Add EnvVar AZURE_AUTHORITY_HOST

sdk/azidentity/azidentity.go

@@ -7,6 +7,7 @@ import (
 	"encoding/json"
 	"net/http"
 	"net/url"
+	"os"
 	"time"
 
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore"
@@ -118,16 +119,21 @@ type TokenCredentialOptions struct {
 // NewIdentityClientOptions initializes an instance of IdentityClientOptions with default settings
 // NewIdentityClientOptions initializes an instance of IdentityClientOptions with default settings
 func (c *TokenCredentialOptions) setDefaultValues() (*TokenCredentialOptions, error) {
+	authorityHost := defaultAuthorityHost
+	if envAuthorityHost := os.Getenv("AZURE_AUTHORITY_HOST"); envAuthorityHost != "" {
+		authorityHost = envAuthorityHost
+	}
+
 	if c == nil {
-		defaultAuthorityHostURL, err := url.Parse(defaultAuthorityHost)
+		defaultAuthorityHostURL, err := url.Parse(authorityHost)
 		if err != nil {
 			return nil, err
 		}
 		c = &TokenCredentialOptions{AuthorityHost: defaultAuthorityHostURL}
 	}
 
 	if c.AuthorityHost == nil {
-		defaultAuthorityHostURL, err := url.Parse(defaultAuthorityHost)
+		defaultAuthorityHostURL, err := url.Parse(authorityHost)
 		if err != nil {
 			return nil, err
 		}

sdk/azidentity/azidentity_test.go

@@ -5,11 +5,17 @@ package azidentity
 
 import (
 	"net/url"
+	"os"
 	"testing"
 
 	"github.com/Azure/azure-sdk-for-go/sdk/azcore"
 )
 
+const (
+	envHostString    = "https://mock.com/"
+	customHostString = "https://custommock.com/"
+)
+
 func Test_AuthorityHost_Parse(t *testing.T) {
 	_, err := url.Parse(defaultAuthorityHost)
 	if err != nil {
@@ -27,3 +33,54 @@ func Test_NonNilTokenCredentialOptsNilAuthorityHost(t *testing.T) {
 		t.Fatalf("Did not set default authority host")
 	}
 }
+
+func Test_SetEnvAuthorityHost(t *testing.T) {
+	err := os.Setenv("AZURE_AUTHORITY_HOST", envHostString)
+	if err != nil {
+		t.Fatalf("Unexpected error when initializing environment variables: %v", err)
+	}
+
+	opts := &TokenCredentialOptions{}
+	opts, err = opts.setDefaultValues()
+	if opts.AuthorityHost.String() != envHostString {
+		t.Fatalf("Unexpected error when get host from environment vairable: %v", err)
+	}
+
+	// Unset that host environment vairable to avoid other tests failed.
+	err = os.Unsetenv("AZURE_AUTHORITY_HOST")
+	if err != nil {
+		t.Fatalf("Unexpected error when unset environment vairable: %v", err)
+	}
+}
+
+func Test_CustomAuthorityHost(t *testing.T) {
+	err := os.Setenv("AZURE_AUTHORITY_HOST", envHostString)
+	if err != nil {
+		t.Fatalf("Unexpected error when initializing environment variables: %v", err)
+	}
+
+	customHost, err := url.Parse(customHostString)
+	if err != nil {
+		t.Fatalf("Received an error: %v", err)
+	}
+
+	opts := &TokenCredentialOptions{AuthorityHost: customHost}
+	opts, err = opts.setDefaultValues()
+	if opts.AuthorityHost.String() != customHostString {
+		t.Fatalf("Unexpected error when get host from environment vairable: %v", err)
+	}
+
+	// Unset that host environment vairable to avoid other tests failed.
+	err = os.Unsetenv("AZURE_AUTHORITY_HOST")
+	if err != nil {
+		t.Fatalf("Unexpected error when unset environment vairable: %v", err)
+	}
+}
+
+func Test_DefaultAuthorityHost(t *testing.T) {
+	opts := &TokenCredentialOptions{}
+	opts, err := opts.setDefaultValues()
+	if opts.AuthorityHost.String() != defaultAuthorityHost {
+		t.Fatalf("Unexpected error when set default AuthorityHost: %v", err)
+	}
+}