lxc/client: Add GetMetadataConfiguration method

Signed-off-by: Kadin Sayani <[email protected]>

client/interfaces.go

@@ -73,6 +73,7 @@ type InstanceServer interface {
 	ImageServer
 
 	// Server functions
+    GetMetadataConfiguration() (config *map[string]any, err error)
 	GetMetrics() (metrics string, err error)
 	GetServer() (server *api.Server, ETag string, err error)
 	GetServerResources() (resources *api.Resources, err error)

client/lxd_server.go

@@ -1,6 +1,7 @@
 package lxd
 
 import (
+    "encoding/json"
 	"fmt"
 	"io"
 	"net/http"
@@ -186,3 +187,50 @@ func (r *ProtocolLXD) GetMetrics() (string, error) {
 
 	return string(content), nil
 }
+
+// GetMetadataConfiguration returns metadata configuration for a server.
+func (r *ProtocolLXD) GetMetadataConfiguration() (*map[string]any, error) {
+    // Check that the server supports it.
+	err := r.CheckExtension("metadata_configuration")
+	if err != nil {
+		return nil, err
+	}
+
+	// Prepare the request.
+	requestURL, err := r.setQueryAttributes(fmt.Sprintf("%s/1.0/metadata/configuration", r.httpBaseURL.String()))
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest("GET", requestURL, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Send the request.
+	resp, err := r.DoHTTP(req)
+	if err != nil {
+		return nil, err
+	}
+
+	defer func() { _ = resp.Body.Close() }()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("Bad HTTP status: %d", resp.StatusCode)
+	}
+
+	// Get the content.
+	content, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+    // Unmarshal content.
+    config := make(map[string]any)
+    err = json.Unmarshal(content, &config)
+    if err != nil {
+        return nil, err
+    }
+
+    return &config, nil
+}