implement NS RENAME

Fixes #1380

irc/accounts.go

@@ -1406,6 +1406,36 @@ func (am *AccountManager) ListSuspended() (result []AccountSuspension) {
 	return
 }
 
+// renames an account (within very restrictive limits); see #1380
+func (am *AccountManager) Rename(oldName, newName string) (err error) {
+	accountData, err := am.LoadAccount(oldName)
+	if err != nil {
+		return
+	}
+	newCfName, err := CasefoldName(newName)
+	if err != nil {
+		return errNicknameInvalid
+	}
+	if newCfName != accountData.NameCasefolded {
+		return errInvalidAccountRename
+	}
+	key := fmt.Sprintf(keyAccountName, accountData.NameCasefolded)
+	err = am.server.store.Update(func(tx *buntdb.Tx) error {
+		tx.Set(key, newName, nil)
+		return nil
+	})
+	if err != nil {
+		return err
+	}
+
+	am.RLock()
+	defer am.RUnlock()
+	for _, client := range am.accountToClients[accountData.NameCasefolded] {
+		client.setAccountName(newName)
+	}
+	return nil
+}
+
 func (am *AccountManager) Unregister(account string, erase bool) error {
 	config := am.server.Config()
 	casefoldedAccount, err := CasefoldName(account)

irc/errors.go

@@ -73,6 +73,7 @@ var (
 	errInviteOnly                     = errors.New("Cannot join invite-only channel without an invite")
 	errRegisteredOnly                 = errors.New("Cannot join registered-only channel without an account")
 	errValidEmailRequired             = errors.New("A valid email address is required for account registration")
+	errInvalidAccountRename           = errors.New("Account renames can only change the casefolding of the account name")
 )
 
 // String Errors

irc/getters.go

@@ -300,6 +300,13 @@ func (client *Client) Login(account ClientAccount) {
 	return
 }
 
+func (client *Client) setAccountName(name string) {
+	// XXX this assumes validation elsewhere
+	client.stateMutex.Lock()
+	defer client.stateMutex.Unlock()
+	client.accountName = name
+}
+
 func (client *Client) historyCutoff() (cutoff time.Time) {
 	client.stateMutex.Lock()
 	if client.account != "" {

irc/nickserv.go

@@ -347,6 +347,17 @@ command lists all current suspensions.`,
 			minParams: 1,
 			capabs:    []string{"accreg"},
 		},
+		"rename": {
+			handler: nsRenameHandler,
+			help: `Syntax: $bRENAME <account> <newname>$b
+
+RENAME allows a server administrator to change the name of an account.
+Currently, you can only change the canonical casefolding of an account
+(e.g., you can change "Alice" to "alice", but not "Alice" to "Amanda").`,
+			helpShort: `$bRENAME$b renames an account`,
+			minParams: 2,
+			capabs:    []string{"accreg"},
+		},
 	}
 )
 
@@ -1377,3 +1388,23 @@ func suspensionToString(client *Client, suspension AccountSuspension) (result st
 	}
 	return fmt.Sprintf(client.t("Account %[1]s suspended at %[2]s. Duration: %[3]s. %[4]s"), suspension.AccountName, ts, duration, reason)
 }
+
+func nsRenameHandler(server *Server, client *Client, command string, params []string, rb *ResponseBuffer) {
+	oldName, newName := params[0], params[1]
+	err := server.accounts.Rename(oldName, newName)
+
+	if err != nil {
+		nsNotice(rb, fmt.Sprintf(client.t("Couldn't rename account: %s"), client.t(err.Error())))
+		return
+	}
+
+	nsNotice(rb, client.t("Successfully renamed account"))
+	if server.Config().Accounts.NickReservation.ForceNickEqualsAccount {
+		if curClient := server.clients.Get(oldName); curClient != nil {
+			renameErr := performNickChange(client.server, client, curClient, nil, newName, rb)
+			if renameErr != nil && renameErr != errNoop {
+				nsNotice(rb, fmt.Sprintf(client.t("Warning: could not rename affected client: %v"), err))
+			}
+		}
+	}
+}