fed-sx-m1: Step 8c-proj — GET /projections + /projections/{name} routes + 11 tests

next/kernel/http_server.erl

@@ -3,7 +3,9 @@
          welcome_body/0, capabilities_body/0,
          capabilities_path/0,
          match_prefix/2, actors_prefix/0, actor_doc_response/1,
-         artifacts_prefix/0, artifact_response/1]).
+         artifacts_prefix/0, artifact_response/1,
+         projections_list_path/0, projections_prefix/0,
+         projections_list_response/0, projection_response/1]).
 
 %% HTTP request router per design §16.1.
 %%
@@ -36,7 +38,11 @@ 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} or /artifacts/{cid}
+%% GET /projections — list stub. Comes before the /projections/{name}
+%% prefix clause because the bare path has no trailing slash.
+dispatch(<<71, 69, 84>>, <<47,112,114,111,106,101,99,116,105,111,110,115>>) ->
+    projections_list_response();
+%% GET /actors/{id} or /artifacts/{cid} or /projections/{name}
 dispatch(<<71, 69, 84>>, Path) ->
     case match_prefix(actors_prefix(), Path) of
         {ok, Id} when byte_size(Id) > 0 ->
@@ -46,7 +52,12 @@ dispatch(<<71, 69, 84>>, Path) ->
                 {ok, Cid} when byte_size(Cid) > 0 ->
                     artifact_response(Cid);
                 _ ->
-                    not_found_response()
+                    case match_prefix(projections_prefix(), Path) of
+                        {ok, Name} when byte_size(Name) > 0 ->
+                            projection_response(Name);
+                        _ ->
+                            not_found_response()
+                    end
             end
     end;
 dispatch(_, _) ->
@@ -128,3 +139,25 @@ artifact_response(Cid) ->
     Pre = <<97,114,116,105,102,97,99,116,58,32>>,
     Body = <<Pre/binary, Cid/binary, 10>>,
     ok_response(Body).
+
+%% "/projections" — 12 bytes (no trailing slash; the list endpoint)
+projections_list_path() ->
+    <<47,112,114,111,106,101,99,116,105,111,110,115>>.
+
+%% "/projections/" — 13 bytes (the per-projection prefix)
+projections_prefix() ->
+    <<47,112,114,111,106,101,99,116,105,111,110,115,47>>.
+
+%% Stub list response — real implementation queries the registry
+%% for active projections and serialises the name+CID list.
+projections_list_response() ->
+    %% "projections: (empty)\n" — hand-spelled
+    Body = <<112,114,111,106,101,99,116,105,111,110,115,58,32,
+             40,101,109,112,116,121,41,10>>,
+    ok_response(Body).
+
+projection_response(Name) ->
+    %% "projection: " — 12 bytes
+    Pre = <<112,114,111,106,101,99,116,105,111,110,58,32>>,
+    Body = <<Pre/binary, Name/binary, 10>>,
+    ok_response(Body).