core: Bump AutoRest Dep

Bumps autorest dependency for Azure providers.

Fixes: #11131

vendor/github.com/Azure/go-autorest/autorest/autorest.go

@@ -16,6 +16,7 @@ and Responding. A typical pattern is:
     DoRetryForAttempts(5, time.Second))
 
   err = Respond(resp,
+    ByDiscardingBody(),
     ByClosing())
 
 Each phase relies on decorators to modify and / or manage processing. Decorators may first modify

vendor/github.com/Azure/go-autorest/autorest/azure/async.go

@@ -3,12 +3,13 @@ package azure
 import (
 	"bytes"
 	"fmt"
-	"github.com/Azure/go-autorest/autorest"
-	"github.com/Azure/go-autorest/autorest/date"
 	"io/ioutil"
 	"net/http"
 	"strings"
 	"time"
+
+	"github.com/Azure/go-autorest/autorest"
+	"github.com/Azure/go-autorest/autorest/date"
 )
 
 const (

vendor/github.com/Azure/go-autorest/autorest/azure/environments.go

@@ -19,93 +19,108 @@ var environments = map[string]Environment{
 
 // Environment represents a set of endpoints for each of Azure's Clouds.
 type Environment struct {
-	Name                      string `json:"name"`
+	Name                         string `json:"name"`
-	ManagementPortalURL       string `json:"managementPortalURL"`
+	ManagementPortalURL          string `json:"managementPortalURL"`
-	PublishSettingsURL        string `json:"publishSettingsURL"`
+	PublishSettingsURL           string `json:"publishSettingsURL"`
-	ServiceManagementEndpoint string `json:"serviceManagementEndpoint"`
+	ServiceManagementEndpoint    string `json:"serviceManagementEndpoint"`
-	ResourceManagerEndpoint   string `json:"resourceManagerEndpoint"`
+	ResourceManagerEndpoint      string `json:"resourceManagerEndpoint"`
-	ActiveDirectoryEndpoint   string `json:"activeDirectoryEndpoint"`
+	ActiveDirectoryEndpoint      string `json:"activeDirectoryEndpoint"`
-	GalleryEndpoint           string `json:"galleryEndpoint"`
+	GalleryEndpoint              string `json:"galleryEndpoint"`
-	KeyVaultEndpoint          string `json:"keyVaultEndpoint"`
+	KeyVaultEndpoint             string `json:"keyVaultEndpoint"`
-	GraphEndpoint             string `json:"graphEndpoint"`
+	GraphEndpoint                string `json:"graphEndpoint"`
-	StorageEndpointSuffix     string `json:"storageEndpointSuffix"`
+	StorageEndpointSuffix        string `json:"storageEndpointSuffix"`
-	SQLDatabaseDNSSuffix      string `json:"sqlDatabaseDNSSuffix"`
+	SQLDatabaseDNSSuffix         string `json:"sqlDatabaseDNSSuffix"`
-	TrafficManagerDNSSuffix   string `json:"trafficManagerDNSSuffix"`
+	TrafficManagerDNSSuffix      string `json:"trafficManagerDNSSuffix"`
-	KeyVaultDNSSuffix         string `json:"keyVaultDNSSuffix"`
+	KeyVaultDNSSuffix            string `json:"keyVaultDNSSuffix"`
-	ServiceBusEndpointSuffix  string `json:"serviceBusEndpointSuffix"`
+	ServiceBusEndpointSuffix     string `json:"serviceBusEndpointSuffix"`
+	ServiceManagementVMDNSSuffix string `json:"serviceManagementVMDNSSuffix"`
+	ResourceManagerVMDNSSuffix   string `json:"resourceManagerVMDNSSuffix"`
+	ContainerRegistryDNSSuffix   string `json:"containerRegistryDNSSuffix"`
 }
 
