Fix incorrectly handeling of unknown filetypes

rsaserver.go

@@ -183,17 +183,22 @@ func decryptKeyIV(ed string, privateKey *rsa.PrivateKey) ([]byte, error) {
 func handleDecrypted(decryptedDataB []byte, uidB []byte) {
     data, _ := base64.StdEncoding.DecodeString(strings.TrimSpace(string(decryptedDataB)))
     
-
     fileType, err := magic.Lookup(data)
     if err != nil {
         if err == magic.ErrUnknown {
             fmt.Println("File type is unknown")
-			fileType.Extension = "unk"
         } else {
             panic(err)
         }
     }
     
+    var fileTDef string
+    if fileType != nil {
+        fileTDef = fileType.Extension
+    } else {
+        fileTDef = "unknown"
+    }
+    
     uid := strings.TrimSpace(string(uidB))
     folderPath := fmt.Sprintf("Loot/%s", uid)
     err = createFolderIfNotExists(folderPath)
@@ -202,7 +207,7 @@ func handleDecrypted(decryptedDataB []byte, uidB []byte){
     }
 
     timestamp := time.Now().Unix()
-	filename := fmt.Sprintf("%d.%s", timestamp, fileType.Extension)
+    filename := fmt.Sprintf("%d.%s", timestamp, fileTDef)
     
     filePath := fmt.Sprintf("%s/%s", folderPath, filename)
     fmt.Println(filePath)
@@ -211,9 +216,10 @@ func handleDecrypted(decryptedDataB []byte, uidB []byte){
         panic(err)
     }
 
-	fmt.Printf("Got a %s from %s, saving to %s\n",fileType.Extension,uid,filePath)
+    fmt.Printf("Got a %s from %s, saving to %s\n", fileTDef, uid, filePath)
 }
 
+
 func createFolderIfNotExists(folderPath string) error {
 	_, err := os.Stat(folderPath)
 	if os.IsNotExist(err) {