README.md

@@ -824,8 +824,9 @@ Set or change a channel's topic.
 - Updates the channel's topic in the database.
 - The TOPIC event is broadcast to all channel members.
 - If the channel doesn't exist, the server returns an error.
-- If the channel has mode `+t` (topic lock), only operators can change the
-  topic (not yet enforced).
+- If the channel has mode `+t` (topic lock, default: ON for new channels),
+  only operators (`+o`) can change the topic. Non-operators receive
+  `ERR_CHANOPRIVSNEEDED` (482).
 
 **Response:** `200 OK`
 ```json
@@ -1020,16 +1021,23 @@ WHOIS responses (e.g., target user's current client IP and hostname).
 
 **IRC reference:** RFC 1459 §4.1.5
 
-#### KICK — Kick User (Planned)
+#### KICK — Kick User
 
-Remove a user from a channel.
+Remove a user from a channel. Only channel operators (`+o`) can use this
+command. The kicked user and all channel members receive the KICK message.
 
 **C2S:**
 ```json
-{"command": "KICK", "to": "#general", "params": ["bob"], "body": ["misbehaving"]}
+{"command": "KICK", "to": "#general", "body": ["bob", "misbehaving"]}
 ```
 
-**Status:** Not yet implemented.
+The first element of `body` is the target nick, the second (optional) is the
+reason. If no reason is provided, the kicker's nick is used as the default.
+
+**Errors:**
+- `482` (ERR_CHANOPRIVSNEEDED) — kicker is not a channel operator
+- `441` (ERR_USERNOTINCHANNEL) — target is not in the channel
+- `403` (ERR_NOSUCHCHANNEL) — channel does not exist
 
 **IRC reference:** RFC 1459 §4.2.8
 
@@ -1071,8 +1079,8 @@ the server to the client (never C2S) and use 3-digit string codes in the
 | `001` | RPL_WELCOME         | After session creation | `{"command":"001","to":"alice","body":["Welcome to the network, alice"]}` |
 | `002` | RPL_YOURHOST        | After session creation | `{"command":"002","to":"alice","body":["Your host is neoirc, running version 0.1"]}` |
 | `003` | RPL_CREATED         | After session creation | `{"command":"003","to":"alice","body":["This server was created 2026-02-10"]}` |
-| `004` | RPL_MYINFO          | After session creation | `{"command":"004","to":"alice","params":["neoirc","0.1","","imnst"]}` |
-| `005` | RPL_ISUPPORT        | After session creation | `{"command":"005","to":"alice","params":["CHANTYPES=#","NICKLEN=32","NETWORK=neoirc"],"body":["are supported by this server"]}` |
+| `004` | RPL_MYINFO          | After session creation | `{"command":"004","to":"alice","params":["neoirc","0.1","","mnst"]}` |
+| `005` | RPL_ISUPPORT        | After session creation | `{"command":"005","to":"alice","params":["CHANTYPES=#","NICKLEN=32","PREFIX=(ov)@+","CHANMODES=,,H,mnst","NETWORK=neoirc"],"body":["are supported by this server"]}` |
 | `221` | RPL_UMODEIS         | In response to user MODE query | `{"command":"221","to":"alice","body":["+"]}` |
 | `251` | RPL_LUSERCLIENT     | On connect or LUSERS command | `{"command":"251","to":"alice","body":["There are 5 users and 0 invisible on 1 servers"]}` |
 | `252` | RPL_LUSEROP         | On connect or LUSERS command | `{"command":"252","to":"alice","params":["0"],"body":["operator(s) online"]}` |
@@ -1118,25 +1126,34 @@ carries IRC-style parameters (e.g., channel name, target nick).
 
 Inspired by IRC, simplified:
 
-| Mode | Name           | Meaning |
-|------|----------------|---------|
-| `+i` | Invite-only    | Only invited users can join |
-| `+m` | Moderated      | Only voiced (`+v`) users and operators (`+o`) can send |
-| `+s` | Secret         | Channel hidden from LIST response |
-| `+t` | Topic lock     | Only operators can change the topic |
-| `+n` | No external    | Only channel members can send messages to the channel |
-| `+H` | Hashcash       | Requires proof-of-work for PRIVMSG (parameter: bits, e.g. `+H 20`) |
+| Mode | Name           | Meaning | Status |
+|------|----------------|---------|--------|
+| `+m` | Moderated      | Only voiced (`+v`) users and operators (`+o`) can send | **Enforced** |
+| `+t` | Topic lock     | Only operators can change the topic (default: ON) | **Enforced** |
+| `+n` | No external    | Only channel members can send messages to the channel | **Enforced** |
+| `+H` | Hashcash       | Requires proof-of-work for PRIVMSG (parameter: bits, e.g. `+H 20`) | **Enforced** |
+| `+i` | Invite-only    | Only invited users can join | Not yet enforced |
+| `+s` | Secret         | Channel hidden from LIST response | Not yet enforced |
 
 **User channel modes (set per-user per-channel):**
 
-| Mode | Meaning | Display prefix |
-|------|---------|----------------|
-| `+o` | Operator | `@` in NAMES reply |
-| `+v` | Voice    | `+` in NAMES reply |
+| Mode | Meaning | Display prefix | Status |
+|------|---------|----------------|--------|
+| `+o` | Operator | `@` in NAMES reply | **Enforced** |
+| `+v` | Voice    | `+` in NAMES reply | **Enforced** |
 
-**Status:** Channel modes are defined but not yet enforced. The `modes` column
-exists in the channels table but the server does not check modes on actions.
-Exception: `+H` (hashcash) is fully enforced — see below.
+**Channel creator auto-op:** The first user to JOIN a channel (creating it)
+automatically receives `+o` operator status.
