Implement frontend api

app.go

@@ -23,4 +23,56 @@ func (a *App) startup(ctx context.Context) {
 }
 func (a *App) Close() {
 	runtime.Quit(a.ctx)
-}
+}
+
+type AddonResponse struct {
+	Data  Addon  `json:"data"`
+	Error string `json:"error,omitempty"`
+}
+type AddonsResponse struct {
+	Data  map[string]Addon `json:"data"`
+	Error string           `json:"error,omitempty"`
+}
+type StringResponse struct {
+	Data  string `json:"data"`
+	Error string `json:"error,omitempty"`
+}
+
+func (a *App) GetAddons() AddonsResponse {
+	return AddonsResponse{
+		Data:  addonService.Addons,
+		Error: "",
+	}
+}
+
+func (a *App) GetAddon(name string) AddonResponse {
+	addon, err := addonService.GetAddon(name)
+	return AddonResponse{
+		Data:  addon,
+		Error: err.Error(),
+	}
+}
+
+func (a *App) GetAddonRemoteVersion(name string) StringResponse {
+	version, err := addonService.GetRemoteVersion(name)
+	return StringResponse{
+		Data:  version,
+		Error: err.Error(),
+	}
+}
+
+func (a *App) GetAddonLocalVersion(name string) StringResponse {
+	version, err := addonService.GetLocalVersion(name)
+	return StringResponse{
+		Data:  version,
+		Error: err.Error(),
+	}
+}
+
+func (a *App) UpdateAddon(name string) AddonResponse {
+	addon, err := addonService.UpdateAddon(name)
+	return AddonResponse{
+		Data:  addon,
+		Error: err.Error(),
+	}
+}