[GITEA] notifies admins on new user registration

Sends email with information on the new user (time of creation and time of last sign-in) and a link to manage the new user from the admin panel

closes: https://codeberg.org/forgejo/forgejo/issues/480

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/1371
Co-authored-by: Aravinth Manivannan <realaravinth@batsense.net>
Co-committed-by: Aravinth Manivannan <realaravinth@batsense.net>
(cherry picked from commit c721aa828b)
(cherry picked from commit 6487efcb9d)

Conflicts:
	modules/notification/base/notifier.go
	modules/notification/base/null.go
	modules/notification/notification.go
	https://codeberg.org/forgejo/forgejo/pulls/1422
(cherry picked from commit 7ea66ee1c5)

Conflicts:
	services/notify/notifier.go
	services/notify/notify.go
	services/notify/null.go
	https://codeberg.org/forgejo/forgejo/pulls/1469
(cherry picked from commit 7d2d997011)
(cherry picked from commit 435a54f140)
(cherry picked from commit 8ec7b3e448)

[GITEA] notifies admins on new user registration (squash) performance bottleneck

Refs: https://codeberg.org/forgejo/forgejo/issues/1479
(cherry picked from commit 97ac9147ff)
(cherry picked from commit 19f295c16b)
(cherry picked from commit 3367dcb2cf)

[GITEA] notifies admins on new user registration (squash) cosmetic changes

Co-authored-by: delvh <dev.lh@web.de>
(cherry picked from commit 9f1670e040)
(cherry picked from commit de5bb2a224)
(cherry picked from commit 8f8e52f31a)
(cherry picked from commit e0d5130312)
(cherry picked from commit f1288d6d9b)
(cherry picked from commit f664f41658)

custom/conf/app.example.ini

@@ -1455,6 +1455,8 @@ LEVEL = Info
 ;;
 ;; Default configuration for email notifications for users (user configurable). Options: enabled, onmention, disabled
 ;DEFAULT_EMAIL_NOTIFICATIONS = enabled
+;; Send an email to all admins when a new user signs up to inform the admins about this act. Options: true, false
+;SEND_NOTIFICATION_EMAIL_ON_NEW_USER = false
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

docs/content/administration/config-cheat-sheet.en-us.md

@@ -510,6 +510,7 @@ And the following unique queues:
 
 - `DEFAULT_EMAIL_NOTIFICATIONS`: **enabled**: Default configuration for email notifications for users (user configurable). Options: enabled, onmention, disabled
 - `DISABLE_REGULAR_ORG_CREATION`: **false**: Disallow regular (non-admin) users from creating organizations.
+- `SEND_NOTIFICATION_EMAIL_ON_NEW_USER`: **false**: Send an email to all admins when a new user signs up to inform the admins about this act.
 
 ## Security (`security`)
 

models/user/user.go

@@ -223,6 +223,12 @@ func GetAllUsers(ctx context.Context) ([]*User, error) {
 	return users, db.GetEngine(ctx).OrderBy("id").Where("type = ?", UserTypeIndividual).Find(&users)
 }
 
+// GetAllAdmins returns a slice of all adminusers found in DB.
+func GetAllAdmins(ctx context.Context) ([]*User, error) {
+	users := make([]*User, 0)
+	return users, db.GetEngine(ctx).OrderBy("id").Where("type = ?", UserTypeIndividual).And("is_admin = ?", true).Find(&users)
+}
+
 // IsLocal returns true if user login type is LoginPlain.
 func (u *User) IsLocal() bool {
 	return u.LoginType <= auth.Plain

models/user/user_test.go

@@ -544,3 +544,13 @@ func Test_ValidateUser(t *testing.T) {
 		assert.EqualValues(t, expected, err == nil, fmt.Sprintf("case: %+v", kase))
 	}
 }
+
+func TestGetAllAdmins(t *testing.T) {
+	assert.NoError(t, unittest.PrepareTestDatabase())
+
+	admins, err := user_model.GetAllAdmins(db.DefaultContext)
+	assert.NoError(t, err)
+
+	assert.Len(t, admins, 1)
+	assert.Equal(t, int64(1), admins[0].ID)
+}

modules/setting/admin.go

@@ -5,8 +5,9 @@ package setting
 
 // Admin settings
 var Admin struct {
-	DisableRegularOrgCreation bool
-	DefaultEmailNotification  string
+	DisableRegularOrgCreation      bool
+	DefaultEmailNotification       string
+	SendNotificationEmailOnNewUser bool
 }
 
 func loadAdminFrom(rootCfg ConfigProvider) {

options/locale/locale_en-US.ini

@@ -440,6 +440,10 @@ activate_email = Verify your email address
 activate_email.title = %s, please verify your email address
 activate_email.text = Please click the following link to verify your email address within <b>%s</b>:
 
+admin.new_user.subject = New user %s just signed up
+admin.new_user.user_info = User Information
+admin.new_user.text = Please <a href="%s">click here</a> to manage the user from the admin panel.
+
 register_notify = Welcome to Gitea
 register_notify.title = %[1]s, welcome to %[2]s
 register_notify.text_1 = this is your registration confirmation email for %s!