 var (
 	// PublicCloud is the default public Azure cloud environment
 	PublicCloud = Environment{
-		Name:                      "AzurePublicCloud",
+		Name:                         "AzurePublicCloud",
-		ManagementPortalURL:       "https://manage.windowsazure.com/",
+		ManagementPortalURL:          "https://manage.windowsazure.com/",
-		PublishSettingsURL:        "https://manage.windowsazure.com/publishsettings/index",
+		PublishSettingsURL:           "https://manage.windowsazure.com/publishsettings/index",
-		ServiceManagementEndpoint: "https://management.core.windows.net/",
+		ServiceManagementEndpoint:    "https://management.core.windows.net/",
-		ResourceManagerEndpoint:   "https://management.azure.com/",
+		ResourceManagerEndpoint:      "https://management.azure.com/",
-		ActiveDirectoryEndpoint:   "https://login.microsoftonline.com/",
+		ActiveDirectoryEndpoint:      "https://login.microsoftonline.com/",
-		GalleryEndpoint:           "https://gallery.azure.com/",
+		GalleryEndpoint:              "https://gallery.azure.com/",
-		KeyVaultEndpoint:          "https://vault.azure.net/",
+		KeyVaultEndpoint:             "https://vault.azure.net/",
-		GraphEndpoint:             "https://graph.windows.net/",
+		GraphEndpoint:                "https://graph.windows.net/",
-		StorageEndpointSuffix:     "core.windows.net",
+		StorageEndpointSuffix:        "core.windows.net",
-		SQLDatabaseDNSSuffix:      "database.windows.net",
+		SQLDatabaseDNSSuffix:         "database.windows.net",
-		TrafficManagerDNSSuffix:   "trafficmanager.net",
+		TrafficManagerDNSSuffix:      "trafficmanager.net",
-		KeyVaultDNSSuffix:         "vault.azure.net",
+		KeyVaultDNSSuffix:            "vault.azure.net",
-		ServiceBusEndpointSuffix:  "servicebus.azure.com",
+		ServiceBusEndpointSuffix:     "servicebus.azure.com",
+		ServiceManagementVMDNSSuffix: "cloudapp.net",
+		ResourceManagerVMDNSSuffix:   "cloudapp.azure.com",
+		ContainerRegistryDNSSuffix:   "azurecr.io",
 	}
 
 	// USGovernmentCloud is the cloud environment for the US Government
 	USGovernmentCloud = Environment{
-		Name:                      "AzureUSGovernmentCloud",
+		Name:                         "AzureUSGovernmentCloud",
-		ManagementPortalURL:       "https://manage.windowsazure.us/",
+		ManagementPortalURL:          "https://manage.windowsazure.us/",
-		PublishSettingsURL:        "https://manage.windowsazure.us/publishsettings/index",
+		PublishSettingsURL:           "https://manage.windowsazure.us/publishsettings/index",
-		ServiceManagementEndpoint: "https://management.core.usgovcloudapi.net/",
+		ServiceManagementEndpoint:    "https://management.core.usgovcloudapi.net/",
-		ResourceManagerEndpoint:   "https://management.usgovcloudapi.net/",
+		ResourceManagerEndpoint:      "https://management.usgovcloudapi.net/",
-		ActiveDirectoryEndpoint:   "https://login.microsoftonline.com/",
+		ActiveDirectoryEndpoint:      "https://login.microsoftonline.com/",
-		GalleryEndpoint:           "https://gallery.usgovcloudapi.net/",
+		GalleryEndpoint:              "https://gallery.usgovcloudapi.net/",
-		KeyVaultEndpoint:          "https://vault.usgovcloudapi.net/",
+		KeyVaultEndpoint:             "https://vault.usgovcloudapi.net/",
-		GraphEndpoint:             "https://graph.usgovcloudapi.net/",
+		GraphEndpoint:                "https://graph.usgovcloudapi.net/",
-		StorageEndpointSuffix:     "core.usgovcloudapi.net",
+		StorageEndpointSuffix:        "core.usgovcloudapi.net",
-		SQLDatabaseDNSSuffix:      "database.usgovcloudapi.net",
+		SQLDatabaseDNSSuffix:         "database.usgovcloudapi.net",
-		TrafficManagerDNSSuffix:   "usgovtrafficmanager.net",
+		TrafficManagerDNSSuffix:      "usgovtrafficmanager.net",
-		KeyVaultDNSSuffix:         "vault.usgovcloudapi.net",
+		KeyVaultDNSSuffix:            "vault.usgovcloudapi.net",
-		ServiceBusEndpointSuffix:  "servicebus.usgovcloudapi.net",
+		ServiceBusEndpointSuffix:     "servicebus.usgovcloudapi.net",
+		ServiceManagementVMDNSSuffix: "usgovcloudapp.net",
+		ResourceManagerVMDNSSuffix:   "cloudapp.windowsazure.us",
+		ContainerRegistryDNSSuffix:   "azurecr.io",
 	}
 
