package bdiscord
import (
"bytes"
"fmt"
"regexp"
"strings"
"sync"
"github.com/42wim/matterbridge/bridge"
"github.com/42wim/matterbridge/bridge/config"
"github.com/42wim/matterbridge/bridge/helper"
"github.com/bwmarrin/discordgo"
)
type Bdiscord struct {
c * discordgo . Session
Channels [ ] * discordgo . Channel
Nick string
UseChannelID bool
userMemberMap map [ string ] * discordgo . Member
guildID string
webhookID string
webhookToken string
channelInfoMap map [ string ] * config . ChannelInfo
sync . RWMutex
* bridge . Config
}
func New ( cfg * bridge . Config ) bridge . Bridger {
b := & Bdiscord { Config : cfg }
b . userMemberMap = make ( map [ string ] * discordgo . Member )
b . channelInfoMap = make ( map [ string ] * config . ChannelInfo )
if b . GetString ( "WebhookURL" ) != "" {
b . Log . Debug ( "Configuring Discord Incoming Webhook" )
b . webhookID , b . webhookToken = b . splitURL ( b . GetString ( "WebhookURL" ) )
}
return b
}
func ( b * Bdiscord ) Connect ( ) error {
var err error
var token string
b . Log . Info ( "Connecting" )
if b . GetString ( "WebhookURL" ) == "" {
b . Log . Info ( "Connecting using token" )
} else {
b . Log . Info ( "Connecting using webhookurl (for posting) and token" )
}
if ! strings . HasPrefix ( b . GetString ( "Token" ) , "Bot " ) {
token = "Bot " + b . GetString ( "Token" )
}
b . c , err = discordgo . New ( token )
if err != nil {
return err
}
b . Log . Info ( "Connection succeeded" )
b . c . AddHandler ( b . messageCreate )
b . c . AddHandler ( b . memberUpdate )
b . c . AddHandler ( b . messageUpdate )
b . c . AddHandler ( b . messageDelete )
err = b . c . Open ( )
if err != nil {
return err
}
guilds , err := b . c . UserGuilds ( 100 , "" , "" )
if err != nil {
return err
}
userinfo , err := b . c . User ( "@me" )
if err != nil {
return err
}
b . Nick = userinfo . Username
for _ , guild := range guilds {
if guild . Name == b . GetString ( "Server" ) {
b . Channels , err = b . c . GuildChannels ( guild . ID )
b . guildID = guild . ID
if err != nil {
return err
}
}
}
for _ , channel := range b . Channels {
b . Log . Debugf ( "found channel %#v" , channel )
}
return nil
}
func ( b * Bdiscord ) Disconnect ( ) error {
return b . c . Close ( )
}
func ( b * Bdiscord ) JoinChannel ( channel config . ChannelInfo ) error {
b . channelInfoMap [ channel . ID ] = & channel
idcheck := strings . Split ( channel . Name , "ID:" )
if len ( idcheck ) > 1 {
b . UseChannelID = true
}
return nil
}
func ( b * Bdiscord ) Send ( msg config . Message ) ( string , error ) {
b . Log . Debugf ( "=> Receiving %#v" , msg )
channelID := b . getChannelID ( msg . Channel )
if channelID == "" {
return "" , fmt . Errorf ( "Could not find channelID for %v" , msg . Channel )
}
// Make a action /me of the message
if msg . Event == config . EVENT_USER_ACTION {
msg . Text = "_" + msg . Text + "_"
}
// use initial webhook
wID := b . webhookID
wToken := b . webhookToken
// check if have a channel specific webhook
if ci , ok := b . channelInfoMap [ msg . Channel + b . Account ] ; ok {
if ci . Options . WebhookURL != "" {
wID , wToken = b . splitURL ( ci . Options . WebhookURL )
}
}
// Use webhook to send the message
if wID != "" {
// skip events
if msg . Event != "" && msg . Event != config . EVENT_JOIN_LEAVE && msg . Event != config . EVENT_TOPIC_CHANGE {
return "" , nil
}
b . Log . Debugf ( "Broadcasting using Webhook" )
for _ , f := range msg . Extra [ "file" ] {
fi := f . ( config . FileInfo )
if fi . URL != "" {
msg . Text += " " + fi . URL
}
}
err := b . c . WebhookExecute (
wID ,
wToken ,
true ,
& discordgo . WebhookParams {
Content : msg . Text ,
Username : msg . Username ,
AvatarURL : msg . Avatar ,
} )
return "" , err
}
b . Log . Debugf ( "Broadcasting using token (API)" )
// Delete message
if msg . Event == config . EVENT_MSG_DELETE {
if msg . ID == "" {
return "" , nil
}
err := b . c . ChannelMessageDelete ( channelID , msg . ID )
return "" , err
}
// Upload a file if it exists
