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Add ACL Support

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
42/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
api, backend, testing

Research direction

Start with the WIT binding at stubs/wit_world/imports/acl.py and review the ACL interface and API requirements in this issue. Use test.toml with data/acl.json and @on_viceroy tests to verify opening an ACL, matching IPv4 and IPv6 addresses, parsing entry metadata, and returning None for misses.

Written by the indexing model from the issue text.

Description

Overview

Add support for Fastly's Access Control Lists (ACLs), providing IP-based blocklists and access control.

WIT Interface

interface acl {
  use types.{error, open-error, ip-address};

  resource acl {
    open: static func(name: string) -> result<acl, open-error>;
    lookup: func(ip-addr: ip-address) -> result<option<body>, acl-error>;
  }

  enum acl-error {
    too-many-requests,
    generic-error
  }
}

WIT bindings: stubs/wit_world/imports/acl.py

API Design

  • Implement ACL resource wrapper
  • lookup(ip) accepts str, IPv4Address, or IPv6Address and returns Optional[dict]
  • Parse JSON body response from WIT layer when IP matches ACL entry
  • Return None when IP not found in ACL (no match)

Cross-SDK Comparison: All SDKs expose open(name) and lookup(ip) returning entry with prefix, action, id fields. Simple consistent API across languages.

Viceroy Testing

Viceroy supports ACL with JSON file-based test data via test.toml:

[local_server]
# Path to JSON file with ACL entries
acls.my_blocklist = "../data/acl.json"

# Or using object syntax
acls.my_allowlist = { file = "../data/allowlist.json" }

ACL JSON file format maps IP addresses to metadata objects. Lookup operations work with test data. Tests can use @on_viceroy with file references in TOML configuration.

Reference

Dominant language
Python
Stars
5
Forks
1
No merged PRs in 30d

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

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