add webapp docs and fix related issues

.github/ISSUE_TEMPLATE/bug.yaml

@@ -14,7 +14,7 @@ body:
       description: >-
         What version of the Kyverno JSON are you running?
       options:
-        - 1.0.0
+        - 0.1.0
     validations:
       required: true
   - type: textarea

charts/kyverno-json/Chart.yaml

@@ -13,4 +13,5 @@ sources:
 maintainers:
   - name: Nirmata
     url: https://kyverno.io/
+    email: cncf-kyverno-maintainers@lists.cncf.io
 kubeVersion: ">=1.16.0-0"

charts/kyverno-json/README.md

@@ -85,7 +85,7 @@ Kubernetes: `>=1.16.0-0`
 
 | Name | Email | Url |
 | ---- | ------ | --- |
-| Nirmata |  | <https://kyverno.io/> |
+| Nirmata | <cncf-kyverno-maintainers@lists.cncf.io> | <https://kyverno.io/> |
 
 ----------------------------------------------
 Autogenerated from chart metadata using [helm-docs v1.11.0](https://github.com/norwoodj/helm-docs/releases/v1.11.0)

pkg/commands/scan/command.go

@@ -15,9 +15,9 @@ func Command() *cobra.Command {
 		RunE:         command.run,
 	}
 	cmd.Flags().StringVar(&command.payload, "payload", "", "Path to payload (json or yaml file)")
-	cmd.Flags().StringSliceVar(&command.preprocessors, "pre-process", nil, "JmesPath expression used to pre process payload")
+	cmd.Flags().StringSliceVar(&command.preprocessors, "pre-process", nil, "JMESPath expression used to pre process payload")
 	cmd.Flags().StringSliceVar(&command.policies, "policy", nil, "Path to kyverno-json policies")
 	cmd.Flags().StringSliceVar(&command.selectors, "labels", nil, "Labels selectors for policies")
-	cmd.Flags().StringVar(&command.identifier, "identifier", "", "JmesPath expression used to identify a resource")
+	cmd.Flags().StringVar(&command.identifier, "identifier", "", "JMESPath expression used to identify a resource")
 	return cmd
 }

pkg/commands/serve/options.go

@@ -39,7 +39,7 @@ type clusterFlags struct {
 }
 
 func (c *options) Run(_ *cobra.Command, _ []string) error {
-	// initialise gin framework
+	// initialize gin framework
 	gin.SetMode(c.ginFlags.mode)
 	tonic.SetBindHook(tonic.DefaultBindingHookMaxBodyBytes(int64(c.ginFlags.maxBodySize)))
 	// create router

pkg/json-engine/engine.go

@@ -63,9 +63,9 @@ func New() engine.Engine[JsonEngineRequest, JsonEngineResponse] {
 			}
 			errs, err := assert.MatchAssert(ctx, nil, r.rule.Assert, r.value, r.bindings)
 			if err != nil {
-				response.Failure = err
-			} else if err := multierr.Combine(errs...); err != nil {
 				response.Error = err
+			} else if err := multierr.Combine(errs...); err != nil {
+				response.Failure = err
 			}
 			return response
 		}).

pkg/server/linux.go

@@ -5,6 +5,7 @@ package server
 import (
 	"context"
 	"fmt"
+	"log"
 	"net/http"
 	"time"
 )
@@ -21,5 +22,6 @@ func Run(_ context.Context, s Server, host string, port int) Shutdown {
 			panic(err)
 		}
 	}()
+	log.Default().Printf("listening to requests on %s:%d", host, port)
 	return srv.Shutdown
 }

pkg/server/scan/handler.go

@@ -56,6 +56,10 @@ func newHandler(policyProvider PolicyProvider) (gin.HandlerFunc, error) {
 			Resources: resources,
 			Policies:  pols,
 		})
-		return makeResponse(results...), nil
+		resp, _ := makeResponse(results...)
+		// if status != http.StatusOK {
+		// 	// TODO: handle HTTP status codes
+		// }
+		return resp, nil
 	}, http.StatusOK), nil
 }

