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Greenfield inbound-email foundation for Symfony. Transport-agnostic
InboundMessage + InboundAttachment DTOs, InboundEmailParser
interface, and InboundRouter that resolves an inbound email to an
existing ticket via canonical Message-ID parsing + signed Reply-To
verification.
Completes the 5-framework greenfield inbound set. Mirrors the NestJS
reference, the 5 per-framework inbound-verify PRs (Laravel, Rails,
Django, Adonis, WordPress), and the .NET / Spring / Go / Phoenix
greenfield routers.
Resolution order (first match wins):
1. In-Reply-To parsed via MessageIdUtil — cold-start path.
2. References parsed via MessageIdUtil, each id in order.
3. Signed Reply-To on toEmail verified via MessageIdUtil. Survives
clients that strip threading headers; forged signatures are
rejected via hash_equals (timing-safe).
4. Subject-line reference tag [{PREFIX}-...].
10 PHPUnit tests verify every branch, the forged-signature rejection,
the blank-secret skip, the ordering helper, and the InboundMessage
body() text/html preference logic.
Closes the core inbound webhook for Symfony end-to-end (stacked on #30's router foundation). Completes the 5-framework greenfield inbound set — .NET #24, Spring #27, Go #30, Phoenix #36, Symfony. - PostmarkInboundParser: normalizes Postmark's JSON webhook payload (FromFull / ToFull / Headers / Attachments) into InboundMessage. Extracts threading headers from the Headers array. Decodes base64 attachment content inline via base64_decode with strict=true; falls back gracefully to null when decoding fails. - InboundEmailController (#[Route] -attributed): POST /escalated/webhook/email/inbound - Dispatches to the matching parser by ?adapter=... query or X-Escalated-Adapter header. Parsers are injected via #[TaggedIterator('escalated.inbound_parser')] so host apps can register additional providers just by tagging their service. - Signature-guarded by X-Escalated-Inbound-Secret (constant-time hash_equals compare). Same secret that signs Reply-To — symmetric. - Returns 202 Accepted with { status, ticket_id } on success, 401 on secret mismatch, 400 on unknown adapter / invalid payload. 5 parser tests cover field extraction, threading header parsing, base64 attachment decoding, minimal-payload path, and the adapter name contract — all pass locally.
Adds Mailgun as the second supported inbound provider alongside Postmark (from #31). Completes Mailgun parity across all 5 greenfield frameworks — .NET #25, Spring #28, Go #31, Phoenix #37, Symfony. Register the service with the escalated.inbound_parser tag and the controller picks it up via TaggedIterator alongside PostmarkParser. Notes: - from: typically 'Name <email>' — extractFromName pulls the display portion, strips surrounding quotes. Falls back to sender field for the email. - Mailgun hosts attachment content behind a URL; we carry the URL in downloadUrl. A follow-up worker fetches + persists out-of-band. - Malformed attachments JSON degrades gracefully (empty list). 8 PHPUnit tests verified locally (8 tests, 19 assertions, OK).
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Recovers auto-closed #32. Rebased onto current master.