Fixed the AzureTenantId in oauth.go (#210)

AzureTenantId was hardcoded as a constant which was linked to
".staging.azuredatabricks.net". Therefore, if the host URL was for
example from ".azuredatabricks.net", it failed to detect ClientId. I
replaced the const value with a map to find the AzureTenantId based on
the DSN host.

---------

Signed-off-by: Erfan Mahmoodnejad <erfan.mahmoodnejad@gmail.com>
Co-authored-by: Erfan Mahmoodnejad <erfan.mahmoodnejad@gmail.com>

auth/oauth/oauth.go

@@ -10,9 +10,13 @@ import (
 	"golang.org/x/oauth2"
 )
 
-const (
-	azureTenantId = "4a67d088-db5c-48f1-9ff2-0aace800ae68"
-)
+var azureTenants = map[string]string{
+	".dev.azuredatabricks.net":     "62a912ac-b58e-4c1d-89ea-b2dbfc7358fc",
+	".staging.azuredatabricks.net": "4a67d088-db5c-48f1-9ff2-0aace800ae68",
+	".azuredatabricks.net":         "2ff814a6-3304-4ab8-85cb-cd0e6f879c1d",
+	".databricks.azure.us":         "2ff814a6-3304-4ab8-85cb-cd0e6f879c1d",
+	".databricks.azure.cn":         "2ff814a6-3304-4ab8-85cb-cd0e6f879c1d",
+}
 
 func GetEndpoint(ctx context.Context, hostName string) (oauth2.Endpoint, error) {
 	if ctx == nil {
@@ -52,7 +56,7 @@ func GetScopes(hostName string, scopes []string) []string {
 
 	cloudType := InferCloudFromHost(hostName)
 	if cloudType == Azure {
-		userImpersonationScope := fmt.Sprintf("%s/user_impersonation", azureTenantId)
+		userImpersonationScope := fmt.Sprintf("%s/user_impersonation", azureTenants[GetAzureDnsZone(hostName)])
 		if !HasScope(scopes, userImpersonationScope) {
 			scopes = append(scopes, userImpersonationScope)
 		}
@@ -133,3 +137,12 @@ func InferCloudFromHost(hostname string) CloudType {
 	}
 	return Unknown
 }
+
+func GetAzureDnsZone(hostname string) string {
+	for _, d := range databricksAzureDomains {
+		if strings.Contains(hostname, d) {
+			return d
+		}
+	}
+	return ""
+}