[6.0.x] Refs #36810 -- Avoided infinite recursion in LazyNonce.__repr__().

Moved nonce generation in ``django.utils.csp.LazyNonce`` to a function
to avoid infinite recursion in ``SimpleLazyObject.__repr__`` for
unevaluated instances.

Co-authored-by: Natalia <124304+nessita@users.noreply.github.com>

Backport of 165c3599965e63f88649a46fcc2ff681c52f2f66 from main.

1 files changed, 9 insertions, 1 deletions

diff --git a/tests/utils_tests/test_csp.py b/tests/utils_tests/test_csp.py
index 86682544e2..c737b59256 100644
--- a/tests/utils_tests/test_csp.py
+++ b/tests/utils_tests/test_csp.py
@@ -2,7 +2,7 @@ from secrets import token_urlsafe
 from unittest.mock import patch
 
 from django.test import SimpleTestCase
-from django.utils.csp import CSP, LazyNonce, build_policy
+from django.utils.csp import CSP, LazyNonce, build_policy, generate_nonce
 from django.utils.functional import empty
 
 basic_config = {
@@ -155,6 +155,7 @@ class LazyNonceTests(SimpleTestCase):
         self.assertTrue(nonce)
         self.assertEqual(nonce, val)
         self.assertIsInstance(nonce, str)
+        self.assertEqual(repr(nonce), f"<LazyNonce: '{nonce}'>")
         self.assertEqual(len(val), 22)  # Based on secrets.token_urlsafe of 16 bytes.
         self.assertEqual(generated_tokens, [nonce])
         # Also test the wrapped value.
@@ -166,3 +167,10 @@ class LazyNonceTests(SimpleTestCase):
         second = str(nonce)
 
         self.assertEqual(first, second)
+
+    def test_repr(self):
+        nonce = LazyNonce()
+        self.assertEqual(repr(nonce), f"<LazyNonce: {repr(generate_nonce)}>")
+
+        str(nonce)  # Force nonce generation.
+        self.assertRegex(repr(nonce), r"<LazyNonce: '[^']+'>")