routers/web/auth/auth.go

@@ -30,6 +30,7 @@ import (
 	"code.gitea.io/gitea/services/externalaccount"
 	"code.gitea.io/gitea/services/forms"
 	"code.gitea.io/gitea/services/mailer"
+	notify_service "code.gitea.io/gitea/services/notify"
 
 	"github.com/markbates/goth"
 )
@@ -586,6 +587,7 @@ func handleUserCreated(ctx *context.Context, u *user_model.User, gothUser *goth.
 		}
 	}
 
+	notify_service.NewUserSignUp(ctx, u)
 	// update external user information
 	if gothUser != nil {
 		if err := externalaccount.UpdateExternalUser(u, *gothUser); err != nil {
@@ -609,7 +611,6 @@ func handleUserCreated(ctx *context.Context, u *user_model.User, gothUser *goth.
 		ctx.Data["Email"] = u.Email
 		ctx.Data["ActiveCodeLives"] = timeutil.MinutesToFriendly(setting.Service.ActiveCodeLives, ctx.Locale)
 		ctx.HTML(http.StatusOK, TplActivate)
-
 		if setting.CacheService.Enabled {
 			if err := ctx.Cache.Put("MailResendLimit_"+u.LowerName, u.LowerName, 180); err != nil {
 				log.Error("Set cache(MailResendLimit) fail: %v", err)

services/mailer/mail_admin_new_user.go

@@ -0,0 +1,80 @@
+// Copyright 2023 The Forgejo Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+package mailer
+
+import (
+	"bytes"
+	"context"
+	"strconv"
+
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/base"
+	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/modules/templates"
+	"code.gitea.io/gitea/modules/translation"
+)
+
+const (
+	tplNewUserMail base.TplName = "notify/admin_new_user"
+)
+
+var sa = SendAsyncs
+
+// MailNewUser sends notification emails on new user registrations to all admins
+func MailNewUser(ctx context.Context, u *user_model.User) {
+	if !setting.Admin.SendNotificationEmailOnNewUser {
+		return
+	}
+
+	if setting.MailService == nil {
+		// No mail service configured
+		return
+	}
+
+	recipients, err := user_model.GetAllAdmins(ctx)
+	if err != nil {
+		log.Error("user_model.GetAllAdmins: %v", err)
+		return
+	}
+
+	langMap := make(map[string][]string)
+	for _, r := range recipients {
+		langMap[r.Language] = append(langMap[r.Language], r.Email)
+	}
+
+	for lang, tos := range langMap {
+		mailNewUser(ctx, u, lang, tos)
+	}
+}
+
+func mailNewUser(ctx context.Context, u *user_model.User, lang string, tos []string) {
+	locale := translation.NewLocale(lang)
+
+	subject := locale.Tr("mail.admin.new_user.subject", u.Name)
+	manageUserURL := setting.AppSubURL + "/admin/users/" + strconv.FormatInt(u.ID, 10)
+	body := locale.Tr("mail.admin.new_user.text", manageUserURL)
+	mailMeta := map[string]any{
+		"NewUser":  u,
+		"Subject":  subject,
+		"Body":     body,
+		"Language": locale.Language(),
+		"locale":   locale,
+		"Str2html": templates.Str2html,
+	}
+
+	var mailBody bytes.Buffer
+
+	if err := bodyTemplates.ExecuteTemplate(&mailBody, string(tplNewUserMail), mailMeta); err != nil {
+		log.Error("ExecuteTemplate [%s]: %v", string(tplNewUserMail)+"/body", err)
+		return
+	}
+
+	msgs := make([]*Message, 0, len(tos))
+	for _, to := range tos {
+		msg := NewMessage(to, subject, mailBody.String())
+		msg.Info = subject
+		msgs = append(msgs, msg)
+	}
+	sa(msgs)
+}

