2016-11-14 11:50:14 +00:00
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// Copyright 2016 Liam Stanley <me@liamstanley.io>. All rights reserved.
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// Use of this source code is governed by the MIT license that can be
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// found in the LICENSE file.
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// Package girc provides a high level, yet flexible IRC library for use
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// with interacting with IRC servers. girc has support for user/channel
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// tracking, as well as a few other neat features (like auto-reconnect).
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//
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// Much of what girc can do, can also be disabled. The goal is to
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// provide a solid API that you don't necessarily have to work with out
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// of the box if you don't want to.
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//
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// See "example/main.go" for a brief and very useful example taking
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// advantage of girc, that should give you a general idea of how the API
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// works.
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2016-11-13 08:30:43 +00:00
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package girc
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import (
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"bytes"
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"crypto/tls"
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"errors"
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"fmt"
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"io"
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"io/ioutil"
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"log"
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"net"
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"sync"
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"time"
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)
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2016-11-14 11:50:14 +00:00
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// Client contains all of the information necessary to run a single IRC
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// client.
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type Client struct {
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// Config represents the configuration
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Config Config
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// Events is a buffer of events waiting to be processed.
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Events chan *Event
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// Sender is a Sender{} interface implementation.
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Sender Sender
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// state represents the throw-away state for the irc session.
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state *state
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// initTime represents the creation time of the client.
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initTime time.Time
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// cbLock is the internal locking mechanism for the callbacks map.
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cbMux sync.Mutex
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// callbacks is an internal mapping of COMMAND -> callback.
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callbacks map[string][]Callback
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// reader is the socket buffer reader from the IRC server.
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reader *Decoder
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// reader is the socket buffer write to the IRC server.
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writer *Encoder
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// conn is a net.Conn reference to the IRC server.
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conn net.Conn
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// tries represents the internal reconnect count to the IRC server.
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tries int
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// log is used if a writer is supplied for Client.Config.Logger.
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log *log.Logger
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// quitChan is used to close the connection to the IRC server.
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quitChan chan struct{}
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// hasQuit is used to determine if we've finished quitting/cleaning up.
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hasQuit bool
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}
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// Config contains configuration options for an IRC client
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type Config struct {
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// Server is a host/ip of the server you want to connect to.
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Server string
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// Port is the port that will be used during server connection.
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Port int
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// Password is the server password used to authenticate.
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Password string
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// Nick is an rfc-valid nickname used during connect.
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Nick string
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// User is the username/ident to use on connect. Ignored if identd server
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// is used.
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User string
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// Name is the "realname" that's used during connect.
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Name string
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// TLSConfig is an optional user-supplied tls configuration, used during
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// socket creation to the server.
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TLSConfig *tls.Config
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// MaxRetries is the number of times the client will attempt to reconnect
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// to the server after the last disconnect.
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MaxRetries int
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// Logger is an optional, user supplied logger to log the raw lines sent
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// from the server. Useful for debugging. Defaults to ioutil.Discard.
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Logger io.Writer
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// ReconnectDelay is the a duration of time to delay before attempting a
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// reconnection. Defaults to 10s (minimum of 10s).
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ReconnectDelay time.Duration
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// DisableTracking disables all channel and user-level tracking. Useful
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// for highly embedded scripts with single purposes.
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DisableTracking bool
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// DisableCapTracking disables all network/server capability tracking.
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// This includes determining what feature the IRC server supports, what
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// the "NETWORK=" variables are, and other useful stuff.
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DisableCapTracking bool
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// DisableNickCollision disables the clients auto-response to nickname
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// collisions. For example, if "test" is already in use, or is blocked by
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// the network/a service, the client will try and use "test_", then it
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// will attempt "test__", "test___", and so on.
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DisableNickCollision bool
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}
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// New creates a new IRC client with the specified server, name and
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// config.
