func()

in cmd/ecr-credential-provider/main.go [62:131]
56 lines of code
12 McCabe index (conditional complexity)

func (e *ecrPlugin) GetCredentials(ctx context.Context, image string, args []string) (*v1alpha1.CredentialProviderResponse, error) {
	registryID, region, registry, err := parseRepoURL(image)
	if err != nil {
		return nil, err
	}

	if e.ecr == nil {
		e.ecr, err = defaultECRProvider(region, registryID)
		if err != nil {
			return nil, err
		}
	}

	output, err := e.ecr.GetAuthorizationToken(&ecr.GetAuthorizationTokenInput{
		RegistryIds: []*string{aws.String(registryID)},
	})
	if err != nil {
		return nil, err
	}

	if output == nil {
		return nil, errors.New("response output from ECR was nil")
	}

	if len(output.AuthorizationData) == 0 {
		return nil, errors.New("authorization data was empty")
	}

	data := output.AuthorizationData[0]
	if data.AuthorizationToken == nil {
		return nil, errors.New("authorization token in response was nil")
	}

	decodedToken, err := base64.StdEncoding.DecodeString(aws.StringValue(data.AuthorizationToken))
	if err != nil {
		return nil, err
	}

	parts := strings.SplitN(string(decodedToken), ":", 2)
	if len(parts) != 2 {
		return nil, errors.New("error parsing username and password from authorization token")
	}

	var cacheDuration *metav1.Duration
	expiresAt := data.ExpiresAt
	if expiresAt == nil {
		// explicitly set cache duration to 0 if expiresAt was nil so that
		// kubelet does not cache it in-memory
		cacheDuration = &metav1.Duration{Duration: 0}
	} else {
		// halving duration in order to compensate for the time loss between
		// the token creation and passing it all the way to kubelet.
		duration := time.Duration((expiresAt.Unix() - time.Now().Unix()) / 2)
		if duration > 0 {
			cacheDuration = &metav1.Duration{Duration: duration}
		}
	}

	return &v1alpha1.CredentialProviderResponse{
		CacheKeyType:  v1alpha1.RegistryPluginCacheKeyType,
		CacheDuration: cacheDuration,
		Auth: map[string]v1alpha1.AuthConfig{
			registry: {
				Username: parts[0],
				Password: parts[1],
			},
		},
	}, nil

}