+
+**KICK command:** Channel operators can remove users with `KICK #channel nick
+[:reason]`. The kicked user and all channel members receive the KICK message.
+
+**NOTICE:** Follows RFC 2812 — NOTICE never triggers auto-replies (including
+RPL_AWAY), and skips hashcash validation on +H channels (servers and services
+use NOTICE).
+
+**ISUPPORT:** The server advertises `PREFIX=(ov)@+` and
+`CHANMODES=,,H,mnst` in RPL_ISUPPORT (005).
 
 ### Per-Channel Hashcash (Anti-Spam)
 
@@ -2677,17 +2694,19 @@ guess is borne by the server (bcrypt), not the client.
 - [x] **Hashcash proof-of-work** for session creation (abuse prevention)
 - [x] **Client output queue pruning** — delete old client output queue entries per `QUEUE_MAX_AGE`
 - [x] **Message rotation** — prune messages older than `MESSAGE_MAX_AGE`
-- [ ] **Channel modes** — enforce `+i`, `+m`, `+s`, `+t`, `+n`
-- [ ] **User channel modes** — `+o` (operator), `+v` (voice)
-- [x] **MODE command** — query channel and user modes (set not yet implemented)
-- [x] **NAMES command** — query channel member list
+- [x] **Channel modes** — enforce `+m` (moderated), `+t` (topic lock), `+n` (no external)
+- [ ] **Channel modes (tier 2)** — enforce `+i` (invite-only), `+s` (secret), `+b` (ban), `+k` (key), `+l` (limit)
+- [x] **User channel modes** — `+o` (operator), `+v` (voice) with NAMES prefixes
+- [x] **KICK command** — operator-only channel kick with broadcast
+- [x] **MODE command** — query and set channel/user modes
+- [x] **NAMES command** — query channel member list with @/+ prefixes
 - [x] **LIST command** — list all channels with member counts
 - [x] **WHOIS command** — query user information and channel membership
 - [x] **WHO command** — query channel user list
 - [x] **LUSERS command** — query server statistics
 - [x] **Connection registration numerics** — 001-005 sent on session creation
 - [x] **LUSERS numerics** — 251/252/254/255 sent on connect and via /LUSERS
-- [ ] **KICK command** — remove users from channels
+- [x] **KICK command** — remove users from channels (operator-only)
 - [x] **Numeric replies** — send IRC numeric codes via the message queue
   (001-005 welcome, 251-255 LUSERS, 311-319 WHOIS, 322-329 LIST/MODE,
   331-332 TOPIC, 352-353 WHO/NAMES, 366, 372-376 MOTD, 401-461 errors)

internal/db/queries.go

@@ -72,11 +72,13 @@ type ChannelInfo struct {
 
 // MemberInfo represents a channel member.
 type MemberInfo struct {
-	ID       int64     `json:"id"`
-	Nick     string    `json:"nick"`
-	Username string    `json:"username"`
-	Hostname string    `json:"hostname"`
-	LastSeen time.Time `json:"lastSeen"`
+	ID         int64     `json:"id"`
+	Nick       string    `json:"nick"`
+	Username   string    `json:"username"`
+	Hostname   string    `json:"hostname"`
+	IsOperator bool      `json:"isOperator"`
+	IsVoiced   bool      `json:"isVoiced"`
+	LastSeen   time.Time `json:"lastSeen"`
 }
 
 // Hostmask returns the IRC hostmask in
@@ -436,6 +438,237 @@ func (database *Database) JoinChannel(
 	return nil
 }
 
+// JoinChannelAsOperator adds a session to a channel with
+// operator status. Used when a user creates a new channel.
+func (database *Database) JoinChannelAsOperator(
+	ctx context.Context,
+	channelID, sessionID int64,
+) error {
+	_, err := database.conn.ExecContext(ctx,
+		`INSERT OR IGNORE INTO channel_members
+		 (channel_id, session_id, is_operator, joined_at)
+		 VALUES (?, ?, 1, ?)`,
+		channelID, sessionID, time.Now())
+	if err != nil {
+		return fmt.Errorf(
+			"join channel as operator: %w", err,
+		)
+	}
+
+	return nil
+}
+
+// CountChannelMembers returns the number of members in
+// a channel.
+func (database *Database) CountChannelMembers(
+	ctx context.Context,
+	channelID int64,
+) (int64, error) {
+	var count int64
+
+	err := database.conn.QueryRowContext(ctx,
+		`SELECT COUNT(*) FROM channel_members
+		 WHERE channel_id = ?`,
+		channelID,
+	).Scan(&count)
+	if err != nil {
+		return 0, fmt.Errorf(
+			"count channel members: %w", err,
+		)
+	}
+
+	return count, nil
+}
+
+// IsChannelOperator checks if a session has operator
+// status in a channel.
+func (database *Database) IsChannelOperator(
+	ctx context.Context,
+	channelID, sessionID int64,
+) (bool, error) {
+	var isOp int
+
+	err := database.conn.QueryRowContext(ctx,
+		`SELECT is_operator FROM channel_members
+		 WHERE channel_id = ? AND session_id = ?`,
+		channelID, sessionID,
+	).Scan(&isOp)
+	if err != nil {
+		return false, fmt.Errorf(
+			"check channel operator: %w", err,
+		)
+	}
+
+	return isOp != 0, nil
+}
+
+// IsChannelVoiced checks if a session has voice status
+// in a channel.
+func (database *Database) IsChannelVoiced(
+	ctx context.Context,
+	channelID, sessionID int64,
+) (bool, error) {
+	var isVoiced int
+
+	err := database.conn.QueryRowContext(ctx,
+		`SELECT is_voiced FROM channel_members
+		 WHERE channel_id = ? AND session_id = ?`,
+		channelID, sessionID,
+	).Scan(&isVoiced)
+	if err != nil {
+		return false, fmt.Errorf(
+			"check channel voiced: %w", err,
+		)
+	}
+
+	return isVoiced != 0, nil
+}
+
+// SetChannelMemberOperator sets or clears operator status
+// for a session in a channel.
+func (database *Database) SetChannelMemberOperator(
+	ctx context.Context,
+	channelID, sessionID int64,
+	isOp bool,
+) error {
+	val := 0
+	if isOp {
+		val = 1
+	}
+
+	_, err := database.conn.ExecContext(ctx,
+		`UPDATE channel_members
+		 SET is_operator = ?
+		 WHERE channel_id = ? AND session_id = ?`,
+		val, channelID, sessionID)
+	if err != nil {
+		return fmt.Errorf(
+			"set channel member operator: %w", err,
+		)
+	}
+
+	return nil
+}
+
+// SetChannelMemberVoiced sets or clears voice status
+// for a session in a channel.
+func (database *Database) SetChannelMemberVoiced(
+	ctx context.Context,
+	channelID, sessionID int64,
+	isVoiced bool,
+) error {
+	val := 0
+	if isVoiced {
+		val = 1
+	}
+
+	_, err := database.conn.ExecContext(ctx,
+		`UPDATE channel_members
+		 SET is_voiced = ?
+		 WHERE channel_id = ? AND session_id = ?`,
+		val, channelID, sessionID)
+	if err != nil {
+		return fmt.Errorf(
+			"set channel member voiced: %w", err,
+		)
+	}
+
+	return nil
+}
+
+// IsChannelModerated returns whether a channel has +m set.
+func (database *Database) IsChannelModerated(
+	ctx context.Context,
+	channelID int64,
+) (bool, error) {
+	var isMod int
+
+	err := database.conn.QueryRowContext(ctx,
+		`SELECT is_moderated FROM channels
+		 WHERE id = ?`,
+		channelID,
+	).Scan(&isMod)
+	if err != nil {
+		return false, fmt.Errorf(
+			"check channel moderated: %w", err,
+		)
+	}
+
+	return isMod != 0, nil
+}
+
+// SetChannelModerated sets or clears +m on a channel.
+func (database *Database) SetChannelModerated(
+	ctx context.Context,
+	channelID int64,
+	moderated bool,
+) error {
+	val := 0
+	if moderated {
+		val = 1
+	}
+
+	_, err := database.conn.ExecContext(ctx,
+		`UPDATE channels
+		 SET is_moderated = ?, updated_at = ?
+		 WHERE id = ?`,
+		val, time.Now(), channelID)
+	if err != nil {
+		return fmt.Errorf(
+			"set channel moderated: %w", err,
+		)
+	}
+
+	return nil
+}
+
+// IsChannelTopicLocked returns whether a channel has
+// +t set.
+func (database *Database) IsChannelTopicLocked(
+	ctx context.Context,
+	channelID int64,
+) (bool, error) {
+	var isLocked int
+
+	err := database.conn.QueryRowContext(ctx,
+		`SELECT is_topic_locked FROM channels
+		 WHERE id = ?`,
+		channelID,
+	).Scan(&isLocked)
+	if err != nil {
+		return false, fmt.Errorf(
+			"check channel topic locked: %w", err,
+		)
+	}
+
+	return isLocked != 0, nil
+}
+
+// SetChannelTopicLocked sets or clears +t on a channel.
+func (database *Database) SetChannelTopicLocked(
+	ctx context.Context,
+	channelID int64,
+	locked bool,
+) error {
+	val := 0
+	if locked {
+		val = 1
+	}
+
+	_, err := database.conn.ExecContext(ctx,
+		`UPDATE channels
+		 SET is_topic_locked = ?, updated_at = ?
+		 WHERE id = ?`,
+		val, time.Now(), channelID)
+	if err != nil {
+		return fmt.Errorf(
+			"set channel topic locked: %w", err,
+		)
+	}
+
+	return nil
+}
+
 // PartChannel removes a session from a channel.
