Send registration email on user autoregistration (#16523)

When users login and are autoregistered send email notification.

Fix #16178

* Protect public functions within the mailer by testing if the mailer is configured

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: 6543 <6543@obermui.de>

3 files changed, 25 insertions, 3 deletions

diff --git a/services/auth/source/ldap/source_authenticate.go b/services/auth/source/ldap/source_authenticate.go
index 1d5e69539b..ecc95fbd56 100644
--- a/services/auth/source/ldap/source_authenticate.go
+++ b/services/auth/source/ldap/source_authenticate.go
@@ -9,6 +9,7 @@ import (
 	"strings"
 
 	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/services/mailer"
 )
 
 // Authenticate queries if login/password is valid against the LDAP directory pool,
@@ -84,8 +85,13 @@ func (source *Source) Authenticate(user *models.User, login, password string) (*
 	}
 
 	err := models.CreateUser(user)
+	if err != nil {
+		return user, err
+	}
+
+	mailer.SendRegisterNotifyMail(user)
 
-	if err == nil && isAttributeSSHPublicKeySet && models.AddPublicKeysBySource(user, source.loginSource, sr.SSHPublicKey) {
+	if isAttributeSSHPublicKeySet && models.AddPublicKeysBySource(user, source.loginSource, sr.SSHPublicKey) {
 		err = models.RewriteAllPublicKeys()
 	}
 
diff --git a/services/auth/source/pam/source_authenticate.go b/services/auth/source/pam/source_authenticate.go
index 6ca0642904..8241aed725 100644
--- a/services/auth/source/pam/source_authenticate.go
+++ b/services/auth/source/pam/source_authenticate.go
@@ -11,6 +11,7 @@ import (
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/auth/pam"
 	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/services/mailer"
 
 	"github.com/google/uuid"
 )
@@ -58,5 +59,12 @@ func (source *Source) Authenticate(user *models.User, login, password string) (*
 		LoginName:   login, // This is what the user typed in
 		IsActive:    true,
 	}
-	return user, models.CreateUser(user)
+
+	if err := models.CreateUser(user); err != nil {
+		return user, err
+	}
+
+	mailer.SendRegisterNotifyMail(user)
+
+	return user, nil
 }
diff --git a/services/auth/source/smtp/source_authenticate.go b/services/auth/source/smtp/source_authenticate.go
index e3dcd83222..cff64c69d2 100644
--- a/services/auth/source/smtp/source_authenticate.go
+++ b/services/auth/source/smtp/source_authenticate.go
@@ -12,6 +12,7 @@ import (
 
 	"code.gitea.io/gitea/models"
 	"code.gitea.io/gitea/modules/util"
+	"code.gitea.io/gitea/services/mailer"
 )
 
 // Authenticate queries if the provided login/password is authenticates against the SMTP server
@@ -74,5 +75,12 @@ func (source *Source) Authenticate(user *models.User, login, password string) (*
 		LoginName:   login,
 		IsActive:    true,
 	}
-	return user, models.CreateUser(user)
+
+	if err := models.CreateUser(user); err != nil {
+		return user, err
+	}
+
+	mailer.SendRegisterNotifyMail(user)
+
+	return user, nil
 }