/*
Copyright 2017 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 networking

import (
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/util/intstr"
	api "k8s.io/kubernetes/pkg/apis/core"
)

// +genclient
// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object

// NetworkPolicy describes what network traffic is allowed for a set of Pods
type NetworkPolicy struct {
	metav1.TypeMeta
	// +optional
	metav1.ObjectMeta

	// Specification of the desired behavior for this NetworkPolicy.
	// +optional
	Spec NetworkPolicySpec
}

// Policy Type string describes the NetworkPolicy type
// This type is beta-level in 1.8
type PolicyType string

const (
	// PolicyTypeIngress is a NetworkPolicy that affects ingress traffic on selected pods
	PolicyTypeIngress PolicyType = "Ingress"
	// PolicyTypeEgress is a NetworkPolicy that affects egress traffic on selected pods
	PolicyTypeEgress PolicyType = "Egress"
)

// NetworkPolicySpec provides the specification of a NetworkPolicy
type NetworkPolicySpec struct {
	// Selects the pods to which this NetworkPolicy object applies. The array of
	// ingress rules is applied to any pods selected by this field. Multiple network
	// policies can select the same set of pods. In this case, the ingress rules for
	// each are combined additively. This field is NOT optional and follows standard
	// label selector semantics. An empty podSelector matches all pods in this
	// namespace.
	PodSelector metav1.LabelSelector

	// List of ingress rules to be applied to the selected pods. Traffic is allowed to
	// a pod if there are no NetworkPolicies selecting the pod
	// (and cluster policy otherwise allows the traffic), OR if the traffic source is
	// the pod's local node, OR if the traffic matches at least one ingress rule
	// across all of the NetworkPolicy objects whose podSelector matches the pod. If
	// this field is empty then this NetworkPolicy does not allow any traffic (and serves
	// solely to ensure that the pods it selects are isolated by default)
	// +optional
	Ingress []NetworkPolicyIngressRule

	// List of egress rules to be applied to the selected pods. Outgoing traffic is
	// allowed if there are no NetworkPolicies selecting the pod (and cluster policy
	// otherwise allows the traffic), OR if the traffic matches at least one egress rule
	// across all of the NetworkPolicy objects whose podSelector matches the pod. If
	// this field is empty then this NetworkPolicy limits all outgoing traffic (and serves
	// solely to ensure that the pods it selects are isolated by default).
	// This field is beta-level in 1.8
	// +optional
	Egress []NetworkPolicyEgressRule

	// List of rule types that the NetworkPolicy relates to.
	// Valid options are Ingress, Egress, or Ingress,Egress.
	// If this field is not specified, it will default based on the existence of Ingress or Egress rules;
	// policies that contain an Egress section are assumed to affect Egress, and all policies
	// (whether or not they contain an Ingress section) are assumed to affect Ingress.
	// If you want to write an egress-only policy, you must explicitly specify policyTypes [ "Egress" ].
	// Likewise, if you want to write a policy that specifies that no egress is allowed,
	// you must specify a policyTypes value that include "Egress" (since such a policy would not include
	// an Egress section and would otherwise default to just [ "Ingress" ]).
	// This field is beta-level in 1.8
	// +optional
	PolicyTypes []PolicyType
}

// NetworkPolicyIngressRule describes a particular set of traffic that is allowed to the pods
// matched by a NetworkPolicySpec's podSelector. The traffic must match both ports and from.
type NetworkPolicyIngressRule struct {
	// List of ports which should be made accessible on the pods selected for this
	// rule. Each item in this list is combined using a logical OR. If this field is
	// empty or missing, this rule matches all ports (traffic not restricted by port).
	// If this field is present and contains at least one item, then this rule allows
	// traffic only if the traffic matches at least one port in the list.
	// +optional
	Ports []NetworkPolicyPort

	// List of sources which should be able to access the pods selected for this rule.
	// Items in this list are combined using a logical OR operation. If this field is
	// empty or missing, this rule matches all sources (traffic not restricted by
	// source). If this field is present and contains at least on item, this rule
	// allows traffic only if the traffic matches at least one item in the from list.
	// +optional
	From []NetworkPolicyPeer
}

// NetworkPolicyEgressRule describes a particular set of traffic that is allowed out of pods
// matched by a NetworkPolicySpec's podSelector. The traffic must match both ports and to.
// This type is beta-level in 1.8
type NetworkPolicyEgressRule struct {
	// List of destination ports for outgoing traffic.
	// Each item in this list is combined using a logical OR. If this field is
	// empty or missing, this rule matches all ports (traffic not restricted by port).
	// If this field is present and contains at least one item, then this rule allows
	// traffic only if the traffic matches at least one port in the list.
	// +optional
	Ports []NetworkPolicyPort

	// List of destinations for outgoing traffic of pods selected for this rule.
	// Items in this list are combined using a logical OR operation. If this field is
	// empty or missing, this rule matches all destinations (traffic not restricted by
	// destination). If this field is present and contains at least one item, this rule
	// allows traffic only if the traffic matches at least one item in the to list.
	// +optional
	To []NetworkPolicyPeer
}

// NetworkPolicyPort describes a port to allow traffic on
type NetworkPolicyPort struct {
	// The protocol (TCP, UDP, or SCTP) which traffic must match. If not specified, this
	// field defaults to TCP.
	// +optional
	Protocol *api.Protocol

	// The port on the given protocol. This can either be a numerical or named port on
	// a pod. If this field is not provided, this matches all port names and numbers.
	// +optional
	Port *intstr.IntOrString
}

// IPBlock describes a particular CIDR (Ex. "192.168.1.1/24") that is allowed to the pods
// matched by a NetworkPolicySpec's podSelector. The except entry describes CIDRs that should
// not be included within this rule.
type IPBlock struct {
	// CIDR is a string representing the IP Block
	// Valid examples are "192.168.1.1/24"
	CIDR string
	// Except is a slice of CIDRs that should not be included within an IP Block
	// Valid examples are "192.168.1.1/24"
	// Except values will be rejected if they are outside the CIDR range
	// +optional
	Except []string
}

// NetworkPolicyPeer describes a peer to allow traffic from.
type NetworkPolicyPeer struct {
	// This is a label selector which selects Pods. This field follows standard label
	// selector semantics; if present but empty, it selects all pods.
	//
	// If NamespaceSelector is also set, then the NetworkPolicyPeer as a whole selects
	// the Pods matching PodSelector in the Namespaces selected by NamespaceSelector.
	// Otherwise it selects the Pods matching PodSelector in the policy's own Namespace.
	// +optional
	PodSelector *metav1.LabelSelector

	// Selects Namespaces using cluster-scoped labels. This field follows standard label
	// selector semantics; if present but empty, it selects all namespaces.
	//
	// If PodSelector is also set, then the NetworkPolicyPeer as a whole selects
	// the Pods matching PodSelector in the Namespaces selected by NamespaceSelector.
	// Otherwise it selects all Pods in the Namespaces selected by NamespaceSelector.
	// +optional
	NamespaceSelector *metav1.LabelSelector

	// IPBlock defines policy on a particular IPBlock. If this field is set then
	// neither of the other fields can be.
	// +optional
	IPBlock *IPBlock
}

// +k8s:deepcopy-gen:interfaces=k8s.io/apimachinery/pkg/runtime.Object

// NetworkPolicyList is a list of NetworkPolicy objects.
type NetworkPolicyList struct {
	metav1.TypeMeta
	// +optional
	metav1.ListMeta

	Items []NetworkPolicy
}
