imap_migration generates traceback

[dorsax]

Impacted versions

• OS Type: Ubuntu
• OS Version: 22.04 LTS
• Database Type: MySQL
• Database version: 8
• Modoboa: 2.1.2
• installer used: Yes
• Webserver: Nginx

Steps to reproduce

• have offlineimap installed and configured for a domain
• I double checked: all migrations are applied successfully
• got to the shell and run the following command:
• python manage.py generate_offlineimap_config

Current behavior

I get the fopllowing error message:

Traceback (most recent call last):
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 829, in _resolve_lookup
    current = current[bit]
TypeError: 'Migration' object is not subscriptable

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/srv/modoboa/env/lib/python3.10/site-packages/cryptography/fernet.py", line 133, in _verify_signature
    h.verify(data[-32:])
  File "/srv/modoboa/env/lib/python3.10/site-packages/cryptography/hazmat/primitives/hmac.py", line 72, in verify
    ctx.verify(signature)
  File "/srv/modoboa/env/lib/python3.10/site-packages/cryptography/hazmat/backends/openssl/hmac.py", line 85, in verify
    raise InvalidSignature("Signature did not match digest.")
cryptography.exceptions.InvalidSignature: Signature did not match digest.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/srv/modoboa/instance/manage.py", line 22, in <module>
    main()
  File "/srv/modoboa/instance/manage.py", line 18, in main
    execute_from_command_line(sys.argv)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/core/management/__init__.py", line 419, in execute_from_command_line
    utility.execute()
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/core/management/__init__.py", line 413, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/core/management/base.py", line 354, in run_from_argv
    self.execute(*args, **cmd_options)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/core/management/base.py", line 398, in execute
    output = self.handle(*args, **options)
  File "/srv/modoboa/env/lib/python3.10/site-packages/modoboa/imap_migration/management/commands/generate_offlineimap_config.py", line 41, in handle
    content = render_to_string(
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/loader.py", line 62, in render_to_string
    return template.render(context, request)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/backends/django.py", line 61, in render
    return self.template.render(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 170, in render
    return self._render(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 162, in _render
    return self.nodelist.render(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 938, in render
    bit = node.render_annotated(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/defaulttags.py", line 214, in render
    nodelist.append(node.render_annotated(context))
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 905, in render_annotated
    return self.render(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 988, in render
    output = self.filter_expression.resolve(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 671, in resolve
    obj = self.var.resolve(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 796, in resolve
    value = self._resolve_lookup(context)
  File "/srv/modoboa/env/lib/python3.10/site-packages/django/template/base.py", line 837, in _resolve_lookup
    current = getattr(current, bit)
  File "/srv/modoboa/env/lib/python3.10/site-packages/modoboa/imap_migration/models.py", line 50, in password
    return decrypt(self._password)
  File "/srv/modoboa/env/lib/python3.10/site-packages/modoboa/lib/cryptutils.py", line 42, in decrypt
    return smart_text(_get_fernet().decrypt(smart_bytes(encrypted_value)))
  File "/srv/modoboa/env/lib/python3.10/site-packages/cryptography/fernet.py", line 90, in decrypt
    return self._decrypt_data(data, timestamp, time_info)
  File "/srv/modoboa/env/lib/python3.10/site-packages/cryptography/fernet.py", line 151, in _decrypt_data
    self._verify_signature(data)
  File "/srv/modoboa/env/lib/python3.10/site-packages/cryptography/fernet.py", line 135, in _verify_signature
    raise InvalidToken
cryptography.fernet.InvalidToken

Expected behavior

getting the input files for offlineimap.

[Spitfireap]

linked to #3052