/*
Copyright 2018 The Kubernetes Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package options

import (
	"fmt"

	"github.com/spf13/pflag"

	persistentvolumeconfig "k8s.io/kubernetes/pkg/controller/volume/persistentvolume/config"
	proxyutil "k8s.io/kubernetes/pkg/proxy/util"
	netutils "k8s.io/utils/net"
)

// PersistentVolumeBinderControllerOptions holds the PersistentVolumeBinderController options.
type PersistentVolumeBinderControllerOptions struct {
	*persistentvolumeconfig.PersistentVolumeBinderControllerConfiguration
}

// AddFlags adds flags related to PersistentVolumeBinderController for controller manager to the specified FlagSet.
func (o *PersistentVolumeBinderControllerOptions) AddFlags(fs *pflag.FlagSet) {
	if o == nil {
		return
	}

	fs.DurationVar(&o.PVClaimBinderSyncPeriod.Duration, "pvclaimbinder-sync-period", o.PVClaimBinderSyncPeriod.Duration, "The period for syncing persistent volumes and persistent volume claims")
	fs.StringVar(&o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.PodTemplateFilePathNFS, "pv-recycler-pod-template-filepath-nfs", o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.PodTemplateFilePathNFS, "The file path to a pod definition used as a template for NFS persistent volume recycling")
	fs.Int32Var(&o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.MinimumTimeoutNFS, "pv-recycler-minimum-timeout-nfs", o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.MinimumTimeoutNFS, "The minimum ActiveDeadlineSeconds to use for an NFS Recycler pod")
	fs.Int32Var(&o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.IncrementTimeoutNFS, "pv-recycler-increment-timeout-nfs", o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.IncrementTimeoutNFS, "the increment of time added per Gi to ActiveDeadlineSeconds for an NFS scrubber pod")
	fs.StringVar(&o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.PodTemplateFilePathHostPath, "pv-recycler-pod-template-filepath-hostpath", o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.PodTemplateFilePathHostPath, "The file path to a pod definition used as a template for HostPath persistent volume recycling. This is for development and testing only and will not work in a multi-node cluster.")
	fs.Int32Var(&o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.MinimumTimeoutHostPath, "pv-recycler-minimum-timeout-hostpath", o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.MinimumTimeoutHostPath, "The minimum ActiveDeadlineSeconds to use for a HostPath Recycler pod.  This is for development and testing only and will not work in a multi-node cluster.")
	fs.Int32Var(&o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.IncrementTimeoutHostPath, "pv-recycler-timeout-increment-hostpath", o.VolumeConfiguration.PersistentVolumeRecyclerConfiguration.IncrementTimeoutHostPath, "the increment of time added per Gi to ActiveDeadlineSeconds for a HostPath scrubber pod.  This is for development and testing only and will not work in a multi-node cluster.")
	fs.BoolVar(&o.VolumeConfiguration.EnableHostPathProvisioning, "enable-hostpath-provisioner", o.VolumeConfiguration.EnableHostPathProvisioning, "Enable HostPath PV provisioning when running without a cloud provider. This allows testing and development of provisioning features.  HostPath provisioning is not supported in any way, won't work in a multi-node cluster, and should not be used for anything other than testing or development.")
	fs.BoolVar(&o.VolumeConfiguration.EnableDynamicProvisioning, "enable-dynamic-provisioning", o.VolumeConfiguration.EnableDynamicProvisioning, "Enable dynamic provisioning for environments that support it.")
	fs.StringVar(&o.VolumeConfiguration.FlexVolumePluginDir, "flex-volume-plugin-dir", o.VolumeConfiguration.FlexVolumePluginDir, "Full path of the directory in which the flex volume plugin should search for additional third party volume plugins.")
	fs.StringSliceVar(&o.VolumeHostCIDRDenylist, "volume-host-cidr-denylist", o.VolumeHostCIDRDenylist, "A comma-separated list of CIDR ranges to avoid from volume plugins.")
	fs.BoolVar(&o.VolumeHostAllowLocalLoopback, "volume-host-allow-local-loopback", o.VolumeHostAllowLocalLoopback, "If false, deny local loopback IPs in addition to any CIDR ranges in --volume-host-cidr-denylist")
}

// ApplyTo fills up PersistentVolumeBinderController config with options.
func (o *PersistentVolumeBinderControllerOptions) ApplyTo(cfg *persistentvolumeconfig.PersistentVolumeBinderControllerConfiguration) error {
	if o == nil {
		return nil
	}

	cfg.PVClaimBinderSyncPeriod = o.PVClaimBinderSyncPeriod
	cfg.VolumeConfiguration = o.VolumeConfiguration
	cfg.VolumeHostCIDRDenylist = o.VolumeHostCIDRDenylist
	cfg.VolumeHostAllowLocalLoopback = o.VolumeHostAllowLocalLoopback

	return nil
}

// Validate checks validation of PersistentVolumeBinderControllerOptions.
func (o *PersistentVolumeBinderControllerOptions) Validate() []error {
	if o == nil {
		return nil
	}

	errs := []error{}
	if _, err := ParseVolumeHostFilters(o.VolumeHostCIDRDenylist, o.VolumeHostAllowLocalLoopback); err != nil {
		errs = append(errs, fmt.Errorf("Bad --volume-host-ip-denylist/--volume-host-allow-local-loopback %w", err))
	}
	return errs
}

// ParseVolumeHostFilters process the --volume-host-ip-denylist and --volume-host-allow-local-loopback flags.
func ParseVolumeHostFilters(denylist []string, allowLocalLoopback bool) (*proxyutil.FilteredDialOptions, error) {
	denyCIDRs, err := netutils.ParseCIDRs(denylist)
	if err != nil {
		return nil, err
	}
	return &proxyutil.FilteredDialOptions{DialHostCIDRDenylist: denyCIDRs, AllowLocalLoopback: allowLocalLoopback}, nil
}
