feat: add Version method to client to provide system version information (#32)

codegen/customizations.yml

@@ -16,6 +16,10 @@ customizations:
         comment: "BaseURL returns the base URL of the controller."
         returns:
           - "string"
+      - name: "Version"
+        comment: "Version returns the version of the UniFi Controller API."
+        returns:
+          - "string"
       - name: "Do"
         comment: "Do sends a request to the controller."
         params:

unifi/client.generated.go

@@ -33,6 +33,9 @@ type Client interface {
 	// Put sends a PUT request to the controller.
 	Put(ctx context.Context, apiPath string, reqBody interface{}, respBody interface{}) error
 
+	// Version returns the version of the UniFi Controller API.
+	Version() string
+
 	// ==== client methods for APGroup resource ====
 
 	// CreateAPGroup creates a resource

unifi/client.go

@@ -153,6 +153,20 @@ func parseBaseURL(base string) (*url.URL, error) {
 	return baseURL, nil
 }
 
+func (c *client) Version() string {
+	if c.sysInfo != nil {
+		return c.sysInfo.Version
+	}
+	c.lock.Lock()
+	defer c.lock.Unlock()
+	i, err := c.GetSystemInformation()
+	if err != nil {
+		return ""
+	}
+	c.sysInfo = i
+	return c.sysInfo.Version
+}
+
 func newClientFromConfig(config *ClientConfig, v *validator) (*client, error) {
 	var rt http.RoundTripper
 	var err error