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main.go
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main.go
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package main
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"os"
"time"
"github.com/sirupsen/logrus"
"github.com/spf13/pflag"
)
type RctfClient struct {
url url.URL
token string
}
type Challenge struct {
ID string `json:"id"`
Name string `json:"name"`
Solves int `json:"solves"`
}
type apiResponse struct {
Kind string `json:"kind"`
Message string `json:"message"`
Data json.RawMessage `json:"data"`
}
type userInfo struct {
ID string
Name string
}
type reqAuthLoginBody struct {
TeamToken string `json:"teamToken"`
}
type respGoodLogin struct {
AuthToken string `json:"authToken"`
}
type respGoodChallenges []Challenge
type respGoodChallengeSolves struct {
Solves []struct {
UserID string `json:"userId"`
UserName string `json:"userName"`
} `json:"solves"`
}
type responseError = apiResponse
func (e *responseError) Error() string {
return e.Kind + ": " + e.Message
}
func parseResponse(resp *http.Response, expectedKind string, data interface{}) error {
var apiResp apiResponse
if err := json.NewDecoder(resp.Body).Decode(&apiResp); err != nil {
return err
}
if apiResp.Kind != expectedKind {
err := responseError(apiResp)
return &err
}
if data != nil {
if err := json.Unmarshal(apiResp.Data, data); err != nil {
return err
}
}
return nil
}
func (c *RctfClient) Login(token string) error {
epURL, err := url.Parse("api/v1/auth/login")
if err != nil {
panic(err)
}
reqBody, err := json.Marshal(reqAuthLoginBody{
TeamToken: token,
})
if err != nil {
panic(err)
}
r, err := http.Post(c.url.ResolveReference(epURL).String(), "application/json", bytes.NewBuffer(reqBody))
if err != nil {
return err
}
var resp respGoodLogin
if err := parseResponse(r, "goodLogin", &resp); err != nil {
return err
}
c.token = resp.AuthToken
return nil
}
func (c *RctfClient) ChallGetBlooder(id string) userInfo {
epURL, err := url.Parse(fmt.Sprintf("api/v1/challs/%s/solves?limit=1&offset=0", url.QueryEscape(id)))
if err != nil {
panic(err)
}
r, err := http.Get(c.url.ResolveReference(epURL).String())
if err != nil {
panic(err)
}
var resp respGoodChallengeSolves
if err := parseResponse(r, "goodChallengeSolves", &resp); err != nil {
panic(err)
}
solves := resp.Solves
if len(solves) > 0 {
return userInfo{
ID: solves[0].UserID,
Name: solves[0].UserName,
}
} else {
return userInfo{}
}
}
func (c *RctfClient) GetChalls() []Challenge {
epURL, err := url.Parse("api/v1/challs")
if err != nil {
panic(err)
}
req, err := http.NewRequest("GET", c.url.ResolveReference(epURL).String(), nil)
if err != nil {
panic(err)
}
req.Header.Set("Authorization", fmt.Sprintf("Bearer %s", c.token))
r, err := http.DefaultClient.Do(req)
if err != nil {
panic(err)
}
var resp respGoodChallenges
if err := parseResponse(r, "goodChallenges", &resp); err != nil {
var respErr *responseError
if errors.As(err, &respErr) && respErr.Kind == "badNotStarted" {
return []Challenge{}
}
panic(err)
}
return resp
}
type WatcherOptions struct {
RctfURL string
Token string
DiscordWebhook string
}
type Watcher struct {
rctfClient RctfClient
solvedChallenges map[string]struct{}
discordWebhook string
}
func NewWatcher(options WatcherOptions) Watcher {
url, err := url.Parse(options.RctfURL)
if err != nil {
panic(err)
}
client := RctfClient{
url: *url,
}
client.Login(options.Token)
solvedChallenges := make(map[string]struct{})
challs := client.GetChalls()
for _, chall := range challs {
if chall.Solves > 0 {
solvedChallenges[chall.ID] = struct{}{}
}
}
return Watcher{
rctfClient: client,
solvedChallenges: solvedChallenges,
discordWebhook: options.DiscordWebhook,
}
}
type DiscordWebhookPayloadEmbed struct {
Author struct {
Name string `json:"name"`
URL string `json:"url"`
IconURL string `json:"icon_url"`
} `json:"author"`
Title string `json:"title"`
URL string `json:"url"`
Description string `json:"description"`
Color int `json:"color"`
Fields []struct {
Name string `json:"name"`
Value string `json:"value"`
Inline bool `json:"inline,omitempty"`
} `json:"fields"`
Thumbnail struct {
URL string `json:"url"`
} `json:"thumbnail"`
Image struct {
URL string `json:"url"`
} `json:"image"`
Footer struct {
Text string `json:"text"`
IconURL string `json:"icon_url"`
} `json:"footer"`
}
type DiscordWebhookPayloadAllowedMentions struct {
Parse []string `json:"parse"`
Roles []string `json:"roles"`
Users []string `json:"users"`
RepliedUser bool `json:"replied_user"`
}
type DiscordWebhookPayload struct {
Content string `json:"content"`
Username string `json:"username"`
AvatarURL string `json:"avatar_url"`
TTS bool `json:"tts"`
Embeds []DiscordWebhookPayloadEmbed `json:"embeds"`
AllowedMentions DiscordWebhookPayloadAllowedMentions `json:"allowed_mentions"`
}
func (w *Watcher) notify(chall Challenge) {
solver := w.rctfClient.ChallGetBlooder(chall.ID)
profileRelURL, err := url.Parse(fmt.Sprintf("profile/%s", solver.ID))
if err != nil {
panic(err)
}
solverProfileURL := w.rctfClient.url.ResolveReference(profileRelURL)
payload := DiscordWebhookPayload{
Content: fmt.Sprintf(
"Congratulations to [%s](<%s>) for first :drop_of_blood: on %s!",
solver.Name, solverProfileURL.String(), chall.Name,
),
AllowedMentions: DiscordWebhookPayloadAllowedMentions{
Parse: []string{},
},
}
payloadBytes, err := json.Marshal(payload)
if err != nil {
panic(err)
}
http.Post(w.discordWebhook, "application/json", bytes.NewBuffer(payloadBytes))
}
func (w *Watcher) Check() {
challs := w.rctfClient.GetChalls()
for _, chall := range challs {
if chall.Solves > 0 {
if _, ok := w.solvedChallenges[chall.ID]; !ok {
go w.notify(chall)
w.solvedChallenges[chall.ID] = struct{}{}
}
}
}
}
func main() {
rctfURL := pflag.String("rctf-url", os.Getenv("RCTF_URL"), "url of rCTF instance to monitor")
token := pflag.String("token", os.Getenv("RCTF_TOKEN"), "rCTF token to fetch challenges with")
discordWebhook := pflag.String("discord-webhook", os.Getenv("DISCORD_WEBHOOK"), "discord webhook to post to")
intervalStr := pflag.String("interval", "1m", "interval to check")
pflag.Parse()
if *rctfURL == "" {
panic("--rctf-url is required")
}
if *token == "" {
panic("--token is required")
}
if *discordWebhook == "" {
panic("--discord-webhook is required")
}
interval, err := time.ParseDuration(*intervalStr)
if err != nil {
panic(err)
}
watcher := NewWatcher(WatcherOptions{
RctfURL: *rctfURL,
Token: *token,
DiscordWebhook: *discordWebhook,
})
logrus.Info("Startup complete")
for {
time.Sleep(interval)
logrus.Info("Checking")
watcher.Check()
}
}