Feature/1515 - handle configmap and api variable cli (#1789)

* added store package

Signed-off-by: NoSkillGirl <singhpooja240393@gmail.com>

* added changes to handle api and configmap variables in cli

Signed-off-by: NoSkillGirl <singhpooja240393@gmail.com>

* removed comments

Signed-off-by: NoSkillGirl <singhpooja240393@gmail.com>

* refactoring code

Signed-off-by: NoSkillGirl <singhpooja240393@gmail.com>

* added test case for mutation

Signed-off-by: NoSkillGirl <singhpooja240393@gmail.com>

* added test case for validation

Signed-off-by: NoSkillGirl <singhpooja240393@gmail.com>

* code improvement

Signed-off-by: NoSkillGirl <singhpooja240393@gmail.com>

pkg/common/common.go

@@ -2,6 +2,7 @@ package common
 
 import (
 	"encoding/json"
+	"fmt"
 	"strings"
 
 	"github.com/go-logr/logr"
@@ -77,3 +78,33 @@ func GetKindFromGVK(str string) (apiVersion string, kind string) {
 	}
 	return splitString[0] + "/" + splitString[1], splitString[2]
 }
+
+func VariableToJSON(key, value string) []byte {
+	var subString string
+	splitBySlash := strings.Split(key, "\"")
+	if len(splitBySlash) > 1 {
+		subString = splitBySlash[1]
+	}
+
+	startString := ""
+	endString := ""
+	lenOfVariableString := 0
+	addedSlashString := false
+	for _, k := range strings.Split(splitBySlash[0], ".") {
+		if k != "" {
+			startString += fmt.Sprintf(`{"%s":`, k)
+			endString += `}`
+			lenOfVariableString = lenOfVariableString + len(k) + 1
+			if lenOfVariableString >= len(splitBySlash[0]) && len(splitBySlash) > 1 && !addedSlashString {
+				startString += fmt.Sprintf(`{"%s":`, subString)
+				endString += `}`
+				addedSlashString = true
+			}
+		}
+	}
+
+	midString := fmt.Sprintf(`"%s"`, value)
+	finalString := startString + midString + endString
+	var jsonData = []byte(finalString)
+	return jsonData
+}

pkg/engine/generation.go

@@ -87,7 +87,7 @@ func filterRule(rule kyverno.Rule, policyContext *PolicyContext) *response.RuleR
 	policyContext.JSONContext.Checkpoint()
 	defer policyContext.JSONContext.Restore()
 
-	if err := LoadContext(logger, rule.Context, resCache, policyContext); err != nil {
+	if err := LoadContext(logger, rule.Context, resCache, policyContext, rule.Name); err != nil {
 		logger.V(4).Info("cannot add external data to the context", "reason", err.Error())
 		return nil
 	}

pkg/engine/jsonContext.go

@@ -9,19 +9,34 @@ import (
 
 	"github.com/go-logr/logr"
 	kyverno "github.com/kyverno/kyverno/pkg/api/kyverno/v1"
+	pkgcommon "github.com/kyverno/kyverno/pkg/common"
 	"github.com/kyverno/kyverno/pkg/engine/context"
 	jmespath "github.com/kyverno/kyverno/pkg/engine/jmespath"
 	"github.com/kyverno/kyverno/pkg/engine/variables"
+	"github.com/kyverno/kyverno/pkg/kyverno/store"
 	"github.com/kyverno/kyverno/pkg/resourcecache"
 	"k8s.io/client-go/dynamic/dynamiclister"
 )
 
 // LoadContext - Fetches and adds external data to the Context.
-func LoadContext(logger logr.Logger, contextEntries []kyverno.ContextEntry, resCache resourcecache.ResourceCache, ctx *PolicyContext) error {
+func LoadContext(logger logr.Logger, contextEntries []kyverno.ContextEntry, resCache resourcecache.ResourceCache, ctx *PolicyContext, ruleName string) error {
 	if len(contextEntries) == 0 {
 		return nil
 	}
 
