add session token and region; fix mx record parsing issue

client.go

@@ -50,6 +50,7 @@ func (p *Provider) listRecords(ctx context.Context, zone string) ([]libdns.Recor
 			Name:  txRecord.Name,
 			Value: txRecord.Value,
 			TTL:   time.Duration(txRecord.TTL) * time.Second,
+			MX:    txRecord.MX,
 		}
 		libdnsRecord, err := rr.libdnsRecord()
 		if err != nil {
@@ -177,15 +178,20 @@ func (p *Provider) findRecord(ctx context.Context, zone string, record libdns.Re
 }
 
 func (p *Provider) sendRequest(ctx context.Context, action string, data string) ([]byte, error) {
-	req, err := http.NewRequestWithContext(ctx, "POST", endpoint, strings.NewReader(data))
+	endpointUrl := endpoint
+	if p.Region != "" {
+		endpointUrl = "https://dnspod." + p.Region + ".tencentcloudapi.com"
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", endpointUrl, strings.NewReader(data))
 	if err != nil {
 		return nil, err
 	}
 
 	req.Header.Set("Content-Type", "application/json")
 	req.Header.Set("X-TC-Version", "2021-03-23")
 
-	SignRequest(p.SecretId, p.SecretKey, req, action, data)
+	SignRequest(p.SecretId, p.SecretKey, p.SessionToken, req, action, data)
 	resp, err := http.DefaultClient.Do(req)
 	if err != nil {
 		return nil, err

signer.go

@@ -11,7 +11,7 @@ import (
 )
 
 // SignRequest https://github.com/jeessy2/ddns-go/blob/master/util/tencent_cloud_signer.go
-func SignRequest(secretId string, secretKey string, r *http.Request, action string, payload string) {
+func SignRequest(secretId string, secretKey string, sessionToken string, r *http.Request, action string, payload string) {
 	algorithm := "TC3-HMAC-SHA256"
 	service := "dnspod"
 	host := writeString(service, ".tencentcloudapi.com")
@@ -43,6 +43,11 @@ func SignRequest(secretId string, secretKey string, r *http.Request, action stri
 	r.Header.Set("Host", host)
 	r.Header.Set("X-TC-Action", action)
 	r.Header.Set("X-TC-Timestamp", timestampStr)
+
+	// Add session token if provided
+	if sessionToken != "" {
+		r.Header.Set("X-TC-Token", sessionToken)
+	}
 }
 
 func sha256hex(s string) string {

types.go

@@ -2,6 +2,7 @@ package tencentcloud
 
 import (
 	"errors"
+	"strconv"
 	"time"
 
 	"github.com/libdns/libdns"
@@ -11,8 +12,10 @@ var ErrRecordNotFound = errors.New("record not found")
 var ErrNotValid = errors.New("returned value is not valid")
 
 type Provider struct {
-	SecretId  string
-	SecretKey string
+	SecretId     string
+	SecretKey    string
+	SessionToken string
+	Region       string
 }
 
 type CreateModifyRecordRequest struct {
@@ -54,6 +57,7 @@ type RecordInfo struct {
 	Name     string `json:"Name"`
 	Value    string `json:"Value"`
 	TTL      int64  `json:"TTL"`
+	MX       int    `json:"MX,omitempty"`
 }
 
 type ErrorInfo struct {
@@ -66,9 +70,13 @@ type record struct {
 	Name  string
 	Value string
 	TTL   time.Duration
+	MX    int
 }
 
 func (r record) libdnsRecord() (libdns.Record, error) {
+	if r.Type == "MX" {
+		r.Value = strconv.Itoa(r.MX) + " " + r.Value
+	}
 	return libdns.RR{
 		Type: r.Type,
 		Name: r.Name,