feat: Added sas token authentication for azure backend

cmd/versitygw/azure.go

@@ -22,7 +22,7 @@ import (
 )
 
 var (
-	azAccount, azKey, azServiceURL string
+	azAccount, azKey, azServiceURL, azSASToken string
 )
 
 func azureCommand() *cli.Command {
@@ -46,6 +46,13 @@ func azureCommand() *cli.Command {
 				Aliases:     []string{"k"},
 				Destination: &azKey,
 			},
+			&cli.StringFlag{
+				Name:        "sas-token",
+				Usage:       "azure blob storage SAS token",
+				EnvVars:     []string{"AZ_SAS_TOKEN"},
+				Aliases:     []string{"st"},
+				Destination: &azSASToken,
+			},
 			&cli.StringFlag{
 				Name:        "url",
 				Usage:       "azure service URL",
@@ -63,7 +70,7 @@ func runAzure(ctx *cli.Context) error {
 		azServiceURL = fmt.Sprintf("https://%s.blob.core.windows.net/", azAccount)
 	}
 
-	be, err := azure.New(azAccount, azKey, azServiceURL)
+	be, err := azure.New(azAccount, azKey, azServiceURL, azSASToken)
 	if err != nil {
 		return fmt.Errorf("init azure: %v", err)
 	}