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in.go
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in.go
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package operator
import (
"encoding/json"
"fmt"
"github.com/minio/pkg/wildcard"
"github.com/go-logr/logr"
"github.com/kyverno/kyverno/pkg/engine/context"
)
//NewInHandler returns handler to manage In operations
func NewInHandler(log logr.Logger, ctx context.EvalInterface) OperatorHandler {
return InHandler{
ctx: ctx,
log: log,
}
}
//InHandler provides implementation to handle In Operator
type InHandler struct {
ctx context.EvalInterface
log logr.Logger
}
//Evaluate evaluates expression with In Operator
func (in InHandler) Evaluate(key, value interface{}) bool {
switch typedKey := key.(type) {
case string:
return in.validateValueWithStringPattern(typedKey, value)
case []interface{}:
var stringSlice []string
for _, v := range typedKey {
stringSlice = append(stringSlice, v.(string))
}
return in.validateValueWithStringSetPattern(stringSlice, value)
default:
in.log.Info("Unsupported type", "value", typedKey, "type", fmt.Sprintf("%T", typedKey))
return false
}
}
func (in InHandler) validateValueWithStringPattern(key string, value interface{}) (keyExists bool) {
invalidType, keyExists := keyExistsInArray(key, value, in.log)
if invalidType {
in.log.Info("expected type []string", "value", value, "type", fmt.Sprintf("%T", value))
return false
}
return keyExists
}
// keyExistsInArray checks if the key exists in the array value
// The value can be a string, an array of strings, or a JSON format
// array of strings (e.g. ["val1", "val2", "val3"].
func keyExistsInArray(key string, value interface{}, log logr.Logger) (invalidType bool, keyExists bool) {
switch valuesAvailable := value.(type) {
case []interface{}:
for _, val := range valuesAvailable {
v, ok := val.(string)
if !ok {
return true, false
}
if ok && wildcard.Match(key, v) {
return false, true
}
}
case string:
if wildcard.Match(valuesAvailable, key) {
return false, true
}
var arr []string
if err := json.Unmarshal([]byte(valuesAvailable), &arr); err != nil {
log.Error(err, "failed to unmarshal value to JSON string array", "key", key, "value", value)
return true, false
}
for _, val := range arr {
if key == val {
return false, true
}
}
default:
invalidType = true
return
}
return false, false
}
func (in InHandler) validateValueWithStringSetPattern(key []string, value interface{}) (keyExists bool) {
invalidType, isIn := setExistsInArray(key, value, in.log, false)
if invalidType {
in.log.Info("expected type []string", "value", value, "type", fmt.Sprintf("%T", value))
return false
}
return isIn
}
// setExistsInArray checks if the key is a subset of value
// The value can be a string, an array of strings, or a JSON format
// array of strings (e.g. ["val1", "val2", "val3"].
// notIn argument if set to true will check for NotIn
func setExistsInArray(key []string, value interface{}, log logr.Logger, notIn bool) (invalidType bool, keyExists bool) {
switch valuesAvailable := value.(type) {
case []interface{}:
var valueSlice []string
for _, val := range valuesAvailable {
v, ok := val.(string)
if !ok {
return true, false
}
valueSlice = append(valueSlice, v)
}
if notIn {
return false, isNotIn(key, valueSlice)
}
return false, isIn(key, valueSlice)
case string:
if len(key) == 1 && key[0] == valuesAvailable {
return false, true
}
var arr []string
if err := json.Unmarshal([]byte(valuesAvailable), &arr); err != nil {
log.Error(err, "failed to unmarshal value to JSON string array", "key", key, "value", value)
return true, false
}
if notIn {
return false, isNotIn(key, arr)
}
return false, isIn(key, arr)
default:
return true, false
}
}
// isIn checks if all values in S1 are in S2
func isIn(key []string, value []string) bool {
set := make(map[string]bool)
for _, val := range value {
set[val] = true
}
for _, val := range key {
_, found := set[val]
if !found {
return false
}
}
return true
}
// isNotIn checks if any of the values in S1 is not in S2
func isNotIn(key []string, value []string) bool {
set := make(map[string]bool)
for _, val := range value {
set[val] = true
}
for _, val := range key {
_, found := set[val]
if !found {
return true
}
}
return false
}
func (in InHandler) validateValueWithBoolPattern(_ bool, _ interface{}) bool {
return false
}
func (in InHandler) validateValueWithIntPattern(_ int64, _ interface{}) bool {
return false
}
func (in InHandler) validateValueWithFloatPattern(_ float64, _ interface{}) bool {
return false
}
func (in InHandler) validateValueWithMapPattern(_ map[string]interface{}, _ interface{}) bool {
return false
}
func (in InHandler) validateValueWithSlicePattern(_ []interface{}, _ interface{}) bool {
return false
}