 <= notifyBeforeSubscriptionExpiry) {
+			srv.sendSubscriptionNotificationScheduled(u, expired)
+		}
+	}
+}
+
 func (srv *MiscService) countUserTotalTime(userId string) time.Duration {
 	result, err := srv.summaryService.Aliased(time.Time{}, time.Now(), &models.User{ID: userId}, srv.summaryService.Retrieve, nil, false)
 	if err != nil {
@@ -159,6 +233,26 @@ func (srv *MiscService) countUserTotalTime(userId string) time.Duration {
 	return result.TotalTime()
 }
 
+func (srv *MiscService) sendSubscriptionNotificationScheduled(user *models.User, hasExpired bool) {
+	u := *user
+	srv.queueMails.Dispatch(func() {
+		logbuch.Info("sending subscription expiry notification mail to %s (expired: %v)", u.ID, hasExpired)
+		defer time.Sleep(10 * time.Second)
+
+		if err := srv.mailService.SendSubscriptionNotification(&u, hasExpired); err != nil {
+			config.Log().Error("failed to send subscription notification mail to user '%s', %v", u.ID, err)
+			return
+		}
+
+		if err := srv.keyValueService.PutString(&models.KeyStringValue{
+			Key:   fmt.Sprintf("%s_%s", config.KeySubscriptionNotificationSent, u.ID),
+			Value: time.Now().Format(time.RFC822Z),
+		}); err != nil {
+			config.Log().Error("failed to update subscription notification status key-value for user %s, %v", u.ID, err)
+		}
+	})
+}
+
 func (srv *MiscService) existsUsersTotalTime() bool {
 	results, _ := srv.keyValueService.GetByPrefix(config.KeyLatestTotalTime)
 	return len(results) > 0
@@ -168,3 +262,8 @@ func (srv *MiscService) existsUsersFirstData() bool {
 	results, _ := srv.keyValueService.GetByPrefix(config.KeyFirstHeartbeat)
 	return len(results) > 0
 }
+
+func (srv *MiscService) existsSubscriptionNotifications() bool {
+	results, _ := srv.keyValueService.GetByPrefix(config.KeySubscriptionNotificationSent)
+	return len(results) > 0
+}

services/services.go

@@ -80,6 +80,7 @@ type IMailService interface {
 	SendWakatimeFailureNotification(*models.User, int) error
 	SendImportNotification(*models.User, time.Duration, int) error
 	SendReport(*models.User, *models.Report) error
+	SendSubscriptionNotification(*models.User, bool) error
 }
 
 type IDurationService interface {

views/mail/subscription_expiring.tpl.html

@@ -0,0 +1,62 @@
+<!doctype html>
+<html lang="en">
+
+{{ template "head.tpl.html" . }}
+
+<body class="" style="background-color: #f6f6f6; font-family: sans-serif; -webkit-font-smoothing: antialiased; font-size: 14px; line-height: 1.4; margin: 0; padding: 0; -ms-text-size-adjust: 100%; -webkit-text-size-adjust: 100%;">
+<table border="0" cellpadding="0" cellspacing="0" class="body" style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; background-color: #f6f6f6;">
+    <tr>
+        <td style="font-family: sans-serif; font-size: 14px; vertical-align: top;">&nbsp;</td>
+        <td class="container" style="font-family: sans-serif; font-size: 14px; vertical-align: top; display: block; Margin: 0 auto; max-width: 580px; padding: 10px; width: 580px;">
+            {{ template "theader.tpl.html" . }}
+
+            <div class="content" style="box-sizing: border-box; display: block; Margin: 0 auto; max-width: 580px; padding: 10px;">
+                <table class="main" style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; background: #ffffff; border-radius: 3px;">
+                    <tr>
+                        <td class="wrapper" style="font-family: sans-serif; font-size: 14px; vertical-align: top; box-sizing: border-box; padding: 20px;">
+                            <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%;">
+                                <tr>
+                                    <td style="font-family: sans-serif; font-size: 14px; vertical-align: top;">
+                                        {{ if .HasExpired }}
+                                        <p style="font-family: sans-serif; font-size: 18px; font-weight: 500; margin: 0; Margin-bottom: 15px;">Subscription expired</p>
+                                        {{ else }}
+                                        <p style="font-family: sans-serif; font-size: 18px; font-weight: 500; margin: 0; Margin-bottom: 15px;">Subscription about to expire</p>
+                                        {{ end }}
+                                        <p style="font-family: sans-serif; font-size: 14px; font-weight: normal; margin: 0; Margin-bottom: 15px;">
+                                            {{ if .HasExpired }}
+                                            Your Wakapi subscription has expired.
+                                            {{ else }}
+                                            Your Wakapi subscription will expire soon.
+                                            {{ end }}
+                                            All coding activity older than {{ .DataRetentionMonths }} months will be deleted soon. Please refer to <a href="https://github.com/muety/wakapi/discussions/447" target="_blank">this article</a> for further details on subscriptions.
+                                        </p>
+                                        <table border="0" cellpadding="0" cellspacing="0" class="btn btn-primary" style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: 100%; box-sizing: border-box;">
+                                            <tbody>
+                                            <tr>
+                                                <td align="left" style="font-family: sans-serif; font-size: 14px; vertical-align: top; padding-bottom: 15px;">
+                                                    <table border="0" cellpadding="0" cellspacing="0" style="border-collapse: separate; mso-table-lspace: 0pt; mso-table-rspace: 0pt; width: auto;">
+                                                        <tbody>
+                                                        <tr>
+                                                            <td style="font-family: sans-serif; font-size: 14px; vertical-align: top; background-color: #2F855A; border-radius: 5px; text-align: center;"> <a href="{{ .PublicUrl }}/settings#subscription" target="_blank" style="display: inline-block; color: #ffffff; background-color: #2F855A; border: solid 1px #2F855A; border-radius: 5px; box-sizing: border-box; cursor: pointer; text-decoration: none; font-size: 14px; font-weight: bold; margin: 0; padding: 12px 25px; text-transform: capitalize; border-color: #2F855A;">Go to settings</a> </td>
+                                                        </tr>
+                                                        </tbody>
+                                                    </table>
+                                                </td>
+                                            </tr>
+                                            </tbody>
+                                        </table>
+                                    </td>
+                                </tr>
+                            </table>
+                        </td>
+                    </tr>
+                </table>
+
+                {{ template "tfooter.tpl.html" . }}
+            </div>
+        </td>
+        <td style="font-family: sans-serif; font-size: 14px; vertical-align: top;">&nbsp;</td>
+    </tr>
+</table>
+</body>
+</html>