if msg . Extra != nil {
for _ , rmsg := range helper . HandleExtra ( & msg , b . General ) {
b . c . ChannelMessageSend ( channelID , rmsg . Username + rmsg . Text )
}
// check if we have files to upload (from slack, telegram or mattermost)
if len ( msg . Extra [ "file" ] ) > 0 {
return b . handleUploadFile ( & msg , channelID )
}
}
// Edit message
if msg . ID != "" {
_ , err := b . c . ChannelMessageEdit ( channelID , msg . ID , msg . Username + msg . Text )
return msg . ID , err
}
// Post normal message
res , err := b . c . ChannelMessageSend ( channelID , msg . Username + msg . Text )
if err != nil {
return "" , err
}
return res . ID , err
}
func ( b * Bdiscord ) messageDelete ( s * discordgo . Session , m * discordgo . MessageDelete ) {
rmsg := config . Message { Account : b . Account , ID : m . ID , Event : config . EVENT_MSG_DELETE , Text : config . EVENT_MSG_DELETE }
rmsg . Channel = b . getChannelName ( m . ChannelID )
if b . UseChannelID {
rmsg . Channel = "ID:" + m . ChannelID
}
b . Log . Debugf ( "<= Sending message from %s to gateway" , b . Account )
b . Log . Debugf ( "<= Message is %#v" , rmsg )
b . Remote <- rmsg
}
func ( b * Bdiscord ) messageUpdate ( s * discordgo . Session , m * discordgo . MessageUpdate ) {
if b . GetBool ( "EditDisable" ) {
return
}
// only when message is actually edited
if m . Message . EditedTimestamp != "" {
b . Log . Debugf ( "Sending edit message" )
m . Content = m . Content + b . GetString ( "EditSuffix" )
b . messageCreate ( s , ( * discordgo . MessageCreate ) ( m ) )
}
}
func ( b * Bdiscord ) messageCreate ( s * discordgo . Session , m * discordgo . MessageCreate ) {
var err error
// not relay our own messages
if m . Author . Username == b . Nick {
return
}
// if using webhooks, do not relay if it's ours
if b . useWebhook ( ) && m . Author . Bot && b . isWebhookID ( m . Author . ID ) {
return
}
// add the url of the attachments to content
if len ( m . Attachments ) > 0 {
for _ , attach := range m . Attachments {
m . Content = m . Content + "\n" + attach . URL
}
}
rmsg := config . Message { Account : b . Account , Avatar : "https://cdn.discordapp.com/avatars/" + m . Author . ID + "/" + m . Author . Avatar + ".jpg" , UserID : m . Author . ID , ID : m . ID }
if m . Content != "" {
b . Log . Debugf ( "== Receiving event %#v" , m . Message )
m . Message . Content = b . stripCustomoji ( m . Message . Content )
m . Message . Content = b . replaceChannelMentions ( m . Message . Content )
rmsg . Text , err = m . ContentWithMoreMentionsReplaced ( b . c )
if err != nil {
b . Log . Errorf ( "ContentWithMoreMentionsReplaced failed: %s" , err )
rmsg . Text = m . ContentWithMentionsReplaced ( )
}
}
// set channel name
rmsg . Channel = b . getChannelName ( m . ChannelID )
if b . UseChannelID {
rmsg . Channel = "ID:" + m . ChannelID
}
// set username
if ! b . GetBool ( "UseUserName" ) {
rmsg . Username = b . getNick ( m . Author )
} else {
rmsg . Username = m . Author . Username
}
// if we have embedded content add it to text
if b . GetBool ( "ShowEmbeds" ) && m . Message . Embeds != nil {
for _ , embed := range m . Message . Embeds {
rmsg . Text = rmsg . Text + "embed: " + embed . Title + " - " + embed . Description + " - " + embed . URL + "\n"
}
}
// no empty messages
if rmsg . Text == "" {
return
}
// do we have a /me action
var ok bool
rmsg . Text , ok = b . replaceAction ( rmsg . Text )
if ok {
rmsg . Event = config . EVENT_USER_ACTION
}
b . Log . Debugf ( "<= Sending message from %s on %s to gateway" , m . Author . Username , b . Account )
b . Log . Debugf ( "<= Message is %#v" , rmsg )
b . Remote <- rmsg
}
func ( b * Bdiscord ) memberUpdate ( s * discordgo . Session , m * discordgo . GuildMemberUpdate ) {
b . Lock ( )
if _ , ok := b . userMemberMap [ m . Member . User . ID ] ; ok {
b . Log . Debugf ( "%s: memberupdate: user %s (nick %s) changes nick to %s" , b . Account , m . Member . User . Username , b . userMemberMap [ m . Member . User . ID ] . Nick , m . Member . Nick )
