feat: more reorganisation and keys endpoint

internal/server/bootstrap/vargrab.go

@@ -0,0 +1,50 @@
+package bootstrap
+
+import (
+	"os"
+	"slices"
+	"strconv"
+)
+
+var (
+	validSyncModes = []string{
+		"sync",
+		"strict",
+		"dry",
+	}
+)
+
+// part of environment checking
+func safeStringGrab(key, fallback string) string {
+	if v, ok := os.LookupEnv(key); ok {
+		return v
+	}
+	return fallback
+}
+
+func safeIntGrab(key string, fallback int) int {
+	if v, ok := os.LookupEnv(key); ok {
+		if i, err := strconv.Atoi(v); err == nil {
+			return i
+		}
+	}
+	return fallback
+}
+
+func safeBoolGrab(key string, fallback bool) bool {
+	if v, ok := os.LookupEnv(key); ok {
+		if b, err := strconv.ParseBool(v); err == nil {
+			return b
+		}
+	}
+	return fallback
+}
+
+func safeSyncModeGrab(key, fallback string) string {
+	if v, ok := os.LookupEnv(key); ok {
+		if slices.Contains(validSyncModes, v) {
+			return v
+		}
+	}
+	return fallback
+}