move invite by mail to services package (go-gitea#21513)

followup  go-gitea#20307
close go-gitea#21511

-> make it easy to also add API equivalent later ...

Author: 6543

routers/web/org/teams.go

@@ -27,7 +27,6 @@ import (
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/routers/utils"
 	"code.gitea.io/gitea/services/forms"
-	"code.gitea.io/gitea/services/mailer"
 	org_service "code.gitea.io/gitea/services/org"
 )
 
@@ -132,8 +131,7 @@ func TeamsAction(ctx *context.Context) {
 		if err != nil {
 			if user_model.IsErrUserNotExist(err) {
 				if setting.MailService != nil && user_model.ValidateEmail(uname) == nil {
-					invite, err := org_model.CreateTeamInvite(ctx, ctx.Doer, ctx.Org.Team, uname)
-					if err != nil {
+					if err := org_service.CreateTeamInvite(ctx, ctx.Doer, ctx.Org.Team, uname); err != nil {
 						if org_model.IsErrTeamInviteAlreadyExist(err) {
 							ctx.Flash.Error(ctx.Tr("form.duplicate_invite_to_team"))
 						} else if org_model.IsErrUserEmailAlreadyAdded(err) {
@@ -142,9 +140,6 @@ func TeamsAction(ctx *context.Context) {
 							ctx.ServerError("CreateTeamInvite", err)
 							return
 						}
-					} else if err := mailer.MailTeamInvite(ctx, ctx.Doer, ctx.Org.Team, invite); err != nil {
-						ctx.ServerError("MailTeamInvite", err)
-						return
 					}
 				} else {
 					ctx.Flash.Error(ctx.Tr("form.user_not_exist"))

services/org/team_invite.go

@@ -0,0 +1,23 @@
+// Copyright 2022 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package org
+
+import (
+	"context"
+
+	org_model "code.gitea.io/gitea/models/organization"
+	user_model "code.gitea.io/gitea/models/user"
+	"code.gitea.io/gitea/services/mailer"
+)
+
+// CreateTeamInvite make a persistent invite in db and mail it
+func CreateTeamInvite(ctx context.Context, inviter *user_model.User, team *org_model.Team, uname string) error {
+	invite, err := org_model.CreateTeamInvite(ctx, inviter, team, uname)
+	if err != nil {
+		return err
+	}
+
+	return mailer.MailTeamInvite(ctx, inviter, team, invite)
+}