+	policyName := ctx.Policy.Name
+	if store.GetMock() {
+		rule := store.GetPolicyRuleFromContext(policyName, ruleName)
+		variables := rule.Values
+
+		for key, value := range variables {
+			jsonData := pkgcommon.VariableToJSON(key, value)
+			if err := ctx.JSONContext.AddJSON(jsonData); err != nil {
+				return err
+			}
+		}
+
+	} else {
 		// get GVR Cache for "configmaps"
 		// can get cache for other resources if the informers are enabled in resource cache
 		gvrC, ok := resCache.GetGVRCache("ConfigMap")
@@ -42,7 +57,7 @@ func LoadContext(logger logr.Logger, contextEntries []kyverno.ContextEntry, resC
 				}
 			}
 		}
-
+	}
 	return nil
 }
 

pkg/engine/mutation.go

@@ -72,7 +72,7 @@ func Mutate(policyContext *PolicyContext) (resp *response.EngineResponse) {
 		logger.V(3).Info("matched mutate rule")
 
 		policyContext.JSONContext.Restore()
-		if err := LoadContext(logger, rule.Context, resCache, policyContext); err != nil {
+		if err := LoadContext(logger, rule.Context, resCache, policyContext, rule.Name); err != nil {
 			logger.Error(err, "failed to load context")
 			continue
 		}

pkg/engine/mutation_test.go

@@ -8,6 +8,7 @@ import (
 	kyverno "github.com/kyverno/kyverno/pkg/api/kyverno/v1"
 	"github.com/kyverno/kyverno/pkg/engine/context"
 	"github.com/kyverno/kyverno/pkg/engine/utils"
+	"github.com/kyverno/kyverno/pkg/kyverno/store"
 	"gotest.tools/assert"
 )
 
@@ -164,3 +165,104 @@ func Test_variableSubstitutionPathNotExist(t *testing.T) {
 	t.Log(er.PolicyResponse.Rules[0].Message)
 	assert.Equal(t, er.PolicyResponse.Rules[0].Message, expectedErrorStr)
 }
+
+func Test_variableSubstitutionCLI(t *testing.T) {
+	resourceRaw := []byte(`{
+		"apiVersion": "v1",
+		"kind": "Pod",
+		"metadata": {
+		  "name": "nginx-config-test"
+		},
+		"spec": {
+		  "containers": [
+			{
+			  "image": "nginx:latest",
+			  "name": "test-nginx"
+			}
+		  ]
+		}
+	}`)
+
+	policyraw := []byte(`{
+		"apiVersion": "kyverno.io/v1",
+		"kind": "ClusterPolicy",
+		"metadata": {
+		  "name": "cm-variable-example"
+		},
+		"spec": {
+		  "rules": [
+			{
+			  "name": "example-configmap-lookup",
+			  "context": [
+				{
+				  "name": "dictionary",
+				  "configMap": {
+					"name": "mycmap",
+					"namespace": "default"
+				  }
+				}
+			  ],
+			  "match": {
+				"resources": {
+				  "kinds": [
+					"Pod"
+				  ]
+				}
+			  },
+			  "mutate": {
+				"patchStrategicMerge": {
+				  "metadata": {
+					"labels": {
+					  "my-environment-name": "{{dictionary.data.env}}"
+					}
+				  }
+				}
+			  }
+			}
+		  ]
+		}
+	  }`)
+
+	configMapVariableContext := store.Context{
+		Policies: []store.Policy{
+			{
+				Name: "cm-variable-example",
+				Rules: []store.Rule{
+					{
+						Name: "example-configmap-lookup",
+						Values: map[string]string{
+							"dictionary.data.env": "dev1",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	expectedPatch := []byte(`{"op":"add","path":"/metadata/labels","value":{"my-environment-name":"dev1"}}`)
+
+	store.SetContext(configMapVariableContext)
+	store.SetMock(true)
+	var policy kyverno.ClusterPolicy
+	err := json.Unmarshal(policyraw, &policy)
+	assert.NilError(t, err)
+	resourceUnstructured, err := utils.ConvertToUnstructured(resourceRaw)
+	assert.NilError(t, err)
+
+	ctx := context.NewContext()
+	err = ctx.AddResource(resourceRaw)
+	assert.NilError(t, err)
+
+	policyContext := &PolicyContext{
+		Policy:      policy,
+		JSONContext: ctx,
+		NewResource: *resourceUnstructured,
+	}
+
+	er := Mutate(policyContext)
+	t.Log(string(expectedPatch))
+	t.Log(string(er.PolicyResponse.Rules[0].Patches[0]))
+	if !reflect.DeepEqual(expectedPatch, er.PolicyResponse.Rules[0].Patches[0]) {
+		t.Error("patches dont match")
+	}
+}

pkg/engine/validation.go

@@ -97,7 +97,7 @@ func validateResource(log logr.Logger, ctx *PolicyContext) *response.EngineRespo
 		}
 
 		ctx.JSONContext.Restore()
-		if err := LoadContext(log, rule.Context, ctx.ResourceCache, ctx); err != nil {
+		if err := LoadContext(log, rule.Context, ctx.ResourceCache, ctx, rule.Name); err != nil {
 			log.Error(err, "failed to load context")
 			continue
 		}