 	// ChinaCloud is the cloud environment operated in China
 	ChinaCloud = Environment{
-		Name:                      "AzureChinaCloud",
+		Name:                         "AzureChinaCloud",
-		ManagementPortalURL:       "https://manage.chinacloudapi.com/",
+		ManagementPortalURL:          "https://manage.chinacloudapi.com/",
-		PublishSettingsURL:        "https://manage.chinacloudapi.com/publishsettings/index",
+		PublishSettingsURL:           "https://manage.chinacloudapi.com/publishsettings/index",
-		ServiceManagementEndpoint: "https://management.core.chinacloudapi.cn/",
+		ServiceManagementEndpoint:    "https://management.core.chinacloudapi.cn/",
-		ResourceManagerEndpoint:   "https://management.chinacloudapi.cn/",
+		ResourceManagerEndpoint:      "https://management.chinacloudapi.cn/",
-		ActiveDirectoryEndpoint:   "https://login.chinacloudapi.cn/?api-version=1.0",
+		ActiveDirectoryEndpoint:      "https://login.chinacloudapi.cn/",
-		GalleryEndpoint:           "https://gallery.chinacloudapi.cn/",
+		GalleryEndpoint:              "https://gallery.chinacloudapi.cn/",
-		KeyVaultEndpoint:          "https://vault.azure.cn/",
+		KeyVaultEndpoint:             "https://vault.azure.cn/",
-		GraphEndpoint:             "https://graph.chinacloudapi.cn/",
+		GraphEndpoint:                "https://graph.chinacloudapi.cn/",
-		StorageEndpointSuffix:     "core.chinacloudapi.cn",
+		StorageEndpointSuffix:        "core.chinacloudapi.cn",
-		SQLDatabaseDNSSuffix:      "database.chinacloudapi.cn",
+		SQLDatabaseDNSSuffix:         "database.chinacloudapi.cn",
-		TrafficManagerDNSSuffix:   "trafficmanager.cn",
+		TrafficManagerDNSSuffix:      "trafficmanager.cn",
-		KeyVaultDNSSuffix:         "vault.azure.cn",
+		KeyVaultDNSSuffix:            "vault.azure.cn",
-		ServiceBusEndpointSuffix:  "servicebus.chinacloudapi.net",
+		ServiceBusEndpointSuffix:     "servicebus.chinacloudapi.net",
+		ServiceManagementVMDNSSuffix: "chinacloudapp.cn",
+		ResourceManagerVMDNSSuffix:   "cloudapp.azure.cn",
+		ContainerRegistryDNSSuffix:   "azurecr.io",
 	}
 
 	// GermanCloud is the cloud environment operated in Germany
 	GermanCloud = Environment{
-		Name:                      "AzureGermanCloud",
+		Name:                         "AzureGermanCloud",
-		ManagementPortalURL:       "http://portal.microsoftazure.de/",
+		ManagementPortalURL:          "http://portal.microsoftazure.de/",
-		PublishSettingsURL:        "https://manage.microsoftazure.de/publishsettings/index",
+		PublishSettingsURL:           "https://manage.microsoftazure.de/publishsettings/index",
-		ServiceManagementEndpoint: "https://management.core.cloudapi.de/",
+		ServiceManagementEndpoint:    "https://management.core.cloudapi.de/",
-		ResourceManagerEndpoint:   "https://management.microsoftazure.de/",
+		ResourceManagerEndpoint:      "https://management.microsoftazure.de/",
-		ActiveDirectoryEndpoint:   "https://login.microsoftonline.de/",
+		ActiveDirectoryEndpoint:      "https://login.microsoftonline.de/",
-		GalleryEndpoint:           "https://gallery.cloudapi.de/",
+		GalleryEndpoint:              "https://gallery.cloudapi.de/",
-		KeyVaultEndpoint:          "https://vault.microsoftazure.de/",
+		KeyVaultEndpoint:             "https://vault.microsoftazure.de/",
-		GraphEndpoint:             "https://graph.cloudapi.de/",
+		GraphEndpoint:                "https://graph.cloudapi.de/",
-		StorageEndpointSuffix:     "core.cloudapi.de",
+		StorageEndpointSuffix:        "core.cloudapi.de",
-		SQLDatabaseDNSSuffix:      "database.cloudapi.de",
+		SQLDatabaseDNSSuffix:         "database.cloudapi.de",
-		TrafficManagerDNSSuffix:   "azuretrafficmanager.de",
+		TrafficManagerDNSSuffix:      "azuretrafficmanager.de",
-		KeyVaultDNSSuffix:         "vault.microsoftazure.de",
+		KeyVaultDNSSuffix:            "vault.microsoftazure.de",
-		ServiceBusEndpointSuffix:  "servicebus.cloudapi.de",
+		ServiceBusEndpointSuffix:     "servicebus.cloudapi.de",
+		ServiceManagementVMDNSSuffix: "azurecloudapp.de",
+		ResourceManagerVMDNSSuffix:   "cloudapp.microsoftazure.de",
+		ContainerRegistryDNSSuffix:   "azurecr.io",
 	}
 )
 
