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package bdiscord
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import (
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"bytes"
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"errors"
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"fmt"
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"strings"
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"sync"
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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/42wim/matterbridge/bridge/helper"
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"github.com/bwmarrin/discordgo"
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)
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const MessageLength = 1950
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type Bdiscord struct {
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*bridge.Config
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c *discordgo.Session
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nick string
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useChannelID bool
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guildID string
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webhookID string
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webhookToken string
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canEditWebhooks bool
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channelsMutex sync.RWMutex
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channels []*discordgo.Channel
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channelInfoMap map[string]*config.ChannelInfo
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membersMutex sync.RWMutex
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userMemberMap map[string]*discordgo.Member
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nickMemberMap map[string]*discordgo.Member
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}
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func New(cfg *bridge.Config) bridge.Bridger {
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b := &Bdiscord{Config: cfg}
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b.userMemberMap = make(map[string]*discordgo.Member)
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b.nickMemberMap = make(map[string]*discordgo.Member)
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b.channelInfoMap = make(map[string]*config.ChannelInfo)
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if b.GetString("WebhookURL") != "" {
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b.Log.Debug("Configuring Discord Incoming Webhook")
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b.webhookID, b.webhookToken = b.splitURL(b.GetString("WebhookURL"))
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}
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return b
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}
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func (b *Bdiscord) Connect() error {
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var err error
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var token string
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var guildFound bool
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b.Log.Info("Connecting")
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if b.GetString("WebhookURL") == "" {
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b.Log.Info("Connecting using token")
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} else {
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b.Log.Info("Connecting using webhookurl (for posting) and token")
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}
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if !strings.HasPrefix(b.GetString("Token"), "Bot ") {
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token = "Bot " + b.GetString("Token")
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}
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// if we have a User token, remove the `Bot` prefix
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if strings.HasPrefix(b.GetString("Token"), "User ") {
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token = strings.Replace(token, "Bot ", "", -1)
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}
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b.c, err = discordgo.New(token)
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if err != nil {
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return err
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}
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b.Log.Info("Connection succeeded")
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b.c.AddHandler(b.messageCreate)
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b.c.AddHandler(b.memberUpdate)
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b.c.AddHandler(b.messageUpdate)
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b.c.AddHandler(b.messageDelete)
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err = b.c.Open()
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if err != nil {
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return err
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}
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guilds, err := b.c.UserGuilds(100, "", "")
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if err != nil {
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return err
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}
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userinfo, err := b.c.User("@me")
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if err != nil {
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return err
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}
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serverName := strings.Replace(b.GetString("Server"), "ID:", "", -1)
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b.nick = userinfo.Username
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b.channelsMutex.Lock()
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for _, guild := range guilds {
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if guild.Name == serverName || guild.ID == serverName {
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b.channels, err = b.c.GuildChannels(guild.ID)
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b.guildID = guild.ID
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guildFound = true
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if err != nil {
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break
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}
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}
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}
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b.channelsMutex.Unlock()
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if !guildFound {
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msg := fmt.Sprintf("Server \"%s\" not found", b.GetString("Server"))
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err = errors.New(msg)
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b.Log.Error(msg)
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b.Log.Info("Possible values:")
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for _, guild := range guilds {
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b.Log.Infof("Server=\"%s\" # Server name", guild.Name)
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b.Log.Infof("Server=\"%s\" # Server ID", guild.ID)
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}
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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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b.channelsMutex.RLock()
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if b.GetString("WebhookURL") == "" {
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for _, channel := range b.channels {
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b.Log.Debugf("found channel %#v", channel)
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}
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} else {
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b.canEditWebhooks = true
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for _, channel := range b.channels {
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b.Log.Debugf("found channel %#v; verifying PermissionManageWebhooks", channel)
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perms, permsErr := b.c.State.UserChannelPermissions(userinfo.ID, channel.ID)
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manageWebhooks := discordgo.PermissionManageWebhooks
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if permsErr != nil || perms&manageWebhooks != manageWebhooks {
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b.Log.Warnf("Can't manage webhooks in channel \"%s\"", channel.Name)
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b.canEditWebhooks = false
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}
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}
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if b.canEditWebhooks {
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b.Log.Info("Can manage webhooks; will edit channel for global webhook on send")
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} else {
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b.Log.Warn("Can't manage webhooks; won't edit channel for global webhook on send")
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}
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}
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b.channelsMutex.RUnlock()
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// Obtaining guild members and initializing nickname mapping.
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b.membersMutex.Lock()
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defer b.membersMutex.Unlock()
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members, err := b.c.GuildMembers(b.guildID, "", 1000)
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if err != nil {
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b.Log.Error("Error obtaining server members: ", err)
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return err
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}
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for _, member := range members {
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if member == nil {
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b.Log.Warnf("Skipping missing information for a user.")