pkg/server/scan/response.go

@@ -1,26 +1,69 @@
 package scan
 
 import (
-	"github.com/kyverno/kyverno-json/pkg/apis/v1alpha1"
+	"net/http"
+
 	jsonengine "github.com/kyverno/kyverno-json/pkg/json-engine"
 )
 
 type Response struct {
 	Results []Result `json:"results"`
 }
 
+type PolicyResult string
+
 type Result struct {
-	Policy   *v1alpha1.ValidatingPolicy `json:"policy"`
-	Rule     v1alpha1.ValidatingRule    `json:"rule"`
-	Resource interface{}                `json:"resource"`
-	Failure  error                      `json:"failure"`
-	Error    error                      `json:"error"`
+	PolicyName string       `json:"policy"`
+	RuleName   string       `json:"rule"`
+	Result     PolicyResult `json:"status"`
+	Message    string       `json:"message"`
 }
 
-func makeResponse(responses ...jsonengine.JsonEngineResponse) *Response {
+// Status specifies state of a policy result
+const (
+	StatusPass  PolicyResult = "pass"
+	StatusFail  PolicyResult = "fail"
+	StatusWarn  PolicyResult = "warn"
+	StatusError PolicyResult = "error"
+	StatusSkip  PolicyResult = "skip"
+)
+
+func makeResponse(responses ...jsonengine.JsonEngineResponse) (*Response, int) {
 	var response Response
-	for _, result := range responses {
-		response.Results = append(response.Results, Result(result))
+	failCount := 0
+	errorCount := 0
+	for _, r := range responses {
+		status, msg := getStatusAndMessage(r)
+		if status == StatusError {
+			errorCount++
+		} else if status == StatusFail {
+			failCount++
+		}
+
+		response.Results = append(response.Results, Result{
+			PolicyName: r.Policy.Name,
+			RuleName:   r.Rule.Name,
+			Result:     status,
+			Message:    msg,
+		})
+	}
+
+	httpStatus := http.StatusOK
+	if failCount > 0 {
+		httpStatus = http.StatusForbidden
+	} else if errorCount > 0 {
+		httpStatus = http.StatusNotAcceptable
+	}
+
+	return &response, httpStatus
+}
+
+func getStatusAndMessage(r jsonengine.JsonEngineResponse) (PolicyResult, string) {
+	if r.Error != nil {
+		return StatusError, r.Error.Error()
+	}
+	if r.Failure != nil {
+		return StatusFail, r.Failure.Error()
 	}
-	return &response
+	return StatusPass, ""
 }

pkg/server/scan/routes.go

@@ -1,6 +1,8 @@
 package scan
 
 import (
+	"log"
+
 	"github.com/gin-gonic/gin"
 )
 
@@ -10,5 +12,6 @@ func AddRoutes(group *gin.RouterGroup, policyProvider PolicyProvider) error {
 		return err
 	}
 	group.POST("/scan", handler)
+	log.Default().Printf("configured route %s/%s", group.BasePath(), "scan")
 	return nil
 }

test/commands/scan/dockerfile/out.txt

@@ -2,5 +2,5 @@ Loading policies ...
 Loading payload ...
 Pre processing ...
 Running ( evaluating 1 resource against 1 policy ) ...
-- check-dockerfile / deny-external-calls / (unknown) FAILED: HTTP calls are not allowed: all[0].check.~.(Stages[].Commands[].Args[].Value)[0].(contains(@, 'https://') || contains(@, 'http://')): Invalid value: true: Expected value: false; wget is not allowed: all[3].check.~.(Stages[].Commands[].CmdLine[])[0].(contains(@, 'wget')): Invalid value: true: Expected value: false
+- check-dockerfile / deny-external-calls / (unknown) ERROR: HTTP calls are not allowed: all[0].check.~.(Stages[].Commands[].Args[].Value)[0].(contains(@, 'https://') || contains(@, 'http://')): Invalid value: true: Expected value: false; wget is not allowed: all[3].check.~.(Stages[].Commands[].CmdLine[])[0].(contains(@, 'wget')): Invalid value: true: Expected value: false
 Done

