From 921138f45066ad6b85c430b4c3cb2011ea458c71 Mon Sep 17 00:00:00 2001
From: Tordarus <tordarus@protonmail.com>
Date: Sun, 2 Feb 2025 10:54:39 +0100
Subject: [PATCH] Refresh and AutoRefresh implemented

---
 ap_info.go |  3 +++
 api.go     | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 client.go  |  3 +++
 device.go  |  3 +++
 site.go    |  3 +++
 5 files changed, 77 insertions(+)

diff --git a/ap_info.go b/ap_info.go
index 082eb40..7a2597d 100644
--- a/ap_info.go
+++ b/ap_info.go
@@ -8,6 +8,9 @@ import (
 )
 
 func (api *Api) GetApInfo(siteID model.SiteID, macAddress string) (*model.ApInfo, error) {
+	api.refreshMutex.RLock()
+	defer api.refreshMutex.RUnlock()
+
 	req := ezhttp.Request(
 		ezhttp.Template(api.tmpl),
 		ezhttp.Method("GET"),
diff --git a/api.go b/api.go
index 8d02944..4baf609 100644
--- a/api.go
+++ b/api.go
@@ -1,8 +1,11 @@
 package omadaapi
 
 import (
+	"context"
 	"fmt"
 	"net/http"
+	"sync"
+	"time"
 
 	"git.tordarus.net/tordarus/ezhttp"
 	"git.tordarus.net/tordarus/omada-api/model"
@@ -15,6 +18,9 @@ type Api struct {
 
 	accessToken  string
 	refreshToken string
+
+	expiration   time.Time
+	refreshMutex sync.RWMutex
 }
 
 type ApiConfig struct {
@@ -61,6 +67,7 @@ func NewApi(config ApiConfig) (*Api, error) {
 		return nil, fmt.Errorf("auth token request failed: %s", authTokenResponse.Message)
 	}
 
+	api.expiration = time.Now().Add(time.Duration(authTokenResponse.Result.ExpiresIn-1) * time.Second)
 	api.accessToken = authTokenResponse.Result.AccessToken
 	api.refreshToken = authTokenResponse.Result.RefreshToken
 
@@ -73,6 +80,9 @@ func NewApi(config ApiConfig) (*Api, error) {
 }
 
 func (api *Api) Login() (*model.LoginResponse, error) {
+	api.refreshMutex.RLock()
+	defer api.refreshMutex.RUnlock()
+
 	reqBody := model.LoginRequest{
 		Username: api.config.Username,
 		Password: api.config.Password,
@@ -101,6 +111,9 @@ func (api *Api) Login() (*model.LoginResponse, error) {
 }
 
 func (api *Api) AuthCode(csrfToken, sessionID string) (*model.AuthCodeResponse, error) {
+	api.refreshMutex.RLock()
+	defer api.refreshMutex.RUnlock()
+
 	req := ezhttp.Request(
 		ezhttp.Template(api.tmpl),
 		ezhttp.Method("POST"),
@@ -124,6 +137,9 @@ func (api *Api) AuthCode(csrfToken, sessionID string) (*model.AuthCodeResponse,
 }
 
 func (api *Api) AuthToken(authCode string) (*model.AuthTokenResponse, error) {
+	api.refreshMutex.RLock()
+	defer api.refreshMutex.RUnlock()
+
 	req := ezhttp.Request(
 		ezhttp.Template(api.tmpl),
 		ezhttp.Method("POST"),
@@ -149,3 +165,52 @@ func (api *Api) AuthToken(authCode string) (*model.AuthTokenResponse, error) {
 
 	return response, nil
 }
+
+func (api *Api) AutoRefresh(ctx context.Context) error {
+	for {
+		select {
+		case <-ctx.Done():
+			return nil
+		case <-time.After(time.Until(api.expiration)):
+			if err := api.Refresh(); err != nil {
+				return err
+			}
+		}
+	}
+}
+
+func (api *Api) Refresh() error {
+	fmt.Println("refresh")
+	api.refreshMutex.Lock()
+	defer api.refreshMutex.Unlock()
+
+	req := ezhttp.Request(
+		ezhttp.Template(api.tmpl),
+		ezhttp.Method("POST"),
+		ezhttp.AppendPath("/openapi/authorize/token"),
+		ezhttp.Query(
+			"client_id", api.config.ClientID,
+			"client_secret", api.config.ClientSecret,
+			"refresh_token", api.refreshToken,
+			"grant_type", "refresh_token",
+		),
+	)
+
+	resp, err := ezhttp.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	response, err := ezhttp.ParseJsonResponse[model.AuthTokenResponse](resp.Body)
+	if err != nil {
+		return err
+	}
+
+	api.expiration = time.Now().Add(time.Duration(response.Result.ExpiresIn-1) * time.Second)
+	api.accessToken = response.Result.AccessToken
+	api.refreshToken = response.Result.RefreshToken
+
+	fmt.Println("refresh successful")
+	return nil
+}
diff --git a/client.go b/client.go
index 3b8fdcc..d94d9b9 100644
--- a/client.go
+++ b/client.go
@@ -34,6 +34,9 @@ func (api *Api) GetClients(siteID model.SiteID) <-chan *model.Client {
 }
 
 func (api *Api) getClients(page int, siteID model.SiteID) (*model.PagedResponse[model.Client], error) {
+	api.refreshMutex.RLock()
+	defer api.refreshMutex.RUnlock()
+
 	req := ezhttp.Request(
 		ezhttp.Template(api.tmpl),
 		ezhttp.Method("GET"),
diff --git a/device.go b/device.go
index 22bcf0e..e53ad75 100644
--- a/device.go
+++ b/device.go
@@ -34,6 +34,9 @@ func (api *Api) GetDevices(siteID model.SiteID) <-chan *model.Device {
 }
 
 func (api *Api) getDevices(page int, siteID model.SiteID) (*model.PagedResponse[model.Device], error) {
+	api.refreshMutex.RLock()
+	defer api.refreshMutex.RUnlock()
+
 	req := ezhttp.Request(
 		ezhttp.Template(api.tmpl),
 		ezhttp.Method("GET"),
diff --git a/site.go b/site.go
index d4dfe18..285ceb1 100644
--- a/site.go
+++ b/site.go
@@ -34,6 +34,9 @@ func (api *Api) GetSites() <-chan *model.Site {
 }
 
 func (api *Api) getSites(page int) (*model.PagedResponse[model.Site], error) {
+	api.refreshMutex.RLock()
+	defer api.refreshMutex.RUnlock()
+
 	req := ezhttp.Request(
 		ezhttp.Template(api.tmpl),
 		ezhttp.Method("GET"),