summaryrefslogtreecommitdiff
path: root/flood.go
blob: ae9afaf41c65c8ac57f4a0bd1eed358b24fae099 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
package main

import (
	"log"
	"sort"
	"strings"

	irc "github.com/fluffle/goirc/client"
)

func Flood(s string) bool {
	if s == "" {
		return false
	}
	v := strings.Fields(s)
	if len(v) >= 4 {
		return CommonWord(v) >= len(v)/2 || MedianLength(v) == 1
	}
	return false
}

func CommonWord(v []string) int {
	m := make(map[string]int)
	for _, w := range v {
		m[w]++
	}
	l := make([]int, len(m))
	for _, n := range m {
		l = append(l, n)
	}
	sort.Sort(sort.Reverse(sort.IntSlice(l)))
	return l[0]
}

func MedianLength(v []string) int {
	l := make([]int, len(v))
	for i, s := range v {
		l[i] = len(s)
	}
	sort.Sort(sort.IntSlice(l))
	return l[len(l)/2]
}

func DetectFlood(conn *irc.Conn, line *irc.Line) {
	if Flood(line.Text()) {
		log.Println("flood", line.Nick)
		conn.Kick(*room, line.Nick, "flood")
	}
}