internal/db/queries.go

@@ -372,7 +372,21 @@ func (s *Database) GetDMsBefore(ctx context.Context, userA, userB int64, beforeI
 	return msgs, nil
 }
 
-// GetMOTD returns the server MOTD from config.
+// ChangeNick updates a user's nickname.
+func (s *Database) ChangeNick(ctx context.Context, userID int64, newNick string) error {
+	_, err := s.db.ExecContext(ctx,
+		"UPDATE users SET nick = ? WHERE id = ?", newNick, userID)
+	return err
+}
+
+// SetTopic sets the topic for a channel.
+func (s *Database) SetTopic(ctx context.Context, channelName string, _ int64, topic string) error {
+	_, err := s.db.ExecContext(ctx,
+		"UPDATE channels SET topic = ? WHERE name = ?", topic, channelName)
+	return err
+}
+
+// GetServerName returns the server name (unused, config provides this).
 func (s *Database) GetServerName() string {
 	return ""
 }

internal/handlers/api.go

@@ -30,8 +30,8 @@ func (s *Handlers) requireAuth(w http.ResponseWriter, r *http.Request) (int64, s
 	return uid, nick, true
 }
 
-// HandleRegister creates a new user and returns the auth token.
-func (s *Handlers) HandleRegister() http.HandlerFunc {
+// HandleCreateSession creates a new user session and returns the auth token.
+func (s *Handlers) HandleCreateSession() http.HandlerFunc {
 	type request struct {
 		Nick string `json:"nick"`
 	}
@@ -104,68 +104,6 @@ func (s *Handlers) HandleListAllChannels() http.HandlerFunc {
 	}
 }
 
-// HandleJoinChannel joins a channel (creates it if needed).
-func (s *Handlers) HandleJoinChannel() http.HandlerFunc {
-	type request struct {
-		Channel string `json:"channel"`
-	}
-	return func(w http.ResponseWriter, r *http.Request) {
-		uid, _, ok := s.requireAuth(w, r)
-		if !ok {
-			return
-		}
-		var req request
-		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
-			s.respondJSON(w, r, map[string]string{"error": "invalid request"}, http.StatusBadRequest)
-			return
-		}
-		req.Channel = strings.TrimSpace(req.Channel)
-		if req.Channel == "" {
-			s.respondJSON(w, r, map[string]string{"error": "channel name required"}, http.StatusBadRequest)
-			return
-		}
-		if !strings.HasPrefix(req.Channel, "#") {
-			req.Channel = "#" + req.Channel
-		}
-		chID, err := s.params.Database.GetOrCreateChannel(r.Context(), req.Channel)
-		if err != nil {
-			s.log.Error("get/create channel failed", "error", err)
-			s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
-			return
-		}
-		if err := s.params.Database.JoinChannel(r.Context(), chID, uid); err != nil {
-			s.log.Error("join channel failed", "error", err)
-			s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
-			return
-		}
-		s.respondJSON(w, r, map[string]string{"status": "joined", "channel": req.Channel}, http.StatusOK)
-	}
-}
-
-// HandlePartChannel leaves a channel.
-func (s *Handlers) HandlePartChannel() http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		uid, _, ok := s.requireAuth(w, r)
-		if !ok {
-			return
-		}
-		name := "#" + chi.URLParam(r, "channel")
-		var chID int64
-		err := s.params.Database.GetDB().QueryRowContext(r.Context(),
-			"SELECT id FROM channels WHERE name = ?", name).Scan(&chID)
-		if err != nil {
-			s.respondJSON(w, r, map[string]string{"error": "channel not found"}, http.StatusNotFound)
-			return
-		}
-		if err := s.params.Database.PartChannel(r.Context(), chID, uid); err != nil {
-			s.log.Error("part channel failed", "error", err)
-			s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
-			return
-		}
-		s.respondJSON(w, r, map[string]string{"status": "parted", "channel": name}, http.StatusOK)
-	}
-}
-
 // HandleChannelMembers returns members of a channel.
 func (s *Handlers) HandleChannelMembers() http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
@@ -211,15 +149,17 @@ func (s *Handlers) HandleGetMessages() http.HandlerFunc {
 	}
 }
 
