server/checker/choices.go

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package main
import (
"encoding/base64"
"encoding/binary"
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"encoding/json"
"io/ioutil"
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"log"
"math/rand"
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"os"
"srs.epita.fr/fic-server/libfic"
)
type wantChoices struct {
FlagId int `json:"id"`
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}
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func treatWantChoices(pathname string, team *fic.Team) {
// Generate a unique identifier to follow the request in logs
bid := make([]byte, 5)
binary.LittleEndian.PutUint32(bid, rand.Uint32())
id := "[" + base64.StdEncoding.EncodeToString(bid) + "]"
log.Println(id, "New wantChoices receive", pathname)
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var ask wantChoices
cnt_raw, err := ioutil.ReadFile(pathname)
if err != nil {
log.Printf("%s [ERR] %s\n", id, err)
return
}
err = json.Unmarshal(cnt_raw, &ask)
if err != nil {
log.Printf("%s [ERR] %s\n", id, err)
return
}
if ask.FlagId == 0 {
log.Printf("%s [WRN] Invalid content in wantChoices file: %s\n", id, pathname)
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os.Remove(pathname)
return
}
flag, err := fic.GetFlagKey(ask.FlagId)
if err != nil {
log.Printf("%s [ERR] %s\n", id, err)
return
}
if !team.CanSeeFlag(flag) {
log.Printf("%s [!!!] The team asks to display choices whereas it doesn't have access to the flag\n", id)
return
}
exercice, err := flag.GetExercice()
if err != nil {
log.Printf("%s [ERR] Unable to retrieve the flag's underlying exercice: %s\n", id, err)
return
}
if !team.HasAccess(exercice) {
log.Printf("%s [!!!] The team asks to display choices whereas it doesn't have access to the exercice\n", id)
return
}
if exercice.Disabled {
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log.Println("[!!!] The team submits something for a disabled exercice")
return
}
if exercice.IdTheme != nil {
theme, err := fic.GetTheme(*exercice.IdTheme)
if err != nil {
log.Printf("%s [ERR] Unable to retrieve theme for exercice %d: %s\n", id, exercice.Id, err)
return
}
// Theme should not be locked
if theme.Locked {
log.Printf("%s [!!!] Want choice received for locked theme %d (fid=%d): %s\n", id, exercice.IdTheme, ask.FlagId, theme.Name)
return
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}
}
err = team.DisplayChoices(flag)
if err != nil {
log.Printf("%s [ERR] %s\n", id, err)
return
}
appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenTeam, TeamId: team.Id})
if err = os.Remove(pathname); err != nil {
log.Printf("%s [ERR] %s\n", id, err)
}
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}