 func (database *Database) PartChannel(
 	ctx context.Context,
@@ -547,7 +780,8 @@ func (database *Database) ChannelMembers(
 ) ([]MemberInfo, error) {
 	rows, err := database.conn.QueryContext(ctx,
 		`SELECT s.id, s.nick, s.username,
-		   s.hostname, s.last_seen
+		   s.hostname, cm.is_operator, cm.is_voiced,
+		   s.last_seen
 		 FROM sessions s
 		 INNER JOIN channel_members cm
 		   ON cm.session_id = s.id
@@ -564,11 +798,16 @@ func (database *Database) ChannelMembers(
 	var members []MemberInfo
 
 	for rows.Next() {
-		var member MemberInfo
+		var (
+			member MemberInfo
+			isOp   int
+			isV    int
+		)
 
 		err = rows.Scan(
 			&member.ID, &member.Nick,
 			&member.Username, &member.Hostname,
+			&isOp, &isV,
 			&member.LastSeen,
 		)
 		if err != nil {
@@ -577,6 +816,9 @@ func (database *Database) ChannelMembers(
 			)
 		}
 
+		member.IsOperator = isOp != 0
+		member.IsVoiced = isV != 0
+
 		members = append(members, member)
 	}
 

internal/db/schema/001_initial.sql

@@ -40,6 +40,8 @@ CREATE TABLE IF NOT EXISTS channels (
     topic_set_by TEXT NOT NULL DEFAULT '',
     topic_set_at DATETIME,
     hashcash_bits INTEGER NOT NULL DEFAULT 0,
+    is_moderated INTEGER NOT NULL DEFAULT 0,
+    is_topic_locked INTEGER NOT NULL DEFAULT 1,
     created_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     updated_at DATETIME DEFAULT CURRENT_TIMESTAMP
 );
@@ -49,6 +51,8 @@ CREATE TABLE IF NOT EXISTS channel_members (
     id INTEGER PRIMARY KEY AUTOINCREMENT,
     channel_id INTEGER NOT NULL REFERENCES channels(id) ON DELETE CASCADE,
     session_id INTEGER NOT NULL REFERENCES sessions(id) ON DELETE CASCADE,
+    is_operator INTEGER NOT NULL DEFAULT 0,
+    is_voiced INTEGER NOT NULL DEFAULT 0,
     joined_at DATETIME DEFAULT CURRENT_TIMESTAMP,
     UNIQUE(channel_id, session_id)
 );

internal/handlers/api.go

@@ -218,11 +218,10 @@ func (hdlr *Handlers) fanOutSilent(
 	request *http.Request,
 	command, from, target string,
 	body json.RawMessage,
-	meta json.RawMessage,
 	sessionIDs []int64,
 ) error {
 	_, err := hdlr.fanOut(
-		request, command, from, target, body, meta, sessionIDs,
+		request, command, from, target, body, nil, sessionIDs,
 	)
 
 	return err
@@ -458,7 +457,8 @@ func (hdlr *Handlers) deliverWelcome(
 		[]string{
 			"CHANTYPES=#",
 			"NICKLEN=32",
-			"CHANMODES=,,H," + "imnst",
+			"PREFIX=(ov)@+",
+			"CHANMODES=,,H,mnst",
 			"NETWORK=neoirc",
 			"CASEMAPPING=ascii",
 		},
@@ -1051,6 +1051,12 @@ func (hdlr *Handlers) dispatchCommand(
 			sessionID, clientID, nick,
 			target, body, bodyLines,
 		)
+	case irc.CmdKick:
+		hdlr.handleKick(
+			writer, request,
+			sessionID, clientID, nick,
+			target, body, bodyLines,
+		)
 	case irc.CmdQuit:
 		hdlr.handleQuit(
 			writer, request, sessionID, nick, body,
@@ -1214,8 +1220,10 @@ func (hdlr *Handlers) handleChannelMsg(
 	body json.RawMessage,
 	meta json.RawMessage,
 ) {
+	ctx := request.Context()
+
 	chID, err := hdlr.params.Database.GetChannelByName(
-		request.Context(), target,
+		ctx, target,
 	)
 	if err != nil {
 		hdlr.respondIRCError(
@@ -1228,7 +1236,7 @@ func (hdlr *Handlers) handleChannelMsg(
 	}
 
 	isMember, err := hdlr.params.Database.IsChannelMember(
-		request.Context(), chID, sessionID,
+		ctx, chID, sessionID,
 	)
 	if err != nil {
 		hdlr.log.Error(
@@ -1253,20 +1261,73 @@ func (hdlr *Handlers) handleChannelMsg(
 		return
 	}
 
-	hashcashErr := hdlr.validateChannelHashcash(
-		request, clientID, sessionID,
-		writer, nick, target, body, meta, chID,
-	)
-	if hashcashErr != nil {
+	// Enforce +m (moderated): only +o and +v can send.
+	if !hdlr.checkModeratedSend(
+		writer, request,
+		sessionID, clientID, nick, target, chID,
+	) {
 		return
 	}
 
+	// NOTICE skips hashcash validation on +H channels
+	// (servers and services use NOTICE).
+	isNotice := command == irc.CmdNotice
+
+	if !isNotice {
+		hashcashErr := hdlr.validateChannelHashcash(
+			request, clientID, sessionID,
+			writer, nick, target, body, meta, chID,
+		)
+		if hashcashErr != nil {
+			return
+		}
+	}
+
 	hdlr.sendChannelMsg(
 		writer, request, command, nick, target,
 		body, meta, chID,
 	)
 }
 
+// checkModeratedSend checks if a user can send to a
+// moderated channel. Returns true if sending is allowed.
+func (hdlr *Handlers) checkModeratedSend(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, target string,
+	chID int64,
+) bool {
+	ctx := request.Context()
+
+	isModerated, err := hdlr.params.Database.
+		IsChannelModerated(ctx, chID)
+	if err != nil || !isModerated {
+		return true
+	}
+
+	isOp, opErr := hdlr.params.Database.
+		IsChannelOperator(ctx, chID, sessionID)
+	if opErr == nil && isOp {
+		return true
+	}
+
+	isVoiced, vErr := hdlr.params.Database.
+		IsChannelVoiced(ctx, chID, sessionID)
+	if vErr == nil && isVoiced {
+		return true
+	}
+
+	hdlr.respondIRCError(
+		writer, request, clientID, sessionID,
+		irc.ErrCannotSendToChan, nick,
+		[]string{target},
+		"Cannot send to channel (+m)",
+	)
+
+	return false
+}
+
 // validateChannelHashcash checks whether the channel
 // requires hashcash proof-of-work for messages and
 // validates the stamp from the message meta field.
@@ -1508,17 +1569,20 @@ func (hdlr *Handlers) handleDirectMsg(
 		return
 	}
 
-	// If the target is away, send RPL_AWAY to the sender.
-	awayMsg, awayErr := hdlr.params.Database.GetAway(
-		request.Context(), targetSID,
-	)
-	if awayErr == nil && awayMsg != "" {
-		hdlr.enqueueNumeric(
-			request.Context(), clientID,
-			irc.RplAway, nick,
-			[]string{target}, awayMsg,
+	// Per RFC 2812: NOTICE must NOT trigger auto-replies
+	// including RPL_AWAY.