-// HandleSendMessage sends a message to a channel or user.
-// The "to" field determines the target: "#channel" for channels, "nick" for DMs.
-func (s *Handlers) HandleSendMessage() http.HandlerFunc {
+// HandleSendCommand handles all C2S commands via POST /messages.
+// The "command" field dispatches to the appropriate logic.
+func (s *Handlers) HandleSendCommand() http.HandlerFunc {
 	type request struct {
-		To      string `json:"to"`
-		Content string `json:"content"`
+		Command string      `json:"command"`
+		To      string      `json:"to"`
+		Params  []string    `json:"params,omitempty"`
+		Body    interface{} `json:"body,omitempty"`
 	}
 	return func(w http.ResponseWriter, r *http.Request) {
-		uid, _, ok := s.requireAuth(w, r)
+		uid, nick, ok := s.requireAuth(w, r)
 		if !ok {
 			return
 		}
@@ -228,46 +168,167 @@ func (s *Handlers) HandleSendMessage() http.HandlerFunc {
 			s.respondJSON(w, r, map[string]string{"error": "invalid request"}, http.StatusBadRequest)
 			return
 		}
-		if strings.TrimSpace(req.Content) == "" {
-			s.respondJSON(w, r, map[string]string{"error": "content required"}, http.StatusBadRequest)
-			return
-		}
+		req.Command = strings.ToUpper(strings.TrimSpace(req.Command))
 		req.To = strings.TrimSpace(req.To)
-		if req.To == "" {
-			s.respondJSON(w, r, map[string]string{"error": "to field required"}, http.StatusBadRequest)
-			return
+
+		// Helper to extract body as string lines.
+		bodyLines := func() []string {
+			switch v := req.Body.(type) {
+			case []interface{}:
+				lines := make([]string, 0, len(v))
+				for _, item := range v {
+					if s, ok := item.(string); ok {
+						lines = append(lines, s)
+					}
+				}
+				return lines
+			case []string:
+				return v
+			default:
+				return nil
+			}
 		}
 