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func New(config Config) *Client {
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client := &Client{
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Config: config,
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Events: make(chan *Event, 40), // buffer 40 events
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quitChan: make(chan struct{}),
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callbacks: make(map[string][]Callback),
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tries: 0,
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initTime: time.Now(),
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}
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// Register builtin helpers.
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client.registerHelpers()
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return client
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}
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// Quit disconnects from the server.s
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func (c *Client) Quit(message string) {
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c.Send(&Event{Command: QUIT, Trailing: message})
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c.hasQuit = true
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if c.conn != nil {
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c.conn.Close()
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}
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c.quitChan <- struct{}{}
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}
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// Uptime returns the amount of time that has passed since the
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// client was created.
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func (c *Client) Uptime() time.Duration {
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return time.Since(c.initTime)
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}
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// Server returns the string representation of host+port pair for net.Conn
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func (c *Client) Server() string {
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return fmt.Sprintf("%s:%d", c.Config.Server, c.Config.Port)
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}
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// Send sends an event to the server. Use Client.RunCallback() if you are
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// are simply looking to trigger callbacks with an event.
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func (c *Client) Send(event *Event) error {
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// log the event
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if !event.Sensitive {
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c.log.Print("--> ", event.String())
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}
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return c.Sender.Send(event)
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}
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// Connect attempts to connect to the given IRC server
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func (c *Client) Connect() error {
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var conn net.Conn
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var err error
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// Sanity check a few options.
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if c.Config.Server == "" || c.Config.Port == 0 || c.Config.Nick == "" || c.Config.User == "" {
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return errors.New("invalid configuration (server/port/nick/user)")
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}
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// Reset the state.
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c.state = newState()
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if c.Config.Logger == nil {
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c.Config.Logger = ioutil.Discard
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}
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c.log = log.New(c.Config.Logger, "", log.Ldate|log.Ltime|log.Lshortfile)
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if c.Config.TLSConfig == nil {
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conn, err = net.Dial("tcp", c.Server())
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} else {
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conn, err = tls.Dial("tcp", c.Server(), c.Config.TLSConfig)
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}
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if err != nil {
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return err
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}
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c.conn = conn
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c.reader = NewDecoder(conn)
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c.writer = NewEncoder(conn)
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c.Sender = serverSender{writer: c.writer}
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for _, event := range c.connectMessages() {
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if err := c.Send(event); err != nil {
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return err
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}
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}
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c.tries = 0
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go c.ReadLoop()
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// Consider the connection a success at this point.
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c.state.connected = true
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return nil
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}
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// connectMessages is a list of IRC messages to send when attempting
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// to connect to the IRC server.
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func (c *Client) connectMessages() (events []*Event) {
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// Passwords first.
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if c.Config.Password != "" {
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events = append(events, &Event{Command: PASS, Params: []string{c.Config.Password}})
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}
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// Then nickname.
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events = append(events, &Event{Command: NICK, Params: []string{c.Config.Nick}})
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// Then username and realname.
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if c.Config.Name == "" {
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c.Config.Name = c.Config.User
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}
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events = append(events, &Event{
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Command: USER,
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Params: []string{c.Config.User, "+iw", "*"},
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Trailing: c.Config.Name,
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})
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return events
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}
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// Reconnect checks to make sure we want to, and then attempts to
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// reconnect to the server.
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func (c *Client) Reconnect() (err error) {
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if c.hasQuit {
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return nil
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}
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if c.Config.ReconnectDelay < (10 * time.Second) {
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c.Config.ReconnectDelay = 10 * time.Second
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}
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if c.Config.MaxRetries > 0 {
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var err error
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c.conn.Close()
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// Re-setup events.
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c.Events = make(chan *Event, 40)
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// Delay so we're not slaughtering the server with a bunch of
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// connections.