+	if command != irc.CmdNotice {
+		awayMsg, awayErr := hdlr.params.Database.GetAway(
+			request.Context(), targetSID,
 		)
-		hdlr.broker.Notify(sessionID)
+		if awayErr == nil && awayMsg != "" {
+			hdlr.enqueueNumeric(
+				request.Context(), clientID,
+				irc.RplAway, nick,
+				[]string{target}, awayMsg,
+			)
+			hdlr.broker.Notify(sessionID)
+		}
 	}
 
 	hdlr.respondJSON(writer, request,
@@ -1569,8 +1633,10 @@ func (hdlr *Handlers) executeJoin(
 	sessionID, clientID int64,
 	nick, channel string,
 ) {
+	ctx := request.Context()
+
 	chID, err := hdlr.params.Database.GetOrCreateChannel(
-		request.Context(), channel,
+		ctx, channel,
 	)
 	if err != nil {
 		hdlr.log.Error(
@@ -1585,9 +1651,28 @@ func (hdlr *Handlers) executeJoin(
 		return
 	}
 
-	err = hdlr.params.Database.JoinChannel(
-		request.Context(), chID, sessionID,
-	)
+	// Check if channel is empty before joining — first
+	// joiner becomes operator.
+	memberCount, countErr := hdlr.params.Database.
+		CountChannelMembers(ctx, chID)
+	if countErr != nil {
+		hdlr.log.Error(
+			"count members failed", "error", countErr,
+		)
+	}
+
+	isCreator := countErr == nil && memberCount == 0
+
+	if isCreator {
+		err = hdlr.params.Database.JoinChannelAsOperator(
+			ctx, chID, sessionID,
+		)
+	} else {
+		err = hdlr.params.Database.JoinChannel(
+			ctx, chID, sessionID,
+		)
+	}
+
 	if err != nil {
 		hdlr.log.Error(
 			"join channel failed", "error", err,
@@ -1602,11 +1687,11 @@ func (hdlr *Handlers) executeJoin(
 	}
 
 	memberIDs, _ := hdlr.params.Database.GetChannelMemberIDs(
-		request.Context(), chID,
+		ctx, chID,
 	)
 
 	_ = hdlr.fanOutSilent(
-		request, irc.CmdJoin, nick, channel, nil, nil, memberIDs,
+		request, irc.CmdJoin, nick, channel, nil, memberIDs,
 	)
 
 	hdlr.deliverJoinNumerics(
@@ -1696,6 +1781,21 @@ func (hdlr *Handlers) deliverTopicNumerics(
 	}
 }
 
+// memberPrefix returns the IRC prefix character for a
+// channel member: "@" for operators, "+" for voiced, or
+// "" for regular members.
+func memberPrefix(mem *db.MemberInfo) string {
+	if mem.IsOperator {
+		return "@"
+	}
+
+	if mem.IsVoiced {
+		return "+"
+	}
+
+	return ""
+}
+
 // deliverNamesNumerics sends RPL_NAMREPLY and
 // RPL_ENDOFNAMES for a channel.
 func (hdlr *Handlers) deliverNamesNumerics(
@@ -1711,8 +1811,12 @@ func (hdlr *Handlers) deliverNamesNumerics(
 	if memErr == nil && len(members) > 0 {
 		entries := make([]string, 0, len(members))
 
-		for _, mem := range members {
-			entries = append(entries, mem.Hostmask())
+		for idx := range members {
+			prefix := memberPrefix(&members[idx])
+			entries = append(
+				entries,
+				prefix+members[idx].Hostmask(),
+			)
 		}
 
 		hdlr.enqueueNumeric(
@@ -1776,7 +1880,7 @@ func (hdlr *Handlers) handlePart(
 	)
 
 	_ = hdlr.fanOutSilent(
-		request, irc.CmdPart, nick, channel, body, nil, memberIDs,
+		request, irc.CmdPart, nick, channel, body, memberIDs,
 	)
 
 	err = hdlr.params.Database.PartChannel(
@@ -2035,6 +2139,27 @@ func (hdlr *Handlers) executeTopic(
 	body json.RawMessage,
 	chID int64,
 ) {
+	ctx := request.Context()
+
+	// Enforce +t: only operators can change topic when
+	// topic lock is active.
+	isLocked, lockErr := hdlr.params.Database.
+		IsChannelTopicLocked(ctx, chID)
+	if lockErr == nil && isLocked {
+		isOp, opErr := hdlr.params.Database.
+			IsChannelOperator(ctx, chID, sessionID)
+		if opErr != nil || !isOp {
+			hdlr.respondIRCError(
+				writer, request, clientID, sessionID,
+				irc.ErrChanOpPrivsNeeded, nick,
+				[]string{channel},
+				"You're not channel operator",
+			)
+
+			return
+		}
+	}
+
 	setErr := hdlr.params.Database.SetTopicMeta(
 		request.Context(), channel, topic, nick,
 	)
@@ -2056,7 +2181,7 @@ func (hdlr *Handlers) executeTopic(
 	)
 
 	_ = hdlr.fanOutSilent(
-		request, irc.CmdTopic, nick, channel, body, nil, memberIDs,
+		request, irc.CmdTopic, nick, channel, body, memberIDs,
 	)
 
 	hdlr.enqueueNumeric(
@@ -2267,9 +2392,39 @@ func (hdlr *Handlers) handleChannelMode(
 	)
 }
 
+// buildChannelModeString constructs the current mode
+// string for a channel, including +n (always on), +t, +m,
+// and +H with its parameter.