-		if strings.HasPrefix(req.To, "#") {
-			// Channel message
+		switch req.Command {
+		case "PRIVMSG", "NOTICE":
+			if req.To == "" {
+				s.respondJSON(w, r, map[string]string{"error": "to field required"}, http.StatusBadRequest)
+				return
+			}
+			lines := bodyLines()
+			if len(lines) == 0 {
+				s.respondJSON(w, r, map[string]string{"error": "body required"}, http.StatusBadRequest)
+				return
+			}
+			content := strings.Join(lines, "\n")
+
+			if strings.HasPrefix(req.To, "#") {
+				// Channel message
+				var chID int64
+				err := s.params.Database.GetDB().QueryRowContext(r.Context(),
+					"SELECT id FROM channels WHERE name = ?", req.To).Scan(&chID)
+				if err != nil {
+					s.respondJSON(w, r, map[string]string{"error": "channel not found"}, http.StatusNotFound)
+					return
+				}
+				msgID, err := s.params.Database.SendMessage(r.Context(), chID, uid, content)
+				if err != nil {
+					s.log.Error("send message failed", "error", err)
+					s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
+					return
+				}
+				s.respondJSON(w, r, map[string]any{"id": msgID, "status": "sent"}, http.StatusCreated)
+			} else {
+				// DM
+				targetID, err := s.params.Database.GetUserByNick(r.Context(), req.To)
+				if err != nil {
+					s.respondJSON(w, r, map[string]string{"error": "user not found"}, http.StatusNotFound)
+					return
+				}
+				msgID, err := s.params.Database.SendDM(r.Context(), uid, targetID, content)
+				if err != nil {
+					s.log.Error("send dm failed", "error", err)
+					s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
+					return
+				}
+				s.respondJSON(w, r, map[string]any{"id": msgID, "status": "sent"}, http.StatusCreated)
+			}
+
+		case "JOIN":
+			if req.To == "" {
+				s.respondJSON(w, r, map[string]string{"error": "to field required"}, http.StatusBadRequest)
+				return
+			}
+			channel := req.To
+			if !strings.HasPrefix(channel, "#") {
+				channel = "#" + channel
+			}
+			chID, err := s.params.Database.GetOrCreateChannel(r.Context(), channel)
+			if err != nil {
+				s.log.Error("get/create channel failed", "error", err)
+				s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
+				return
+			}
+			if err := s.params.Database.JoinChannel(r.Context(), chID, uid); err != nil {
+				s.log.Error("join channel failed", "error", err)
+				s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
+				return
+			}
+			s.respondJSON(w, r, map[string]string{"status": "joined", "channel": channel}, http.StatusOK)
+
+		case "PART":
+			if req.To == "" {
+				s.respondJSON(w, r, map[string]string{"error": "to field required"}, http.StatusBadRequest)
+				return
+			}
+			channel := req.To
+			if !strings.HasPrefix(channel, "#") {
+				channel = "#" + channel
+			}
 			var chID int64
 			err := s.params.Database.GetDB().QueryRowContext(r.Context(),
-				"SELECT id FROM channels WHERE name = ?", req.To).Scan(&chID)
+				"SELECT id FROM channels WHERE name = ?", channel).Scan(&chID)
 			if err != nil {
 				s.respondJSON(w, r, map[string]string{"error": "channel not found"}, http.StatusNotFound)
 				return
 			}
-			msgID, err := s.params.Database.SendMessage(r.Context(), chID, uid, req.Content)
-			if err != nil {
-				s.log.Error("send message failed", "error", err)
+			if err := s.params.Database.PartChannel(r.Context(), chID, uid); err != nil {
+				s.log.Error("part channel failed", "error", err)
 				s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
 				return
 			}
-			s.respondJSON(w, r, map[string]any{"id": msgID, "status": "sent"}, http.StatusCreated)
-		} else {
-			// DM
-			targetID, err := s.params.Database.GetUserByNick(r.Context(), req.To)
-			if err != nil {
-				s.respondJSON(w, r, map[string]string{"error": "user not found"}, http.StatusNotFound)
+			s.respondJSON(w, r, map[string]string{"status": "parted", "channel": channel}, http.StatusOK)
+
+		case "NICK":
+			lines := bodyLines()
+			if len(lines) == 0 {
+				s.respondJSON(w, r, map[string]string{"error": "body required (new nick)"}, http.StatusBadRequest)
 				return
 			}
-			msgID, err := s.params.Database.SendDM(r.Context(), uid, targetID, req.Content)
-			if err != nil {
-				s.log.Error("send dm failed", "error", err)
+			newNick := strings.TrimSpace(lines[0])
+			if newNick == "" || len(newNick) > 32 {
+				s.respondJSON(w, r, map[string]string{"error": "nick must be 1-32 characters"}, http.StatusBadRequest)
+				return
+			}
+			if err := s.params.Database.ChangeNick(r.Context(), uid, newNick); err != nil {
+				if strings.Contains(err.Error(), "UNIQUE") {
+					s.respondJSON(w, r, map[string]string{"error": "nick already in use"}, http.StatusConflict)
+					return
+				}
+				s.log.Error("change nick failed", "error", err)
 				s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
 				return
 			}
-			s.respondJSON(w, r, map[string]any{"id": msgID, "status": "sent"}, http.StatusCreated)
+			s.respondJSON(w, r, map[string]string{"status": "ok", "nick": newNick}, http.StatusOK)
+
+		case "TOPIC":
+			if req.To == "" {
+				s.respondJSON(w, r, map[string]string{"error": "to field required"}, http.StatusBadRequest)
+				return
+			}
+			lines := bodyLines()
+			if len(lines) == 0 {
+				s.respondJSON(w, r, map[string]string{"error": "body required (topic text)"}, http.StatusBadRequest)
+				return
+			}
+			topic := strings.Join(lines, " ")
+			channel := req.To
+			if !strings.HasPrefix(channel, "#") {
+				channel = "#" + channel
+			}
+			if err := s.params.Database.SetTopic(r.Context(), channel, uid, topic); err != nil {
+				s.log.Error("set topic failed", "error", err)
+				s.respondJSON(w, r, map[string]string{"error": "internal error"}, http.StatusInternalServerError)
+				return
+			}
+			s.respondJSON(w, r, map[string]string{"status": "ok", "topic": topic}, http.StatusOK)
+
+		case "PING":
+			s.respondJSON(w, r, map[string]string{"command": "PONG", "from": s.params.Config.ServerName}, http.StatusOK)
+
+		default:
+			_ = nick // suppress unused warning
+			s.respondJSON(w, r, map[string]string{"error": "unknown command: " + req.Command}, http.StatusBadRequest)
 		}
 	}
 }

internal/server/routes.go

@@ -52,18 +52,16 @@ func (s *Server) SetupRoutes() {
 	// API v1
 	s.router.Route("/api/v1", func(r chi.Router) {
 		r.Get("/server", s.h.HandleServerInfo())
-		r.Post("/register", s.h.HandleRegister())
+		r.Post("/session", s.h.HandleCreateSession())
 
 		// Unified state and message endpoints
 		r.Get("/state", s.h.HandleState())
 		r.Get("/messages", s.h.HandleGetMessages())
-		r.Post("/messages", s.h.HandleSendMessage())
+		r.Post("/messages", s.h.HandleSendCommand())
 		r.Get("/history", s.h.HandleGetHistory())
 
 		// Channels
-		r.Get("/channels/all", s.h.HandleListAllChannels())
-		r.Post("/channels/join", s.h.HandleJoinChannel())
-		r.Delete("/channels/{channel}", s.h.HandlePartChannel())
+		r.Get("/channels", s.h.HandleListAllChannels())
 		r.Get("/channels/{channel}/members", s.h.HandleChannelMembers())
 	})