pkg/engine/validation_test.go

@@ -7,6 +7,7 @@ import (
 	kyverno "github.com/kyverno/kyverno/pkg/api/kyverno/v1"
 	"github.com/kyverno/kyverno/pkg/engine/context"
 	"github.com/kyverno/kyverno/pkg/engine/utils"
+	"github.com/kyverno/kyverno/pkg/kyverno/store"
 	utils2 "github.com/kyverno/kyverno/pkg/utils"
 	"gotest.tools/assert"
 	"k8s.io/api/admission/v1beta1"
@@ -2141,3 +2142,103 @@ func executeTest(t *testing.T, err error, test testCase) {
 		t.Errorf("Testcase has failed, policy: %v", policy.Name)
 	}
 }
+
+func TestValidate_context_variable_substitution_CLI(t *testing.T) {
+	rawPolicy := []byte(`{
+		"apiVersion": "kyverno.io/v1",
+		"kind": "ClusterPolicy",
+		"metadata": {
+		  "name": "restrict-pod-count"
+		},
+		"spec": {
+		  "validationFailureAction": "enforce",
+		  "background": false,
+		  "rules": [
+			{
+			  "name": "restrict-pod-count",
+			  "match": {
+				"resources": {
+				  "kinds": [
+					"Pod"
+				  ]
+				}
+			  },
+			  "context": [
+				{
+				  "name": "podcounts",
+				  "apiCall": {
+					"urlPath": "/api/v1/pods",
+					"jmesPath": "items[?spec.nodeName=='minikube'] | length(@)"
+				  }
+				}
+			  ],
+			  "validate": {
+				"message": "restrict pod counts to be no more than 10 on node minikube",
+				"deny": {
+				  "conditions": [
+					{
+					  "key": "{{ podcounts }}",
+					  "operator": "GreaterThanOrEquals",
+					  "value": 10
+					}
+				  ]
+				}
+			  }
+			}
+		  ]
+		}
+	  }
+	`)
+
+	rawResource := []byte(`
+	{
+		"apiVersion": "v1",
+		"kind": "Pod",
+		"metadata": {
+		  "name": "nginx-config-test"
+		},
+		"spec": {
+		  "containers": [
+			{
+			  "image": "nginx:latest",
+			  "name": "test-nginx"
+			}
+		  ]
+		}
+	  }
+	`)
+
+	configMapVariableContext := store.Context{
+		Policies: []store.Policy{
+			{
+				Name: "restrict-pod-count",
+				Rules: []store.Rule{
+					{
+						Name: "restrict-pod-count",
+						Values: map[string]string{
+							"podcounts": "12",
+						},
+					},
+				},
+			},
+		},
+	}
+
+	store.SetContext(configMapVariableContext)
+	store.SetMock(true)
+
+	var policy kyverno.ClusterPolicy
+	err := json.Unmarshal(rawPolicy, &policy)
+	assert.NilError(t, err)
+
+	resourceUnstructured, err := utils.ConvertToUnstructured(rawResource)
+	assert.NilError(t, err)
+	msgs := []string{
+		"restrict pod counts to be no more than 10 on node minikube",
+	}
+	er := Validate(&PolicyContext{Policy: policy, NewResource: *resourceUnstructured, JSONContext: context.NewContext()})
+	for index, r := range er.PolicyResponse.Rules {
+		assert.Equal(t, r.Message, msgs[index])
+	}
+	assert.Assert(t, !er.IsSuccessful())
+}

pkg/generate/generate.go

@@ -221,7 +221,7 @@ func (c *Controller) applyGeneratePolicy(log logr.Logger, policyContext *engine.
 		}
 
 		// add configmap json data to context
-		if err := engine.LoadContext(log, rule.Context, resCache, policyContext); err != nil {
+		if err := engine.LoadContext(log, rule.Context, resCache, policyContext, rule.Name); err != nil {
 			log.Error(err, "cannot add configmaps to context")
 			return nil, err
 		}

pkg/kyverno/apply/command.go

@@ -15,6 +15,7 @@ import (
 	"github.com/kyverno/kyverno/pkg/engine/response"
 	"github.com/kyverno/kyverno/pkg/kyverno/common"
 	sanitizederror "github.com/kyverno/kyverno/pkg/kyverno/sanitizedError"
+	"github.com/kyverno/kyverno/pkg/kyverno/store"
 	"github.com/kyverno/kyverno/pkg/openapi"
 	policy2 "github.com/kyverno/kyverno/pkg/policy"
 	"github.com/spf13/cobra"
@@ -148,6 +149,7 @@ func Command() *cobra.Command {
 func applyCommandHelper(resourcePaths []string, cluster bool, policyReport bool, mutateLogPath string,
 	variablesString string, valuesFile string, namespace string, policyPaths []string, stdin bool) (validateEngineResponses []*response.EngineResponse, rc *resultCounts, resources []*unstructured.Unstructured, skippedPolicies []SkippedPolicy, err error) {
 
