新增支持LoginAuth认证方式适用于IBM、微软等部分邮箱服务 (#2041)

server/plugin/email/utils/email.go

@@ -60,8 +60,14 @@ func send(to []string, subject string, body string) error {
 	host := global.GlobalConfig.Host
 	port := global.GlobalConfig.Port
 	isSSL := global.GlobalConfig.IsSSL
+	isLoginAuth := global.GlobalConfig.IsLoginAuth
 
-	auth := smtp.PlainAuth("", from, secret, host)
+	var auth smtp.Auth
+	if isLoginAuth {
+		auth = LoginAuth(from, secret)
+	} else {
+		auth = smtp.PlainAuth("", from, secret, host)
+	}
 	e := email.NewEmail()
 	if nickname != "" {
 		e.From = fmt.Sprintf("%s <%s>", nickname, from)
@@ -80,3 +86,37 @@ func send(to []string, subject string, body string) error {
 	}
 	return err
 }
+
+// LoginAuth 用于IBM、微软邮箱服务器的LOGIN认证方式
+type loginAuth struct {
+	username, password string
+}
+
+func LoginAuth(username, password string) smtp.Auth {
+	return &loginAuth{username, password}
+}
+
+func (a *loginAuth) Start(server *smtp.ServerInfo) (string, []byte, error) {
+	return "LOGIN", []byte{}, nil
+}
+
+func (a *loginAuth) Next(fromServer []byte, more bool) ([]byte, error) {
+	if more {
+		switch string(fromServer) {
+		case "Username:":
+			return []byte(a.username), nil
+		case "Password:":
+			return []byte(a.password), nil
+		default:
+			// 邮箱服务器可能发送的其他提示信息
+			prompt := strings.ToLower(string(fromServer))
+			if strings.Contains(prompt, "username") || strings.Contains(prompt, "user") {
+				return []byte(a.username), nil
+			}
+			if strings.Contains(prompt, "password") || strings.Contains(prompt, "pass") {
+				return []byte(a.password), nil
+			}
+		}
+	}
+	return nil, nil
+}