try to validate

go.mod

@@ -2,4 +2,7 @@ module github.com/yannh/kubeconform
 
 go 1.14
 
-require gopkg.in/yaml.v2 v2.3.0
+require (
+	github.com/xeipuuv/gojsonschema v1.2.0
+	gopkg.in/yaml.v2 v2.3.0
+)

go.sum

@@ -1,3 +1,13 @@
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
+github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f h1:J9EGpcZtP0E/raorCMxlFGSTBrsSlaDGf3jU/qvAE2c=
+github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
+github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 h1:EzJWgHovont7NscjpAxXsDA8S8BMYve8Y5+7cuRE7R0=
+github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
+github.com/xeipuuv/gojsonschema v1.2.0 h1:LhYJRs+L4fBtjZUfuSZIKGeVu0QRy8e5Xi7D17UxZ74=
+github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v2 v2.3.0 h1:clyUAQHOM3G0M3f5vQj7LuJrETvjVot3Z5el9nffUtU=
 gopkg.in/yaml.v2 v2.3.0/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

main.go

@@ -1,15 +1,19 @@
 package main
 
 import (
+	"io/ioutil"
 	"log"
 	"os"
 
 	"github.com/yannh/kubeconform/pkg/registry"
 	"github.com/yannh/kubeconform/pkg/resource"
+	"github.com/yannh/kubeconform/pkg/validator"
 )
 
 func realMain() int {
+	const k8sVersion = "1.18.0"
 	filename := "fixtures/valid_1.yaml"
+
 	f, err := os.Open(filename)
 	if err != nil {
 		log.Fatalf("failed opening %s", filename)
@@ -17,21 +21,34 @@ func realMain() int {
 	}
 	defer f.Close()
 
-	res, err := resource.Read(f)
+	rawResource, err := ioutil.ReadAll(f)
+	if err != nil {
+		log.Printf("failed reading file %s", filename)
+		return 1
+	}
+
+	sig, err := resource.SignatureFromBytes(rawResource)
 	if err != nil {
 		log.Printf("failed parsing %s", filename)
 		return 1
 	}
 
 	r := registry.NewKubernetesRegistry()
-	schema, err := r.DownloadSchema(res.Kind, res.Version, "1.18.0")
+	schema, err := r.DownloadSchema(sig.Kind, sig.Version, k8sVersion)
 
 	if err != nil {
-		log.Printf("error downloading Schema: %s")
+		log.Printf("error downloading Schema: %s", err)
 		return 1
 	}
 
-	log.Printf("downloaded schema successfully: %s", schema)
+	err = validator.Validate(rawResource, schema)
+	if err != nil {
+		log.Printf("failed validating: %s", err)
+		return 1
+	}
+
+
+	log.Printf("resource is valid!: %s", schema)
 
 	return 0
 }

pkg/registry/registry.go

@@ -50,22 +50,22 @@ func (r KubernetesRegistry) schemaURL(resourceKind, resourceAPIVersion, k8sVersi
 	return fmt.Sprintf("%s/%s-standalone%s/%s%s.json", r.baseURL, normalisedVersion, strictSuffix, strings.ToLower(resourceKind), kindSuffix)
 }
 
-func (r KubernetesRegistry) DownloadSchema(resourceKind, resourceAPIVersion, k8sVersion string) (string, error) {
+func (r KubernetesRegistry) DownloadSchema(resourceKind, resourceAPIVersion, k8sVersion string) ([]byte, error) {
 	url := r.schemaURL(resourceKind, resourceAPIVersion, k8sVersion)
 
 	resp, err := http.Get(url)
 	if err != nil {
-		return "", fmt.Errorf("failed downloading schema at %s: %s", url, err)
+		return []byte{}, fmt.Errorf("failed downloading schema at %s: %s", url, err)
 	}
 	defer resp.Body.Close()
 
 	body, err :=  ioutil.ReadAll(resp.Body)
 	if err != nil {
-		return "", fmt.Errorf("failed downloading schema at %s: %s", url, err)
+		return []byte{}, fmt.Errorf("failed downloading schema at %s: %s", url, err)
 	}
 
 	fmt.Printf("downloaded %s\n", url)
 
-	return string(body), nil
+	return body, nil
 }
 

pkg/resource/main.go

@@ -1,22 +1,15 @@
 package resource
 
 import (
-	"io"
-	"io/ioutil"
 	yaml "gopkg.in/yaml.v2"
 )
 
-type Resource struct {
+type Signature struct {
 	Kind, Version, Namespace string
 }
 
 // TODO: Support multi-resources yaml files
-func Read(r io.Reader) (Resource, error) {
-	s, err := ioutil.ReadAll(r)
-	if err != nil {
-		return Resource{}, err
-	}
-
+func SignatureFromBytes(s []byte) (Signature, error) {
 	resource := struct {
 		APIVersion string `yaml:"apiVersion"`
 		Kind       string `yaml:"kind"`
@@ -24,7 +17,8 @@ func Read(r io.Reader) (Resource, error) {
 			Namespace string `yaml:"Namespace"`
 		} `yaml:"Metadata"`
 	}{}
-	err = yaml.Unmarshal(s, &resource)
+	err := yaml.Unmarshal(s, &resource)
+
+	return Signature{Kind: resource.Kind, Version: resource.APIVersion, Namespace: resource.Metadata.Namespace}, err
+}
 
-	return Resource{Kind: resource.Kind, Version: resource.APIVersion, Namespace: resource.Metadata.Namespace}, err
-}

pkg/validator/main.go

@@ -0,0 +1,42 @@
+package validator
+
+import (
+	"fmt"
+	"github.com/xeipuuv/gojsonschema"
+)
+
+// ValidFormat is a type for quickly forcing
+// new formats on the gojsonschema loader
+type ValidFormat struct{}
+func (f ValidFormat) IsFormat(input interface{}) bool {
+	return true
+}
+
+func init () {
+	gojsonschema.FormatCheckers.Add("int64", ValidFormat{})
+	gojsonschema.FormatCheckers.Add("byte", ValidFormat{})
+	gojsonschema.FormatCheckers.Add("int32", ValidFormat{})
+	gojsonschema.FormatCheckers.Add("int-or-string", ValidFormat{})
+}
+
+func Validate(resource interface{}, rawSchema []byte) error {
+	schemaLoader := gojsonschema.NewBytesLoader(rawSchema)
+	schema, err := gojsonschema.NewSchema(schemaLoader)
+	if err != nil {
+		return err
+	}
+
+	documentLoader := gojsonschema.NewGoLoader(resource)
+	results, err := schema.Validate(documentLoader)
+	if err != nil {
+		// This error can only happen if the Object to validate is poorly formed. There's no hope of saving this one
+		return  fmt.Errorf("problem validating schema. Check JSON formatting: %s", err)
+	}
+
+	if !results.Valid() {
+		return fmt.Errorf("resource does not conform to schema")
+	}
+
+	return nil
+}
+