fed-sx-m1: Step 8c-art — GET /artifacts/{cid} route reusing match_prefix + 9 tests

next/kernel/http_server.erl

@@ -2,7 +2,8 @@
 -export([route/1, ok_response/1, not_found_response/0,
          welcome_body/0, capabilities_body/0,
          capabilities_path/0,
-         match_prefix/2, actors_prefix/0, actor_doc_response/1]).
+         match_prefix/2, actors_prefix/0, actor_doc_response/1,
+         artifacts_prefix/0, artifact_response/1]).
 
 %% HTTP request router per design §16.1.
 %%
@@ -35,16 +36,18 @@ dispatch(<<71, 69, 84>>,
          <<47,46,119,101,108,108,45,107,110,111,119,110,
            47,115,120,45,99,97,112,97,98,105,108,105,116,105,101,115>>) ->
     ok_response(capabilities_body());
-%% GET /actors/{id}
+%% GET /actors/{id} or /artifacts/{cid}
 dispatch(<<71, 69, 84>>, Path) ->
     case match_prefix(actors_prefix(), Path) of
-        {ok, Id} ->
-            case byte_size(Id) of
-                0 -> not_found_response();
-                _ -> actor_doc_response(Id)
-            end;
-        nomatch ->
-            not_found_response()
+        {ok, Id} when byte_size(Id) > 0 ->
+            actor_doc_response(Id);
+        _ ->
+            case match_prefix(artifacts_prefix(), Path) of
+                {ok, Cid} when byte_size(Cid) > 0 ->
+                    artifact_response(Cid);
+                _ ->
+                    not_found_response()
+            end
     end;
 dispatch(_, _) ->
     not_found_response().
@@ -112,3 +115,16 @@ actor_doc_response(Id) ->
     Pre = <<97,99,116,111,114,58,32>>,
     Body = <<Pre/binary, Id/binary, 10>>,
     ok_response(Body).
+
+%% "/artifacts/" — 11 bytes
+artifacts_prefix() ->
+    <<47,97,114,116,105,102,97,99,116,115,47>>.
+
+%% Artifact stub. Real implementation will fetch the bytes from
+%% the registry (or a CID-keyed store) and content-negotiate.
+%% v1 echoes the CID so route resolution can be tested.
+artifact_response(Cid) ->
+    %% "artifact: " — 10 bytes
+    Pre = <<97,114,116,105,102,97,99,116,58,32>>,
+    Body = <<Pre/binary, Cid/binary, 10>>,
+    ok_response(Body).