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continue
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}
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b.userMemberMap[member.User.ID] = member
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b.nickMemberMap[member.User.Username] = member
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if member.Nick != "" {
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b.nickMemberMap[member.Nick] = member
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}
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}
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return nil
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}
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func (b *Bdiscord) Disconnect() error {
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return b.c.Close()
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}
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func (b *Bdiscord) JoinChannel(channel config.ChannelInfo) error {
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b.channelsMutex.Lock()
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defer b.channelsMutex.Unlock()
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b.channelInfoMap[channel.ID] = &channel
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idcheck := strings.Split(channel.Name, "ID:")
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if len(idcheck) > 1 {
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b.useChannelID = true
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}
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return nil
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}
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func (b *Bdiscord) Send(msg config.Message) (string, error) {
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b.Log.Debugf("=> Receiving %#v", msg)
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channelID := b.getChannelID(msg.Channel)
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if channelID == "" {
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return "", fmt.Errorf("Could not find channelID for %v", msg.Channel)
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}
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// Make a action /me of the message
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if msg.Event == config.EventUserAction {
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msg.Text = "_" + msg.Text + "_"
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}
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// use initial webhook configured for the entire Discord account
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isGlobalWebhook := true
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wID := b.webhookID
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wToken := b.webhookToken
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// check if have a channel specific webhook
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b.channelsMutex.RLock()
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if ci, ok := b.channelInfoMap[msg.Channel+b.Account]; ok {
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if ci.Options.WebhookURL != "" {
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wID, wToken = b.splitURL(ci.Options.WebhookURL)
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isGlobalWebhook = false
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}
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}
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b.channelsMutex.RUnlock()
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// Use webhook to send the message
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if wID != "" {
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// skip events
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if msg.Event != "" && msg.Event != config.EventJoinLeave && msg.Event != config.EventTopicChange {
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return "", nil
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}
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b.Log.Debugf("Broadcasting using Webhook")
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for _, f := range msg.Extra["file"] {
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fi := f.(config.FileInfo)
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if fi.Comment != "" {
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msg.Text += fi.Comment + ": "
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}
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if fi.URL != "" {
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msg.Text = fi.URL
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if fi.Comment != "" {
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msg.Text = fi.Comment + ": " + fi.URL
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}
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}
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}
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// skip empty messages
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if msg.Text == "" {
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return "", nil
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}
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msg.Text = helper.ClipMessage(msg.Text, MessageLength)
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msg.Text = b.replaceUserMentions(msg.Text)
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// discord username must be [0..32] max
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if len(msg.Username) > 32 {
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msg.Username = msg.Username[0:32]
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}
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// if we have a global webhook for this Discord account, and permission
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// to modify webhooks (previously verified), then set its channel to
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// the message channel before using it
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// TODO: this isn't necessary if the last message from this webhook was
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// sent to the current channel
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if isGlobalWebhook && b.canEditWebhooks {
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b.Log.Debugf("Setting webhook channel to \"%s\"", msg.Channel)
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_, err := b.c.WebhookEdit(wID, "", "", channelID)
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if err != nil {
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b.Log.Errorf("Could not set webhook channel: %v", err)
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return "", err
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}
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}
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err := b.c.WebhookExecute(
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wID,
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wToken,
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true,
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&discordgo.WebhookParams{
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Content: msg.Text,
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Username: msg.Username,
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AvatarURL: msg.Avatar,
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})
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return "", err
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}
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b.Log.Debugf("Broadcasting using token (API)")
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// Delete message
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if msg.Event == config.EventMsgDelete {
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if msg.ID == "" {
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return "", nil
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}
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err := b.c.ChannelMessageDelete(channelID, msg.ID)
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return "", err
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}
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// Upload a file if it exists
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if msg.Extra != nil {
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for _, rmsg := range helper.HandleExtra(&msg, b.General) {
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rmsg.Text = helper.ClipMessage(rmsg.Text, MessageLength)
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if _, err := b.c.ChannelMessageSend(channelID, rmsg.Username+rmsg.Text); err != nil {
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b.Log.Errorf("Could not send message %#v: %v", rmsg, err)
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}
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}
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// check if we have files to upload (from slack, telegram or mattermost)
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if len(msg.Extra["file"]) > 0 {
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return b.handleUploadFile(&msg, channelID)
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}
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}
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msg.Text = helper.ClipMessage(msg.Text, MessageLength)
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msg.Text = b.replaceUserMentions(msg.Text)
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// Edit message
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if msg.ID != "" {
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_, err := b.c.ChannelMessageEdit(channelID, msg.ID, msg.Username+msg.Text)
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return msg.ID, err
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}
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// Post normal message
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res, err := b.c.ChannelMessageSend(channelID, msg.Username+msg.Text)
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if err != nil {
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return "", err
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}
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return res.ID, err
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}
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// useWebhook returns true if we have a webhook defined somewhere
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func (b *Bdiscord) useWebhook() bool {
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if b.GetString("WebhookURL") != "" {
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return true
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}
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b.channelsMutex.RLock()
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defer b.channelsMutex.RUnlock()
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for _, channel := range b.channelInfoMap {
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if channel.Options.WebhookURL != "" {
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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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// isWebhookID returns true if the specified id is used in a defined webhook
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func (b *Bdiscord) isWebhookID(id string) bool {
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if b.GetString("WebhookURL") != "" {
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wID, _ := b.splitURL(b.GetString("WebhookURL"))
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if wID == id {
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return true
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}
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}
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b.channelsMutex.RLock()
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defer b.channelsMutex.RUnlock()
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for _, channel := range b.channelInfoMap {
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if channel.Options.WebhookURL != "" {
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wID, _ := b.splitURL(channel.Options.WebhookURL)
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if wID == id {
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return true
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}
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}
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}
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return false
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}
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// handleUploadFile handles native upload of files
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func (b *Bdiscord) handleUploadFile(msg *config.Message, channelID string) (string, error) {
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var err error
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for _, f := range msg.Extra["file"] {
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fi := f.(config.FileInfo)
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file := discordgo.File{
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Name: fi.Name,
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ContentType: "",
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Reader: bytes.NewReader(*fi.Data),
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}
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m := discordgo.MessageSend{
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Content: msg.Username + fi.Comment,
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Files: []*discordgo.File{&file},
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}
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_, err = b.c.ChannelMessageSendComplex(channelID, &m)
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if err != nil {
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return "", fmt.Errorf("file upload failed: %#v", err)
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}
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}
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return "", nil
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}
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