test/commands/scan/payload-yaml/out.txt

@@ -2,5 +2,5 @@ Loading policies ...
 Loading payload ...
 Pre processing ...
 Running ( evaluating 1 resource against 1 policy ) ...
-- required-s3-tags / require-team-tag / aws_s3_bucket.example FAILED: Bucket `example` (aws_s3_bucket.example) does not have the required tags {"Team":"Kyverno"}: all[0].check.values.tags: Invalid value: map[string]interface {}{"Environment":"Dev", "Name":"My bucket"}: Expected value: map[string]interface {}{"Team":"Kyverno"}
+- required-s3-tags / require-team-tag / aws_s3_bucket.example ERROR: Bucket `example` (aws_s3_bucket.example) does not have the required tags {"Team":"Kyverno"}: all[0].check.values.tags: Invalid value: map[string]interface {}{"Environment":"Dev", "Name":"My bucket"}: Expected value: map[string]interface {}{"Team":"Kyverno"}
 Done

test/commands/scan/pod-no-latest/out.txt

@@ -2,5 +2,5 @@ Loading policies ...
 Loading payload ...
 Pre processing ...
 Running ( evaluating 1 resource against 1 policy ) ...
-- test / pod-no-latest / webserver FAILED: [all[0].check.spec.~foo.containers->foos[0].(at($foos, $foo).image)->foo.(ends_with($foo, $tag)): Invalid value: true: Expected value: false, all[0].check.spec.~foo.containers->foos[1].(at($foos, $foo).image)->foo.(ends_with($foo, $tag)): Invalid value: true: Expected value: false, all[0].check.spec.~foo.containers->foos[2].(at($foos, $foo).image)->foo.(ends_with($foo, $tag)): Invalid value: true: Expected value: false]; [all[1].check.spec.~.containers->foo[0].image.(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[1].check.spec.~.containers->foo[1].image.(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[1].check.spec.~.containers->foo[2].image.(ends_with(@, ':latest')): Invalid value: true: Expected value: false]; [all[2].check.~index.(spec.containers[*].image)->images[0].(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[2].check.~index.(spec.containers[*].image)->images[1].(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[2].check.~index.(spec.containers[*].image)->images[2].(ends_with(@, ':latest')): Invalid value: true: Expected value: false]
+- test / pod-no-latest / webserver ERROR: [all[0].check.spec.~foo.containers->foos[0].(at($foos, $foo).image)->foo.(ends_with($foo, $tag)): Invalid value: true: Expected value: false, all[0].check.spec.~foo.containers->foos[1].(at($foos, $foo).image)->foo.(ends_with($foo, $tag)): Invalid value: true: Expected value: false, all[0].check.spec.~foo.containers->foos[2].(at($foos, $foo).image)->foo.(ends_with($foo, $tag)): Invalid value: true: Expected value: false]; [all[1].check.spec.~.containers->foo[0].image.(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[1].check.spec.~.containers->foo[1].image.(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[1].check.spec.~.containers->foo[2].image.(ends_with(@, ':latest')): Invalid value: true: Expected value: false]; [all[2].check.~index.(spec.containers[*].image)->images[0].(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[2].check.~index.(spec.containers[*].image)->images[1].(ends_with(@, ':latest')): Invalid value: true: Expected value: false, all[2].check.~index.(spec.containers[*].image)->images[2].(ends_with(@, ':latest')): Invalid value: true: Expected value: false]
 Done

