Moving to kube, refactoring code, using env variables only, adding metrics exporter

app/Tools/utils.go

@@ -0,0 +1,60 @@
+package Tools
+
+import (
+	"log"
+	"net/netip"
+	"os"
+	"strings"
+
+	"github.com/joho/godotenv"
+)
+
+var (
+	// ClientList contains IPs/networks authorized to do purge/ban
+	ClientList []netip.Prefix
+)
+
+// ReadDotEnvFile reads environment variables from .env file
+func ReadDotEnvFile(f string) {
+	err := godotenv.Load(f)
+	if err != nil {
+		log.Fatal("Error loading .env file")
+	}
+}
+
+// InitLog ensure log file exists and set appropriate flags (remove timestamp at start of line).
+func InitLog(p string) {
+	logFile, err := os.OpenFile(p, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+	if err != nil {
+		panic(err)
+	}
+	log.SetOutput(logFile)
+	log.SetFlags(log.Flags() &^ (log.Ldate | log.Ltime))
+}
+
+// InitAllowedIPList initialize the list of client authorized to do purge/ban requests
+func InitAllowedIPList(l string) []netip.Prefix {
+	list := []netip.Prefix{}
+	if l != "" {
+		sliceData := strings.Split(l, ",")
+		for i := 0; i < len(sliceData); i++ {
+			t, err := netip.ParsePrefix(sliceData[i])
+			if err != nil {
+				panic(err)
+			}
+			list = append(list, t)
+		}
+		return list
+	}
+	return list
+}
+
+// IPAllowed check if the IP is authorized to do BAN/PURGE requests
+func IPAllowed(ip netip.Addr) bool {
+	for i := 0; i < len(ClientList); i++ {
+		if ClientList[i].Contains(ip) {
+			return true
+		}
+	}
+	return false
+}