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c.log.Printf("reconnecting to %s in %s", c.Server(), c.Config.ReconnectDelay)
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time.Sleep(c.Config.ReconnectDelay)
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for err = c.Connect(); err != nil && c.tries < c.Config.MaxRetries; c.tries++ {
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c.log.Printf("reconnecting to %s in %s (%d tries)", c.Server(), c.Config.ReconnectDelay, c.tries)
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time.Sleep(c.Config.ReconnectDelay)
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}
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return err
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}
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close(c.Events)
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return nil
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}
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// ReadLoop sets a timeout of 300 seconds, and then attempts to read
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// from the IRC server. If there is an error, it calls Reconnect.
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func (c *Client) ReadLoop() error {
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for {
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c.conn.SetDeadline(time.Now().Add(300 * time.Second))
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event, err := c.reader.Decode()
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if err != nil {
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return c.Reconnect()
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}
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c.Events <- event
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}
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}
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// Loop reads from the events channel and sends the events to be
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// handled for every message it receives.
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func (c *Client) Loop() {
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for {
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select {
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case event := <-c.Events:
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c.handleEvent(event)
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case <-c.quitChan:
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return
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}
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}
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}
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// IsConnected returns true if the client is connected to the server.
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func (c *Client) IsConnected() bool {
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c.state.m.RLock()
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defer c.state.m.RUnlock()
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return c.state.connected
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}
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// GetNick returns the current nickname of the active connection.
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//
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// Returns empty string if tracking is disabled.
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func (c *Client) GetNick() string {
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if c.Config.DisableTracking {
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return ""
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}
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c.state.m.RLock()
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defer c.state.m.RUnlock()
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if c.state.nick == "" {
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return c.Config.Nick
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}
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return c.state.nick
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2016-11-13 08:30:43 +00:00
|
|
|
}
|
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// SetNick changes the client nickname.
|
2016-11-13 08:30:43 +00:00
|
|
|
func (c *Client) SetNick(name string) {
|
2016-11-14 11:59:08 +00:00
|
|
|
c.state.m.Lock()
|
|
|
|
defer c.state.m.Unlock()
|
2016-11-13 08:30:43 +00:00
|
|
|
|
2016-11-14 11:59:08 +00:00
|
|
|
c.state.nick = name
|
2016-11-13 08:30:43 +00:00
|
|
|
c.Send(&Event{Command: NICK, Params: []string{name}})
|
|
|
|
}
|
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// GetChannels returns the active list of channels that the client
|
|
|
|
// is in.
|
2016-11-13 13:17:41 +00:00
|
|
|
//
|
2016-11-14 11:50:14 +00:00
|
|
|
// Returns nil if tracking is disabled.
|
2016-11-13 08:30:43 +00:00
|
|
|
func (c *Client) GetChannels() map[string]*Channel {
|
2016-11-14 11:50:14 +00:00
|
|
|
if c.Config.DisableTracking {
|
|
|
|
return nil
|
|
|
|
}
|
|
|
|
|
2016-11-14 11:59:08 +00:00
|
|
|
c.state.m.RLock()
|
|
|
|
defer c.state.m.RUnlock()
|
2016-11-13 08:30:43 +00:00
|
|
|
|
2016-11-14 11:59:08 +00:00
|
|
|
return c.state.channels
|
2016-11-13 08:30:43 +00:00
|
|
|
}
|
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// Who tells the client to update it's channel/user records.
|
|
|
|
//
|
|
|
|
// Does not update internal state if tracking is disabled.
|
2016-11-13 11:29:00 +00:00
|
|
|
func (c *Client) Who(target string) {
|
|
|
|
c.Send(&Event{Command: WHO, Params: []string{target, "%tcuhn,1"}})
|
2016-11-13 08:30:43 +00:00
|
|
|
}
|
2016-11-13 11:44:12 +00:00
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// Join attempts to enter an IRC channel with an optional password.
|
2016-11-13 11:44:12 +00:00
|
|
|
func (c *Client) Join(channel, password string) {
|
|
|
|
if password != "" {
|
|
|
|
c.Send(&Event{Command: JOIN, Params: []string{channel, password}})
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Send(&Event{Command: JOIN, Params: []string{channel}})
|
|
|
|
}
|
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// Part leaves an IRC channel with an optional leave message.
