feat: now able to limit ip range for token now (close #1275)

common/network/ip.go

@@ -0,0 +1,16 @@
+package network
+
+import (
+	"context"
+	"github.com/songquanpeng/one-api/common/logger"
+	"net"
+)
+
+func IsIpInSubnet(ctx context.Context, ip string, subnet string) bool {
+	_, ipNet, err := net.ParseCIDR(subnet)
+	if err != nil {
+		logger.Errorf(ctx, "failed to parse subnet: %s, subnet: %s", err.Error(), subnet)
+		return false
+	}
+	return ipNet.Contains(net.ParseIP(ip))
+}