Implement passing user configuration

This allows overwriting values of the default configuration with custom
ones.

1 files changed, 25 insertions, 1 deletions

diff --git a/config.go b/config.go
index 7d3cab8..dfea550 100644
--- a/config.go
+++ b/config.go
@@ -7,6 +7,7 @@ import (
 	"log"
 	"net"
 	"net/url"
+	"os"
 	"regexp"
 	"strconv"
 	"time"
@@ -120,7 +121,21 @@ func (sc *StartupConfig) FromJSON(data []byte) error {
 	return nil
 }
 
-func GetStartupConfig() StartupConfig {
+func (sc *StartupConfig) FromFile(path string) error {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return fmt.Errorf("Failed to read config file '%s': %w", path, err)
+	}
+
+	err = sc.FromJSON(data)
+	if err != nil {
+		return fmt.Errorf("Could not parse config file '%s': %w", path, err)
+	}
+
+	return nil
+}
+
+func GetStartupConfig(path string) StartupConfig {
 	config := StartupConfig{}
 
 	err := config.FromJSON(defaultConfig)
@@ -128,5 +143,14 @@ func GetStartupConfig() StartupConfig {
 		log.Fatalf("Could not parse default config: %v", err)
 	}
 
+	if path != "" {
+		log.Printf("Config path: %s", path)
+
+		err = config.FromFile(path)
+		if err != nil {
+			log.Fatalf("Failed to read configuration: %v", err)
+		}
+	}
+
 	return config
 }