latest.go

package latest

import (
	"fmt"
	"strings"

	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
	klatest "github.com/GoogleCloudPlatform/kubernetes/pkg/api/latest"
	kmeta "github.com/GoogleCloudPlatform/kubernetes/pkg/api/meta"
	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"

	_ "github.com/openshift/origin/pkg/api"
	"github.com/openshift/origin/pkg/api/meta"
	"github.com/openshift/origin/pkg/api/v1beta1"
)

// Version is the string that represents the current external default version.
const Version = "v1beta1"

// OldestVersion is the string that represents the oldest server version supported,
// for client code that wants to hardcode the lowest common denominator.
const OldestVersion = "v1beta1"

// Versions is the list of versions that are recognized in code. The order provided
// may be assumed to be least feature rich to most feature rich, and clients may
// choose to prefer the latter items in the list over the former items when presented
// with a set of versions to choose.
var Versions = []string{"v1beta1"}

// Codec is the default codec for serializing output that should use
// the latest supported version.  Use this Codec when writing to
// disk, a data store that is not dynamically versioned, or in tests.
// This codec can decode any object that OpenShift is aware of.
var Codec = v1beta1.Codec

// accessor is the shared static metadata accessor for the API.
var accessor = kmeta.NewAccessor()

// ResourceVersioner describes a default versioner that can handle all types
// of versioning.
// TODO: when versioning changes, make this part of each API definition.
var ResourceVersioner runtime.ResourceVersioner = accessor

// SelfLinker can set or get the SelfLink field of all API types.
// TODO: when versioning changes, make this part of each API definition.
// TODO(lavalamp): Combine SelfLinker & ResourceVersioner interfaces, force all uses
// to go through the InterfacesFor method below.
var SelfLinker runtime.SelfLinker = accessor

// RESTMapper provides the default mapping between REST paths and the objects declared in api.Scheme and all known
// Kubernetes versions.
var RESTMapper kmeta.RESTMapper

// InterfacesFor returns the default Codec and ResourceVersioner for a given version
// string, or an error if the version is not known.
func InterfacesFor(version string) (*kmeta.VersionInterfaces, error) {
	switch version {
	case "v1beta1":
		return &kmeta.VersionInterfaces{
			Codec:            v1beta1.Codec,
			ObjectConvertor:  api.Scheme,
			MetadataAccessor: accessor,
		}, nil
	default:
		return nil, fmt.Errorf("unsupported storage version: %s (valid: %s)", version, strings.Join(Versions, ", "))
	}
}

// originTypes are the hardcoded types defined by the OpenShift API.
var originTypes = []string{
	"Build", "BuildConfig", "BuildLog",
	"Deployment", "DeploymentConfig",
	"Image", "ImageRepository", "ImageRepositoryMapping",
	"Template", "TemplateConfig",
	"Route",
	"Project",
	"User", "UserIdentityMapping",
	"OAuthClient", "OAuthClientAuthorization", "OAuthAccessToken", "OAuthAuthorizeToken",
	"Role", "RoleBinding", "Policy", "PolicyBinding", "ResourceAccessReview", "SubjectAccessReview",
}

// OriginKind returns true if OpenShift owns the kind described in a given apiVersion.
// TODO: make this based on scheme information or other behavior
func OriginKind(kind, apiVersion string) bool {
	for _, t := range originTypes {
		if t == kind {
			return true
		}
	}
	return false
}

func init() {
	kubeMapper := klatest.RESTMapper
	originMapper := kmeta.NewDefaultRESTMapper(
		Versions,
		func(version string) (*kmeta.VersionInterfaces, bool) {
			interfaces, err := InterfacesFor(version)
			if err != nil {
				return nil, false
			}
			return interfaces, true
		},
	)

	// list of versions we support on the server
	versions := Versions

	// versions that used mixed case URL formats
	versionMixedCase := map[string]bool{
		"v1beta1": true,
	}

	// backwards compatibility, prior to v1beta2, we identified the namespace as a query parameter
	versionToNamespaceScope := map[string]kmeta.RESTScope{
		"v1beta1": kmeta.RESTScopeNamespaceLegacy,
	}

	// the list of kinds that are scoped at the root of the api hierarchy
	// if a kind is not enumerated here, it is assumed to have a namespace scope
	kindToRootScope := map[string]bool{
		"Project": true,

		"User":                true,
		"Identity":            true,
		"UserIdentityMapping": true,

		"OAuthAccessToken":         true,
		"OAuthAuthorizeToken":      true,
		"OAuthClient":              true,
		"OAuthClientAuthorization": true,
	}

	// enumerate all supported versions, get the kinds, and register with the mapper how to address our resources
	for _, version := range versions {
		for kind := range api.Scheme.KnownTypes(version) {
			mixedCase, found := versionMixedCase[version]
			if !found {
				mixedCase = false
			}
			scope := versionToNamespaceScope[version]
			_, found = kindToRootScope[kind]
			if found {
				scope = kmeta.RESTScopeRoot
			}
			originMapper.Add(scope, kind, version, mixedCase)
		}
	}

	// For Origin we use MultiRESTMapper that handles both Origin and Kubernetes
	// objects
	RESTMapper = meta.MultiRESTMapper{originMapper, kubeMapper}
}