add to automod

automod/rules/all.go

@@ -20,6 +20,7 @@ func DefaultRules() automod.RuleSet {
 			ReplySingleBadWordPostRule,
 			AggressivePromotionRule,
 			IdenticalReplyPostRule,
+			IdenticalReplyPostSameParentRule,
 			DistinctMentionsRule,
 			YoungAccountDistinctMentionsRule,
 			MisleadingLinkUnicodeReversalPostRule,

automod/rules/replies.go

@@ -78,6 +78,39 @@ func IdenticalReplyPostRule(c *automod.RecordContext, post *appbsky.FeedPost) er
 	return nil
 }
 
+// Similar to above rule but only counts replies to the same post. More aggressively applies a spam label to new accounts that are less than a day old.
+var identicalReplySameParentLimit = 3
+var identicalReplySameParentSpamLabel = 24 * time.Hour
+var _ automod.PostRuleFunc = IdenticalReplyPostSameParentRule
+
+func IdenticalReplyPostSameParentRule(c *automod.RecordContext, post *appbsky.FeedPost) error {
+	if post.Reply == nil || IsSelfThread(c, post) {
+		return nil
+	}
+
+	if ParentOrRootIsFollower(c, post) {
+		return nil
+	}
+
+	period := countstore.PeriodDay
+	bucket := c.Account.Identity.DID.String() + "/" + post.Reply.Parent.Uri + "/" + HashOfString(post.Text)
+	c.IncrementPeriod("reply-text-same-post", bucket, period)
+
+	count := c.GetCount("reply-text-same-post", bucket, period)
+	if count >= identicalReplySameParentLimit {
+		// if account is young, add spam label. otherwise just report.
+		createdAt := c.Account.CreatedAt
+		c.AddAccountFlag("multi-identical-reply-same-post")
+		c.ReportAccount(automod.ReportReasonSpam, fmt.Sprintf("possible spam (%d identical reply-posts to same post today)", count))
+		if time.Since(*createdAt) < identicalReplySameParentSpamLabel {
+			c.AddAccountLabel("spam")
+		}
+		c.Notify("slack")
+	}
+
+	return nil
+}
+
 // TODO: bumping temporarily
 // var youngReplyAccountLimit = 12
 var youngReplyAccountLimit = 30