test/commands/scan/tf-plan/out.txt

@@ -2,5 +2,5 @@ Loading policies ...
 Loading payload ...
 Pre processing ...
 Running ( evaluating 1 resource against 1 policy ) ...
-- required-s3-tags / require-team-tag / aws_s3_bucket.example FAILED: Bucket `example` (aws_s3_bucket.example) does not have the required tags {"Team":"Kyverno"}: all[0].check.values.tags: Invalid value: map[string]interface {}{"Environment":"Dev", "Name":"My bucket"}: Expected value: map[string]interface {}{"Team":"Kyverno"}
+- required-s3-tags / require-team-tag / aws_s3_bucket.example ERROR: Bucket `example` (aws_s3_bucket.example) does not have the required tags {"Team":"Kyverno"}: all[0].check.values.tags: Invalid value: map[string]interface {}{"Environment":"Dev", "Name":"My bucket"}: Expected value: map[string]interface {}{"Team":"Kyverno"}
 Done

test/commands/scan/tf-s3/out.txt

@@ -2,5 +2,5 @@ Loading policies ...
 Loading payload ...
 Pre processing ...
 Running ( evaluating 1 resource against 1 policy ) ...
-- s3 / check-tags / (unknown) FAILED: all[0].check.planned_values.root_module.~.resources[0].values.(keys(tags_all)).(contains(@, 'Team')): Invalid value: false: Expected value: true
+- s3 / check-tags / (unknown) ERROR: all[0].check.planned_values.root_module.~.resources[0].values.(keys(tags_all)).(contains(@, 'Team')): Invalid value: false: Expected value: true
 Done

test/commands/scan/wildcard/out.txt

@@ -2,5 +2,5 @@ Loading policies ...
 Loading payload ...
 Pre processing ...
 Running ( evaluating 1 resource against 1 policy ) ...
-- required-s3-tags / require-team-tag / bucket1 FAILED: all[0].check.tags.(wildcard('?*', Team)): Invalid value: true: Expected value: false
+- required-s3-tags / require-team-tag / bucket1 ERROR: all[0].check.tags.(wildcard('?*', Team)): Invalid value: true: Expected value: false
 Done

website/docs/cli/commands/kyverno-json_scan.md

@@ -14,11 +14,11 @@ kyverno-json scan [flags]
 
 ```
   -h, --help                  help for scan
-      --identifier string     JmesPath expression used to identify a resource
+      --identifier string     JMESPath expression used to identify a resource
       --labels strings        Labels selectors for policies
       --payload string        Path to payload (json or yaml file)
       --policy strings        Path to kyverno-json policies
-      --pre-process strings   JmesPath expression used to pre process payload
+      --pre-process strings   JMESPath expression used to pre process payload
 ```
 
 ### SEE ALSO

website/docs/cli/index.md

@@ -1,9 +1,92 @@
-# Usage
+# Overview
 
-tbd...
+The `kyverno-json` Command Line Interface (CLI) can be used to:
 
-## Pre-processing
+* scan JSON or YAML files 
+* launch a web application with a REST API
+* launch a playground 
 
-Additionally, you can provide preprocessing queries in [jmespath](https://jmespath.site) format to pre-process the input payload before evaluating *resources* against policies.
+Here is an example of scanning an Terraform plan that creates an S3 bucket:
 
