fed-sx-m1: Step 4b-cod — 8 bootstrap codecs/sig-suites/audience files + manifest complete + 14 new parse tests (50 total)

next/genesis/audience/direct.sx

@@ -0,0 +1,14 @@
+;; next/genesis/audience/direct.sx
+;;
+;; Direct audience: an actor is a member iff they are
+;; explicitly named in the activity's :to or :cc lists. No
+;; group expansion — true direct addressing only.
+
+(DefineAudience
+  :name "Direct"
+  :doc "Direct-addressing predicate. Tests literal membership\n        in the activity's :to or :cc."
+  :member-of (fn
+    (actor audience)
+    (or
+      (member? actor (-> audience :to))
+      (member? actor (-> audience :cc)))))

next/genesis/audience/followers.sx

@@ -0,0 +1,14 @@
+;; next/genesis/audience/followers.sx
+;;
+;; Followers audience: an actor is a member iff they appear in
+;; the audience-owner's :followers set in the audience-graph
+;; projection. Federation (m2) wires this to peer delivery.
+
+(DefineAudience
+  :name "Followers"
+  :doc "Followers-of-owner predicate. Looks up the\n        audience-graph projection's :followers list for the\n        audience owner and tests membership."
+  :member-of (fn
+    (actor audience)
+    (member?
+      actor
+      (-> (get-projection :audience-graph) (-> audience :owner) :followers))))

next/genesis/audience/public.sx

@@ -0,0 +1,9 @@
+;; next/genesis/audience/public.sx
+;;
+;; Public audience: every actor is a member. Maps to the AP
+;; magic id `https://www.w3.org/ns/activitystreams#Public`.
+
+(DefineAudience
+  :name "Public"
+  :doc "Public audience predicate. Always returns true — every\n        actor on the network is considered a member."
+  :member-of (fn (actor audience) true))

next/genesis/codecs/dag-cbor.sx

@@ -0,0 +1,13 @@
+;; next/genesis/codecs/dag-cbor.sx
+;;
+;; Canonical CBOR encoding per IPLD dag-cbor. Used to compute
+;; envelope canonical bytes for signature coverage and to serialise
+;; the genesis bundle itself. In Erlang-on-SX mode the kernel
+;; dispatches to the host cid:to_string substrate (Step 1b) when
+;; this codec is requested.
+
+(DefineCodec
+  :name "dag-cbor"
+  :doc "Deterministic CBOR with dag-cbor restrictions: sorted\n        map keys, no floats unless required, no indefinite-length\n        items. The canonical wire format for fed-sx artifacts."
+  :encode (fn (term) (host-codec :dag-cbor :encode term))
+  :decode (fn (bytes) (host-codec :dag-cbor :decode bytes)))

next/genesis/codecs/dag-json.sx

@@ -0,0 +1,12 @@
+;; next/genesis/codecs/dag-json.sx
+;;
+;; JSON encoding with dag-json restrictions per IPLD: sorted map
+;; keys, no NaN / Infinity, no comments, CIDs as `{"/": "..."}`.
+;; Used as the human-readable wire format for ActivityPub interop
+;; (JSON-LD over dag-json).
+
+(DefineCodec
+  :name "dag-json"
+  :doc "Deterministic JSON with dag-json restrictions. Sorted\n        keys, CIDs as the {\"/\": \"...\"} object. Used by the\n        HTTP server (Step 8) for application/json responses."
+  :encode (fn (term) (host-codec :dag-json :encode term))
+  :decode (fn (bytes) (host-codec :dag-json :decode bytes)))

next/genesis/codecs/raw.sx

@@ -0,0 +1,12 @@
+;; next/genesis/codecs/raw.sx
+;;
+;; Identity codec — input bytes pass through unchanged in both
+;; directions. Used for already-encoded payloads and for binary
+;; artifacts (images, archives) whose CID is computed over the
+;; raw bytes directly.
+
+(DefineCodec
+  :name "raw"
+  :doc "Identity codec. The CID's multicodec byte is 0x55.\n        :encode and :decode return their input unchanged."
+  :encode (fn (bytes) bytes)
+  :decode (fn (bytes) bytes))

next/genesis/manifest.sx

@@ -41,6 +41,6 @@
   :validators ("validators/envelope-shape.sx"
     "validators/signature.sx"
     "validators/type-schema.sx")
-  :codecs ()
-  :sig-suites ()
-  :audience ())
+  :codecs ("codecs/dag-cbor.sx" "codecs/raw.sx" "codecs/dag-json.sx")
+  :sig-suites ("sig-suites/rsa-sha256-2018.sx" "sig-suites/ed25519-2020.sx")
+  :audience ("audience/public.sx" "audience/followers.sx" "audience/direct.sx"))

next/genesis/sig-suites/ed25519-2020.sx

@@ -0,0 +1,11 @@
+;; next/genesis/sig-suites/ed25519-2020.sx
+;;
+;; W3C Verifiable Credential signature suite — Ed25519 over
+;; canonical bytes, key material in multibase. Default suite
+;; for fed-sx actors per design §9.
+
+(DefineSigSuite
+  :name "ed25519-2020"
+  :doc "Ed25519 verification. Key carries publicKeyMultibase.\n        :verify takes canonical-bytes + signature + key and\n        returns bool. Real verification deferred to m2 once\n        crypto:verify_ed25519/3 BIF lands; v1 stand-in returns\n        false to defer all Ed25519-signed activities."
+  :verify (fn (canonical-bytes signature key) false)
+  :key-format (fn (key-doc) (string? (-> key-doc :publicKeyMultibase))))

next/genesis/sig-suites/rsa-sha256-2018.sx

@@ -0,0 +1,11 @@
+;; next/genesis/sig-suites/rsa-sha256-2018.sx
+;;
+;; W3C Verifiable Credential signature suite — RSA-SHA256 over
+;; canonical bytes, key material in PEM. Compatible with
+;; Mastodon's HTTP-Signatures / Linked-Data-Signatures-2017.
+
+(DefineSigSuite
+  :name "rsa-sha256-2018"
+  :doc "RSA-SHA256 verification. Key carries publicKeyPem.\n        :verify takes canonical-bytes + signature + key and\n        returns bool. Real verification deferred to m2 once\n        crypto:verify_rsa/3 BIF lands; v1 stand-in returns\n        false to defer all RSA-signed activities."
+  :verify (fn (canonical-bytes signature key) false)
+  :key-format (fn (key-doc) (string? (-> key-doc :publicKeyPem))))