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Merge pull request #117571 from seans3/agg-discovery-fix

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Fixes bug when extra params added to discovery content-type

Kubernetes-commit: c5c2806e233b9c5ff49ac4ad0c6d734b530771de
This commit is contained in:
Kubernetes Publisher 2023-04-26 12:04:15 -07:00
commit 68394bf465
2 changed files with 107 additions and 29 deletions
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64
discovery/discovery_client.go
View File

@ -20,6 +20,7 @@ import (
"context"
"encoding/json"
"fmt"
"mime"
"net/http"
"net/url"
"sort"
@ -58,8 +59,9 @@ const (
defaultBurst = 300
AcceptV1 = runtime.ContentTypeJSON
// Aggregated discovery content-type (currently v2beta1). NOTE: Currently, we are assuming the order
// for "g", "v", and "as" from the server. We can only compare this string if we can make that assumption.
// Aggregated discovery content-type (v2beta1). NOTE: content-type parameters
// MUST be ordered (g, v, as) for server in "Accept" header (BUT we are resilient
// to ordering when comparing returned values in "Content-Type" header).
AcceptV2Beta1 = runtime.ContentTypeJSON + ";" + "g=apidiscovery.k8s.io;v=v2beta1;as=APIGroupDiscoveryList"
// Prioritize aggregated discovery by placing first in the order of discovery accept types.
acceptDiscoveryFormats = AcceptV2Beta1 + "," + AcceptV1
@ -259,8 +261,16 @@ func (d *DiscoveryClient) downloadLegacy() (
var resourcesByGV map[schema.GroupVersion]*metav1.APIResourceList
// Switch on content-type server responded with: aggregated or unaggregated.
switch responseContentType {
case AcceptV1:
switch {
case isV2Beta1ContentType(responseContentType):
var aggregatedDiscovery apidiscovery.APIGroupDiscoveryList
err = json.Unmarshal(body, &aggregatedDiscovery)
if err != nil {
return nil, nil, nil, err
}
apiGroupList, resourcesByGV, failedGVs = SplitGroupsAndResources(aggregatedDiscovery)
default:
// Default is unaggregated discovery v1.
var v metav1.APIVersions
err = json.Unmarshal(body, &v)
if err != nil {
@ -271,15 +281,6 @@ func (d *DiscoveryClient) downloadLegacy() (
apiGroup = apiVersionsToAPIGroup(&v)
}
apiGroupList.Groups = []metav1.APIGroup{apiGroup}
case AcceptV2Beta1:
var aggregatedDiscovery apidiscovery.APIGroupDiscoveryList
err = json.Unmarshal(body, &aggregatedDiscovery)
if err != nil {
return nil, nil, nil, err
}
apiGroupList, resourcesByGV, failedGVs = SplitGroupsAndResources(aggregatedDiscovery)
default:
return nil, nil, nil, fmt.Errorf("Unknown discovery response content-type: %s", responseContentType)
}
return apiGroupList, resourcesByGV, failedGVs, nil
@ -313,13 +314,8 @@ func (d *DiscoveryClient) downloadAPIs() (
failedGVs := map[schema.GroupVersion]error{}
var resourcesByGV map[schema.GroupVersion]*metav1.APIResourceList
// Switch on content-type server responded with: aggregated or unaggregated.
switch responseContentType {
case AcceptV1:
err = json.Unmarshal(body, apiGroupList)
if err != nil {
return nil, nil, nil, err
}
case AcceptV2Beta1:
switch {
case isV2Beta1ContentType(responseContentType):
var aggregatedDiscovery apidiscovery.APIGroupDiscoveryList
err = json.Unmarshal(body, &aggregatedDiscovery)
if err != nil {
@ -327,12 +323,38 @@ func (d *DiscoveryClient) downloadAPIs() (
}
apiGroupList, resourcesByGV, failedGVs = SplitGroupsAndResources(aggregatedDiscovery)
default:
return nil, nil, nil, fmt.Errorf("Unknown discovery response content-type: %s", responseContentType)
// Default is unaggregated discovery v1.
err = json.Unmarshal(body, apiGroupList)
if err != nil {
return nil, nil, nil, err
}
}
return apiGroupList, resourcesByGV, failedGVs, nil
}
// isV2Beta1ContentType checks of the content-type string is both
// "application/json" and contains the v2beta1 content-type params.
// NOTE: This function is resilient to the ordering of the
// content-type parameters, as well as parameters added by
// intermediaries such as proxies or gateways. Examples:
//
// "application/json; g=apidiscovery.k8s.io;v=v2beta1;as=APIGroupDiscoveryList" = true
// "application/json; as=APIGroupDiscoveryList;v=v2beta1;g=apidiscovery.k8s.io" = true
// "application/json; as=APIGroupDiscoveryList;v=v2beta1;g=apidiscovery.k8s.io;charset=utf-8" = true
// "application/json" = false
// "application/json; charset=UTF-8" = false
func isV2Beta1ContentType(contentType string) bool {
base, params, err := mime.ParseMediaType(contentType)
if err != nil {
return false
}
return runtime.ContentTypeJSON == base &&
params["g"] == "apidiscovery.k8s.io" &&
params["v"] == "v2beta1" &&
params["as"] == "APIGroupDiscoveryList"
}
// ServerGroups returns the supported groups, with information like supported versions and the
// preferred version.
func (d *DiscoveryClient) ServerGroups() (*metav1.APIGroupList, error) {

