Don't obliterate custom SSL locations if defined

closes pterodactyl/panel#2121

router/router_system.go

@@ -9,6 +9,7 @@ import (
 	"github.com/pterodactyl/wings/server"
 	"github.com/pterodactyl/wings/system"
 	"net/http"
+	"strings"
 )
 
 // Returns information about the system that wings is running on.
@@ -78,6 +79,16 @@ func postUpdateConfiguration(c *gin.Context) {
 		return
 	}
 
+	// Keep the SSL certificates the same since the Panel will send through Lets Encrypt
+	// default locations. However, if we picked a different location manually we don't
+	// want to override that.
+	//
+	// If you pass through manual locations in the API call this logic will be skipped.
+	if strings.HasPrefix(cfg.Api.Ssl.KeyFile, "/etc/letsencrypt/live/") {
+		cfg.Api.Ssl.KeyFile = ccopy.Api.Ssl.KeyFile
+		cfg.Api.Ssl.CertificateFile = ccopy.Api.Ssl.CertificateFile
+	}
+
 	config.Set(&cfg)
 	if err := config.Get().WriteToDisk(); err != nil {
 		// If there was an error writing to the disk, revert back to the configuration we had