package bdiscord
import (
"bytes"
"errors"
"fmt"
"strings"
"sync"
"github.com/42wim/matterbridge/bridge"
"github.com/42wim/matterbridge/bridge/config"
"github.com/42wim/matterbridge/bridge/helper"
"github.com/bwmarrin/discordgo"
)
const MessageLength = 1950
type Bdiscord struct {
*bridge.Config
c *discordgo.Session
nick string
useChannelID bool
guildID string
webhookID string
webhookToken string
canEditWebhooks bool
channelsMutex sync.RWMutex
channels []*discordgo.Channel
channelInfoMap map[string]*config.ChannelInfo
membersMutex sync.RWMutex
userMemberMap map[string]*discordgo.Member
nickMemberMap map[string]*discordgo.Member
}
func New(cfg *bridge.Config) bridge.Bridger {
b := &Bdiscord{Config: cfg}
b.userMemberMap = make(map[string]*discordgo.Member)
b.nickMemberMap = 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 guildFound bool
token := b.GetString("Token")
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")
}
// if we have a User token, remove the `Bot` prefix
if strings.HasPrefix(b.GetString("Token"), "User ") {
token = strings.Replace(b.GetString("Token"), "User ", "", -1)
}
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)
b.c.AddHandler(b.memberAdd)
b.c.AddHandler(b.memberRemove)
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
}
serverName := strings.Replace(b.GetString("Server"), "ID:", "", -1)
b.nick = userinfo.Username
b.channelsMutex.Lock()
for _, guild := range guilds {
if guild.Name == serverName || guild.ID == serverName {
b.channels, err = b.c.GuildChannels(guild.ID)
b.guildID = guild.ID
guildFound = true
if err != nil {
break
}
}
}
b.channelsMutex.Unlock()
if !guildFound {
msg := fmt.Sprintf("Server \"%s\" not found", b.GetString("Server"))
err = errors.New(msg)
b.Log.Error(msg)
b.Log.Info("Possible values:")
for _, guild := range guilds {
b.Log.Infof("Server=\"%s\" # Server name", guild.Name)
b.Log.Infof("Server=\"%s\" # Server ID", guild.ID)
}
}
if err != nil {
return err
}
b.channelsMutex.RLock()
if b.GetString("WebhookURL") == "" {
for _, channel := range b.channels {
b.Log.Debugf("found channel %#v", channel)
}
} else {
b.canEditWebhooks = true
for _, channel := range b.channels {
b.Log.Debugf("found channel %#v; verifying PermissionManageWebhooks", channel)
perms, permsErr := b.c.State.UserChannelPermissions(userinfo.ID, channel.ID)
manageWebhooks := discordgo.PermissionManageWebhooks
if permsErr != nil || perms&manageWebhooks != manageWebhooks {
b.Log.Warnf("Can't manage webhooks in channel \"%s\"", channel.Name)
b.canEditWebhooks = false
}
}
if b.canEditWebhooks {
b.Log.Info("Can manage webhooks; will edit channel for global webhook on send")
} else {
b.Log.Warn("Can't manage webhooks; won't edit channel for global webhook on send")
}
}
b.channelsMutex.RUnlock()
// Obtaining guild members and initializing nickname mapping.
b.membersMutex.Lock()
defer b.membersMutex.Unlock()
members, err := b.c.GuildMembers(b.guildID, "", 1000)
if err != nil {
b.Log.Error("Error obtaining server members: ", err)
return err
}
for _, member := range members {
if member == nil {
b.Log.Warnf("Skipping missing information for a user.")
continue
}
b.userMemberMap[member.User.ID] = member
b.nickMemberMap[member.User.Username] = member
if member.Nick != "" {
b.nickMemberMap[member.Nick] = member
}
}
return nil
}
func (b *Bdiscord) Disconnect() error {
return b.c.Close()
}
func (b *Bdiscord) JoinChannel(channel config.ChannelInfo) error {
b.channelsMutex.Lock()
defer b.channelsMutex.Unlock()
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.EventUserAction {
msg.Text = "_" + msg.Text + "_"
}
// use initial webhook configured for the entire Discord account
isGlobalWebhook := true
wID := b.webhookID
wToken := b.webhookToken
// check if have a channel specific webhook
b.channelsMutex.RLock()
if ci, ok := b.channelInfoMap[msg.Channel+b.Account]; ok {
if ci.Options.WebhookURL != "" {
wID, wToken = b.splitURL(ci.Options.WebhookURL)
isGlobalWebhook = false
}
}
b.channelsMutex.RUnlock()
// Use webhook to send the message
if wID != "" {
// skip events
if msg.Event != "" && msg.Event != config.EventJoinLeave && msg.Event != config.EventTopicChange {
return "", nil
}
b.Log.Debugf("Broadcasting using Webhook")
for _, f := range msg.Extra["file"] {
fi := f.(config.FileInfo)
if fi.Comment != "" {
msg.Text += fi.Comment + ": "
}
if fi.URL != "" {
msg.Text = fi.URL
if fi.Comment != "" {
msg.Text = fi.Comment + ": " + fi.URL
}
}
}
// skip empty messages
if msg.Text == "" {
return "", nil
}
msg.Text = helper.ClipMessage(msg.Text, MessageLength)
msg.Text = b.replaceUserMentions(msg.Text)
// discord username must be [0..32] max
if len(msg.Username) > 32 {
msg.Username = msg.Username[0:32]
}
// if we have a global webhook for this Discord account, and permission
// to modify webhooks (previously verified), then set its channel to
// the message channel before using it
// TODO: this isn't necessary if the last message from this webhook was
// sent to the current channel
if isGlobalWebhook && b.canEditWebhooks {
b.Log.Debugf("Setting webhook channel to \"%s\"", msg.Channel)
_, err := b.c.WebhookEdit(wID, "", "", channelID)
if err != nil {
b.Log.Errorf("Could not set webhook channel: %s", err)
return "", err
}
}
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.EventMsgDelete {
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) {
rmsg.Text = helper.ClipMessage(rmsg.Text, MessageLength)
if _, err := b.c.ChannelMessageSend(channelID, rmsg.Username+rmsg.Text); err != nil {
b.Log.Errorf("Could not send message %#v: %s", rmsg, err)
}
}
// check if we have files to upload (from slack, telegram or mattermost)
if len(msg.Extra["file"]) > 0 {
return b.handleUploadFile(&msg, channelID)
}
}
msg.Text = helper.ClipMessage(msg.Text, MessageLength)
msg.Text = b.replaceUserMentions(msg.Text)
// 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
}
// useWebhook returns true if we have a webhook defined somewhere
func (b *Bdiscord) useWebhook() bool {
if b.GetString("WebhookURL") != "" {
return true
}
b.channelsMutex.RLock()
defer b.channelsMutex.RUnlock()
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
}
}
b.channelsMutex.RLock()
defer b.channelsMutex.RUnlock()
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)
file := discordgo.File{
Name: fi.Name,
ContentType: "",
Reader: bytes.NewReader(*fi.Data),
}
m := discordgo.MessageSend{
Content: msg.Username + fi.Comment,
Files: []*discordgo.File{&file},
}
_, err = b.c.ChannelMessageSendComplex(channelID, &m)
if err != nil {
return "", fmt.Errorf("file upload failed: %s", err)
}
}
return "", nil
}