+func (hdlr *Handlers) buildChannelModeString(
+	ctx context.Context,
+	chID int64,
+) string {
+	modes := "+n"
+
+	isTopicLocked, tlErr := hdlr.params.Database.
+		IsChannelTopicLocked(ctx, chID)
+	if tlErr == nil && isTopicLocked {
+		modes += "t"
+	}
+
+	isModerated, modErr := hdlr.params.Database.
+		IsChannelModerated(ctx, chID)
+	if modErr == nil && isModerated {
+		modes += "m"
+	}
+
+	bits, bitsErr := hdlr.params.Database.
+		GetChannelHashcashBits(ctx, chID)
+	if bitsErr == nil && bits > 0 {
+		modes += fmt.Sprintf("H %d", bits)
+	}
+
+	return modes
+}
+
 // queryChannelMode sends RPL_CHANNELMODEIS and
-// RPL_CREATIONTIME for a channel. Includes +H if
-// the channel has a hashcash requirement.
+// RPL_CREATIONTIME for a channel. Includes +t, +m, +H
+// as appropriate.
 func (hdlr *Handlers) queryChannelMode(
 	writer http.ResponseWriter,
 	request *http.Request,
@@ -2279,13 +2434,7 @@ func (hdlr *Handlers) queryChannelMode(
 ) {
 	ctx := request.Context()
 
-	modeStr := "+n"
-
-	bits, bitsErr := hdlr.params.Database.
-		GetChannelHashcashBits(ctx, chID)
-	if bitsErr == nil && bits > 0 {
-		modeStr = fmt.Sprintf("+nH %d", bits)
-	}
+	modeStr := hdlr.buildChannelModeString(ctx, chID)
 
 	// 324 RPL_CHANNELMODEIS
 	hdlr.enqueueNumeric(
@@ -2315,8 +2464,35 @@ func (hdlr *Handlers) queryChannelMode(
 		http.StatusOK)
 }
 
+// requireChannelOp checks that the session has +o in the
+// channel. If not, it sends ERR_CHANOPRIVSNEEDED and
+// returns false.
+func (hdlr *Handlers) requireChannelOp(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, channel string,
+	chID int64,
+) bool {
+	isOp, err := hdlr.params.Database.IsChannelOperator(
+		request.Context(), chID, sessionID,
+	)
+	if err != nil || !isOp {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrChanOpPrivsNeeded, nick,
+			[]string{channel},
+			"You're not channel operator",
+		)
+
+		return false
+	}
+
+	return true
+}
+
 // applyChannelMode handles setting channel modes.
-// Currently supports +H/-H for hashcash bits.
+// Supports +o/-o, +v/-v, +m/-m, +t/-t, +H/-H.
 func (hdlr *Handlers) applyChannelMode(
 	writer http.ResponseWriter,
 	request *http.Request,
@@ -2329,6 +2505,42 @@ func (hdlr *Handlers) applyChannelMode(
 	modeStr := modeArgs[0]
 
 	switch modeStr {
+	case "+o", "-o":
+		hdlr.applyUserMode(
+			writer, request,
+			sessionID, clientID, nick,
+			channel, chID, modeArgs, true,
+		)
+	case "+v", "-v":
+		hdlr.applyUserMode(
+			writer, request,
+			sessionID, clientID, nick,
+			channel, chID, modeArgs, false,
+		)
+	case "+m":
+		hdlr.setChannelFlag(
+			writer, request,
+			sessionID, clientID, nick,
+			channel, chID, "m", true,
+		)
+	case "-m":
+		hdlr.setChannelFlag(
+			writer, request,
+			sessionID, clientID, nick,
+			channel, chID, "m", false,
+		)
+	case "+t":
+		hdlr.setChannelFlag(
+			writer, request,
+			sessionID, clientID, nick,
+			channel, chID, "t", true,
+		)
+	case "-t":
+		hdlr.setChannelFlag(
+			writer, request,
+			sessionID, clientID, nick,
+			channel, chID, "t", false,
+		)
 	case "+H":
 		hdlr.setHashcashMode(
 			writer, request,
@@ -2355,6 +2567,224 @@ func (hdlr *Handlers) applyChannelMode(
 	}
 }
 
+// resolveUserModeTarget validates a user-mode change
+// target and returns the target session ID if valid.
+// Returns -1 on error (error response already sent).
+func (hdlr *Handlers) resolveUserModeTarget(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, channel string,
+	chID int64,
+	modeArgs []string,
+) (int64, string, bool) {
+	if !hdlr.requireChannelOp(
+		writer, request,
+		sessionID, clientID, nick, channel, chID,
+	) {
+		return -1, "", false
+	}
+
+	if len(modeArgs) < 2 { //nolint:mnd // mode + nick
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrNeedMoreParams, nick,
+			[]string{irc.CmdMode},
+			"Not enough parameters",
+		)
+
+		return -1, "", false
+	}
+
+	ctx := request.Context()
+	targetNick := modeArgs[1]
+
+	targetSID, err := hdlr.params.Database.
+		GetSessionByNick(ctx, targetNick)
+	if err != nil {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrNoSuchNick, nick,
+			[]string{targetNick},
+			"No such nick/channel",
+		)
+
+		return -1, "", false
+	}
+
+	isMember, memErr := hdlr.params.Database.
+		IsChannelMember(ctx, chID, targetSID)
+	if memErr != nil || !isMember {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrUserNotInChannel, nick,
+			[]string{targetNick, channel},
+			"They aren't on that channel",
+		)
+
+		return -1, "", false
+	}
+
+	return targetSID, targetNick, true
+}
+
+// applyUserMode handles +o/-o and +v/-v mode changes.