@@ -121,8 +136,13 @@ func EnvironmentFromName(name string) (Environment, error) {
 
 // OAuthConfigForTenant returns an OAuthConfig with tenant specific urls
 func (env Environment) OAuthConfigForTenant(tenantID string) (*OAuthConfig, error) {
+	return OAuthConfigForTenant(env.ActiveDirectoryEndpoint, tenantID)
+}
+
+// OAuthConfigForTenant returns an OAuthConfig with tenant specific urls for target cloud auth endpoint
+func OAuthConfigForTenant(activeDirectoryEndpoint, tenantID string) (*OAuthConfig, error) {
 	template := "%s/oauth2/%s?api-version=%s"
-	u, err := url.Parse(env.ActiveDirectoryEndpoint)
+	u, err := url.Parse(activeDirectoryEndpoint)
 	if err != nil {
 		return nil, err
 	}

vendor/github.com/Azure/go-autorest/autorest/azure/token.go

@@ -91,7 +91,7 @@ type ServicePrincipalNoSecret struct {
 // SetAuthenticationValues is a method of the interface ServicePrincipalSecret
 // It only returns an error for the ServicePrincipalNoSecret type
 func (noSecret *ServicePrincipalNoSecret) SetAuthenticationValues(spt *ServicePrincipalToken, v *url.Values) error {
-	return fmt.Errorf("Manually created ServicePrincipalToken does not contain secret material to retrieve a new access token.")
+	return fmt.Errorf("Manually created ServicePrincipalToken does not contain secret material to retrieve a new access token")
 }
 
 // ServicePrincipalSecret is an interface that allows various secret mechanism to fill the form
@@ -138,7 +138,7 @@ func (secret *ServicePrincipalCertificateSecret) SignJwt(spt *ServicePrincipalTo
 	token := jwt.New(jwt.SigningMethodRS256)
 	token.Header["x5t"] = thumbprint
 	token.Claims = jwt.MapClaims{
-		"aud": spt.oauthConfig.TokenEndpoint,
+		"aud": spt.oauthConfig.TokenEndpoint.String(),
 		"iss": spt.clientID,
 		"sub": spt.clientID,
 		"jti": base64.URLEncoding.EncodeToString(jti),
@@ -302,7 +302,7 @@ func (spt *ServicePrincipalToken) refreshInternal(resource string) error {
 
 	var newToken Token
 	err = autorest.Respond(resp,
-		autorest.WithErrorUnlessOK(),
+		autorest.WithErrorUnlessStatusCode(http.StatusOK),
 		autorest.ByUnmarshallingJSON(&newToken),
 		autorest.ByClosing())
 	if err != nil {

vendor/github.com/Azure/go-autorest/autorest/client.go

@@ -8,6 +8,7 @@ import (
 	"log"
 	"net/http"
 	"net/http/cookiejar"
+	"runtime"
 	"time"
 )
 
@@ -22,13 +23,24 @@ const (
 	DefaultRetryAttempts = 3
 )
 