|
2016-11-13 11:44:12 +00:00
|
|
|
func (c *Client) Part(channel, message string) {
|
|
|
|
if message != "" {
|
|
|
|
c.Send(&Event{Command: JOIN, Params: []string{channel}, Trailing: message})
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Send(&Event{Command: JOIN, Params: []string{channel}})
|
|
|
|
}
|
2016-11-13 13:52:16 +00:00
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// Message sends a PRIVMSG to target (either channel, service, or
|
|
|
|
// user).
|
2016-11-13 13:52:16 +00:00
|
|
|
func (c *Client) Message(target, message string) {
|
|
|
|
c.Send(&Event{Command: PRIVMSG, Params: []string{target}, Trailing: message})
|
|
|
|
}
|
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// Messagef sends a formated PRIVMSG to target (either channel,
|
|
|
|
// service, or user).
|
2016-11-13 13:52:16 +00:00
|
|
|
func (c *Client) Messagef(target, format string, a ...interface{}) {
|
|
|
|
c.Message(target, fmt.Sprintf(format, a...))
|
|
|
|
}
|
2016-11-13 14:00:39 +00:00
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// Action sends a PRIVMSG ACTION (/me) to target (either channel,
|
|
|
|
// service, or user).
|
2016-11-13 14:00:39 +00:00
|
|
|
func (c *Client) Action(target, message string) {
|
|
|
|
c.Send(&Event{Command: PRIVMSG, Params: []string{target}, Trailing: fmt.Sprintf("\001ACTION %s\001", message)})
|
|
|
|
}
|
|
|
|
|
2016-11-14 11:50:14 +00:00
|
|
|
// Actionf sends a formated PRIVMSG ACTION (/me) to target (either
|
|
|
|
// channel, service, or user).
|
2016-11-13 14:00:39 +00:00
|
|
|
func (c *Client) Actionf(target, format string, a ...interface{}) {
|
|
|
|
c.Action(target, fmt.Sprintf(format, a...))
|
|
|
|
}
|
2016-11-17 15:26:33 +00:00
|
|
|
|
|
|
|
// Notice sends a NOTICE to target (either channel, service, or user).
|
|
|
|
func (c *Client) Notice(target, message string) {
|
|
|
|
c.Send(&Event{Command: NOTICE, Params: []string{target}, Trailing: message})
|
|
|
|
}
|
|
|
|
|
|
|
|
// Noticef sends a formated NOTICE to target (either channel, service, or user).
|
|
|
|
func (c *Client) Noticef(target, format string, a ...interface{}) {
|
|
|
|
c.Notice(target, fmt.Sprintf(format, a...))
|
|
|
|
}
|
2016-11-17 19:55:09 +00:00
|
|
|
|
|
|
|
// SendRaw sends a raw string back to the server, without carriage returns or
|
|
|
|
// newlines.
|
|
|
|
func (c *Client) SendRaw(raw string) {
|
|
|
|
e := ParseEvent(raw)
|
|
|
|
if e == nil {
|
|
|
|
c.log.Printf("invalid event: %q", raw)
|
|
|
|
return
|
|
|
|
}
|
|
|
|
|
|
|
|
c.Send(e)
|
|
|
|
}
|
|
|
|
|
|
|
|
// SendRawf sends a formated string back to the server, without carriage
|
|
|
|
// returns or newlines.
|
|
|
|
func (c *Client) SendRawf(format string, a ...interface{}) {
|
|
|
|
c.SendRaw(fmt.Sprintf(format, a...))
