canopeas/discord/discord.go

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package discord
import (
"strings"
"time"
"go.etztech.xyz/sedbot/config"
"go.etztech.xyz/sedbot/database"
"github.com/bwmarrin/discordgo"
"go.jolheiser.com/beaver"
)
// Register commands to this map
var (
commands = make(map[string]command)
messageRoleMap = make(map[string]map[string]string)
memeRateLimit *rateLimit
)
type commandInit struct {
session *discordgo.Session
message *discordgo.Message
config *config.Config
database *database.Database
}
type command struct {
validate func(cmd commandInit) bool
run func(cmd commandInit) (string, error)
help string
}
func Bot(cfg *config.Config, db *database.Database) (*discordgo.Session, error) {
bot, err := discordgo.New("Bot " + cfg.Token)
if err != nil {
return nil, err
}
for _, messageRole := range cfg.MessageRoles {
if messageRoleMap[messageRole.MessageID] == nil {
messageRoleMap[messageRole.MessageID] = make(map[string]string)
}
_ = bot.MessageReactionAdd(messageRole.ChannelID, messageRole.MessageID, messageRole.Emoji)
messageRoleMap[messageRole.MessageID][messageRole.Emoji] = messageRole.RoleID
}
Echo(cfg)
bot.AddHandler(readyHandler())
bot.AddHandler(commandHandler(cfg, db))
bot.AddHandler(messageHandler(cfg, db))
bot.AddHandler(reactionAddHandler())
bot.AddHandler(reactionRemoveHandler())
// Rate limits
d, err := time.ParseDuration(cfg.MemeRate)
if err != nil {
return nil, err
}
memeRateLimit = NewRateLimit(d)
return bot, nil
}
func sendTyping(s *discordgo.Session, channelID string) {
if err := s.ChannelTyping(channelID); err != nil {
beaver.Errorf("could not send typing status: %v", err)
}
}
func sendMessage(s *discordgo.Session, channelID, content string) *discordgo.Message {
msg, err := s.ChannelMessageSend(channelID, content)
if err != nil {
beaver.Errorf("could not send message: %v", err)
return nil
}
return msg
}
func isStaff(authorRoleIDs, staffRoleIDs []string) bool {
for _, aRole := range authorRoleIDs {
for _, sRole := range staffRoleIDs {
if aRole == sRole {
return true
}
}
}
return false
}
func readyHandler() func(s *discordgo.Session, m *discordgo.Ready) {
return func(s *discordgo.Session, r *discordgo.Ready) {
beaver.Infof("https://discord.com/api/oauth2/authorize?client_id=%s&permissions=0&redirect_uri=https://birbmc.com&scope=bot", r.User.ID)
}
}
func commandHandler(cfg *config.Config, db *database.Database) func(s *discordgo.Session, m *discordgo.MessageCreate) {
return func(s *discordgo.Session, m *discordgo.MessageCreate) {
// Ignore bots
if m.Author.Bot {
return
}
// Check prefix
if !strings.HasPrefix(m.Content, cfg.Prefix) {
return
}
content := m.Content[1:]
args := strings.Fields(content)
if len(args) == 0 {
return
}
cmdArg := strings.ToLower(args[0])
cmd, ok := commands[cmdArg]
if !ok {
return
}
cmdInit := commandInit{
session: s,
message: m.Message,
config: cfg,
database: db,
}
if !cmd.validate(cmdInit) {
sendMessage(s, m.ChannelID, "You cannot run this command.")
return
}
feedback, err := cmd.run(cmdInit)
if err != nil {
feedback = "Internal error"
beaver.Errorf("error while running %s: %v", cmdArg, err)
}
if len(feedback) > 0 {
sendMessage(s, m.ChannelID, feedback)
}
}
}
func messageHandler(cfg *config.Config, db *database.Database) func(s *discordgo.Session, m *discordgo.MessageCreate) {
return func(s *discordgo.Session, m *discordgo.MessageCreate) {
// Ignore bots
if m.Author.Bot {
return
}
// [FIRED] increment
for _, role := range m.MentionRoles {
if cfg.FiredRole == role {
if err := db.IncrementPing(cfg.FiredRole); err != nil {
beaver.Errorf("could not increment ping for %s: %v", cfg.FiredRole, err)
}
}
}
}
}
func reactionAddHandler() func(s *discordgo.Session, m *discordgo.MessageReactionAdd) {
return func(s *discordgo.Session, m *discordgo.MessageReactionAdd) {
reactionHandler(true, s, m.MessageReaction)
}
}
func reactionRemoveHandler() func(s *discordgo.Session, m *discordgo.MessageReactionRemove) {
return func(s *discordgo.Session, m *discordgo.MessageReactionRemove) {
reactionHandler(false, s, m.MessageReaction)
}
}
func reactionHandler(add bool, s *discordgo.Session, m *discordgo.MessageReaction) {
if _, ok := messageRoleMap[m.MessageID]; ok {
if r, ok := messageRoleMap[m.MessageID][m.Emoji.APIName()]; ok {
var roleCmd func(guildID, userID, roleID string) (err error)
if add {
roleCmd = s.GuildMemberRoleAdd
} else {
roleCmd = s.GuildMemberRoleRemove
}
if err := roleCmd(m.GuildID, m.UserID, r); err != nil {
beaver.Errorf("could not modify role %s for user %s", r, m.UserID)
}
}
}
}