+// isOperMode=true for +o/-o, false for +v/-v.
+func (hdlr *Handlers) applyUserMode(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, channel string,
+	chID int64,
+	modeArgs []string,
+	isOperMode bool,
+) {
+	ctx := request.Context()
+
+	targetSID, targetNick, ok := hdlr.resolveUserModeTarget(
+		writer, request,
+		sessionID, clientID, nick,
+		channel, chID, modeArgs,
+	)
+	if !ok {
+		return
+	}
+
+	setting := strings.HasPrefix(modeArgs[0], "+")
+
+	var err error
+	if isOperMode {
+		err = hdlr.params.Database.SetChannelMemberOperator(
+			ctx, chID, targetSID, setting,
+		)
+	} else {
+		err = hdlr.params.Database.SetChannelMemberVoiced(
+			ctx, chID, targetSID, setting,
+		)
+	}
+
+	if err != nil {
+		hdlr.log.Error(
+			"set user mode failed", "error", err,
+		)
+		hdlr.respondError(
+			writer, request,
+			"internal error",
+			http.StatusInternalServerError,
+		)
+
+		return
+	}
+
+	hdlr.broadcastUserModeChange(
+		request, nick, channel, chID,
+		modeArgs[0], targetNick,
+	)
+
+	hdlr.respondJSON(writer, request,
+		map[string]string{"status": "ok"},
+		http.StatusOK)
+}
+
+// broadcastUserModeChange fans out a user-mode change
+// to all channel members.
+func (hdlr *Handlers) broadcastUserModeChange(
+	request *http.Request,
+	nick, channel string,
+	chID int64,
+	modeStr, targetNick string,
+) {
+	ctx := request.Context()
+
+	memberIDs, _ := hdlr.params.Database.
+		GetChannelMemberIDs(ctx, chID)
+
+	modeBody, err := json.Marshal(
+		[]string{modeStr, targetNick},
+	)
+	if err != nil {
+		return
+	}
+
+	_ = hdlr.fanOutSilent(
+		request, irc.CmdMode, nick, channel,
+		json.RawMessage(modeBody), memberIDs,
+	)
+}
+
+// setChannelFlag handles +m/-m and +t/-t mode changes.
+func (hdlr *Handlers) setChannelFlag(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, channel string,
+	chID int64,
+	flag string,
+	setting bool,
+) {
+	ctx := request.Context()
+
+	if !hdlr.requireChannelOp(
+		writer, request,
+		sessionID, clientID, nick, channel, chID,
+	) {
+		return
+	}
+
+	var err error
+
+	switch flag {
+	case "m":
+		err = hdlr.params.Database.SetChannelModerated(
+			ctx, chID, setting,
+		)
+	case "t":
+		err = hdlr.params.Database.SetChannelTopicLocked(
+			ctx, chID, setting,
+		)
+	}
+
+	if err != nil {
+		hdlr.log.Error(
+			"set channel flag failed", "error", err,
+		)
+		hdlr.respondError(
+			writer, request,
+			"internal error",
+			http.StatusInternalServerError,
+		)
+
+		return
+	}
+
+	// Broadcast the MODE change.
+	modeStr := "+" + flag
+	if !setting {
+		modeStr = "-" + flag
+	}
+
+	memberIDs, _ := hdlr.params.Database.
+		GetChannelMemberIDs(ctx, chID)
+
+	modeBody, mErr := json.Marshal([]string{modeStr})
+	if mErr != nil {
+		hdlr.log.Error(
+			"marshal mode body", "error", mErr,
+		)
+
+		return
+	}
+
+	_ = hdlr.fanOutSilent(
+		request, irc.CmdMode, nick, channel,
+		json.RawMessage(modeBody), memberIDs,
+	)
+
+	hdlr.respondJSON(writer, request,
+		map[string]string{"status": "ok"},
+		http.StatusOK)
+}
+
 const (
 	// minHashcashBits is the minimum allowed hashcash
 	// difficulty for channels.
@@ -2416,12 +2846,11 @@ func (hdlr *Handlers) setHashcashMode(
 		return
 	}
 
+	modeStr := hdlr.buildChannelModeString(ctx, chID)
+
 	hdlr.enqueueNumeric(
 		ctx, clientID, irc.RplChannelModeIs, nick,
-		[]string{
-			channel,
-			fmt.Sprintf("+H %d", bits),
-		}, "",
+		[]string{channel, modeStr}, "",
 	)
 	hdlr.broker.Notify(sessionID)
 	hdlr.respondJSON(writer, request,
@@ -2455,9 +2884,11 @@ func (hdlr *Handlers) clearHashcashMode(
 		return
 	}
 
+	modeStr := hdlr.buildChannelModeString(ctx, chID)
+
 	hdlr.enqueueNumeric(
 		ctx, clientID, irc.RplChannelModeIs, nick,
-		[]string{channel, "+n"}, "",
+		[]string{channel, modeStr}, "",
 	)
 	hdlr.broker.Notify(sessionID)
 	hdlr.respondJSON(writer, request,
@@ -2508,8 +2939,12 @@ func (hdlr *Handlers) handleNames(
 	if memErr == nil && len(members) > 0 {
 		entries := make([]string, 0, len(members))
 
-		for _, mem := range members {
-			entries = append(entries, mem.Hostmask())
+		for idx := range members {
+			prefix := memberPrefix(&members[idx])
+			entries = append(
+				entries,
+				prefix+members[idx].Hostmask(),
+			)
 		}
 
 		hdlr.enqueueNumeric(
@@ -3326,6 +3761,222 @@ func (hdlr *Handlers) handleAway(
 		http.StatusOK)
 }
 
+// handleKick handles the KICK command.
