tsk-11: Obtain refresh token (#18)

Closes #11

Reviewed-on: #18
Co-authored-by: phoenix <kundeng00@pm.me>
Co-committed-by: phoenix <kundeng00@pm.me>

internal/service/auth.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
+	"time"
 
 	"git.kundeng.us/phoenix/textsender-models/tx0/token"
 
@@ -53,3 +54,45 @@ func (a *Auth) GetToken() (*token.Login, error) {
 
 	return r.Data[0], nil
 }
+
+type refreshTokenRequest struct {
+	AccessToken string `json:"access_token"`
+}
+
+func (a *Auth) GetRefreshToken(tok *token.Login) (*token.Login, error) {
+	req := refreshTokenRequest{AccessToken: tok.AccessToken}
+
+	jsonData, err := json.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+
+	resp, err := http.Post(fmt.Sprintf("%s/api/v1/token/refresh", a.Application.AuthUrl), "application/json", bytes.NewBuffer(jsonData))
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	var r tokenResponse
+	err = json.NewDecoder(resp.Body).Decode(&r)
+	if err != nil {
+		return nil, err
+	} else {
+		if len(r.Data) == 0 {
+			return nil, nil
+		} else {
+			return r.Data[0], nil
+		}
+	}
+}
+
+func (s *Auth) TokenExpired(tok *token.Login) bool {
+	now := time.Now()
+	expiredTime := time.Unix(tok.ExpiresIn, 0)
+
+	if now.After(expiredTime) {
+		return true
+	} else {
+		return false
+	}
+}