202 lines
6.6 KiB
Go
202 lines
6.6 KiB
Go
package main
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import (
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"encoding/base64"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"html"
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"io/ioutil"
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"log"
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"math/rand"
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"os"
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"strconv"
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"golang.org/x/crypto/blake2b"
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"srs.epita.fr/fic-server/libfic"
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)
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type ResponsesUpload struct {
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Keys map[int]string `json:"flags"`
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MCQs map[int]bool `json:"mcqs"`
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MCQJ map[int]string `json:"justifications"`
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}
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func treatSubmission(pathname string, team *fic.Team, exercice_id string) {
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// Generate a unique identifier to follow the request in logs
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bid := make([]byte, 5)
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binary.LittleEndian.PutUint32(bid, rand.Uint32())
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id := "[" + base64.StdEncoding.EncodeToString(bid) + "]"
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log.Println(id, "New submission receive", pathname)
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// Parse exercice_id argument
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eid, err := strconv.ParseInt(exercice_id, 10, 64)
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if err != nil {
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log.Printf("%s [ERR] %s is not a valid number: %s\n", id, exercice_id, err)
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return
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}
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// Identifier should not be blacklisted for the team
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if blacklistteam, ok := TeamLockedExercices[team.Id]; ok {
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if locked, ok := blacklistteam[exercice_id]; ok && locked {
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log.Printf("%s [!!!] Submission received for team's locked exercice %d\n", id, eid)
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return
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}
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}
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// Find the given exercice
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exercice, err := fic.GetExercice(eid)
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if err != nil {
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log.Printf("%s [ERR] Unable to find exercice %d: %s\n", id, eid, err)
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return
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}
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// Check the exercice is not disabled
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if exercice.Disabled {
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log.Println("[!!!] The team submits something for a disabled exercice")
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return
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}
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// Check the team can access this exercice
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if !team.HasAccess(exercice) {
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log.Println("[!!!] The team submits something for an exercice it doesn't have access yet")
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return
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}
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// Find the corresponding theme
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var theme *fic.Theme
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if exercice.IdTheme != nil {
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theme, err = fic.GetTheme(*exercice.IdTheme)
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if err != nil {
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log.Printf("%s [ERR] Unable to retrieve theme for exercice %d: %s\n", id, eid, err)
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return
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}
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// Theme should not be locked
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if theme.Locked {
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log.Printf("%s [!!!] Submission received for locked theme %d (eid=%d): %s\n", id, exercice.IdTheme, eid, theme.Name)
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return
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}
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}
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// Read received file
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cnt_raw, err := ioutil.ReadFile(pathname)
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if err != nil {
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log.Println(id, "[ERR] Unable to read file;", err)
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return
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}
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// Save checksum to treat duplicates
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cksum := blake2b.Sum512(cnt_raw)
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if err != nil {
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log.Println(id, "[ERR] JSON parsing error:", err)
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return
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}
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// Parse it
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var responses ResponsesUpload
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err = json.Unmarshal(cnt_raw, &responses)
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if err != nil {
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log.Println(id, "[ERR] JSON parsing error:", err)
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return
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}
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// Ensure the team didn't already solve this exercice
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tm := team.HasSolved(exercice)
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if tm != nil {
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if theme == nil {
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log.Printf("%s [WRN] Team %d ALREADY solved standalone exercice %d (%s), continuing for eventual bonus flags\n", id, team.Id, exercice.Id, exercice.Title)
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} else {
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log.Printf("%s [WRN] Team %d ALREADY solved exercice %d (%s : %s), continuing for eventual bonus flags\n", id, team.Id, exercice.Id, theme.Name, exercice.Title)
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}
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}
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// Handle MCQ justifications: convert to expected keyid
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for cid, j := range responses.MCQJ {
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if mcq, choice, err := fic.GetMCQbyChoice(cid); err != nil {
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log.Println(id, "[ERR] Unable to retrieve mcq from justification:", err)
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return
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} else if mcq.IdExercice != exercice.Id {
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log.Println(id, "[ERR] We retrieve an invalid MCQ: from exercice", mcq.IdExercice, "whereas expected from exercice", exercice.Id)
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return
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} else if key, err := choice.GetJustifiedFlag(exercice); err != nil {
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// Most probably, we enter here because the selected choice has not to be justified
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// So, just ignore this case as it will be invalidated by the mcq validation
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continue
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} else {
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if responses.Keys == nil {
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responses.Keys = map[int]string{}
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}
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responses.Keys[key.Id] = j
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}
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}
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// Check given answers
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solved, err := exercice.CheckResponse(cksum[:], responses.Keys, responses.MCQs, team)
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if err != nil {
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log.Println(id, "[ERR] Unable to CheckResponse:", err)
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appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenTeam, TeamId: team.Id})
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return
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}
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// At this point, we have treated the file, so it can be safely deleted
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if err := os.Remove(pathname); err != nil {
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log.Println(id, "[ERR] Can't remove file:", err)
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}
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if tm != nil {
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appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenTeam, TeamId: team.Id})
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} else if solved {
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if theme == nil {
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log.Printf("%s Team %d SOLVED exercice %d (%s)\n", id, team.Id, exercice.Id, exercice.Title)
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} else {
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log.Printf("%s Team %d SOLVED exercice %d (%s : %s)\n", id, team.Id, exercice.Id, theme.Name, exercice.Title)
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}
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if err := exercice.Solved(team); err != nil {
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log.Println(id, "[ERR] Unable to mark the challenge as solved:", err)
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}
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// Write event
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if theme == nil {
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if _, err := fic.NewEvent(fmt.Sprintf("L'équipe %s a résolu le défi %s !", html.EscapeString(team.Name), exercice.Title), "success"); err != nil {
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log.Println(id, "[WRN] Unable to create event:", err)
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}
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} else {
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if lvl, err := exercice.GetLevel(); err != nil {
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log.Println(id, "[ERR] Unable to get exercice level:", err)
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} else if _, err := fic.NewEvent(fmt.Sprintf("L'équipe %s a résolu le <strong>%d<sup>e</sup></strong> défi %s !", html.EscapeString(team.Name), lvl, theme.Name), "success"); err != nil {
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log.Println(id, "[WRN] Unable to create event:", err)
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}
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}
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appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenTeam, TeamId: team.Id})
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appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenThemes})
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appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenTeams})
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} else {
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if theme == nil {
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log.Printf("%s Team %d submit an invalid solution for exercice %d (%s)\n", id, team.Id, exercice.Id, exercice.Title)
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} else {
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log.Printf("%s Team %d submit an invalid solution for exercice %d (%s : %s)\n", id, team.Id, exercice.Id, theme.Name, exercice.Title)
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}
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// Write event (only on first try)
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if tm == nil {
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if theme == nil {
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if _, err := fic.NewEvent(fmt.Sprintf("L'équipe %s tente le défi %s !", html.EscapeString(team.Name), exercice.Title), "warning"); err != nil {
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log.Println(id, "[WRN] Unable to create event:", err)
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}
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} else {
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if lvl, err := exercice.GetLevel(); err != nil {
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log.Println(id, "[ERR] Unable to get exercice level:", err)
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} else if _, err := fic.NewEvent(fmt.Sprintf("L'équipe %s tente le <strong>%d<sup>e</sup></strong> défi %s !", html.EscapeString(team.Name), lvl, theme.Name), "warning"); err != nil {
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log.Println(id, "[WRN] Unable to create event:", err)
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}
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}
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}
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appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenTeam, TeamId: team.Id})
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}
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appendGenQueue(fic.GenStruct{Id: id, Type: fic.GenEvents})
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}
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