sync: fix hash computation by factorizing

admin/sync/exercice_keys.go

@@ -110,7 +110,11 @@ func buildKeyFlag(exercice fic.Exercice, flag ExerciceFlag, flagline int, defaul
 		errs = append(errs, fmt.Sprintf("%q: WARNING flag #%d: non-printable characters in flag, is this really expected?", path.Base(exercice.Path), flagline))
 	}
 
-	hashedFlag := fic.ComputeHashedFlag([]byte(raw))
+	hashedFlag, err := fic.ComputeHashedFlag([]byte(raw), !flag.CaseSensitive, validatorRegexp(flag.ValidatorRe))
+	if err != nil {
+		errs = append(errs, err.Error())
+		return
+	}
 	fl := fic.Flag(fic.FlagKey{
 		IdExercice:      exercice.Id,
 		Label:           flag.Label,

libfic/flag_key.go

@@ -68,9 +68,25 @@ func (e Exercice) GetFlagKeyByLabel(label string) (k FlagKey, err error) {
 }
 
 // ComputeHashedFlag calculates the expected checksum for the given raw_value.
-func ComputeHashedFlag(raw_value []byte) [blake2b.Size]byte {
-	hash := blake2b.Sum512(raw_value)
-	return hash
+func ComputeHashedFlag(raw_value []byte, ignorecase bool, validator_regexp *string) (hash [blake2b.Size]byte, err error) {
+	if ignorecase {
+		raw_value = bytes.ToLower(raw_value)
+	}
+
+	// Check that raw value passes through the regexp
+	if validator_regexp != nil {
+		if raw_value, err = ExecValidatorRegexp(*validator_regexp, raw_value, ignorecase); err != nil {
+			return
+		}
+	}
+
+	// Check that the value is not empty
+	if len(raw_value) == 0 {
+		err = errors.New("Empty flag after applying filters")
+	}
+
+	hash = blake2b.Sum512(raw_value)
+	return
 }
 
 func ExecValidatorRegexp(vre string, val []byte, ignorecase bool) ([]byte, error) {
@@ -88,19 +104,11 @@ func ExecValidatorRegexp(vre string, val []byte, ignorecase bool) ([]byte, error
 
 // AddRawFlagKey creates and fills a new struct FlagKey, from a non-hashed flag, and registers it into the database.
 func (e Exercice) AddRawFlagKey(name string, help string, ignorecase bool, validator_regexp *string, raw_value []byte, choicescost int64) (f FlagKey, err error) {
-	if ignorecase {
-		raw_value = bytes.ToLower(raw_value)
+	hash, errr := ComputeHashedFlag(raw_value, ignorecase, validator_regexp)
+	if errr != nil {
+		return f, err
 	}
 
-	// Check that raw value passes through the regexp
-	if validator_regexp != nil {
-		if raw_value, err = ExecValidatorRegexp(*validator_regexp, raw_value, ignorecase); err != nil {
-			return
-		}
-	}
-
-	hash := ComputeHashedFlag(raw_value)
-
 	f = FlagKey{
 		Label:           name,
 		Help:            help,
@@ -139,26 +147,10 @@ func (k FlagKey) Create(e Exercice) (Flag, error) {
 	}
 }
 
-// SetChecksumFromValue .
-func (k FlagKey) ComputeChecksum(val []byte) (cksum []byte, err error) {
-	if k.IgnoreCase {
-		val = bytes.ToLower(val)
-	}
-
-	// Check that raw value passes through the regexp
-	if k.ValidatorRegexp != nil {
-		if val, err = ExecValidatorRegexp(*k.ValidatorRegexp, val, k.IgnoreCase); err != nil {
-			return
-		}
-	}
-
-	// Check that the value is not empty
-	if len(val) == 0 {
-		err = errors.New("Empty flag after applying filters")
-	}
-
-	hash := ComputeHashedFlag(val)
-	return hash[:], err
+// ComputeChecksum calculates the checksum for a given value.
+func (k FlagKey) ComputeChecksum(val []byte) ([]byte, error) {
+	cksum, err := ComputeHashedFlag(val, k.IgnoreCase, k.ValidatorRegexp)
+	return cksum[:], err
 }
 
 // Update applies modifications back to the database.

libfic/team_my.go

@@ -296,7 +296,7 @@ func MyJSONTeam(t *Team, started bool) (interface{}, error) {
 						}
 
 						if t == nil {
-							h := ComputeHashedFlag([]byte(soluce))
+							h, _ := ComputeHashedFlag([]byte(soluce), false, nil)
 							m.Soluce = hex.EncodeToString(h[:])
 						}