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Merge pull request #5815 from lodrem/arm/sdk/keyvault-credential
Introduce KeyVaultCredential for SDK v2
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /* | ||
| Copyright 2024 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. | ||
| */ | ||
|
|
||
| package armauth | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "net/http" | ||
| "strings" | ||
|
|
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| "github.com/Azure/azure-sdk-for-go/sdk/azcore" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/azcore/policy" | ||
| ) | ||
|
|
||
| const ( | ||
| HeaderAuthorizationAuxiliary = "x-ms-authorization-auxiliary" | ||
| ) | ||
|
|
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| type AuxiliaryAuthPolicy struct { | ||
| credentials []azcore.TokenCredential | ||
| scope string | ||
| } | ||
|
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| func NewAuxiliaryAuthPolicy(credentials []azcore.TokenCredential, scope string) *AuxiliaryAuthPolicy { | ||
| return &AuxiliaryAuthPolicy{ | ||
| credentials: credentials, | ||
| scope: scope, | ||
| } | ||
| } | ||
|
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| func (p *AuxiliaryAuthPolicy) Do(req *policy.Request) (*http.Response, error) { | ||
| tokens := make([]string, 0, len(p.credentials)) | ||
|
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| for _, cred := range p.credentials { | ||
| token, err := cred.GetToken(context.TODO(), policy.TokenRequestOptions{ | ||
| Scopes: []string{p.scope}, | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| tokens = append(tokens, fmt.Sprintf("Bearer %s", token.Token)) | ||
| } | ||
| req.Raw().Header.Set(HeaderAuthorizationAuxiliary, strings.Join(tokens, ", ")) | ||
| return req.Next() | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| Copyright 2024 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. | ||
| */ | ||
|
|
||
| package armauth | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "time" | ||
|
|
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| "github.com/Azure/azure-sdk-for-go/sdk/azcore" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/azcore/policy" | ||
| "github.com/Azure/azure-sdk-for-go/sdk/keyvault/azsecrets" | ||
| ) | ||
|
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| type KeyVaultCredential struct { | ||
| secretClient *azsecrets.Client | ||
| secretPath string | ||
|
|
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| token *azcore.AccessToken | ||
| } | ||
|
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| type KeyVaultCredentialSecret struct { | ||
| AccessToken string `json:"access_token"` | ||
| ExpiresOn time.Time `json:"expires_on"` | ||
| } | ||
|
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| func NewKeyVaultCredential( | ||
| msiCredential azcore.TokenCredential, | ||
| keyVaultURL string, | ||
| secretName string, | ||
| ) (*KeyVaultCredential, error) { | ||
| cli, err := azsecrets.NewClient(keyVaultURL, msiCredential, nil) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("create KeyVault client: %w", err) | ||
| } | ||
|
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| rv := &KeyVaultCredential{ | ||
| secretClient: cli, | ||
| secretPath: secretName, | ||
| } | ||
|
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| ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) | ||
| defer cancel() | ||
| if err := rv.refreshToken(ctx); err != nil { | ||
| return nil, fmt.Errorf("refresh token: %w", err) | ||
| } | ||
|
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| return rv, nil | ||
| } | ||
|
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| func (c *KeyVaultCredential) refreshToken(ctx context.Context) error { | ||
| const LatestVersion = "" | ||
|
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| resp, err := c.secretClient.GetSecret(ctx, c.secretPath, LatestVersion, nil) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if resp.Value == nil { | ||
| return fmt.Errorf("secret value is nil") | ||
| } | ||
|
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| var secret KeyVaultCredentialSecret | ||
| if err := json.Unmarshal([]byte(*resp.Value), &secret); err != nil { | ||
| return fmt.Errorf("unmarshal secret value `%s`: %w", *resp.Value, err) | ||
| } | ||
|
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| c.token = &azcore.AccessToken{ | ||
| Token: secret.AccessToken, | ||
| ExpiresOn: secret.ExpiresOn, | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (c *KeyVaultCredential) GetToken(ctx context.Context, opts policy.TokenRequestOptions) (azcore.AccessToken, error) { | ||
| const RefreshTokenOffset = 5 * time.Minute | ||
|
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| if c.token != nil && c.token.ExpiresOn.Add(RefreshTokenOffset).Before(time.Now()) { | ||
| return *c.token, nil | ||
| } | ||
|
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| if err := c.refreshToken(ctx); err != nil { | ||
| return azcore.AccessToken{}, fmt.Errorf("refresh token: %w", err) | ||
| } | ||
|
|
||
| return *c.token, nil | ||
| } |
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