added azure domain parameter

internal/backend/azure/azure.go

@@ -53,7 +53,13 @@ func open(cfg Config, rt http.RoundTripper) (*Backend, error) {
 	var client *azContainer.Client
 	var err error
 
-	url := fmt.Sprintf("https://%s.blob.core.windows.net/%s", cfg.AccountName, cfg.Container)
+	var endpointSuffix string
+	if cfg.EndpointSuffix != "" {
+		endpointSuffix = cfg.EndpointSuffix
+	} else {
+		endpointSuffix = "core.windows.net"
+	}
+	url := fmt.Sprintf("https://%s.blob.%s/%s", cfg.AccountName, endpointSuffix, cfg.Container)
 	opts := &azContainer.ClientOptions{
 		ClientOptions: azcore.ClientOptions{
 			Transport: &http.Client{Transport: rt},

internal/backend/azure/config.go

@@ -13,11 +13,12 @@ import (
 // Config contains all configuration necessary to connect to an azure compatible
 // server.
 type Config struct {
-	AccountName string
-	AccountSAS  options.SecretString
-	AccountKey  options.SecretString
-	Container   string
-	Prefix      string
+	AccountName    string
+	AccountSAS     options.SecretString
+	AccountKey     options.SecretString
+	EndpointSuffix string
+	Container      string
+	Prefix         string
 
 	Connections uint `option:"connections" help:"set a limit for the number of concurrent connections (default: 5)"`
 }
@@ -71,4 +72,7 @@ func (cfg *Config) ApplyEnvironment(prefix string) {
 	if cfg.AccountSAS.String() == "" {
 		cfg.AccountSAS = options.NewSecretString(os.Getenv(prefix + "AZURE_ACCOUNT_SAS"))
 	}
+	if cfg.EndpointSuffix == "" {
+		cfg.EndpointSuffix = os.Getenv("AZURE_ENDPOINT_SUFFIX")
+	}
 }