+	store.SetMock(true)
 	kubernetesConfig := genericclioptions.NewConfigFlags(true)
 	fs := memfs.New()
 
@@ -286,7 +288,7 @@ func applyCommandHelper(resourcePaths []string, cluster bool, policyReport bool,
 				thisPolicyResourceValues[k] = v
 			}
 
-			if len(common.PolicyHasVariables(*policy)) > 0 && len(thisPolicyResourceValues) == 0 {
+			if len(common.PolicyHasVariables(*policy)) > 0 && len(thisPolicyResourceValues) == 0 && len(store.GetContext().Policies) == 0 {
 				return validateEngineResponses, rc, resources, skippedPolicies, sanitizederror.NewWithError(fmt.Sprintf("policy %s have variables. pass the values for the variables using set/values_file flag", policy.Name), err)
 			}
 

pkg/kyverno/common/common.go

@@ -16,11 +16,13 @@ import (
 	"github.com/go-git/go-billy/v5"
 	"github.com/go-logr/logr"
 	v1 "github.com/kyverno/kyverno/pkg/api/kyverno/v1"
+	pkgcommon "github.com/kyverno/kyverno/pkg/common"
 	client "github.com/kyverno/kyverno/pkg/dclient"
 	"github.com/kyverno/kyverno/pkg/engine"
 	"github.com/kyverno/kyverno/pkg/engine/context"
 	"github.com/kyverno/kyverno/pkg/engine/response"
 	sanitizederror "github.com/kyverno/kyverno/pkg/kyverno/sanitizedError"
+	"github.com/kyverno/kyverno/pkg/kyverno/store"
 	"github.com/kyverno/kyverno/pkg/policymutation"
 	"github.com/kyverno/kyverno/pkg/utils"
 	ut "github.com/kyverno/kyverno/pkg/utils"
@@ -32,15 +34,15 @@ import (
 )
 
 // GetPolicies - Extracting the policies from multiple YAML
-
-type Resource struct {
-	Name   string            `json:"name"`
-	Values map[string]string `json:"values"`
-}
-
 type Policy struct {
 	Name      string     `json:"name"`
 	Resources []Resource `json:"resources"`
+	Rules     []Rule     `json:"rules"`
+}
+
+type Rule struct {
+	Name   string            `json:"name"`
+	Values map[string]string `json:"values"`
 }
 
 type Values struct {
@@ -48,6 +50,11 @@ type Values struct {
 	NamespaceSelectors []NamespaceSelector `json:"namespaceSelector"`
 }
 
+type Resource struct {
+	Name   string            `json:"name"`
+	Values map[string]string `json:"values"`
+}
+
 type NamespaceSelector struct {
 	Name   string            `json:"name"`
 	Labels map[string]string `json:"labels"`
@@ -305,9 +312,9 @@ func RemoveDuplicateVariables(matches [][]string) string {
 	return variableStr
 }
 
-// GetVariable - get the variables from console/file
 func GetVariable(variablesString, valuesFile string, fs billy.Filesystem, isGit bool, policyresoucePath string) (map[string]string, map[string]map[string]Resource, map[string]map[string]string, error) {
-	valuesMap := make(map[string]map[string]Resource)
+	valuesMapResource := make(map[string]map[string]Resource)
+	valuesMapRule := make(map[string]map[string]Rule)
 	namespaceSelectorMap := make(map[string]map[string]string)
 	variables := make(map[string]string)
 	var yamlFile []byte
@@ -331,25 +338,33 @@ func GetVariable(variablesString, valuesFile string, fs billy.Filesystem, isGit
 		}
 
 		if err != nil {
-			return variables, valuesMap, namespaceSelectorMap, sanitizederror.NewWithError("unable to read yaml", err)
+			return variables, valuesMapResource, namespaceSelectorMap, sanitizederror.NewWithError("unable to read yaml", err)
 		}
 
 		valuesBytes, err := yaml.ToJSON(yamlFile)
 		if err != nil {
-			return variables, valuesMap, namespaceSelectorMap, sanitizederror.NewWithError("failed to convert json", err)
+			return variables, valuesMapResource, namespaceSelectorMap, sanitizederror.NewWithError("failed to convert json", err)
 		}
 
