feat: support acs email provider (#2323)

* feat: support acs email provider

* feat: support acs email provider

* hide Test SMTP Connection button

* fix name acs

email/smtp.go

@@ -0,0 +1,49 @@
+// Copyright 2023 The Casdoor Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package email
+
+import (
+	"crypto/tls"
+
+	"github.com/casdoor/gomail/v2"
+)
+
+type SmtpEmailProvider struct {
+	Dialer *gomail.Dialer
+}
+
+func NewSmtpEmailProvider(userName string, password string, host string, port int, typ string, disableSsl bool) *SmtpEmailProvider {
+	dialer := &gomail.Dialer{}
+	dialer = gomail.NewDialer(host, port, userName, password)
+	if typ == "SUBMAIL" {
+		dialer.TLSConfig = &tls.Config{InsecureSkipVerify: true}
+	}
+
+	dialer.SSL = !disableSsl
+
+	return &SmtpEmailProvider{Dialer: dialer}
+}
+
+func (s *SmtpEmailProvider) Send(fromAddress string, fromName string, toAddress string, subject string, content string) error {
+	message := gomail.NewMessage()
+
+	message.SetAddressHeader("From", fromAddress, fromName)
+	message.SetHeader("To", toAddress)
+	message.SetHeader("Subject", subject)
+	message.SetBody("text/html", content)
+
+	message.SkipUsernameCheck = true
+	return s.Dialer.DialAndSend(message)
+}