Update config.go

cmd/api/config.go

@@ -1,11 +1,13 @@
 package api
 
 import (
-	"github.com/AlexxIT/go2rtc/cmd/app"
-	"gopkg.in/yaml.v3"
 	"io"
+	"io/ioutil"
 	"net/http"
 	"os"
+
+	"github.com/AlexxIT/go2rtc/cmd/app"
+	"gopkg.in/yaml.v3"
 )
 
 func configHandler(w http.ResponseWriter, r *http.Request) {
@@ -38,5 +40,73 @@ func configHandler(w http.ResponseWriter, r *http.Request) {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 			return
 		}
+	case "PATCH":
+		rawdata, err := io.ReadAll(r.Body)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		data, err := mergeYAML(app.ConfigPath, rawdata)
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		// validate config
+		var tmp struct{}
+		if err = yaml.Unmarshal(data, &tmp); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		if err = os.WriteFile(app.ConfigPath, data, 0644); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
 		}
 	}
+}
+
+func mergeYAML(file1 string, yaml2 []byte) ([]byte, error) {
+	// Read the contents of the first YAML file
+	data1, err := ioutil.ReadFile(file1)
+	if err != nil {
+		return nil, err
+	}
+	// Unmarshal the first YAML file into a map
+	var config1 map[string]interface{}
+	err = yaml.Unmarshal(data1, &config1)
+	if err != nil {
+		return nil, err
+	}
+	// Unmarshal the second YAML document into a map
+	var config2 map[string]interface{}
+	err = yaml.Unmarshal(yaml2, &config2)
+	if err != nil {
+		return nil, err
+	}
+	// Merge the two maps
+	config1 = merge(config1, config2)
+	// Marshal the merged map into YAML
+	return yaml.Marshal(&config1)
+}
+
+func merge(a, b map[string]interface{}) map[string]interface{} {
+	for k, v := range b {
+		if vv, ok := a[k]; ok {
+			switch vv := vv.(type) {
+			case map[string]interface{}:
+				v := v.(map[string]interface{})
+				a[k] = merge(vv, v)
+			case []interface{}:
+				v := v.([]interface{})
+				a[k] = v
+			default:
+				a[k] = v
+			}
+		} else {
+			a[k] = v
+		}
+	}
+	return a
+}