Replace principle by principal in kerberos-related code (#43679)

Kerberos has the notion of a [principal](https://web.mit.edu/kerberos/krb5-1.5/krb5-1.5.4/doc/krb5-user/What-is-a-Kerberos-Principal_003f.html). "principle" was a typo.

Signed-off-by: Balthazar Rouberol <brouberol@wikimedia.org>

airflow/security/kerberos.py

@@ -60,7 +60,7 @@ class KerberosMode(Enum):
     ONE_TIME = "one-time"
 
 
-def get_kerberos_principle(principal: str | None) -> str:
+def get_kerberos_principal(principal: str | None) -> str:
     """Retrieve Kerberos principal. Fallback to principal from Airflow configuration if not provided."""
     return principal or conf.get_mandatory_value("kerberos", "principal").replace("_HOST", get_hostname())
 
@@ -77,7 +77,7 @@ def renew_from_kt(principal: str | None, keytab: str, exit_on_fail: bool = True)
     # minutes to give ourselves a large renewal buffer.
     renewal_lifetime = f"{conf.getint('kerberos', 'reinit_frequency')}m"
 
-    cmd_principal = get_kerberos_principle(principal)
+    cmd_principal = get_kerberos_principal(principal)
     if conf.getboolean("kerberos", "forwardable"):
         forwardable = "-f"
     else:

newsfragments/43679.misc.rst

@@ -0,0 +1 @@
+Renamed ``airflow.security.kerberos.get_kerberos_principle`` to ``airflow.security.kerberos.get_kerberos_principal`` due to misspelling.

tests/security/test_kerberos.py

@@ -24,7 +24,7 @@
 import pytest
 
 from airflow.security import kerberos
-from airflow.security.kerberos import get_kerberos_principle, renew_from_kt
+from airflow.security.kerberos import get_kerberos_principal, renew_from_kt
 
 from tests_common.test_utils.config import conf_vars
 
@@ -285,13 +285,13 @@ def test_run(self, mock_sleep, mock_renew_from_kt):
             mock.call("test-principal", "/tmp/keytab"),
         ]
 
-    def test_get_kerberos_principle(self):
+    def test_get_kerberos_principal(self):
         expected_principal = "test-principal"
-        principal = get_kerberos_principle(expected_principal)
+        principal = get_kerberos_principal(expected_principal)
         assert principal == expected_principal
 
     @mock.patch("airflow.security.kerberos.get_hostname", return_value="REPLACEMENT_HOST")
     @mock.patch("airflow.security.kerberos.conf.get_mandatory_value", return_value="test-principal/_HOST")
-    def test_get_kerberos_principle_resolve_null_principal(self, get_madantory_value_mock, get_hostname_mock):
-        principal = get_kerberos_principle(principal=None)
+    def test_get_kerberos_principal_resolve_null_principal(self, get_madantory_value_mock, get_hostname_mock):
+        principal = get_kerberos_principal(principal=None)
         assert principal == "test-principal/REPLACEMENT_HOST"