sync: add dependency on flag to download file

libfic/team.go

@@ -1,6 +1,7 @@
 package fic
 
 import (
+	"log"
 	"time"
 )
 
@@ -104,6 +105,25 @@ func (t Team) HasAccess(e Exercice) bool {
 	}
 }
 
+// CanDownload checks if the Team has access to the given file.
+func (t Team) CanDownload(f EFile) bool {
+	if deps, err := f.GetDepends(); err != nil {
+		log.Printf("Unable to retrieve file dependencies: %s\n", err)
+		return false
+	} else {
+		res := true
+
+		for _, dep := range deps {
+			if t.HasPartiallySolved(dep) == nil {
+				res = false
+				break
+			}
+		}
+
+		return res
+	}
+}
+
 // NbTry retrieves the number of attempts made by the Team to the given challenge.
 func NbTry(t *Team, e Exercice) int {
 	var cnt *int