backend: Don't consider non error in MCQ as good response

libfic/exercice.go

@@ -463,10 +463,11 @@ func (e *Exercice) CheckResponse(cksum []byte, respflags map[int]string, respmcq
 		// Validate MCQs if no error
 		if valid {
 			for _, mcq := range mcqs {
-				mcq.FoundBy(t)
+				if mcq.FoundBy(t) == nil {
 					goodResponses += 1
 				}
 			}
+		}
 
 		// Check flags
 		for _, flag := range flags {

libfic/flag.go

@@ -13,7 +13,7 @@ type Flag interface {
 	GetOrder() int8
 	Check(val interface{}) int
 	IsOptionnal() bool
-	FoundBy(t *Team)
+	FoundBy(t *Team) error
 }
 
 // GetFlag returns a list of flags comming with the challenge.

libfic/flag_key.go

@@ -335,8 +335,9 @@ func (k *FlagKey) Check(v interface{}) int {
 }
 
 // FoundBy registers in the database that the given Team solved the flag.
-func (k *FlagKey) FoundBy(t *Team) {
-	DBExec("INSERT INTO flag_found (id_flag, id_team, time) VALUES (?, ?, ?)", k.Id, t.Id, time.Now())
+func (k *FlagKey) FoundBy(t *Team) (err error) {
+	_, err = DBExec("INSERT INTO flag_found (id_flag, id_team, time) VALUES (?, ?, ?)", k.Id, t.Id, time.Now())
+	return
 }
 
 // GetExercice returns the parent Exercice where this flag can be found.

libfic/flag_label.go

@@ -178,7 +178,8 @@ func (k *FlagLabel) Check(v interface{}) int {
 }
 
 // FoundBy registers in the database that the given Team solved the flag.
-func (k *FlagLabel) FoundBy(t *Team) {
+func (k *FlagLabel) FoundBy(t *Team) error {
+	return nil
 }
 
 // GetExercice returns the parent Exercice where this flag can be found.

libfic/mcq.go

@@ -341,6 +341,7 @@ func (m *MCQ) Check(v interface{}) int {
 }
 
 // FoundBy registers in the database that the given Team solved the MCQ.
-func (m *MCQ) FoundBy(t *Team) {
-	DBExec("INSERT INTO mcq_found (id_mcq, id_team, time) VALUES (?, ?, ?)", m.Id, t.Id, time.Now())
+func (m *MCQ) FoundBy(t *Team) (err error) {
+	_, err = DBExec("INSERT INTO mcq_found (id_mcq, id_team, time) VALUES (?, ?, ?)", m.Id, t.Id, time.Now())
+	return
 }