Merge pull request #186 from Teradata/MT255026_IDE-24569

enabling browser option for logmech

README.md

@@ -73,7 +73,10 @@ At a minimum, you need to specify `host`, `user`, `password`, `schema` (database
 
 ### Logmech
 
-The logon mechanism for Teradata jobs that dbt executes can be configured with the `logmech` configuration in your Teradata profile. The `logmech` field can be set to: `TD2`, `LDAP`, `KRB5`, `TDNEGO`. For more information on authentication options, go to [Teradata Vantage authentication documentation](https://docs.teradata.com/r/8Mw0Cvnkhv1mk1LEFcFLpw/0Ev5SyB6_7ZVHywTP7rHkQ).
+The logon mechanism for Teradata jobs that dbt executes can be configured with the `logmech` configuration in your Teradata profile. The `logmech` field can be set to: `TD2`, `LDAP`, `BROWSER`, `KRB5`, `TDNEGO`. For more information on authentication options, go to [Teradata Vantage authentication documentation](https://docs.teradata.com/r/8Mw0Cvnkhv1mk1LEFcFLpw/0Ev5SyB6_7ZVHywTP7rHkQ).
+
+> For the initial BROWSER authentication, the browser opens as expected, asking for the credentials. However, for every subsequent connection, a new browser tab opens, displaying the message 'TERADATA BROWSER AUTHENTICATION COMPLETED,' despite using an existing BROWSER session silently. This is the default behavior of the teradatasql driver, and there is no way to avoid this at the present time.
+
 
 ```yaml
 my-teradata-db-profile:

dbt/adapters/teradata/connections.py

@@ -70,11 +70,17 @@ class TeradataCredentials(Credentials):
     }
 
     def __post_init__(self):
-        if self.username is None:
-            raise dbt_common.exceptions.DbtRuntimeError("Must specify `user` in profile")
-        elif self.password is None:
-            raise dbt_common.exceptions.DbtRuntimeError("Must specify `password` in profile")
-        elif self.schema is None:
+        if self.logmech is not None and self.logmech.lower() == "browser":
+            # When logmech is "browser", username and password should not be provided.
+            if self.username is not None or self.password is not None:
+                raise dbt_common.exceptions.DbtRuntimeError(
+                    "Username and password should not be specified when logmech is 'browser'")
+        else:
+            if self.username is None:
+                raise dbt_common.exceptions.DbtRuntimeError("Must specify `user` in profile")
+            elif self.password is None:
+                raise dbt_common.exceptions.DbtRuntimeError("Must specify `password` in profile")
+        if self.schema is None:
             raise dbt_common.exceptions.DbtRuntimeError("Must specify `schema` in profile")
         # teradata classifies database and schema as the same thing
         if (