-This is necessary if the input payload is not what you want to directly analyse.
+```sh
+./kyverno-json scan --policy test/commands/scan/tf-s3/policy.yaml --payload test/commands/scan/tf-s3/payload.json
+```
+
+The output looks like:
+
+```sh
+Loading policies ...
+Loading payload ...
+Pre processing ...
+Running ( evaluating 1 resource against 1 policy ) ...
+- s3 / check-tags / (unknown) FAILED: all[0].check.planned_values.root_module.~.resources[0].values.(keys(tags_all)).(contains(@, 'Team')): Invalid value: false: Expected value: true
+Done
+```
+
+## Installation
+
+See [Install](../install.md) for the available options to install the CLI.
+
+## Pre-processing payloads
+
+You can provide preprocessing queries in [jmespath](https://jmespath.site) format to pre-process the input payload before evaluating *resources* against policies.
+
+This is necessary if the input payload is not what you want to directly analyze.
+
+For example, here is a partial JSON which was produced by converting a Terraform plan that creates an EC2 instance:
+
+[kyverno/kyverno-json/main/test/commands/scan/tf-ec2/payload.json](https://github.com/kyverno/kyverno-json/blob/main/test/commands/scan/tf-ec2/payload.json)
+
+```json
+{
+  "format_version": "1.2",
+  "terraform_version": "1.5.7",
+  "planned_values": {
+    "root_module": {
+      "resources": [
+        {
+          "address": "aws_instance.app_server",
+          "mode": "managed",
+          "type": "aws_instance",
+          "name": "app_server",
+          "provider_name": "registry.terraform.io/hashicorp/aws",
+          "schema_version": 1,
+          "values": {
+            "ami": "ami-830c94e3",
+            "credit_specification": [],
+            "get_password_data": false,
+            "hibernation": null,
+            "instance_type": "t2.micro",
+            "launch_template": [],
+            "source_dest_check": true,
+            "tags": {
+              "Name": "ExampleAppServerInstance"
+            },
+            "tags_all": {
+              "Name": "ExampleAppServerInstance"
+            },
+            "timeouts": null,
+            "user_data_replace_on_change": false,
+            "volume_tags": null
+          },
+
+          ...
+
+```
+
+To directly scan the `resources` element use `--pre-process planned_values.root_module.resources` as follows:
+
+```sh
+./kyverno-json scan --policy test/commands/scan/tf-ec2/policy.yaml --payload test/commands/scan/tf-ec2/payload.json --pre-process planned_values.root_module.resources
+```
+
+This command will produce the output:
+
+```sh
+Loading policies ...
+Loading payload ...
+Pre processing ...
+Running ( evaluating 1 resource against 1 policy ) ...
+- required-ec2-tags / require-team-tag / (unknown) PASSED
+Done
+```

website/docs/install.md

@@ -2,15 +2,15 @@
 
 You can install the pre-compiled binary (in several ways), or compile from source.
 
-## Install using `go install`
+## Using `go install`
 
 You can install with `go install` with:
 
 ```bash
 go install github.com/kyverno/kyverno-json@latest
 ```
 
-## Manually
+## Download binary
 
 Download the pre-compiled binaries from the [releases page](https://github.com/kyverno/kyverno-json/releases) and copy them to the desired location.
 

website/docs/intro.md

@@ -1,11 +1,11 @@
 # Introduction
 
-`kyverno-json` allows any data in JSON (or YAML) format data to be validated with Kyverno policies. For example, you can now use Kyverno policies to validate:
+`kyverno-json` extends Kyverno policies to perform simple and efficient validation of data in JSON or YAML format. With `kyverno-json`, you can now use Kyverno policies to validate:
 
 - Terraform files
 - Dockerfiles
 - Cloud configurations
-- Service authorization requests
+- Authorization requests
 
 Simply convert your runtime or configuration data to JSON, and use Kyverno to audit or enforce policies for security and best practices compliance.
 
@@ -14,4 +14,3 @@ Simply convert your runtime or configuration data to JSON, and use Kyverno to au
 1. [A Command Line Interface (CLI)](./cli/index.md)
 2. [A web application with a REST API](./webapp/index.md)
 3. [A Golang library](./go-library/index.md)
-

website/docs/policies/policies.md

@@ -2,7 +2,7 @@
 
 Kyverno policies are [Kubernetes resources](https://kubernetes.io/docs/concepts/extend-kubernetes/api-extension/custom-resources/) and can be easily managed via Kubernetes APIs, GitOps workflows, and other existing tools.
 
-However, policies that apply to JSON payload have a few differences from Kyverno policies that are applied to Kubernetes resources at admission controls.
+Policies that apply to JSON payload have a few differences from Kyverno policies that are applied to Kubernetes resources at admission controls.
 
 ## Resource Scope
 
@@ -65,7 +65,7 @@ A policy rule can contain `context` entries are made available to the rule via b
 
 ```yaml
 apiVersion: json.kyverno.io/v1alpha1
-kind: Policy
+kind: ValidatingPolicy
 metadata:
   name: required-s3-tags
 spec: