Monorepo: consolidate 7 repos into one

Combines shared, blog, market, cart, events, federation, and account
into a single repository. Eliminates submodule sync, sibling model
copying at build time, and per-app CI orchestration.

Changes:
- Remove per-app .git, .gitmodules, .gitea, submodule shared/ dirs
- Remove stale sibling model copies from each app
- Update all 6 Dockerfiles for monorepo build context (root = .)
- Add build directives to docker-compose.yml
- Add single .gitea/workflows/ci.yml with change detection
- Add .dockerignore for monorepo build context
- Create __init__.py for federation and account (cross-app imports)

shared/events/handlers/ap_delivery_handler.py

@@ -0,0 +1,250 @@
+"""Deliver AP activities to remote followers.
+
+Registered as a wildcard handler — fires for every activity.  Skips
+non-public activities and those without an actor profile.
+
+Per-app delivery: activities are delivered using the domain that matches
+the follower's subscription.  A follower of ``@alice@blog.rose-ash.com``
+receives activities with ``actor: https://blog.rose-ash.com/users/alice``
+and signatures using that domain's key_id.  Aggregate followers
+(``app_domain='federation'``) receive the federation domain identity.
+
+Idempotent: successful deliveries are recorded in ap_delivery_log.
+On retry (at-least-once reaper), already-delivered inboxes are skipped.
+"""
+from __future__ import annotations
+
+import logging
+import os
+from collections import defaultdict
+
+import httpx
+from sqlalchemy import select, or_
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from shared.events.bus import register_activity_handler
+from shared.models.federation import ActorProfile, APActivity, APFollower, APDeliveryLog
+from shared.services.registry import services
+
+log = logging.getLogger(__name__)
+
+AP_CONTENT_TYPE = "application/activity+json"
+DELIVERY_TIMEOUT = 15  # seconds per request
+
+
+def _domain_for_app(app_name: str) -> str:
+    """Resolve the public AP domain for an app name."""
+    from shared.infrastructure.activitypub import _ap_domain
+    return _ap_domain(app_name)
+
+
+def _build_activity_json(activity: APActivity, actor: ActorProfile, domain: str) -> dict:
+    """Build the full AP activity JSON-LD for delivery."""
+    username = actor.preferred_username
+    actor_url = f"https://{domain}/users/{username}"
+
+    obj = dict(activity.object_data or {})
+
+    # Rewrite all URLs from the federation domain to the delivery domain
+    # so Mastodon's origin check passes (all IDs must match actor host).
+    import re
+    fed_domain = os.getenv("AP_DOMAIN", "federation.rose-ash.com")
+
+    def _rewrite(url: str) -> str:
+        if isinstance(url, str) and fed_domain in url:
+            return url.replace(f"https://{fed_domain}", f"https://{domain}")
+        return url
+
+    activity_id = _rewrite(activity.activity_id)
+    object_id = activity_id + "/object"
+
+    # Rewrite any federation-domain URLs in object_data
+    if "id" in obj:
+        obj["id"] = _rewrite(obj["id"])
+    if "attributedTo" in obj:
+        obj["attributedTo"] = _rewrite(obj["attributedTo"])
+
+    if activity.activity_type == "Delete":
+        obj.setdefault("id", object_id)
+        obj.setdefault("type", "Tombstone")
+    else:
+        obj.setdefault("id", object_id)
+        obj.setdefault("type", activity.object_type)
+        obj.setdefault("attributedTo", actor_url)
+        obj.setdefault("published", activity.published.isoformat() if activity.published else None)
+        obj.setdefault("to", ["https://www.w3.org/ns/activitystreams#Public"])
+        obj.setdefault("cc", [f"{actor_url}/followers"])
+        if activity.activity_type == "Update":
+            from datetime import datetime, timezone
+            obj["updated"] = datetime.now(timezone.utc).isoformat()
+
+    return {
+        "@context": [
+            "https://www.w3.org/ns/activitystreams",
+            "https://w3id.org/security/v1",
+        ],
+        "id": activity_id,
+        "type": activity.activity_type,
+        "actor": actor_url,
+        "published": activity.published.isoformat() if activity.published else None,
+        "to": ["https://www.w3.org/ns/activitystreams#Public"],
+        "cc": [f"{actor_url}/followers"],
+        "object": obj,
+    }
+
+
+async def _deliver_to_inbox(
+    client: httpx.AsyncClient,
+    inbox_url: str,
+    body: dict,
+    actor: ActorProfile,
+    domain: str,
+) -> int | None:
+    """POST signed activity to a single inbox. Returns status code or None on error."""
+    from shared.utils.http_signatures import sign_request
+    from urllib.parse import urlparse
+    import json
+
+    body_bytes = json.dumps(body).encode()
+    key_id = f"https://{domain}/users/{actor.preferred_username}#main-key"
+
+    parsed = urlparse(inbox_url)
+    headers = sign_request(
+        private_key_pem=actor.private_key_pem,
+        key_id=key_id,
+        method="POST",
+        path=parsed.path,
+        host=parsed.netloc,
+        body=body_bytes,
+    )
+    headers["Content-Type"] = AP_CONTENT_TYPE
+
+    try:
+        resp = await client.post(
+            inbox_url,
+            content=body_bytes,
+            headers=headers,
+            timeout=DELIVERY_TIMEOUT,
+        )
+        if resp.status_code < 300:
+            log.info("Delivered to %s → %d", inbox_url, resp.status_code)
+        else:
+            log.warning("Delivery to %s → %d: %s", inbox_url, resp.status_code, resp.text[:200])
+        return resp.status_code
+    except Exception:
+        log.exception("Delivery failed for %s", inbox_url)
+        return None
+
+
+async def on_any_activity(activity: APActivity, session: AsyncSession) -> None:
+    """Deliver a public activity to all matching followers of its actor."""
+
+    # Only deliver public activities that have an actor profile
+    if activity.visibility != "public":
+        return
+    if activity.actor_profile_id is None:
+        return
+    if not services.has("federation"):
+        return
+
+    # Load actor with private key
+    actor = (
+        await session.execute(
+            select(ActorProfile).where(ActorProfile.id == activity.actor_profile_id)
+        )
+    ).scalar_one_or_none()
+    if not actor or not actor.private_key_pem:
+        log.warning("Actor not found or missing key for activity %s", activity.activity_id)
+        return
+
+    # Load matching followers.
+    # Aggregate followers (app_domain='federation') always get everything.
+    # Per-app followers only get activities from their app.
+    origin_app = activity.origin_app
+    follower_filters = [APFollower.actor_profile_id == actor.id]
+
+    if origin_app and origin_app != "federation":
+        follower_filters.append(
+            or_(
+                APFollower.app_domain == "federation",
+                APFollower.app_domain == origin_app,
+            )
+        )
+
+    followers = (
+        await session.execute(
+            select(APFollower).where(*follower_filters)
+        )
+    ).scalars().all()
+
+    if not followers:
+        log.debug("No followers to deliver to for %s", activity.activity_id)
+        return
+
+    # Check delivery log — skip (inbox, domain) pairs already delivered (idempotency)
+    existing = (
+        await session.execute(
+            select(APDeliveryLog.inbox_url, APDeliveryLog.app_domain).where(
+                APDeliveryLog.activity_id == activity.id,
+                APDeliveryLog.status_code < 300,
+            )
+        )
+    ).all()
+    already_delivered: set[tuple[str, str]] = {(r[0], r[1]) for r in existing}
+
+    # Collect all (inbox, app_domain) pairs to deliver to.
+    # Each follower subscription gets its own delivery with the correct
+    # actor identity, so followers of @user@blog and @user@federation
+    # both see posts on their respective actor profiles.
+    delivery_pairs: set[tuple[str, str]] = set()
+    for f in followers:
+        if not f.follower_inbox:
+            continue
+        app_dom = f.app_domain or "federation"
+        pair = (f.follower_inbox, app_dom)
+        if pair not in already_delivered:
+            delivery_pairs.add(pair)
+
+    if not delivery_pairs:
+        if already_delivered:
+            log.info("All deliveries already done for %s", activity.activity_id)
+        return
+
+    if already_delivered:
+        log.info(
+            "Skipping %d already-delivered, delivering to %d remaining",
+            len(already_delivered), len(delivery_pairs),
+        )
+
+    # Group by domain to reuse activity JSON per domain
+    domain_inboxes: dict[str, list[str]] = defaultdict(list)
+    for inbox_url, app_dom in delivery_pairs:
+        domain_inboxes[app_dom].append(inbox_url)
+
+    log.info(
+        "Delivering %s to %d target(s) for @%s across %d domain(s)",
+        activity.activity_type, len(delivery_pairs),
+        actor.preferred_username, len(domain_inboxes),
+    )
+
+    async with httpx.AsyncClient() as client:
+        for app_dom, inboxes in domain_inboxes.items():
+            domain = _domain_for_app(app_dom)
+            activity_json = _build_activity_json(activity, actor, domain)
+
+            for inbox_url in inboxes:
+                status_code = await _deliver_to_inbox(
+                    client, inbox_url, activity_json, actor, domain
+                )
+                if status_code is not None and status_code < 300:
+                    session.add(APDeliveryLog(
+                        activity_id=activity.id,
+                        inbox_url=inbox_url,
+                        app_domain=app_dom,
+                        status_code=status_code,
+                    ))
+                    await session.flush()
+
+
+# Wildcard: fires for every activity
+register_activity_handler("*", on_any_activity)