package nuke import ( "fmt" "regexp" "strings" "sync" "time" "github.com/go-irc/irc" "github.com/pkg/errors" log "github.com/sirupsen/logrus" "github.com/Luzifer/go_helpers/v2/str" "github.com/Luzifer/twitch-bot/pkg/twitch" "github.com/Luzifer/twitch-bot/plugins" ) const ( actorName = "nuke" storeRetentionTime = 10 * time.Minute ) var ( formatMessage plugins.MsgFormatter messageStore = map[string][]*storedMessage{} messageStoreLock sync.RWMutex ptrStringDelete = func(v string) *string { return &v }("delete") ptrString10m = func(v string) *string { return &v }("10m") ) func Register(args plugins.RegistrationArguments) error { formatMessage = args.FormatMessage args.RegisterActor(actorName, func() plugins.Actor { return &actor{} }) args.RegisterActorDocumentation(plugins.ActionDocumentation{ Description: "Mass ban, delete, or timeout messages based on regex. Be sure you REALLY know what you do before using this! Used wrongly this will cause a lot of damage!", Name: "Nuke Chat", Type: actorName, Fields: []plugins.ActionDocumentationField{ { Default: "10m", Description: "How long to scan into the past, template must yield a duration (max 10m)", Key: "scan", Name: "Scan-Duration", Optional: true, SupportTemplate: true, Type: plugins.ActionDocumentationFieldTypeString, }, { Default: "delete", Description: "What action to take when message matches (delete / ban / )", Key: "action", Name: "Match-Action", Optional: true, SupportTemplate: true, Type: plugins.ActionDocumentationFieldTypeString, }, { Default: "", Description: "Regular expression (RE2) to select matching messages", Key: "match", Name: "Message-Match", Optional: false, SupportTemplate: true, Type: plugins.ActionDocumentationFieldTypeString, }, }, }) if _, err := args.RegisterCron("@every 1m", cleanupMessageStore); err != nil { return errors.Wrap(err, "registering cleanup cron") } if err := args.RegisterRawMessageHandler(rawMessageHandler); err != nil { return errors.Wrap(err, "registering raw message handler") } return nil } func cleanupMessageStore() { messageStoreLock.Lock() defer messageStoreLock.Unlock() var storeDeletes []string for ch, msgs := range messageStore { var idx int for idx = 0; idx < len(msgs); idx++ { if time.Since(msgs[idx].Time) < storeRetentionTime { break } } newMsgs := msgs[idx:] if len(newMsgs) == 0 { storeDeletes = append(storeDeletes, ch) continue } messageStore[ch] = newMsgs log.WithFields(log.Fields{ "channel": ch, "stored_messages": len(newMsgs), }).Trace("[nuke] Cleared old stored messages") } for _, ch := range storeDeletes { delete(messageStore, ch) log.WithFields(log.Fields{ "channel": ch, }).Trace("[nuke] Channel is no longer stored") } } func rawMessageHandler(m *irc.Message) error { if m.Command != "PRIVMSG" { // We care only about user written messages and drop the rest return nil } messageStoreLock.Lock() defer messageStoreLock.Unlock() messageStore[plugins.DeriveChannel(m, nil)] = append( messageStore[plugins.DeriveChannel(m, nil)], &storedMessage{Time: time.Now(), Msg: m}, ) return nil } type ( actor struct{} storedMessage struct { Time time.Time Msg *irc.Message } ) func (a actor) Execute(c *irc.Client, m *irc.Message, r *plugins.Rule, eventData *plugins.FieldCollection, attrs *plugins.FieldCollection) (preventCooldown bool, err error) { rawMatch, err := formatMessage(attrs.MustString("match", nil), m, r, eventData) if err != nil { return false, errors.Wrap(err, "formatting match") } match := regexp.MustCompile(rawMatch) rawScan, err := formatMessage(attrs.MustString("scan", ptrString10m), m, r, eventData) if err != nil { return false, errors.Wrap(err, "formatting scan duration") } scan, err := time.ParseDuration(rawScan) if err != nil { return false, errors.Wrap(err, "parsing scan duration") } scanTime := time.Now().Add(-scan) var action string rawAction, err := formatMessage(attrs.MustString("action", ptrStringDelete), m, r, eventData) if err != nil { return false, errors.Wrap(err, "formatting action") } switch rawAction { case "delete": action = "/delete $msgid" case "ban": action = `/ban $user Nuke issued for "$match"` default: to, err := time.ParseDuration(rawAction) if err != nil { return false, errors.Wrap(err, "parsing action duration") } action = fmt.Sprintf(`/timeout $user %d Nuke issued for "$match"`, to/time.Second) } channel := plugins.DeriveChannel(m, eventData) messageStoreLock.RLock() defer messageStoreLock.RUnlock() var executedEnforcement []string for _, stMsg := range messageStore[channel] { badges := twitch.ParseBadgeLevels(stMsg.Msg) if stMsg.Time.Before(scanTime) { continue } if badges.Has("broadcaster") || badges.Has("moderator") { continue } if !match.MatchString(stMsg.Msg.Trailing()) { continue } enforcement := strings.NewReplacer( "$match", rawMatch, "$msgid", string(stMsg.Msg.Tags["id"]), "$user", plugins.DeriveUser(stMsg.Msg, nil), ).Replace(action) if str.StringInSlice(enforcement, executedEnforcement) { continue } if err = c.WriteMessage(&irc.Message{ Command: "PRIVMSG", Params: []string{ channel, enforcement, }, }); err != nil { return false, errors.Wrap(err, "sending action") } executedEnforcement = append(executedEnforcement, enforcement) } return false, nil } func (a actor) IsAsync() bool { return false } func (a actor) Name() string { return actorName } func (a actor) Validate(attrs *plugins.FieldCollection) (err error) { if v, err := attrs.String("match"); err != nil || v == "" { return errors.New("match must be non-empty string") } return nil }