feat: allow setting unix socket mode (#661)

backend/internal/bootstrap/router_bootstrap.go

@@ -7,6 +7,8 @@ import (
 	"log"
 	"net"
 	"net/http"
+	"os"
+	"strconv"
 	"time"
 
 	"github.com/pocket-id/pocket-id/backend/frontend"
@@ -119,6 +121,18 @@ func initRouterInternal(db *gorm.DB, svc *services) (utils.Service, error) {
 		return nil, fmt.Errorf("failed to create %s listener: %w", network, err)
 	}
 
+	// Set the socket mode if using a Unix socket
+	if network == "unix" && common.EnvConfig.UnixSocketMode != "" {
+		mode, err := strconv.ParseUint(common.EnvConfig.UnixSocketMode, 8, 32)
+		if err != nil {
+			return nil, fmt.Errorf("failed to parse UNIX socket mode '%s': %w", common.EnvConfig.UnixSocketMode, err)
+		}
+
+		if err := os.Chmod(addr, os.FileMode(mode)); err != nil {
+			return nil, fmt.Errorf("failed to set UNIX socket mode '%s': %w", common.EnvConfig.UnixSocketMode, err)
+		}
+	}
+
 	// Service runner function
 	runFn := func(ctx context.Context) error {
 		log.Printf("Server listening on %s", addr)

backend/internal/common/env_config.go

@@ -33,6 +33,7 @@ type EnvConfigSchema struct {
 	Port               string     `env:"PORT"`
 	Host               string     `env:"HOST"`
 	UnixSocket         string     `env:"UNIX_SOCKET"`
+	UnixSocketMode     string     `env:"UNIX_SOCKET_MODE"`
 	MaxMindLicenseKey  string     `env:"MAXMIND_LICENSE_KEY"`
 	GeoLiteDBPath      string     `env:"GEOLITE_DB_PATH"`
 	GeoLiteDBUrl       string     `env:"GEOLITE_DB_URL"`
@@ -53,6 +54,7 @@ var EnvConfig = &EnvConfigSchema{
 	Port:               "1411",
 	Host:               "0.0.0.0",
 	UnixSocket:         "",
+	UnixSocketMode:     "",
 	MaxMindLicenseKey:  "",
 	GeoLiteDBPath:      "data/GeoLite2-City.mmdb",
 	GeoLiteDBUrl:       MaxMindGeoLiteCityUrl,