-var statusCodesForRetry = []int{
+var (
-	http.StatusRequestTimeout,      // 408
+	// defaultUserAgent builds a string containing the Go version, system archityecture and OS,
-	http.StatusInternalServerError, // 500
+	// and the go-autorest version.
-	http.StatusBadGateway,          // 502
+	defaultUserAgent = fmt.Sprintf("Go/%s (%s-%s) go-autorest/%s",
-	http.StatusServiceUnavailable,  // 503
+		runtime.Version(),
-	http.StatusGatewayTimeout,      // 504
+		runtime.GOARCH,
-}
+		runtime.GOOS,
+		Version(),
+	)
+
+	statusCodesForRetry = []int{
+		http.StatusRequestTimeout,      // 408
+		http.StatusInternalServerError, // 500
+		http.StatusBadGateway,          // 502
+		http.StatusServiceUnavailable,  // 503
+		http.StatusGatewayTimeout,      // 504
+	}
+)
 
 const (
 	requestFormat = `HTTP Request Begin ===================================================
@@ -140,13 +152,24 @@ type Client struct {
 // NewClientWithUserAgent returns an instance of a Client with the UserAgent set to the passed
 // string.
 func NewClientWithUserAgent(ua string) Client {
-	return Client{
+	c := Client{
 		PollingDelay:    DefaultPollingDelay,
 		PollingDuration: DefaultPollingDuration,
 		RetryAttempts:   DefaultRetryAttempts,
 		RetryDuration:   30 * time.Second,
-		UserAgent:       ua,
+		UserAgent:       defaultUserAgent,
 	}
+	c.AddToUserAgent(ua)
+	return c
+}
+
+// AddToUserAgent adds an extension to the current user agent
+func (c *Client) AddToUserAgent(extension string) error {
+	if extension != "" {
+		c.UserAgent = fmt.Sprintf("%s %s", c.UserAgent, extension)
+		return nil
+	}
+	return fmt.Errorf("Extension was empty, User Agent stayed as %s", c.UserAgent)
 }
 
 // Do implements the Sender interface by invoking the active Sender after applying authorization.

vendor/github.com/Azure/go-autorest/autorest/error.go

@@ -28,6 +28,9 @@ type DetailedError struct {
 
 	// Message is the error message.
 	Message string
+
+	// Service Error is the response body of failed API in bytes
+	ServiceError []byte
 }
 
 // NewError creates a new Error conforming object from the passed packageType, method, and

vendor/github.com/Azure/go-autorest/autorest/preparer.go

@@ -183,6 +183,16 @@ func WithBaseURL(baseURL string) PrepareDecorator {
 	}
 }
 
+// WithCustomBaseURL returns a PrepareDecorator that replaces brace-enclosed keys within the
+// request base URL (i.e., http.Request.URL) with the corresponding values from the passed map.
+func WithCustomBaseURL(baseURL string, urlParameters map[string]interface{}) PrepareDecorator {
+	parameters := ensureValueStrings(urlParameters)
+	for key, value := range parameters {
+		baseURL = strings.Replace(baseURL, "{"+key+"}", value, -1)
+	}
+	return WithBaseURL(baseURL)
+}
+
 // WithFormData returns a PrepareDecoratore that "URL encodes" (e.g., bar=baz&foo=quux) into the
 // http.Request body.
 func WithFormData(v url.Values) PrepareDecorator {

vendor/github.com/Azure/go-autorest/autorest/responder.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"encoding/xml"
 	"fmt"
+	"io"
 	"io/ioutil"
 	"net/http"
 	"strings"
@@ -87,6 +88,24 @@ func ByCopying(b *bytes.Buffer) RespondDecorator {
 	}
 }
 
+// ByDiscardingBody returns a RespondDecorator that first invokes the passed Responder after which
+// it copies the remaining bytes (if any) in the response body to ioutil.Discard. Since the passed
+// Responder is invoked prior to discarding the response body, the decorator may occur anywhere
+// within the set.
+func ByDiscardingBody() RespondDecorator {
+	return func(r Responder) Responder {
+		return ResponderFunc(func(resp *http.Response) error {
+			err := r.Respond(resp)
+			if err == nil && resp != nil && resp.Body != nil {
+				if _, err := io.Copy(ioutil.Discard, resp.Body); err != nil {
+					return fmt.Errorf("Error discarding the response body: %v", err)
+				}
+			}
+			return err
+		})
+	}
+}
+
 // ByClosing returns a RespondDecorator that first invokes the passed Responder after which it
 // closes the response body. Since the passed Responder is invoked prior to closing the response
 // body, the decorator may occur anywhere within the set.
@@ -128,6 +147,8 @@ func ByUnmarshallingJSON(v interface{}) RespondDecorator {
 			err := r.Respond(resp)
 			if err == nil {
 				b, errInner := ioutil.ReadAll(resp.Body)
+				// Some responses might include a BOM, remove for successful unmarshalling
+				b = bytes.TrimPrefix(b, []byte("\xef\xbb\xbf"))
 				if errInner != nil {
 					err = fmt.Errorf("Error occurred reading http.Response#Body - Error = '%v'", errInner)
 				} else if len(strings.Trim(string(b), " ")) > 0 {
@@ -165,17 +186,24 @@ func ByUnmarshallingXML(v interface{}) RespondDecorator {
 }
 
