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40 changes: 40 additions & 0 deletions
40
staging/src/k8s.io/client-go/plugin/pkg/client/auth/openstack/BUILD
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package(default_visibility = ["//visibility:public"]) | ||
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licenses(["notice"]) | ||
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load( | ||
"@io_bazel_rules_go//go:def.bzl", | ||
"go_library", | ||
"go_test", | ||
) | ||
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go_test( | ||
name = "go_default_test", | ||
srcs = ["openstack_test.go"], | ||
library = ":go_default_library", | ||
tags = ["automanaged"], | ||
) | ||
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go_library( | ||
name = "go_default_library", | ||
srcs = ["openstack.go"], | ||
tags = ["automanaged"], | ||
deps = [ | ||
"//vendor/github.com/golang/glog:go_default_library", | ||
"//vendor/github.com/gophercloud/gophercloud/openstack:go_default_library", | ||
"//vendor/k8s.io/client-go/rest:go_default_library", | ||
], | ||
) | ||
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filegroup( | ||
name = "package-srcs", | ||
srcs = glob(["**"]), | ||
tags = ["automanaged"], | ||
visibility = ["//visibility:private"], | ||
) | ||
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filegroup( | ||
name = "all-srcs", | ||
srcs = [":package-srcs"], | ||
tags = ["automanaged"], | ||
) |
161 changes: 161 additions & 0 deletions
161
staging/src/k8s.io/client-go/plugin/pkg/client/auth/openstack/openstack.go
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/* | ||
Copyright 2017 The Kubernetes Authors. | ||
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. | ||
*/ | ||
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package openstack | ||
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import ( | ||
"fmt" | ||
"net/http" | ||
"sync" | ||
"time" | ||
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"github.com/golang/glog" | ||
"github.com/gophercloud/gophercloud/openstack" | ||
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restclient "k8s.io/client-go/rest" | ||
) | ||
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func init() { | ||
if err := restclient.RegisterAuthProviderPlugin("openstack", newOpenstackAuthProvider); err != nil { | ||
glog.Fatalf("Failed to register openstack auth plugin: %s", err) | ||
} | ||
} | ||
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// DefaultTTLDuration is the time before a token gets expired. | ||
const DefaultTTLDuration = 10 * time.Minute | ||
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// openstackAuthProvider is an authprovider for openstack. this provider reads | ||
// the environment variables to determine the client identity, and generates a | ||
// token which will be inserted into the request header later. | ||
type openstackAuthProvider struct { | ||
ttl time.Duration | ||
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tokenGetter TokenGetter | ||
} | ||
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// TokenGetter returns a bearer token that can be inserted into request. | ||
type TokenGetter interface { | ||
Token() (string, error) | ||
} | ||
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type tokenGetter struct{} | ||
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// Token creates a token by authenticate with keystone. | ||
func (*tokenGetter) Token() (string, error) { | ||
options, err := openstack.AuthOptionsFromEnv() | ||
if err != nil { | ||
return "", fmt.Errorf("failed to read openstack env vars: %s", err) | ||
} | ||
client, err := openstack.AuthenticatedClient(options) | ||
if err != nil { | ||
return "", fmt.Errorf("authentication failed: %s", err) | ||
} | ||
return client.TokenID, nil | ||
} | ||
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// cachedGetter caches a token until it gets expired, after the expiration, it will | ||
// generate another token and cache it. | ||
type cachedGetter struct { | ||
mutex sync.Mutex | ||
tokenGetter TokenGetter | ||
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token string | ||
born time.Time | ||
ttl time.Duration | ||
} | ||
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// Token returns the current available token, create a new one if expired. | ||
func (c *cachedGetter) Token() (string, error) { | ||
c.mutex.Lock() | ||
defer c.mutex.Unlock() | ||
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var err error | ||
// no token or exceeds the TTL | ||
if c.token == "" || time.Now().Sub(c.born) > c.ttl { | ||
c.token, err = c.tokenGetter.Token() | ||
if err != nil { | ||
return "", fmt.Errorf("failed to get token: %s", err) | ||
} | ||
c.born = time.Now() | ||
} | ||
return c.token, nil | ||
} | ||
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// tokenRoundTripper implements the RoundTripper interface: adding the bearer token | ||
// into the request header. | ||
type tokenRoundTripper struct { | ||
http.RoundTripper | ||
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tokenGetter TokenGetter | ||
} | ||
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// RoundTrip adds the bearer token into the request. | ||
func (t *tokenRoundTripper) RoundTrip(req *http.Request) (*http.Response, error) { | ||
// if the authorization header already present, use it. | ||
if req.Header.Get("Authorization") != "" { | ||
return t.RoundTripper.RoundTrip(req) | ||
} | ||
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token, err := t.tokenGetter.Token() | ||
if err == nil { | ||
req.Header.Set("Authorization", "Bearer "+token) | ||
} else { | ||
glog.V(4).Infof("failed to get token: %s", err) | ||
} | ||
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return t.RoundTripper.RoundTrip(req) | ||
} | ||
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// newOpenstackAuthProvider creates an auth provider which works with openstack | ||
// environment. | ||
func newOpenstackAuthProvider(clusterAddress string, config map[string]string, persister restclient.AuthProviderConfigPersister) (restclient.AuthProvider, error) { | ||
var ttlDuration time.Duration | ||
var err error | ||
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ttl, found := config["ttl"] | ||
if !found { | ||
ttlDuration = DefaultTTLDuration | ||
// persist to config | ||
config["ttl"] = ttlDuration.String() | ||
if err = persister.Persist(config); err != nil { | ||
return nil, fmt.Errorf("failed to persist config: %s", err) | ||
} | ||
} else { | ||
ttlDuration, err = time.ParseDuration(ttl) | ||
if err != nil { | ||
return nil, fmt.Errorf("failed to parse ttl config: %s", err) | ||
} | ||
} | ||
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// TODO: read/persist client configuration(OS_XXX env vars) in config | ||
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return &openstackAuthProvider{ | ||
ttl: ttlDuration, | ||
tokenGetter: &tokenGetter{}, | ||
}, nil | ||
} | ||
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func (oap *openstackAuthProvider) WrapTransport(rt http.RoundTripper) http.RoundTripper { | ||
return &tokenRoundTripper{ | ||
RoundTripper: rt, | ||
tokenGetter: &cachedGetter{ | ||
tokenGetter: oap.tokenGetter, | ||
ttl: oap.ttl, | ||
}, | ||
} | ||
} | ||
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func (oap *openstackAuthProvider) Login() error { return nil } |
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