AzureCliCredential fails to get token because strptime() argument 1 must be str, not None

[sdebruyn]

• Package Name: azure-identity
• Package Version: 1.7.0
• Operating System: Linux-5.4.0-1059-azure-x86_64-with-glibc2.28 (Debian slim Buster)
• Python Version: 3.9.7

Bug description
AzureCliCredential fails to get token. Scope was "https://database.windows.net//.default"

[2021-11-09 00:08:54,452] {subprocess.py:78} INFO - 2021-11-08 23:08:54.451818 (MainThread): AzureCliCredential.get_token failed: strptime() argument 1 must be str, not None
[2021-11-09 00:08:54,452] {subprocess.py:78} INFO - Traceback (most recent call last):
[2021-11-09 00:08:54,452] {subprocess.py:78} INFO -   File "/home/airflow/.local/lib/python3.9/site-packages/azure/identity/_internal/decorators.py", line 30, in wrapper
[2021-11-09 00:08:54,452] {subprocess.py:78} INFO -     token = fn(*args, **kwargs)
[2021-11-09 00:08:54,452] {subprocess.py:78} INFO -   File "/home/airflow/.local/lib/python3.9/site-packages/azure/identity/_credentials/azure_cli.py", line 75, in get_token
[2021-11-09 00:08:54,453] {subprocess.py:78} INFO -     token = parse_token(output)
[2021-11-09 00:08:54,453] {subprocess.py:78} INFO -   File "/home/airflow/.local/lib/python3.9/site-packages/azure/identity/_credentials/azure_cli.py", line 94, in parse_token
[2021-11-09 00:08:54,453] {subprocess.py:78} INFO -     dt = datetime.strptime(token["expiresOn"], "%Y-%m-%d %H:%M:%S.%f")
[2021-11-09 00:08:54,453] {subprocess.py:78} INFO - TypeError: strptime() argument 1 must be str, not None

Context
Azure CLI is logged in using MSI

Command: az login -i
Output:

[2021-11-09 00:08:47,407] {subprocess.py:74} INFO - Output:
[2021-11-09 00:08:48,852] {subprocess.py:78} INFO - [
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -   {
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "environmentName": "AzureCloud",
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "homeTenantId": "xxx",
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "id": "xxx",
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "isDefault": true,
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "managedByTenants": [
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -       {
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -         "tenantId": "xxx"
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -       }
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     ],
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "name": "xxx",
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "state": "Enabled",
[2021-11-09 00:08:48,853] {subprocess.py:78} INFO -     "tenantId": "xxx",
[2021-11-09 00:08:48,854] {subprocess.py:78} INFO -     "user": {
[2021-11-09 00:08:48,854] {subprocess.py:78} INFO -       "assignedIdentityInfo": "MSI",
[2021-11-09 00:08:48,854] {subprocess.py:78} INFO -       "name": "systemAssignedIdentity",
[2021-11-09 00:08:48,854] {subprocess.py:78} INFO -       "type": "servicePrincipal"
[2021-11-09 00:08:48,854] {subprocess.py:78} INFO -     }
[2021-11-09 00:08:48,854] {subprocess.py:78} INFO -   }
[2021-11-09 00:08:48,854] {subprocess.py:78} INFO - ]

When I use az account get-access-token --resource https://database.windows.net/ I get null for the expiresOn:

{
  "accessToken": "ey...",
  "expiresOn": null,
  "subscription": "xxx",
  "tenant": "xxx",
  "tokenType": "Bearer"
}

[sdebruyn]

Source issue: Azure/azure-cli#20211
But maybe should be properly error handled here as well?

[xiangyan99]

@schaabs if expiresOn is null, should we give a default value? if yes, which one is suitable?

Thanks.

[xiangyan99]

@jiasli please see Charles' comment #22899 (comment).

Any opinion?