427 lines
12 KiB
Go
427 lines
12 KiB
Go
package gateway
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import (
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"regexp"
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"strings"
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"time"
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"github.com/42wim/matterbridge/bridge"
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"github.com/42wim/matterbridge/bridge/config"
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"github.com/hashicorp/golang-lru"
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"github.com/peterhellberg/emojilib"
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"github.com/sirupsen/logrus"
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)
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type Gateway struct {
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config.Config
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Router *Router
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MyConfig *config.Gateway
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Bridges map[string]*bridge.Bridge
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Channels map[string]*config.ChannelInfo
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ChannelOptions map[string]config.ChannelOptions
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Message chan config.Message
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Name string
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Messages *lru.Cache
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}
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type BrMsgID struct {
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br *bridge.Bridge
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ID string
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ChannelID string
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}
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var flog *logrus.Entry
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const (
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apiProtocol = "api"
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)
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func New(cfg config.Gateway, r *Router) *Gateway {
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flog = logrus.WithFields(logrus.Fields{"prefix": "gateway"})
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gw := &Gateway{Channels: make(map[string]*config.ChannelInfo), Message: r.Message,
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Router: r, Bridges: make(map[string]*bridge.Bridge), Config: r.Config}
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cache, _ := lru.New(5000)
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gw.Messages = cache
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if err := gw.AddConfig(&cfg); err != nil {
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flog.Errorf("AddConfig failed: %s", err)
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}
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return gw
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}
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// Find the canonical ID that the message is keyed under in cache
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func (gw *Gateway) FindCanonicalMsgID(protocol string, mID string) string {
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ID := protocol + " " + mID
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if gw.Messages.Contains(ID) {
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return mID
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}
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// If not keyed, iterate through cache for downstream, and infer upstream.
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for _, mid := range gw.Messages.Keys() {
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v, _ := gw.Messages.Peek(mid)
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ids := v.([]*BrMsgID)
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for _, downstreamMsgObj := range ids {
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if ID == downstreamMsgObj.ID {
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return strings.Replace(mid.(string), protocol+" ", "", 1)
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}
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}
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}
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return ""
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}
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func (gw *Gateway) AddBridge(cfg *config.Bridge) error {
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br := gw.Router.getBridge(cfg.Account)
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if br == nil {
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br = bridge.New(cfg)
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br.Config = gw.Router.Config
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br.General = &gw.BridgeValues().General
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// set logging
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br.Log = logrus.WithFields(logrus.Fields{"prefix": "bridge"})
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brconfig := &bridge.Config{Remote: gw.Message, Log: logrus.WithFields(logrus.Fields{"prefix": br.Protocol}), Bridge: br}
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// add the actual bridger for this protocol to this bridge using the bridgeMap
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br.Bridger = gw.Router.BridgeMap[br.Protocol](brconfig)
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}
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gw.mapChannelsToBridge(br)
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gw.Bridges[cfg.Account] = br
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return nil
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}
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func (gw *Gateway) AddConfig(cfg *config.Gateway) error {
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gw.Name = cfg.Name
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gw.MyConfig = cfg
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if err := gw.mapChannels(); err != nil {
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flog.Errorf("mapChannels() failed: %s", err)
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}
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for _, br := range append(gw.MyConfig.In, append(gw.MyConfig.InOut, gw.MyConfig.Out...)...) {
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br := br //scopelint
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err := gw.AddBridge(&br)
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (gw *Gateway) mapChannelsToBridge(br *bridge.Bridge) {
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for ID, channel := range gw.Channels {
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if br.Account == channel.Account {
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br.Channels[ID] = *channel
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}
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}
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}
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func (gw *Gateway) reconnectBridge(br *bridge.Bridge) {
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if err := br.Disconnect(); err != nil {
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flog.Errorf("Disconnect() %s failed: %s", br.Account, err)
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}
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time.Sleep(time.Second * 5)
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RECONNECT:
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flog.Infof("Reconnecting %s", br.Account)
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err := br.Connect()
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if err != nil {
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flog.Errorf("Reconnection failed: %s. Trying again in 60 seconds", err)
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time.Sleep(time.Second * 60)
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goto RECONNECT
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}
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br.Joined = make(map[string]bool)
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if err := br.JoinChannels(); err != nil {
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flog.Errorf("JoinChannels() %s failed: %s", br.Account, err)
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}
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}
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func (gw *Gateway) mapChannelConfig(cfg []config.Bridge, direction string) {
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for _, br := range cfg {
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if isAPI(br.Account) {
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br.Channel = apiProtocol
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}