 		values := &Values{}
 		if err := json.Unmarshal(valuesBytes, values); err != nil {
-			return variables, valuesMap, namespaceSelectorMap, sanitizederror.NewWithError("failed to decode yaml", err)
+			return variables, valuesMapResource, namespaceSelectorMap, sanitizederror.NewWithError("failed to decode yaml", err)
 		}
 
 		for _, p := range values.Policies {
-			pmap := make(map[string]Resource)
+			resourceMap := make(map[string]Resource)
 			for _, r := range p.Resources {
-				pmap[r.Name] = r
+				resourceMap[r.Name] = r
+			}
+			valuesMapResource[p.Name] = resourceMap
+
+			if p.Rules != nil {
+				ruleMap := make(map[string]Rule)
+				for _, r := range p.Rules {
+					ruleMap[r.Name] = r
+				}
+				valuesMapRule[p.Name] = ruleMap
 			}
-			valuesMap[p.Name] = pmap
 		}
 
 		for _, n := range values.NamespaceSelectors {
@@ -357,7 +372,26 @@ func GetVariable(variablesString, valuesFile string, fs billy.Filesystem, isGit
 		}
 	}
 
-	return variables, valuesMap, namespaceSelectorMap, nil
+	storePolices := make([]store.Policy, 0)
+	for policyName, ruleMap := range valuesMapRule {
+		storeRules := make([]store.Rule, 0)
+		for _, rule := range ruleMap {
+			storeRules = append(storeRules, store.Rule{
+				Name:   rule.Name,
+				Values: rule.Values,
+			})
+		}
+		storePolices = append(storePolices, store.Policy{
+			Name:  policyName,
+			Rules: storeRules,
+		})
+	}
+
+	store.SetContext(store.Context{
+		Policies: storePolices,
+	})
+
+	return variables, valuesMapResource, namespaceSelectorMap, nil
 }
 
 // MutatePolices - function to apply mutation on policies
@@ -409,32 +443,7 @@ func ApplyPolicyOnResource(policy *v1.ClusterPolicy, resource *unstructured.Unst
 
 	ctx := context.NewContext()
 	for key, value := range variables {
-		var subString string
-		splitBySlash := strings.Split(key, "\"")
-		if len(splitBySlash) > 1 {
-			subString = splitBySlash[1]
-		}
-
-		startString := ""
-		endString := ""
-		lenOfVariableString := 0
-		addedSlashString := false
-		for _, k := range strings.Split(splitBySlash[0], ".") {
-			if k != "" {
-				startString += fmt.Sprintf(`{"%s":`, k)
-				endString += `}`
-				lenOfVariableString = lenOfVariableString + len(k) + 1
-				if lenOfVariableString >= len(splitBySlash[0]) && len(splitBySlash) > 1 && addedSlashString == false {
-					startString += fmt.Sprintf(`{"%s":`, subString)
-					endString += `}`
-					addedSlashString = true
-				}
-			}
-		}
-
-		midString := fmt.Sprintf(`"%s"`, value)
-		finalString := startString + midString + endString
-		var jsonData = []byte(finalString)
+		jsonData := pkgcommon.VariableToJSON(key, value)
 		ctx.AddJSON(jsonData)
 	}
 

pkg/kyverno/store/store.go

@@ -0,0 +1,56 @@
+package store
+
+var Mock bool
+var ContextVar Context
+
+func SetMock(mock bool) {
+	Mock = mock
+}
+
+func GetMock() bool {
+	return Mock
+}
+
+func SetContext(context Context) {
+	ContextVar = context
+}
+
+func GetContext() Context {
+	return ContextVar
+}
+
+func GetPolicyFromContext(policyName string) *Policy {
+	for _, policy := range ContextVar.Policies {
+		if policy.Name == policyName {
+			return &policy
+		}
+	}
+	return nil
+}
+
+func GetPolicyRuleFromContext(policyName string, ruleName string) *Rule {
+	for _, policy := range ContextVar.Policies {
+		if policy.Name == policyName {
+			for _, rule := range policy.Rules {
+				if rule.Name == ruleName {
+					return &rule
+				}
+			}
+		}
+	}
+	return nil
+}
+
+type Context struct {
+	Policies []Policy `json:"policies"`
+}
+
+type Policy struct {
+	Name  string `json:"name"`
+	Rules []Rule `json:"rules"`
+}
+
+type Rule struct {
+	Name   string            `json:"name"`
+	Values map[string]string `json:"values"`
+}