72
discovery/discovery_client_test.go
View File

@ -1394,8 +1394,9 @@ func TestAggregatedServerGroups(t *testing.T) {
}
output, err := json.Marshal(agg)
require.NoError(t, err)
// Content-type is "aggregated" discovery format.
w.Header().Set("Content-Type", AcceptV2Beta1)
// Content-Type is "aggregated" discovery format. Add extra parameter
// to ensure we are resilient to these extra parameters.
w.Header().Set("Content-Type", AcceptV2Beta1+"; charset=utf-8")
w.WriteHeader(http.StatusOK)
w.Write(output)
}))
@ -1984,8 +1985,9 @@ func TestAggregatedServerGroupsAndResources(t *testing.T) {
}
output, err := json.Marshal(agg)
require.NoError(t, err)
// Content-type is "aggregated" discovery format.
w.Header().Set("Content-Type", AcceptV2Beta1)
// Content-type is "aggregated" discovery format. Add extra parameter
// to ensure we are resilient to these extra parameters.
w.Header().Set("Content-Type", AcceptV2Beta1+"; charset=utf-8")
w.WriteHeader(http.StatusOK)
w.Write(output)
}))
@ -2124,8 +2126,9 @@ func TestAggregatedServerGroupsAndResourcesWithErrors(t *testing.T) {
}
output, err := json.Marshal(agg)
require.NoError(t, err)
// Content-type is "aggregated" discovery format.
w.Header().Set("Content-Type", AcceptV2Beta1)
// Content-type is "aggregated" discovery format. Add extra parameter
// to ensure we are resilient to these extra parameters.
w.Header().Set("Content-Type", AcceptV2Beta1+"; charset=utf-8")
w.WriteHeader(status)
w.Write(output)
}))
@ -2732,8 +2735,9 @@ func TestAggregatedServerPreferredResources(t *testing.T) {
}
output, err := json.Marshal(agg)
require.NoError(t, err)
// Content-type is "aggregated" discovery format.
w.Header().Set("Content-Type", AcceptV2Beta1)
// Content-type is "aggregated" discovery format. Add extra parameter
// to ensure we are resilient to these extra parameters.
w.Header().Set("Content-Type", AcceptV2Beta1+"; charset=utf-8")
w.WriteHeader(http.StatusOK)
w.Write(output)
}))
@ -2757,6 +2761,58 @@ func TestAggregatedServerPreferredResources(t *testing.T) {
}
}
func TestDiscoveryContentTypeVersion(t *testing.T) {
tests := []struct {
contentType string
isV2Beta1 bool
}{
{
contentType: "application/json; g=apidiscovery.k8s.io;v=v2beta1;as=APIGroupDiscoveryList",
isV2Beta1: true,
},
{
// content-type parameters are not in correct order, but comparison ignores order.
contentType: "application/json; v=v2beta1;as=APIGroupDiscoveryList;g=apidiscovery.k8s.io",
isV2Beta1: true,
},
{
// content-type parameters are not in correct order, but comparison ignores order.
contentType: "application/json; as=APIGroupDiscoveryList;g=apidiscovery.k8s.io;v=v2beta1",
isV2Beta1: true,
},
{
// Ignores extra parameter "charset=utf-8"
contentType: "application/json; g=apidiscovery.k8s.io;v=v2beta1;as=APIGroupDiscoveryList;charset=utf-8",
isV2Beta1: true,
},
{
contentType: "application/json",
isV2Beta1: false,
},
{
contentType: "application/json; charset=UTF-8",
isV2Beta1: false,
},
{
contentType: "text/json",
isV2Beta1: false,
},
{
contentType: "text/html",
isV2Beta1: false,
},
{
contentType: "",
isV2Beta1: false,
},
}
for _, test := range tests {
isV2Beta1 := isV2Beta1ContentType(test.contentType)
assert.Equal(t, test.isV2Beta1, isV2Beta1)
}
}
func TestUseLegacyDiscovery(t *testing.T) {
// Default client sends aggregated discovery accept format (first) as well as legacy format.
server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {