Code

README.md

@@ -1,2 +1,15 @@
 # irc_bot
 
+About a cats
+
+```go
+go build
+```
+
+```sh
+export CTF2021NICK="HaX0r666"
+export CTF2021PASS="passw0rd"
+export CTF2021URL="localhost:6667"
+./ctf2021_ircbot
+```
+

go.mod

@@ -0,0 +1,8 @@
+module github.com/Difrex/ctf2021_ircbot
+
+go 1.15
+
+require (
+	github.com/go-chat-bot/plugins v0.0.0-20201024114236-00ff43fcf77f
+	github.com/thoj/go-ircevent v0.0.0-20190807115034-8e7ce4b5a1eb
+)

go.sum

@@ -0,0 +1,7 @@
+github.com/go-chat-bot/plugins v0.0.0-20201024114236-00ff43fcf77f h1:To58XdIp+Sw9QoyhJE3oh2KMZKoj4Ta8W/ltrA+cL68=
+github.com/go-chat-bot/plugins v0.0.0-20201024114236-00ff43fcf77f/go.mod h1:Ga63x4EC4NFYr/KGzhn8D8fLj89sfJA/dpBsuowiHOQ=
+github.com/thoj/go-ircevent v0.0.0-20190807115034-8e7ce4b5a1eb h1:EavwSqheIJl3nb91HhkL73DwnT2Fk8W3yM7T7TuLZvA=
+github.com/thoj/go-ircevent v0.0.0-20190807115034-8e7ce4b5a1eb/go.mod h1:I0ZT9x8wStY6VOxtNOrLpnDURFs7HS0z1e1vhuKUEVc=
+golang.org/x/text v0.3.2 h1:tW2bmiBqwgJj/UpqtC8EpXEZVYOwU0yG4iWbprSVAcs=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

main.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"regexp"
+
+	"github.com/go-chat-bot/plugins/web"
+	irc "github.com/thoj/go-ircevent"
+)
+
+const channel = "#ctf"
+
+const (
+	pattern   = "(?i)\\b(cat|gato|miau|meow|garfield|lolcat)[s|z]{0,1}\\b"
+	msgPrefix = "[BOT] I love cats! Here's a fact: %s"
+)
+
+type catFact struct {
+	Fact   string `json:"fact"`
+	Length int    `json:"length"`
+}
+
+var (
+	re          = regexp.MustCompile(pattern)
+	catFactsURL = "http://catfact.ninja/fact"
+)
+
+func main() {
+	nick := os.Getenv("CTF2021NICK")
+	irccon := irc.IRC(nick, nick)
+
+	irccon.VerboseCallbackHandler = false
+	irccon.Debug = false
+	irccon.UseTLS = false
+
+	irccon.AddCallback("001", func(e *irc.Event) {
+		log.Println("Welcome message:", e.Message())
+
+		e.Connection.Privmsg("nickserv", "identify "+os.Getenv("CTF2021PASS"))
+
+		e.Connection.Join(channel)
+		e.Connection.Privmsg(channel, `[BOT] I'm a cat facts bot!`)
+		e.Connection.Privmsg(channel, `[BOT] Inspired from https://github.com/go-chat-bot/plugins/blob/master/catfacts/catfacts.go`)
+		e.Connection.Privmsg(channel, `[BOT] Try cat /etc/passwd ^_^`)
+		e.Connection.Privmsg(channel, `[BOT] Source code and issue tracker: https://gitea.difrex.ru/CTF2021/irc_bot`)
+	})
+
+	irccon.AddCallback("PRIVMSG", func(e *irc.Event) {
+		log.Printf("Message from %s received: %s", e.Nick, e.Message())
+		catFacts(e.Message(), e.Connection)
+	})
+
+	irccon.AddCallback("", func(e *irc.Event) {})
+	err := irccon.Connect(os.Getenv("CTF2021URL"))
+	if err != nil {
+		fmt.Printf("Err %s", err)
+		return
+	}
+	irccon.Loop()
+}
+
+func catFacts(command string, con *irc.Connection) (string, error) {
+	if !re.MatchString(command) {
+		return "", nil
+	}
+	data := &catFact{}
+	err := web.GetJSON(catFactsURL, data)
+	if err != nil {
+		return "", err
+	}
+
+	if len(data.Fact) == 0 {
+		return "", nil
+	}
+
+	con.Privmsg(channel, fmt.Sprintf(msgPrefix, data.Fact))
+	return fmt.Sprintf(msgPrefix, data.Fact), nil
+}