|
| 1 | +package common |
| 2 | + |
| 3 | +import ( |
| 4 | + "context" |
| 5 | + "encoding/json" |
| 6 | + "fmt" |
| 7 | + "log" |
| 8 | + "net/http" |
| 9 | + "os/exec" |
| 10 | + "sync" |
| 11 | + "time" |
| 12 | + |
| 13 | + "github.com/Azure/go-autorest/autorest" |
| 14 | + "github.com/Azure/go-autorest/autorest/adal" |
| 15 | + "github.com/Azure/go-autorest/autorest/azure/cli" |
| 16 | +) |
| 17 | + |
| 18 | +type refreshableCliToken struct { |
| 19 | + resource string |
| 20 | + token *adal.Token |
| 21 | + lock *sync.RWMutex |
| 22 | + refreshMinutes int |
| 23 | +} |
| 24 | + |
| 25 | +// OAuthToken implements adal.OAuthTokenProvider |
| 26 | +func (rct *refreshableCliToken) OAuthToken() string { |
| 27 | + if rct == nil { |
| 28 | + return "" |
| 29 | + } |
| 30 | + if rct.token == nil { |
| 31 | + return "" |
| 32 | + } |
| 33 | + return rct.token.OAuthToken() |
| 34 | +} |
| 35 | + |
| 36 | +// EnsureFreshWithContext implements adal.RefresherWithContext |
| 37 | +func (rct *refreshableCliToken) EnsureFreshWithContext(ctx context.Context) error { |
| 38 | + refreshInterval := time.Duration(rct.refreshMinutes) * time.Minute |
| 39 | + if !rct.token.WillExpireIn(refreshInterval) { |
| 40 | + return nil |
| 41 | + } |
| 42 | + rct.lock.Lock() |
| 43 | + defer rct.lock.Unlock() |
| 44 | + if !rct.token.WillExpireIn(refreshInterval) { |
| 45 | + return nil |
| 46 | + } |
| 47 | + return rct.refreshInternal(rct.resource) |
| 48 | +} |
| 49 | + |
| 50 | +// RefreshWithContext implements adal.RefresherWithContext |
| 51 | +func (rct *refreshableCliToken) RefreshWithContext(ctx context.Context) error { |
| 52 | + rct.lock.Lock() |
| 53 | + defer rct.lock.Unlock() |
| 54 | + return rct.refreshInternal(rct.resource) |
| 55 | +} |
| 56 | + |
| 57 | +// RefreshExchangeWithContext implements adal.RefresherWithContext |
| 58 | +func (rct *refreshableCliToken) RefreshExchangeWithContext(ctx context.Context, resource string) error { |
| 59 | + rct.lock.Lock() |
| 60 | + defer rct.lock.Unlock() |
| 61 | + return rct.refreshInternal(rct.resource) |
| 62 | +} |
| 63 | + |
| 64 | +func (rct *refreshableCliToken) refreshInternal(resource string) (err error) { |
| 65 | + out, err := exec.Command("az", "account", "get-access-token", "--resource", resource).Output() |
| 66 | + if ee, ok := err.(*exec.ExitError); ok { |
| 67 | + err = fmt.Errorf("Cannot get access token: %s", string(ee.Stderr)) |
| 68 | + return |
| 69 | + } |
| 70 | + if err != nil { |
| 71 | + err = fmt.Errorf("Cannot get access token: %v", err) |
| 72 | + return |
| 73 | + } |
| 74 | + var cliToken cli.Token |
| 75 | + err = json.Unmarshal(out, &cliToken) |
| 76 | + if err != nil { |
| 77 | + return |
| 78 | + } |
| 79 | + token, err := cliToken.ToADALToken() |
| 80 | + if err != nil { |
| 81 | + return err |
| 82 | + } |
| 83 | + log.Printf("[INFO] Refreshed OAuth token for %s from Azure CLI, which expires on %s", resource, cliToken.ExpiresOn) |
| 84 | + rct.token = &token |
| 85 | + return |
| 86 | +} |
| 87 | + |
| 88 | +func (aa *AzureAuth) cliAuthorizer(resource string) (autorest.Authorizer, error) { |
| 89 | + rct := refreshableCliToken{ |
| 90 | + lock: &sync.RWMutex{}, |
| 91 | + resource: resource, |
| 92 | + refreshMinutes: 6, |
| 93 | + } |
| 94 | + err := rct.refreshInternal(resource) |
| 95 | + if err != nil { |
| 96 | + return nil, err |
| 97 | + } |
| 98 | + return autorest.NewBearerAuthorizer(&rct), nil |
| 99 | +} |
| 100 | + |
| 101 | +func (aa *AzureAuth) configureWithAzureCLI() (func(r *http.Request) error, error) { |
| 102 | + if aa.resourceID() == "" { |
| 103 | + return nil, nil |
| 104 | + } |
| 105 | + if aa.IsClientSecretSet() { |
| 106 | + return nil, nil |
| 107 | + } |
| 108 | + // verify that Azure CLI is authenticated |
| 109 | + _, err := cli.GetTokenFromCLI(AzureDatabricksResourceID) |
| 110 | + if err != nil { |
| 111 | + if err.Error() == "Invoking Azure CLI failed with the following error: " { |
| 112 | + return nil, fmt.Errorf("Most likely Azure CLI is not installed. " + |
| 113 | + "See https://docs.microsoft.com/en-us/cli/azure/?view=azure-cli-latest for details.") |
| 114 | + } |
| 115 | + return nil, err |
| 116 | + } |
| 117 | + if aa.UsePATForCLI { |
| 118 | + log.Printf("[INFO] Using Azure CLI authentication with session-generated PAT") |
| 119 | + return func(r *http.Request) error { |
| 120 | + pat, err := aa.acquirePAT(aa.cliAuthorizer) |
| 121 | + if err != nil { |
| 122 | + return err |
| 123 | + } |
| 124 | + r.Header.Set("Authorization", fmt.Sprintf("Bearer %s", pat.TokenValue)) |
| 125 | + return nil |
| 126 | + }, nil |
| 127 | + } |
| 128 | + log.Printf("[INFO] Using Azure CLI authentication with AAD tokens") |
| 129 | + return aa.simpleAADRequestVisitor(aa.cliAuthorizer) |
| 130 | +} |
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