forked from kubevirt/kubevirt
/
decoders.go
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/
decoders.go
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/*
* This file is part of the KubeVirt project
*
* 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.
*
* Copyright 2017 Red Hat, Inc.
*
*/
package endpoints
import (
"bytes"
"encoding/json"
"errors"
"io"
"net/http"
"reflect"
"regexp"
"strconv"
"strings"
"github.com/asaskevich/govalidator"
"github.com/emicklei/go-restful"
"github.com/ghodss/yaml"
gokithttp "github.com/go-kit/kit/transport/http"
"golang.org/x/net/context"
"k8s.io/apimachinery/pkg/types"
"kubevirt.io/kubevirt/pkg/middleware"
"kubevirt.io/kubevirt/pkg/rest"
)
type PutObject struct {
Metadata Metadata
Payload interface{}
}
type PatchObject struct {
Metadata Metadata
Patch interface{}
PatchType types.PatchType
}
type Metadata struct {
Name string
Namespace string
Headers MetadataHeader
}
type MetadataHeader struct {
Pretty bool
Export bool
Exact bool
LabelSelector string
FieldSelector string
ResourceVersion string
TimeoutSeconds int64
}
const (
ReqKey string = "restful_req__"
RespKey string = "restful_resp__"
)
func GetRestfulRequest(ctx context.Context) *restful.Request {
return ctx.Value(ReqKey).(*restful.Request)
}
func GetRestfulResponse(ctx context.Context) *restful.Response {
return ctx.Value(RespKey).(*restful.Response)
}
func MakeGoRestfulWrapper(server *gokithttp.Server) restful.RouteFunction {
return func(request *restful.Request, response *restful.Response) {
requestFunc := func(ctx context.Context, _ *http.Request) context.Context {
ctx = context.WithValue(ctx, ReqKey, request)
ctx = context.WithValue(ctx, RespKey, response)
return ctx
}
gokithttp.ServerBefore(requestFunc)(server)
server.ServeHTTP(response.ResponseWriter, request.Request)
}
}
var nameIdentifierRegex = regexp.MustCompile("^[a-z0-9\\-]+$")
var namespaceIdentifierRegex = regexp.MustCompile("^[a-z0-9\\-]+$")
func nameDecodeRequestFunc(ctx context.Context, r *http.Request) (interface{}, error) {
rest := GetRestfulRequest(ctx)
name := rest.PathParameter("name")
if name == "" {
return nil, errors.New("Could not find a 'name' variable.")
}
if !nameIdentifierRegex.MatchString(name) {
return nil, errors.New("Variable 'name' is invalid.")
}
return name, nil
}
func queryExtractor(ctx context.Context, r *http.Request) (*MetadataHeader, error) {
rest := GetRestfulRequest(ctx)
meta := &MetadataHeader{}
if err := extractBool(rest.QueryParameter("pretty"), &(meta.Pretty)); err != nil {
return nil, err
}
if err := extractBool(rest.QueryParameter("export"), &(meta.Export)); err != nil {
return nil, err
}
if err := extractBool(rest.QueryParameter("exact"), &(meta.Exact)); err != nil {
return nil, err
}
meta.FieldSelector = rest.QueryParameter("fieldSelector")
meta.LabelSelector = rest.QueryParameter("labelSelector")
meta.ResourceVersion = rest.QueryParameter("resourceVersion")
if err := extractDuration(rest.QueryParameter("timeoutSeconds"), &(meta.TimeoutSeconds)); err != nil {
return nil, err
}
return meta, nil
}
func extractBool(header string, target *bool) error {
if header != "" {
f, err := strconv.ParseBool(header)
if err != nil {
return err
}
target = &f
}
return nil
}
func extractDuration(header string, target *int64) error {
if header != "" {
f, err := strconv.Atoi(header)
if err != nil {
return err
}
f64 := int64(f)
target = &f64
}
return nil
}
func namespaceDecodeRequestFunc(ctx context.Context, r *http.Request) (interface{}, error) {
rest := GetRestfulRequest(ctx)
namespace := rest.PathParameter("namespace")
if namespace == "" {
return nil, errors.New("Could not find a 'namespace' variable.")
}
if !namespaceIdentifierRegex.MatchString(namespace) {
return nil, errors.New("Variable 'namespace' is invalid.")