 // WithErrorUnlessStatusCode returns a RespondDecorator that emits an error unless the response
-// StatusCode is among the set passed. Since these are artificial errors, the response body
+// StatusCode is among the set passed. On error, response body is fully read into a buffer and
-// may still require closing.
+// presented in the returned error, as well as in the response body.
 func WithErrorUnlessStatusCode(codes ...int) RespondDecorator {
 	return func(r Responder) Responder {
 		return ResponderFunc(func(resp *http.Response) error {
 			err := r.Respond(resp)
 			if err == nil && !ResponseHasStatusCode(resp, codes...) {
-				err = NewErrorWithResponse("autorest", "WithErrorUnlessStatusCode", resp, "%v %v failed with %s",
+				derr := NewErrorWithResponse("autorest", "WithErrorUnlessStatusCode", resp, "%v %v failed with %s",
 					resp.Request.Method,
 					resp.Request.URL,
 					resp.Status)
+				if resp.Body != nil {
+					defer resp.Body.Close()
+					b, _ := ioutil.ReadAll(resp.Body)
+					derr.ServiceError = b
+					resp.Body = ioutil.NopCloser(bytes.NewReader(b))
+				}
+				err = derr
 			}
 			return err
 		})

vendor/github.com/Azure/go-autorest/autorest/sender.go

@@ -73,7 +73,7 @@ func SendWithSender(s Sender, r *http.Request, decorators ...SendDecorator) (*ht
 func AfterDelay(d time.Duration) SendDecorator {
 	return func(s Sender) Sender {
 		return SenderFunc(func(r *http.Request) (*http.Response, error) {
-			if !DelayForBackoff(d, 1, r.Cancel) {
+			if !DelayForBackoff(d, 0, r.Cancel) {
 				return nil, fmt.Errorf("autorest: AfterDelay canceled before full delay")
 			}
 			return s.Do(r)
@@ -97,7 +97,7 @@ func DoCloseIfError() SendDecorator {
 		return SenderFunc(func(r *http.Request) (*http.Response, error) {
 			resp, err := s.Do(r)
 			if err != nil {
-				Respond(resp, ByClosing())
+				Respond(resp, ByDiscardingBody(), ByClosing())
 			}
 			return resp, err
 		})
@@ -156,6 +156,7 @@ func DoPollForStatusCodes(duration time.Duration, delay time.Duration, codes ...
 
 				for err == nil && ResponseHasStatusCode(resp, codes...) {
 					Respond(resp,
+						ByDiscardingBody(),
 						ByClosing())
 					resp, err = SendWithSender(s, r,
 						AfterDelay(GetRetryAfter(resp, delay)))
@@ -257,6 +258,8 @@ func WithLogging(logger *log.Logger) SendDecorator {
 // passed attempt (i.e., an exponential backoff delay). Backoff duration is in seconds and can set
 // to zero for no delay. The delay may be canceled by closing the passed channel. If terminated early,
 // returns false.
+// Note: Passing attempt 1 will result in doubling "backoff" duration. Treat this as a zero-based attempt
+// count.
 func DelayForBackoff(backoff time.Duration, attempt int, cancel <-chan struct{}) bool {
 	select {
 	case <-time.After(time.Duration(backoff.Seconds()*math.Pow(2, float64(attempt))) * time.Second):

vendor/github.com/Azure/go-autorest/autorest/version.go

@@ -2,17 +2,28 @@ package autorest
 
 import (
 	"fmt"
+	"strings"
+	"sync"
 )
 
 const (
-	major        = "7"
+	major = 7
-	minor        = "0"
+	minor = 3
-	patch        = "0"
+	patch = 1
-	tag          = ""
+	tag   = ""
-	semVerFormat = "%s.%s.%s%s"
 )
 
