From 596096d6dac2eae4143e6a9b596df309bc2dc2be Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Mon, 19 Sep 2016 21:05:13 +0200
Subject: [PATCH] Add the discord bridge for real

---
 bridge/discord/discord.go | 128 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 bridge/discord/discord.go

diff --git a/bridge/discord/discord.go b/bridge/discord/discord.go
new file mode 100644
index 00000000..b144392c
--- /dev/null
+++ b/bridge/discord/discord.go
@@ -0,0 +1,128 @@
+package bdiscord
+
+import (
+	"github.com/42wim/matterbridge/bridge/config"
+	log "github.com/Sirupsen/logrus"
+	"github.com/bwmarrin/discordgo"
+)
+
+type bdiscord struct {
+	c        *discordgo.Session
+	Config   *config.Protocol
+	Remote   chan config.Message
+	protocol string
+	origin   string
+	Channels []*discordgo.Channel
+	Nick     string
+}
+
+var flog *log.Entry
+var protocol = "discord"
+
+func init() {
+	flog = log.WithFields(log.Fields{"module": protocol})
+}
+
+func New(config config.Protocol, origin string, c chan config.Message) *bdiscord {
+	b := &bdiscord{}
+	b.Config = &config
+	b.Remote = c
+	b.protocol = protocol
+	b.origin = origin
+	return b
+}
+
+func (b *bdiscord) Connect() error {
+	var err error
+	flog.Info("Trying " + b.protocol + " connection")
+	b.c, err = discordgo.New(b.Config.Token)
+	if err != nil {
+		flog.Debugf("%#v", err)
+		return err
+	}
+	flog.Info("Connection succeeded")
+	b.c.AddHandler(b.messageCreate)
+	err = b.c.Open()
+	if err != nil {
+		flog.Debugf("%#v", err)
+		return err
+	}
+	guilds, err := b.c.UserGuilds()
+	if err != nil {
+		flog.Debugf("%#v", err)
+		return err
+	}
+	userinfo, err := b.c.User("@me")
+	if err != nil {
+		flog.Debugf("%#v", err)
+		return err
+	}
+	b.Nick = userinfo.Username
+	for _, guild := range guilds {
+		if guild.Name == b.Config.Guild {
+			b.Channels, err = b.c.GuildChannels(guild.ID)
+			if err != nil {
+				flog.Debugf("%#v", err)
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (b *bdiscord) FullOrigin() string {
+	return b.protocol + "." + b.origin
+}
+
+func (b *bdiscord) JoinChannel(channel string) error {
+	return nil
+}
+
+func (b *bdiscord) Name() string {
+	return b.protocol + "." + b.origin
+}
+
+func (b *bdiscord) Protocol() string {
+	return b.protocol
+}
+
+func (b *bdiscord) Origin() string {
+	return b.origin
+}
+
+func (b *bdiscord) Send(msg config.Message) error {
+	channelID := b.getChannelID(msg.Channel)
+	if channelID == "" {
+		flog.Errorf("Could not find channelID for %v", msg.Channel)
+		return nil
+	}
+	b.c.ChannelMessageSend(channelID, msg.Username+msg.Text)
+	return nil
+}
+
+func (b *bdiscord) messageCreate(s *discordgo.Session, m *discordgo.MessageCreate) {
+	// not relay our own messages
+	if m.Author.Username == b.Nick {
+		return
+	}
+	b.Remote <- config.Message{Username: m.Author.Username, Text: m.Content, Channel: b.getChannelName(m.ChannelID),
+		Origin: b.origin, Protocol: b.protocol, FullOrigin: b.FullOrigin()}
+}
+
+func (b *bdiscord) getChannelID(name string) string {
+	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 ""
+}