}
return namespace, nil
}
func NoopDecoder(_ context.Context, _ *http.Request) (interface{}, error) {
return nil, nil
}
func NotNamespacedDecodeRequestFunc(ctx context.Context, r *http.Request) (interface{}, error) {
headers, err := queryExtractor(ctx, r)
if err != nil {
return nil, err
}
return &Metadata{Headers: *headers}, nil
}
func NamespaceDecodeRequestFunc(ctx context.Context, r *http.Request) (interface{}, error) {
namespace, err := namespaceDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
headers, err := queryExtractor(ctx, r)
if err != nil {
return nil, err
}
return &Metadata{Namespace: namespace.(string), Headers: *headers}, nil
}
func NameNamespaceDecodeRequestFunc(ctx context.Context, r *http.Request) (interface{}, error) {
name, err := nameDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
namespace, err := namespaceDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
headers, err := queryExtractor(ctx, r)
if err != nil {
return nil, err
}
return &Metadata{Name: name.(string), Namespace: namespace.(string), Headers: *headers}, nil
}
func NewJsonDecodeRequestFunc(payloadTypePtr interface{}) gokithttp.DecodeRequestFunc {
payloadType := reflect.TypeOf(payloadTypePtr).Elem()
return func(_ context.Context, r *http.Request) (interface{}, error) {
obj := reflect.New(payloadType).Interface()
if err := json.NewDecoder(r.Body).Decode(obj); err != nil {
return nil, err
}
if _, err := govalidator.ValidateStruct(obj); err != nil {
return nil, err
}
return obj, nil
}
}
func JsonPatchDecodeRequestFunc(_ context.Context, r *http.Request) (interface{}, error) {
var patch interface{}
err := json.NewDecoder(r.Body).Decode(&patch)
if err != nil {
return nil, err
}
return patch, nil
}
func NewYamlDecodeRequestFunc(payloadTypePtr interface{}) gokithttp.DecodeRequestFunc {
payloadType := reflect.TypeOf(payloadTypePtr).Elem()
return func(_ context.Context, r *http.Request) (interface{}, error) {
obj := reflect.New(payloadType).Interface()
var b []byte
buf := bytes.NewBuffer(b)
_, err := buf.ReadFrom(r.Body)
if err != nil {
return nil, err
}
if err := yaml.Unmarshal(buf.Bytes(), obj); err != nil {
return nil, err
}
if _, err := govalidator.ValidateStruct(obj); err != nil {
return nil, err
}
return obj, nil
}
}
func NewJsonDeleteDecodeRequestFunc(payloadTypePtr interface{}) gokithttp.DecodeRequestFunc {
jsonDecodeRequestFunc := NewMimeTypeAwareDecodeRequestFunc(
NewJsonDecodeRequestFunc(payloadTypePtr),
map[string]gokithttp.DecodeRequestFunc{
rest.MIME_JSON: NewJsonDecodeRequestFunc(payloadTypePtr),
rest.MIME_YAML: NewYamlDecodeRequestFunc(payloadTypePtr),
},
)
return func(ctx context.Context, r *http.Request) (interface{}, error) {
metadata, err := NameNamespaceDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
var payload interface{}
if r.Body != nil {
payload, err = jsonDecodeRequestFunc(ctx, r)
// payload is optional, so continue if we get EOF
if err != nil && err != io.EOF {
return nil, err
}
}
return &PutObject{Metadata: *metadata.(*Metadata), Payload: payload}, nil
}
}
func NewJsonPostDecodeRequestFunc(payloadTypePtr interface{}) gokithttp.DecodeRequestFunc {
jsonDecodeRequestFunc := NewMimeTypeAwareDecodeRequestFunc(
NewJsonDecodeRequestFunc(payloadTypePtr),
map[string]gokithttp.DecodeRequestFunc{
rest.MIME_JSON: NewJsonDecodeRequestFunc(payloadTypePtr),
rest.MIME_YAML: NewYamlDecodeRequestFunc(payloadTypePtr),
},
)
return func(ctx context.Context, r *http.Request) (interface{}, error) {
metadata, err := NamespaceDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
payload, err := jsonDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
return &PutObject{Metadata: *metadata.(*Metadata), Payload: payload}, nil
}
}
func NewJsonPutDecodeRequestFunc(payloadTypePtr interface{}) gokithttp.DecodeRequestFunc {
jsonDecodeRequestFunc := NewMimeTypeAwareDecodeRequestFunc(
NewJsonDecodeRequestFunc(payloadTypePtr),
map[string]gokithttp.DecodeRequestFunc{
rest.MIME_JSON: NewJsonDecodeRequestFunc(payloadTypePtr),
rest.MIME_YAML: NewYamlDecodeRequestFunc(payloadTypePtr),
},
)
return func(ctx context.Context, r *http.Request) (interface{}, error) {
metadata, err := NameNamespaceDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
payload, err := jsonDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
return &PutObject{Metadata: *metadata.(*Metadata), Payload: payload}, nil
}
}
func NewJsonPatchDecodeRequestFunc() gokithttp.DecodeRequestFunc {
jsonDecodeRequestFunc := NewMimeTypeAwareDecodeRequestFunc(
nil,
map[string]gokithttp.DecodeRequestFunc{
string(types.JSONPatchType): JsonPatchDecodeRequestFunc,
string(types.MergePatchType): JsonPatchDecodeRequestFunc,
},
)
return func(ctx context.Context, r *http.Request) (interface{}, error) {
metadata, err := NameNamespaceDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
payload, err := jsonDecodeRequestFunc(ctx, r)
if err != nil {
return nil, err
}
patchType := types.PatchType(r.Header.Get("Content-Type"))
return &PatchObject{Metadata: *metadata.(*Metadata), Patch: payload, PatchType: patchType}, nil
}
}
func NewMimeTypeAwareDecodeRequestFunc(defaultDecoder gokithttp.DecodeRequestFunc, decoderMapping map[string]gokithttp.DecodeRequestFunc) gokithttp.DecodeRequestFunc {
return func(ctx context.Context, r *http.Request) (interface{}, error) {
requestContext := GetRestfulRequest(ctx)
contentType := strings.TrimSpace(requestContext.HeaderParameter("Content-Type"))
// Use default encoder in case no Content-Type is specified
decoder := defaultDecoder
if len(contentType) > 0 {
// Content-Type is given, check if we have a decoder and fail if we don't
decoder = decoderMapping[contentType]
if decoder == nil {
return nil, middleware.NewUnsupportedMediaType(contentType)
}
}
return decoder(ctx, r)
}
}