|
|
|
|
}
|
2016-11-18 20:17:09 +00:00
|
|
|
|
2016-11-18 22:10:58 +00:00
|
|
|
// contains '*', even though this isn't RFC compliant, it's commonly used
|
|
|
|
var validChannelPrefixes = [...]string{"&", "#", "+", "!", "*"}
|
|
|
|
|
2016-11-18 20:17:09 +00:00
|
|
|
// IsValidChannel checks if channel is an RFC complaint channel or not
|
2016-11-18 22:10:58 +00:00
|
|
|
//
|
|
|
|
// channel = ( "#" / "+" / ( "!" channelid ) / "&" ) chanstring
|
|
|
|
// [ ":" chanstring ]
|
|
|
|
// chanstring = 0x01-0x07 / 0x08-0x09 / 0x0B-0x0C / 0x0E-0x1F / 0x21-0x2B
|
|
|
|
// chanstring = / 0x2D-0x39 / 0x3B-0xFF
|
|
|
|
// ; any octet except NUL, BELL, CR, LF, " ", "," and ":"
|
|
|
|
// channelid = 5( 0x41-0x5A / digit ) ; 5( A-Z / 0-9 )
|
2016-11-18 20:17:09 +00:00
|
|
|
func IsValidChannel(channel string) bool {
|
|
|
|
if len(channel) <= 1 || len(channel) > 50 {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
2016-11-18 22:10:58 +00:00
|
|
|
// #, +, !<channelid>, or &
|
|
|
|
// Including "*" in the prefix list, as this is commonly used (e.g. ZNC)
|
|
|
|
if bytes.IndexByte([]byte{0x21, 0x23, 0x26, 0x2A, 0x2B}, channel[0]) == -1 {
|
2016-11-18 20:17:09 +00:00
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
2016-11-18 22:10:58 +00:00
|
|
|
// !<channelid> -- not very commonly supported, but we'll check it anyway.
|
|
|
|
// The ID must be 5 chars. This means min-channel size should be:
|
|
|
|
// 1 (prefix) + 5 (id) + 1 (+, channel name)
|
|
|
|
if channel[0] == 0x21 {
|
|
|
|
if len(channel) < 7 {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
// check for valid ID
|
|
|
|
for i := 1; i < 6; i++ {
|
|
|
|
if (channel[i] < 0x30 || channel[i] > 0x39) && (channel[i] < 0x41 || channel[i] > 0x5A) {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
// Check for invalid octets here.
|
|
|
|
bad := []byte{0x00, 0x07, 0x0D, 0x0A, 0x20, 0x2C, 0x3A}
|
|
|
|
for i := 1; i < len(channel); i++ {
|
|
|
|
if bytes.IndexByte(bad, channel[i]) != -1 {
|
|
|
|
return false
|
|
|
|
}
|
2016-11-18 20:17:09 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return true
|
|
|
|
}
|
|
|
|
|
|
|
|
// IsValidNick valids an IRC nickame. Note that this does not valid IRC
|
|
|
|
// nickname length.
|
2016-11-18 22:10:58 +00:00
|
|
|
//
|
|
|
|
// nickname = ( letter / special ) *8( letter / digit / special / "-" )
|
|
|
|
// letter = 0x41-0x5A / 0x61-0x7A
|
|
|
|
// digit = 0x30-0x39
|
|
|
|
// special = 0x5B-0x60 / 0x7B-0x7D
|
2016-11-18 20:17:09 +00:00
|
|
|
func IsValidNick(nick string) bool {
|
|
|
|
if len(nick) <= 0 {
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
// Check the first index. Some characters aren't allowed for the first
|
|
|
|
// index of an IRC nickname.
|
|
|
|
if nick[0] < 0x41 || nick[0] > 0x7D {
|
|
|
|
// a-z, A-Z, and _\[]{}^|
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
|
|
|
|
for i := 1; i < len(nick); i++ {
|
|
|
|
if (nick[i] < 0x41 || nick[i] > 0x7D) && (nick[i] < 0x30 || nick[i] > 0x39) && nick[i] != 0x2D {
|
|
|
|
// a-z, A-Z, 0-9, -, and _\[]{}^|
|
|
|
|
return false
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
return true
|
|
|
|
}
|