The MediaAttacher used to roll its own SSRF guard with DNS resolution
and a static fakeUrlSafety() flag for tests. Validating URLs is a
request-layer concern, not a service-layer one. Laravel ships
'active_url' which does the same DNS resolvability check via
dns_get_record — applying it at the FormRequest / MCP validate() level
catches dead URLs upfront with a proper 422 instead of letting the
download silently fail.
- Replace the inline 'urls.*' => ['url:http,https'] rule with
['url:http,https', 'active_url'] in both Api/PostController::attachMedia
and Mcp/Tools/Post/AttachMediaFromUrlTool.
- Drop isUrlSafe(), fakeUrlSafety(), resetUrlSafety(), $skipUrlSafety
from MediaAttacher. The remaining defenses (Http::sink streaming +
progress abort at MAX_BYTES, allow_redirects: false, MIME allowlist)
cover the operational concerns.
- Restore tests/TestCase to the original setUp — no SSRF bypass needed
anymore because active_url is satisfied by the test hosts.
- Swap synthetic test hosts (cdn.example.com / evil.example.com) for
example.com / example.org. Both are RFC-reserved AND have stable A
records, so active_url accepts them while Http::fake() still
intercepts the actual request.
For SSRF defense beyond 'active_url' (which doesn't block private IPs),
trypost relies on production network egress controls. Open-source
self-hosters who run without a firewall accept the corresponding risk;
that's a deployment concern, not a request validation concern.
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