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// make sure to lowercase irc channels in config #348
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if strings.HasPrefix(br.Account, "irc.") {
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br.Channel = strings.ToLower(br.Channel)
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}
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ID := br.Channel + br.Account
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if _, ok := gw.Channels[ID]; !ok {
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channel := &config.ChannelInfo{Name: br.Channel, Direction: direction, ID: ID, Options: br.Options, Account: br.Account,
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SameChannel: make(map[string]bool)}
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channel.SameChannel[gw.Name] = br.SameChannel
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gw.Channels[channel.ID] = channel
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} else {
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// if we already have a key and it's not our current direction it means we have a bidirectional inout
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if gw.Channels[ID].Direction != direction {
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gw.Channels[ID].Direction = "inout"
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}
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}
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gw.Channels[ID].SameChannel[gw.Name] = br.SameChannel
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}
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}
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func (gw *Gateway) mapChannels() error {
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gw.mapChannelConfig(gw.MyConfig.In, "in")
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gw.mapChannelConfig(gw.MyConfig.Out, "out")
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gw.mapChannelConfig(gw.MyConfig.InOut, "inout")
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return nil
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}
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func (gw *Gateway) getDestChannel(msg *config.Message, dest bridge.Bridge) []config.ChannelInfo {
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var channels []config.ChannelInfo
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// for messages received from the api check that the gateway is the specified one
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if msg.Protocol == apiProtocol && gw.Name != msg.Gateway {
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return channels
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}
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// if source channel is in only, do nothing
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for _, channel := range gw.Channels {
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// lookup the channel from the message
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if channel.ID == getChannelID(*msg) {
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// we only have destinations if the original message is from an "in" (sending) channel
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if !strings.Contains(channel.Direction, "in") {
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return channels
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}
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continue
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}
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}
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for _, channel := range gw.Channels {
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if _, ok := gw.Channels[getChannelID(*msg)]; !ok {
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continue
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}
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// do samechannelgateway flogic
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if channel.SameChannel[msg.Gateway] {
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if msg.Channel == channel.Name && msg.Account != dest.Account {
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channels = append(channels, *channel)
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}
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continue
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}
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if strings.Contains(channel.Direction, "out") && channel.Account == dest.Account && gw.validGatewayDest(msg) {
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channels = append(channels, *channel)
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}
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}
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return channels
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}
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func (gw *Gateway) getDestMsgID(msgID string, dest *bridge.Bridge, channel config.ChannelInfo) string {
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if res, ok := gw.Messages.Get(msgID); ok {
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IDs := res.([]*BrMsgID)
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for _, id := range IDs {
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// check protocol, bridge name and channelname
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// for people that reuse the same bridge multiple times. see #342
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if dest.Protocol == id.br.Protocol && dest.Name == id.br.Name && channel.ID == id.ChannelID {
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return strings.Replace(id.ID, dest.Protocol+" ", "", 1)
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}
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}
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}
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return ""
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}
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// ignoreTextEmpty returns true if we need to ignore a message with an empty text.
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func (gw *Gateway) ignoreTextEmpty(msg *config.Message) bool {
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if msg.Text != "" {
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return false
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}
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if msg.Event == config.EventUserTyping {
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return false
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}
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// we have an attachment or actual bytes, do not ignore
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if msg.Extra != nil &&
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(msg.Extra["attachments"] != nil ||
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len(msg.Extra["file"]) > 0 ||
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len(msg.Extra[config.EventFileFailureSize]) > 0) {
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return false
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}
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flog.Debugf("ignoring empty message %#v from %s", msg, msg.Account)
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return true
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}
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// ignoreTexts returns true if msg.Text matches any of the input regexes.
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func (gw *Gateway) ignoreTexts(msg *config.Message, input []string) bool {
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for _, entry := range input {
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if entry == "" {
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continue
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}
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// TODO do not compile regexps everytime
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re, err := regexp.Compile(entry)
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if err != nil {
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flog.Errorf("incorrect regexp %s for %s", entry, msg.Account)
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continue
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}
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if re.MatchString(msg.Text) {
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flog.Debugf("matching %s. ignoring %s from %s", entry, msg.Text, msg.Account)
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return true
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}
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}
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return false
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}
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// ignoreNicks returns true if msg.Username matches any of the input regexes.