services/mailer/mail_admin_new_user_test.go

@@ -0,0 +1,88 @@
+// Copyright 2023 The Gitea Authors. All rights reserved.
+// SPDX-License-Identifier: MIT
+
+package mailer
+
+import (
+	"context"
+	"strconv"
+	"strings"
+	"testing"
+
+	"code.gitea.io/gitea/models/db"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/modules/setting"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func getTestUsers() []*user_model.User {
+	admin := new(user_model.User)
+	admin.Name = "admin"
+	admin.IsAdmin = true
+	admin.Language = "en_US"
+	admin.Email = "admin@example.com"
+
+	newUser := new(user_model.User)
+	newUser.Name = "new_user"
+	newUser.Language = "en_US"
+	newUser.IsAdmin = false
+	newUser.Email = "new_user@example.com"
+	newUser.LastLoginUnix = 1693648327
+	newUser.CreatedUnix = 1693648027
+
+	user_model.CreateUser(db.DefaultContext, admin)
+	user_model.CreateUser(db.DefaultContext, newUser)
+
+	users := make([]*user_model.User, 0)
+	users = append(users, admin)
+	users = append(users, newUser)
+
+	return users
+}
+
+func cleanUpUsers(ctx context.Context, users []*user_model.User) {
+	for _, u := range users {
+		db.DeleteByID(ctx, u.ID, new(user_model.User))
+	}
+}
+
+func TestAdminNotificationMail_test(t *testing.T) {
+	mailService := setting.Mailer{
+		From:     "test@example.com",
+		Protocol: "dummy",
+	}
+
+	setting.MailService = &mailService
+	setting.Domain = "localhost"
+	setting.AppSubURL = "http://localhost"
+
+	// test with SEND_NOTIFICATION_EMAIL_ON_NEW_USER enabled
+	setting.Admin.SendNotificationEmailOnNewUser = true
+
+	ctx := context.Background()
+	NewContext(ctx)
+
+	users := getTestUsers()
+	oldSendAsyncs := sa
+	defer func() {
+		sa = oldSendAsyncs
+		cleanUpUsers(ctx, users)
+	}()
+
+	sa = func(msgs []*Message) {
+		assert.Equal(t, len(msgs), 1, "Test provides only one admin user, so only one email must be sent")
+		assert.Equal(t, msgs[0].To, users[0].Email, "checks if the recipient is the admin of the instance")
+		manageUserURL := "/admin/users/" + strconv.FormatInt(users[1].ID, 10)
+		assert.True(t, strings.ContainsAny(msgs[0].Body, manageUserURL), "checks if the message contains the link to manage the newly created user from the admin panel")
+	}
+	MailNewUser(ctx, users[1])
+
+	// test with SEND_NOTIFICATION_EMAIL_ON_NEW_USER disabled; emails shouldn't be sent
+	setting.Admin.SendNotificationEmailOnNewUser = false
+	sa = func(msgs []*Message) {
+		assert.Equal(t, 1, 0, "this shouldn't execute. MailNewUser must exit early since SEND_NOTIFICATION_EMAIL_ON_NEW_USER is disabled")
+	}
+
+	MailNewUser(ctx, users[1])
+}

services/mailer/notify.go

@@ -202,3 +202,7 @@ func (m *mailNotifier) RepoPendingTransfer(ctx context.Context, doer, newOwner *
 		log.Error("SendRepoTransferNotifyMail: %v", err)
 	}
 }
+
+func (m *mailNotifier) NewUserSignUp(ctx context.Context, newUser *user_model.User) {
+	MailNewUser(ctx, newUser)
+}

services/notify/notifier.go

@@ -59,6 +59,8 @@ type Notifier interface {
 	EditWikiPage(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, page, comment string)
 	DeleteWikiPage(ctx context.Context, doer *user_model.User, repo *repo_model.Repository, page string)
 
+	NewUserSignUp(ctx context.Context, newUser *user_model.User)
+
 	NewRelease(ctx context.Context, rel *repo_model.Release)
 	UpdateRelease(ctx context.Context, doer *user_model.User, rel *repo_model.Release)
 	DeleteRelease(ctx context.Context, doer *user_model.User, rel *repo_model.Release)

services/notify/notify.go

@@ -347,6 +347,13 @@ func RepoPendingTransfer(ctx context.Context, doer, newOwner *user_model.User, r
 	}
 }
 
+// NewUserSignUp notifies about a newly signed up user to notifiers
+func NewUserSignUp(ctx context.Context, newUser *user_model.User) {
+	for _, notifier := range notifiers {
+		notifier.NewUserSignUp(ctx, newUser)
+	}
+}
+
 // PackageCreate notifies creation of a package to notifiers
 func PackageCreate(ctx context.Context, doer *user_model.User, pd *packages_model.PackageDescriptor) {
 	for _, notifier := range notifiers {

services/notify/null.go

@@ -197,6 +197,9 @@ func (*NullNotifier) SyncDeleteRef(ctx context.Context, doer *user_model.User, r
 func (*NullNotifier) RepoPendingTransfer(ctx context.Context, doer, newOwner *user_model.User, repo *repo_model.Repository) {
 }
 
+func (*NullNotifier) NewUserSignUp(ctx context.Context, newUser *user_model.User) {
+}
+
 // PackageCreate places a place holder function
 func (*NullNotifier) PackageCreate(ctx context.Context, doer *user_model.User, pd *packages_model.PackageDescriptor) {
 }

templates/mail/notify/admin_new_user.tmpl

@@ -0,0 +1,22 @@
+<!DOCTYPE html>
+<html>
+<head>
+	<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
+	<title>{{.Subject}}</title>
+
+	<style>
+		blockquote { padding-left: 1em; margin: 1em 0; border-left: 1px solid grey; color: #777}
+		.footer { font-size:small; color:#666;}
+	</style>
+
+</head>
+
+<body>
+	<ul>
+		<h3>{{.locale.Tr "mail.admin.new_user.user_info"}}</h3>
+		<li>{{.locale.Tr "admin.users.created"}}: {{DateTime "full" .NewUser.LastLoginUnix}}</li>
+		<li>{{.locale.Tr "admin.users.last_login"}}: {{DateTime "full" .NewUser.CreatedUnix}}</li>
+	</ul>
+	<p> {{.Body | Str2html}} </p>
+</body>
+</html>