Moderator Access Control: Implement Tiered Moderation Permissions for a Community Platform

Question

## Problem

Design a moderation access control system for a multi-community platform. Moderators have roles scoped to specific communities: `viewer`, `moderator`, `admin`. Implement:

```python
class ModerationSystem:
    def assign_role(self, moderator_id: str, community_id: str, role: str) -> None:
    def can_perform(
        self,
        moderator_id: str,
        community_id: str,
        action: str  # "view_reports"|"remove_post"|"ban_user"|"appoint_mod"
    ) -> bool:
    def revoke_role(self, moderator_id: str, community_id: str) -> bool:
    def list_moderators(self, community_id: str) -> list[dict]:
```

Permission matrix: `viewer` can `view_reports`; `moderator` adds `remove_post`, `ban_user`; `admin` adds `appoint_mod`.

## Example

```
mod_sys.assign_role("alice", "r/python", "moderator")
mod_sys.can_perform("alice", "r/python", "ban_user")    -> True
mod_sys.can_perform("alice", "r/python", "appoint_mod") -> False
mod_sys.can_perform("alice", "r/java",   "view_reports") -> False  # no role in r/java
```

## Follow-ups

1. How do you model global super-admins who can act in any community?
2. How would you audit every permission check and role change for compliance?
3. Roles change frequently — how do you cache permission checks without serving stale data?

Moderator Access Control: Implement Tiered Moderation Permissions for a Community Platform

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