+var versionLock sync.Once
+var version string
+
 // Version returns the semantic version (see http://semver.org).
 func Version() string {
-	return fmt.Sprintf(semVerFormat, major, minor, patch, tag)
+	versionLock.Do(func() {
+		version = fmt.Sprintf("v%d.%d.%d", major, minor, patch)
+
+		if trimmed := strings.TrimPrefix(tag, "-"); trimmed != "" {
+			version = fmt.Sprintf("%s-%s", version, trimmed)
+		}
+	})
+	return version
 }

vendor/vendor.json

@@ -276,48 +276,48 @@
 			"revisionTime": "2016-06-22T17:32:16Z"
 		},
 		{
-			"checksumSHA1": "eVSHe6GIHj9/ziFrQLZ1SC7Nn6k=",
+			"checksumSHA1": "U2+FgaMOPEFg/yHLD5RbiXI1cq4=",
 			"comment": "v7.0.5",
 			"path": "github.com/Azure/go-autorest/autorest",
-			"revision": "0781901f19f1e7db3034d97ec57af753db0bf808",
+			"revision": "a2fdd780c9a50455cecd249b00bdc3eb73a78e31",
-			"revisionTime": "2016-10-03T18:39:13Z",
+			"revisionTime": "2017-04-06T20:28:05Z",
-			"version": "v7.2.1",
+			"version": "v7.3.1",
-			"versionExact": "v7.2.1"
+			"versionExact": "v7.3.1"
 		},
 		{
-			"checksumSHA1": "z8FwqeLK0Pluo7FYC5k2MVBoils=",
+			"checksumSHA1": "ghrnc4vZv6q8zzeakZnrS8CGFhE=",
 			"comment": "v7.0.5",
 			"path": "github.com/Azure/go-autorest/autorest/azure",
-			"revision": "0781901f19f1e7db3034d97ec57af753db0bf808",
+			"revision": "a2fdd780c9a50455cecd249b00bdc3eb73a78e31",
-			"revisionTime": "2016-10-03T18:39:13Z",
+			"revisionTime": "2017-04-06T20:28:05Z",
-			"version": "v7.2.1",
+			"version": "v7.3.1",
-			"versionExact": "v7.2.1"
+			"versionExact": "v7.3.1"
 		},
 		{
 			"checksumSHA1": "q9Qz8PAxK5FTOZwgYKe5Lj38u4c=",
 			"comment": "v7.0.5",
 			"path": "github.com/Azure/go-autorest/autorest/date",
-			"revision": "0781901f19f1e7db3034d97ec57af753db0bf808",
+			"revision": "a2fdd780c9a50455cecd249b00bdc3eb73a78e31",
-			"revisionTime": "2016-10-03T18:39:13Z",
+			"revisionTime": "2017-04-06T20:28:05Z",
-			"version": "v7.2.1",
+			"version": "v7.3.1",
-			"versionExact": "v7.2.1"
+			"versionExact": "v7.3.1"
 		},
 		{
 			"checksumSHA1": "Ev8qCsbFjDlMlX0N2tYAhYQFpUc=",
 			"comment": "v7.0.5",
 			"path": "github.com/Azure/go-autorest/autorest/to",
-			"revision": "0781901f19f1e7db3034d97ec57af753db0bf808",
+			"revision": "a2fdd780c9a50455cecd249b00bdc3eb73a78e31",
-			"revisionTime": "2016-10-03T18:39:13Z",
+			"revisionTime": "2017-04-06T20:28:05Z",
-			"version": "v7.2.1",
+			"version": "v7.3.1",
-			"versionExact": "v7.2.1"
+			"versionExact": "v7.3.1"
 		},
 		{
 			"checksumSHA1": "oBixceM+55gdk47iff8DSEIh3po=",
 			"path": "github.com/Azure/go-autorest/autorest/validation",
-			"revision": "0781901f19f1e7db3034d97ec57af753db0bf808",
+			"revision": "a2fdd780c9a50455cecd249b00bdc3eb73a78e31",
-			"revisionTime": "2016-10-03T18:39:13Z",
+			"revisionTime": "2017-04-06T20:28:05Z",
-			"version": "v7.2.1",
+			"version": "v7.3.1",
-			"versionExact": "v7.2.1"
+			"versionExact": "v7.3.1"
 		},
 		{
 			"checksumSHA1": "ICScouhAqYHoJEpJlJMYg7EzgyY=",