}
b . userMemberMap [ m . Member . User . ID ] = m . Member
b . Unlock ( )
}
func ( b * Bdiscord ) getNick ( user * discordgo . User ) string {
var err error
b . Lock ( )
defer b . Unlock ( )
if _ , ok := b . userMemberMap [ user . ID ] ; ok {
if b . userMemberMap [ user . ID ] != nil {
if b . userMemberMap [ user . ID ] . Nick != "" {
// only return if nick is set
return b . userMemberMap [ user . ID ] . Nick
}
// otherwise return username
return user . Username
}
}
// if we didn't find nick, search for it
member , err := b . c . GuildMember ( b . guildID , user . ID )
if err != nil {
return user . Username
}
b . userMemberMap [ user . ID ] = member
// only return if nick is set
if b . userMemberMap [ user . ID ] . Nick != "" {
return b . userMemberMap [ user . ID ] . Nick
}
return user . Username
}
func ( b * Bdiscord ) getChannelID ( name string ) string {
idcheck := strings . Split ( name , "ID:" )
if len ( idcheck ) > 1 {
return idcheck [ 1 ]
}
for _ , channel := range b . Channels {
if channel . Name == name {
return channel . ID
}
}
return ""
}
func ( b * Bdiscord ) getChannelName ( id string ) string {
for _ , channel := range b . Channels {
if channel . ID == id {
return channel . Name
}
}
return ""
}
func ( b * Bdiscord ) replaceChannelMentions ( text string ) string {
var err error
re := regexp . MustCompile ( "<#[0-9]+>" )
text = re . ReplaceAllStringFunc ( text , func ( m string ) string {
channel := b . getChannelName ( m [ 2 : len ( m ) - 1 ] )
// if at first don't succeed, try again
if channel == "" {
b . Channels , err = b . c . GuildChannels ( b . guildID )
if err != nil {
return "#unknownchannel"
}
channel = b . getChannelName ( m [ 2 : len ( m ) - 1 ] )
return "#" + channel
}
return "#" + channel
} )
return text
}
func ( b * Bdiscord ) replaceAction ( text string ) ( string , bool ) {
if strings . HasPrefix ( text , "_" ) && strings . HasSuffix ( text , "_" ) {
return strings . Replace ( text , "_" , "" , - 1 ) , true
}
return text , false
}
func ( b * Bdiscord ) stripCustomoji ( text string ) string {
// <:doge:302803592035958784>
re := regexp . MustCompile ( "<(:.*?:)[0-9]+>" )
return re . ReplaceAllString ( text , ` $1 ` )
}
// splitURL splits a webhookURL and returns the id and token
func ( b * Bdiscord ) splitURL ( url string ) ( string , string ) {
webhookURLSplit := strings . Split ( url , "/" )
if len ( webhookURLSplit ) != 7 {
b . Log . Fatalf ( "%s is no correct discord WebhookURL" , url )
}
return webhookURLSplit [ len ( webhookURLSplit ) - 2 ] , webhookURLSplit [ len ( webhookURLSplit ) - 1 ]
}
// useWebhook returns true if we have a webhook defined somewhere
func ( b * Bdiscord ) useWebhook ( ) bool {
if b . GetString ( "WebhookURL" ) != "" {
return true
}
for _ , channel := range b . channelInfoMap {
if channel . Options . WebhookURL != "" {
return true
}
}
return false
}
// isWebhookID returns true if the specified id is used in a defined webhook
func ( b * Bdiscord ) isWebhookID ( id string ) bool {
if b . GetString ( "WebhookURL" ) != "" {
wID , _ := b . splitURL ( b . GetString ( "WebhookURL" ) )
if wID == id {
return true
}
}
for _ , channel := range b . channelInfoMap {
if channel . Options . WebhookURL != "" {
wID , _ := b . splitURL ( channel . Options . WebhookURL )
if wID == id {
return true
}
}
}
return false
}
// handleUploadFile handles native upload of files
func ( b * Bdiscord ) handleUploadFile ( msg * config . Message , channelID string ) ( string , error ) {
var err error
for _ , f := range msg . Extra [ "file" ] {
fi := f . ( config . FileInfo )
files := [ ] * discordgo . File { }
files = append ( files , & discordgo . File { fi . Name , "" , bytes . NewReader ( * fi . Data ) } )
_ , err = b . c . ChannelMessageSendComplex ( channelID , & discordgo . MessageSend { Content : msg . Username + fi . Comment , Files : files } )
if err != nil {
return "" , fmt . Errorf ( "file upload failed: %#v" , err )
}
}
return "" , nil
}