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feat: forc-mcp auth for mcp server hosting (#7300)
## Description

This PR introduces api-key based auth (and management endpoints for an
admin account) for the `forc-mcp` HTTP server.

Functionality includes:
- Admin-only API key management endpoints for creating, listing,
viewing, and deleting API keys
- Enhanced rate limiting with separate limits for public and
authenticated requests
- Flexible authentication modes supporting both public access and
API-key-only operation

The docs have been updated with details on how to add MCP server with
auth for claude and cursor.

Addresses https://github.com/FuelLabs/sway/issues/7301

<details>
<summary>Admin Endpoints</summary>

All admin endpoints require authentication with an admin API key via
`X-API-Key` header:

#### `POST` `/admin/api-keys`
- Creates new user-level API keys
- Returns the generated API key (shown only once for security)
- Generated keys use secure SHA256 hashing with `mcp_` prefix

#### `GET` `/admin/api-keys`
- Lists all API keys with usage statistics
- Optional include_admin=true query parameter to include admin keys
- Shows real-time usage counters and rate limit status

#### `GET` `/admin/api-keys/{key_id}`
- Retrieves details for a specific API key
- Returns `404` for admin keys to maintain security
- Includes current usage statistics

#### `DELETE` `/admin/api-keys/{key_id}`
- Deletes specific API keys
- Prevents deletion of admin keys (returns 403)
- Returns `204` on successful deletion

#### `POST` `/admin/import`
- Bulk imports API keys with historical usage data
- Supports merge mode (default) or replace mode with `clear_existing:
true`
- Useful for migration or backup restoration

</details>

### Dual-Tier Rate Limiting System

#### Public Requests (no API key):
- Default: `10` requests/minute, `1,000` requests/day
- Tracked by client IP address

#### Authenticated Requests (with API key):
- Default: `120` requests/minute, `10,000` requests/day
- Admin keys have unlimited access
- Tracked per API key with usage persistence

#### Intelligent Counter Reset Logic

- Per-minute counters reset after `60` seconds
- Daily counters reset at midnight (UTC date change)

### Authentication Modes

- Mixed Mode (Default)
  - Allows both public and authenticated access
  - Public requests get lower rate limits
  - API key holders get higher rate limits

- API Keys Only Mode
  - Set `api_keys_only: true` in configuration
  - Rejects all requests without valid API key
  - Suitable for production deployments requiring authentication

### Testing

- Unit tests for authentication middleware
- Integration tests for admin endpoints
- Rate limiting validation tests
- API key lifecycle tests (create, use, delete)
- Security tests (unauthorized access, role escalation)
- Persistence tests (file storage, restart recovery)


## Checklist

- [x] I have linked to any relevant issues.
- [x] I have commented my code, particularly in hard-to-understand
areas.
- [x] I have updated the documentation where relevant (API docs, the
reference, and the Sway book).
- [ ] If my change requires substantial documentation changes, I have
[requested support from the DevRel
team](https://github.com/FuelLabs/devrel-requests/issues/new/choose)
- [x] I have added tests that prove my fix is effective or that my
feature works.
- [x] I have added (or requested a maintainer to add) the necessary
`Breaking*` or `New Feature` labels where relevant.
- [x] I have done my best to ensure that my PR adheres to [the Fuel Labs
Code Review
Standards](https://github.com/FuelLabs/rfcs/blob/master/text/code-standards/external-contributors.md).
- [x] I have requested a review from the relevant team or maintainers.

---------

Co-authored-by: z <zees-dev@users.noreply.github.com>
Co-authored-by: Joshua Batty <joshpbatty@gmail.com>
2025-07-31 18:13:37 +12:00
..
book feat: forc-mcp auth for mcp server hosting (#7300) 2025-07-31 18:13:37 +12:00
reference Defining, parsing, and checking #[attribute]s (#6986) 2025-03-24 09:34:31 +11:00
slides Merge std and core libraries (#6729) 2025-03-12 23:52:38 +01:00
breaking-release-checklist.md Add docs for error handling (ABI errors, panic, error_type, error) (#7249) 2025-06-23 13:15:50 +00:00
internals.md Implements fully working hierarchical lexical scopes. (#6784) 2025-01-13 11:02:20 +11:00