fix player/session id distinction and add /user/me api endpoint

main.go

@@ -38,6 +38,7 @@ func main() {
 	r := chi.NewRouter()
 	r.Post("/user/register", s.Register)
 	r.Post("/user/login", s.Login)
-	r.With(serve.WithPlayerID(sessions)).Get("/queue", s.Queue)
+	r.With(serve.WithSession(sessions)).Get("/user/me", s.Me)
+	r.With(serve.WithSession(sessions)).Get("/queue", s.Queue)
 	http.ListenAndServe(":8080", r)
 }

serve/session.go

@@ -34,25 +34,25 @@ func SetSession(w http.ResponseWriter, s player.Session) {
 	})
 }
 
-// WithPlayerID is a middleware that adds a player ID to the request context
+// WithSession is a middleware that adds a player ID to the request context
 // based on the session cookie content. If there is no such cookie, or its
-// value is invalid, the request fails with a 403 error.
-func WithPlayerID(sessions player.RowQuerier) func(http.Handler) http.Handler {
+// value is invalid, the request fails with a 401 error.
+func WithSession(sessions player.RowQuerier) func(http.Handler) http.Handler {
 	return func(next http.Handler) http.Handler {
 		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 			c, err := r.Cookie(sessionCookie)
 			if err != nil {
-				http.Error(w, "Forbidden", http.StatusForbidden)
+				http.Error(w, "unauthorized", http.StatusUnauthorized)
 				return
 			}
 			id, err := player.ParseSession(c.Value)
 			if err != nil {
-				http.Error(w, "Forbidden", http.StatusForbidden)
+				http.Error(w, "unauthorized", http.StatusUnauthorized)
 				return
 			}
 			p, err := player.FromSession(r.Context(), sessions, id, time.Now())
 			if err != nil {
-				http.Error(w, "Forbidden", http.StatusForbidden)
+				http.Error(w, "unauthorized", http.StatusUnauthorized)
 				return
 			}
 			ctx := with(r.Context(), p)
@@ -61,7 +61,7 @@ func WithPlayerID(sessions player.RowQuerier) func(http.Handler) http.Handler {
 	}
 }
 
-// Player returns the player ID set by WithPlayerID in the request context.
-func PlayerID(ctx context.Context) player.ID {
-	return value[player.ID](ctx)
+// Session returns the session ID set by WithSession in the request context.
+func Session(ctx context.Context) player.Session {
+	return value[player.Session](ctx)
 }

server.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"encoding/json"
 	"errors"
 	"log/slog"
 	"net/http"
@@ -20,14 +21,14 @@ import (
 type Server struct {
 	l *lobby.Lobby
 
-	creds    credsDB
-	sessions player.Execer
+	creds    db
+	sessions db
 
 	mu sync.Mutex
 	pp map[player.ID]*websocket.Conn
 }
 
-type credsDB interface {
+type db interface {
 	player.RowQuerier
 	player.Execer
 }
@@ -133,13 +134,32 @@ func (s *Server) Login(w http.ResponseWriter, r *http.Request) {
 	slog.InfoContext(ctx, "logged in", "player", p, "id", id)
 }
 
+func (s *Server) Me(w http.ResponseWriter, r *http.Request) {
+	id := serve.Session(r.Context())
+	if id == (player.Session{}) {
+		panic("missing player ID")
+	}
+	p, err := player.FromSession(r.Context(), s.sessions, id, time.Now())
+	if err != nil {
+		panic("session with no player id: " + err.Error())
+	}
+	q := struct {
+		ID player.ID `json:"id"`
+	}{p}
+	json.NewEncoder(w).Encode(q)
+}
+
 // Queue connects players to games. The connection immediately upgrades.
 // This handler MUST be wrapped in [serve.WithPlayerID].
 func (s *Server) Queue(w http.ResponseWriter, r *http.Request) {
-	p := serve.PlayerID(r.Context())
-	if p == (player.ID{}) {
+	id := serve.Session(r.Context())
+	if id == (player.Session{}) {
 		panic("missing player ID")
 	}
+	p, err := player.FromSession(r.Context(), s.sessions, id, time.Now())
+	if p == (player.ID{}) {
+		panic("session with no player id: " + err.Error())
+	}
 	person, err := s.accept(w, r, p)
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusBadRequest)