Workaround upstream PyGithub/PyGithub#2079

Fixes KIWI-TCMS-HD,
https://sentry.io/organizations/kiwitcms/issues/2835963408

Author: atodorov

tcms_github_app/utils.py

@@ -74,6 +74,53 @@ def get_installation(self, inst_id):
         )
 
 
+class PatchGithubIntegration(github.GithubIntegration):
+    def get_access_token(self, installation_id, user_id=None):
+        """
+        Workaround for KIWI-TCMS-HD,
+        https://sentry.io/organizations/kiwitcms/issues/2835963408
+
+        Remove when https://github.com/PyGithub/PyGithub/pull/2079 gets merged!
+        """
+        import requests  # pylint: disable=import-outside-toplevel
+        from github import Consts, GithubException, InstallationAuthorization  # pylint: disable=import-outside-toplevel
+
+        body = {}
+        if user_id:
+            body = {"user_id": user_id}
+        response = requests.post(
+            f"{self.base_url}/app/installations/{installation_id}/access_tokens",
+            headers={
+                "Authorization": f"Bearer {self.create_jwt()}",
+                "Accept": Consts.mediaTypeIntegrationPreview,
+                "User-Agent": "PyGithub/Python",
+            },
+            json=body,
+        )
+
+        if response.status_code == 201:  # pylint: disable=no-else-return
+            return InstallationAuthorization.InstallationAuthorization(
+                requester=None,  # not required, this is a NonCompletableGithubObject
+                headers={},  # not required, this is a NonCompletableGithubObject
+                attributes=response.json(),
+                completed=True,
+            )
+        elif response.status_code == 403:
+            raise GithubException.BadCredentialsException(  # pylint: disable=no-member
+                status=response.status_code, data=response.text,
+                headers=response.headers,
+            )
+        elif response.status_code == 404:
+            raise GithubException.UnknownObjectException(  # pylint: disable=no-member
+                status=response.status_code, data=response.text,
+                headers=response.headers,
+            )
+        raise GithubException.GithubException(  # pylint: disable=no-member
+            status=response.status_code, data=response.text,
+            headers=response.headers,
+        )
+
+
 def find_token_from_app_inst(gh_app, installation):
     """
         Find an installation access token for this app:
@@ -94,8 +141,8 @@ def find_token_from_app_inst(gh_app, installation):
 
 
 def github_rpc_from_inst(installation):
-    gh_app = github.GithubIntegration(settings.KIWI_GITHUB_APP_ID,
-                                      settings.KIWI_GITHUB_APP_PRIVATE_KEY)
+    gh_app = PatchGithubIntegration(settings.KIWI_GITHUB_APP_ID,
+                                    settings.KIWI_GITHUB_APP_PRIVATE_KEY)
 
     token = find_token_from_app_inst(gh_app, installation)
     return KiwiTCMSGithub(token)