+func (hdlr *Handlers) handleKick(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, target string,
+	body json.RawMessage,
+	bodyLines func() []string,
+) {
+	if target == "" {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrNeedMoreParams, nick,
+			[]string{irc.CmdKick},
+			"Not enough parameters",
+		)
+
+		return
+	}
+
+	channel := target
+	if !strings.HasPrefix(channel, "#") {
+		channel = "#" + channel
+	}
+
+	lines := bodyLines()
+	if len(lines) == 0 {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrNeedMoreParams, nick,
+			[]string{irc.CmdKick},
+			"Not enough parameters",
+		)
+
+		return
+	}
+
+	targetNick := lines[0]
+
+	reason := nick
+	if len(lines) > 1 {
+		reason = lines[1]
+	}
+
+	hdlr.executeKick(
+		writer, request,
+		sessionID, clientID, nick,
+		channel, targetNick, reason, body,
+	)
+}
+
+func (hdlr *Handlers) executeKick(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, channel, targetNick, reason string,
+	_ json.RawMessage,
+) {
+	ctx := request.Context()
+
+	chID, targetSID, ok := hdlr.validateKick(
+		writer, request,
+		sessionID, clientID, nick,
+		channel, targetNick,
+	)
+	if !ok {
+		return
+	}
+
+	if !hdlr.broadcastKick(
+		writer, request,
+		nick, channel, targetNick, reason, chID,
+	) {
+		return
+	}
+
+	// Remove the kicked user from the channel.
+	_ = hdlr.params.Database.PartChannel(
+		ctx, chID, targetSID,
+	)
+
+	// Clean up empty channel.
+	_ = hdlr.params.Database.DeleteChannelIfEmpty(
+		ctx, chID,
+	)
+
+	hdlr.respondJSON(writer, request,
+		map[string]string{"status": "ok"},
+		http.StatusOK)
+}
+
+// validateKick checks the channel exists, the kicker is
+// an operator, and the target is in the channel.
+func (hdlr *Handlers) validateKick(
+	writer http.ResponseWriter,
+	request *http.Request,
+	sessionID, clientID int64,
+	nick, channel, targetNick string,
+) (int64, int64, bool) {
+	ctx := request.Context()
+
+	chID, err := hdlr.params.Database.GetChannelByName(
+		ctx, channel,
+	)
+	if err != nil {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrNoSuchChannel, nick,
+			[]string{channel},
+			"No such channel",
+		)
+
+		return 0, 0, false
+	}
+
+	if !hdlr.requireChannelOp(
+		writer, request,
+		sessionID, clientID, nick, channel, chID,
+	) {
+		return 0, 0, false
+	}
+
+	targetSID, err := hdlr.params.Database.
+		GetSessionByNick(ctx, targetNick)
+	if err != nil {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrNoSuchNick, nick,
+			[]string{targetNick},
+			"No such nick/channel",
+		)
+
+		return 0, 0, false
+	}
+
+	isMember, memErr := hdlr.params.Database.
+		IsChannelMember(ctx, chID, targetSID)
+	if memErr != nil || !isMember {
+		hdlr.respondIRCError(
+			writer, request, clientID, sessionID,
+			irc.ErrUserNotInChannel, nick,
+			[]string{targetNick, channel},
+			"They aren't on that channel",
+		)
+
+		return 0, 0, false
+	}
+
+	return chID, targetSID, true
+}
+
+// broadcastKick inserts a KICK message and fans it out
+// to all channel members.
+func (hdlr *Handlers) broadcastKick(
+	writer http.ResponseWriter,
+	request *http.Request,
+	nick, channel, targetNick, reason string,
+	chID int64,
+) bool {
+	ctx := request.Context()
+
+	memberIDs, _ := hdlr.params.Database.
+		GetChannelMemberIDs(ctx, chID)
+
+	kickBody, bErr := json.Marshal([]string{reason})
+	if bErr != nil {
+		hdlr.log.Error("marshal kick body", "error", bErr)
+
+		return false
+	}
+
+	kickParams, pErr := json.Marshal(
+		[]string{targetNick},
+	)
+	if pErr != nil {
+		hdlr.log.Error(
+			"marshal kick params", "error", pErr,
+		)
+
+		return false
+	}
+
+	dbID, _, insertErr := hdlr.params.Database.
+		InsertMessage(
+			ctx, irc.CmdKick, nick, channel,
+			json.RawMessage(kickParams),
+			json.RawMessage(kickBody), nil,
+		)
+	if insertErr != nil {
+		hdlr.log.Error(
+			"insert kick message", "error", insertErr,
+		)
+		hdlr.respondError(
+			writer, request,
+			"internal error",
+			http.StatusInternalServerError,
+		)
+
+		return false
+	}
+
+	for _, sid := range memberIDs {
+		enqErr := hdlr.params.Database.EnqueueToSession(
+			ctx, sid, dbID,
+		)
+		if enqErr != nil {
+			hdlr.log.Error("enqueue kick failed",
+				"error", enqErr, "session_id", sid)
+		}
+
+		hdlr.broker.Notify(sid)
+	}
+
+	return true
+}
+
 // deliverWhoisIdle sends RPL_WHOISIDLE (317) with idle
 // time and signon time.
 func (hdlr *Handlers) deliverWhoisIdle(

pkg/irc/commands.go

@@ -4,6 +4,7 @@ package irc
 const (
 	CmdAway    = "AWAY"
 	CmdJoin    = "JOIN"
+	CmdKick    = "KICK"
 	CmdList    = "LIST"
 	CmdLusers  = "LUSERS"
 	CmdMode    = "MODE"