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func (gw *Gateway) ignoreNicks(msg *config.Message, input []string) bool {
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// is the username in IgnoreNicks field
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for _, entry := range input {
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if msg.Username == entry {
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flog.Debugf("ignoring %s from %s", msg.Username, msg.Account)
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return true
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}
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}
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return false
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}
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func (gw *Gateway) ignoreMessage(msg *config.Message) bool {
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// if we don't have the bridge, ignore it
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if _, ok := gw.Bridges[msg.Account]; !ok {
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return true
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}
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igNicks := strings.Fields(gw.Bridges[msg.Account].GetString("IgnoreNicks"))
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igMessages := strings.Fields(gw.Bridges[msg.Account].GetString("IgnoreMessages"))
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if gw.ignoreTextEmpty(msg) || gw.ignoreNicks(msg, igNicks) || gw.ignoreTexts(msg, igMessages) {
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return true
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}
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return false
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}
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func (gw *Gateway) modifyUsername(msg config.Message, dest *bridge.Bridge) string {
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br := gw.Bridges[msg.Account]
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msg.Protocol = br.Protocol
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if dest.GetBool("StripNick") {
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re := regexp.MustCompile("[^a-zA-Z0-9]+")
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msg.Username = re.ReplaceAllString(msg.Username, "")
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}
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nick := dest.GetString("RemoteNickFormat")
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// loop to replace nicks
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for _, outer := range br.GetStringSlice2D("ReplaceNicks") {
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search := outer[0]
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replace := outer[1]
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// TODO move compile to bridge init somewhere
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re, err := regexp.Compile(search)
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if err != nil {
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flog.Errorf("regexp in %s failed: %s", msg.Account, err)
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break
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}
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msg.Username = re.ReplaceAllString(msg.Username, replace)
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}
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if len(msg.Username) > 0 {
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// fix utf-8 issue #193
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i := 0
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for index := range msg.Username {
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if i == 1 {
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i = index
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break
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}
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i++
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}
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nick = strings.Replace(nick, "{NOPINGNICK}", msg.Username[:i]+""+msg.Username[i:], -1)
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}
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nick = strings.Replace(nick, "{BRIDGE}", br.Name, -1)
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nick = strings.Replace(nick, "{PROTOCOL}", br.Protocol, -1)
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nick = strings.Replace(nick, "{GATEWAY}", gw.Name, -1)
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nick = strings.Replace(nick, "{LABEL}", br.GetString("Label"), -1)
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nick = strings.Replace(nick, "{NICK}", msg.Username, -1)
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nick = strings.Replace(nick, "{CHANNEL}", msg.Channel, -1)
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return nick
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}
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func (gw *Gateway) modifyAvatar(msg config.Message, dest *bridge.Bridge) string {
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iconurl := dest.GetString("IconURL")
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iconurl = strings.Replace(iconurl, "{NICK}", msg.Username, -1)
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if msg.Avatar == "" {
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msg.Avatar = iconurl
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}
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return msg.Avatar
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}
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func (gw *Gateway) modifyMessage(msg *config.Message) {
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// replace :emoji: to unicode
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msg.Text = emojilib.Replace(msg.Text)
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br := gw.Bridges[msg.Account]
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// loop to replace messages
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for _, outer := range br.GetStringSlice2D("ReplaceMessages") {
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search := outer[0]
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replace := outer[1]
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// TODO move compile to bridge init somewhere
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re, err := regexp.Compile(search)
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if err != nil {
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flog.Errorf("regexp in %s failed: %s", msg.Account, err)
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break
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}
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msg.Text = re.ReplaceAllString(msg.Text, replace)
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}
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// messages from api have Gateway specified, don't overwrite
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if msg.Protocol != apiProtocol {
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msg.Gateway = gw.Name
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}
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}
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// SendMessage sends a message (with specified parentID) to the channel on the selected destination bridge.
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// returns a message id and error.
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func (gw *Gateway) SendMessage(origmsg config.Message, dest *bridge.Bridge, channel config.ChannelInfo, canonicalParentMsgID string) (string, error) {
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msg := origmsg
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// Only send the avatar download event to ourselves.
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if msg.Event == config.EventAvatarDownload {
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if channel.ID != getChannelID(origmsg) {
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return "", nil
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}
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} else {
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// do not send to ourself for any other event
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if channel.ID == getChannelID(origmsg) {
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return "", nil
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}
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}
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// Too noisy to log like other events
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if msg.Event != config.EventUserTyping {
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flog.Debugf("=> Sending %#v from %s (%s) to %s (%s)", msg, msg.Account, origmsg.Channel, dest.Account, channel.Name)
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}
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msg.Channel = channel.Name
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msg.Avatar = gw.modifyAvatar(origmsg, dest)
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msg.Username = gw.modifyUsername(origmsg, dest)
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msg.ID = gw.getDestMsgID(origmsg.Protocol+" "+origmsg.ID, dest, channel)
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// for api we need originchannel as channel
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if dest.Protocol == apiProtocol {
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msg.Channel = origmsg.Channel
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}
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msg.ParentID = gw.getDestMsgID(origmsg.Protocol+" "+canonicalParentMsgID, dest, channel)
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if msg.ParentID == "" {
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msg.ParentID = canonicalParentMsgID
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}
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// if we are using mattermost plugin account, send messages to MattermostPlugin channel
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// that can be picked up by the mattermost matterbridge plugin
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if dest.Account == "mattermost.plugin" {
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gw.Router.MattermostPlugin <- msg
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}
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mID, err := dest.Send(msg)
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if err != nil {
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return mID, err
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}
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// append the message ID (mID) from this bridge (dest) to our brMsgIDs slice
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if mID != "" {
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flog.Debugf("mID %s: %s", dest.Account, mID)
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return mID, nil
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//brMsgIDs = append(brMsgIDs, &BrMsgID{dest, dest.Protocol + " " + mID, channel.ID})
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}
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return "", nil
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}
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func (gw *Gateway) validGatewayDest(msg *config.Message) bool {
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return msg.Gateway == gw.Name
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}
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func getChannelID(msg config.Message) string {
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return msg.Channel + msg.Account
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}
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func isAPI(account string) bool {
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return strings.HasPrefix(account, "api.")
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}
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