acme: ignore params in content-type check (#7342)

* acme: ignore params in content-type check

Fixes the warning in #7339

* Suppress coverage complaint in test

* Update CHANGELOG

* Repair symlink

Co-authored-by: Adrien Ferrand <adferrand@users.noreply.github.com>

3 files changed, 33 insertions, 0 deletions

diff --git a/acme/acme/client.py b/acme/acme/client.py
index 3e03748b5..cecb727c7 100644
--- a/acme/acme/client.py
+++ b/acme/acme/client.py
@@ -1022,6 +1022,9 @@ class ClientNetwork(object):
 
         """
         response_ct = response.headers.get('Content-Type')
+        # Strip parameters from the media-type (rfc2616#section-3.7)
+        if response_ct:
+            response_ct = response_ct.split(';')[0].strip()
         try:
             # TODO: response.json() is called twice, once here, and
             # once in _get and _post clients
diff --git a/acme/tests/client_test.py b/acme/tests/client_test.py
index a38fedbd6..a4966140f 100644
--- a/acme/tests/client_test.py
+++ b/acme/tests/client_test.py
@@ -980,6 +980,35 @@ class ClientNetworkTest(unittest.TestCase):
             self.assertEqual(
                 self.response, self.net._check_response(self.response))
 
+    @mock.patch('acme.client.logger')
+    def test_check_response_ok_ct_with_charset(self, mock_logger):
+        self.response.json.return_value = {}
+        self.response.headers['Content-Type'] = 'application/json; charset=utf-8'
+        # pylint: disable=protected-access
+        self.assertEqual(self.response, self.net._check_response(
+            self.response, content_type='application/json'))
+        try:
+            mock_logger.debug.assert_called_with(
+                'Ignoring wrong Content-Type (%r) for JSON decodable response',
+                'application/json; charset=utf-8'
+            )
+        except AssertionError:
+            return
+        raise AssertionError('Expected Content-Type warning ' #pragma: no cover
+            'to not have been logged')
+
+    @mock.patch('acme.client.logger')
+    def test_check_response_ok_bad_ct(self, mock_logger):
+        self.response.json.return_value = {}
+        self.response.headers['Content-Type'] = 'text/plain'
+        # pylint: disable=protected-access
+        self.assertEqual(self.response, self.net._check_response(
+            self.response, content_type='application/json'))
+        mock_logger.debug.assert_called_with(
+            'Ignoring wrong Content-Type (%r) for JSON decodable response',
+            'text/plain'
+        )
+
     def test_check_response_conflict(self):
         self.response.ok = False
         self.response.status_code = 409
diff --git a/certbot/CHANGELOG.md b/certbot/CHANGELOG.md
index 126b07eec..bc5ad90d6 100644
--- a/certbot/CHANGELOG.md
+++ b/certbot/CHANGELOG.md
@@ -14,6 +14,7 @@ Certbot adheres to [Semantic Versioning](https://semver.org/).
 ### Changed
 
 * certbot._internal.cli is now a package split in submodules instead of a whole module.
+* Fix acme module warnings when response Content-Type includes params (e.g. charset).
 
 ### Fixed