Proper logging

pkg/realdebrid/api.go

@@ -81,7 +81,46 @@ func UnrestrictLink(accessToken, link string) (*UnrestrictResponse, error) {
 		return nil, err
 	}
 
-	return &response, nil
+	if canFetchFirstByte(response.Download) {
+		return &response, nil
+	}
+	return nil, fmt.Errorf("can't fetch first byte")
+}
+
+func canFetchFirstByte(url string) bool {
+	// Create a new HTTP request
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return false
+	}
+
+	// Set the Range header to request only the first byte
+	req.Header.Set("Range", "bytes=0-0")
+
+	// Execute the request
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return false
+	}
+	defer resp.Body.Close()
+
+	// If server supports partial content
+	if resp.StatusCode == http.StatusPartialContent {
+		buffer := make([]byte, 1)
+		_, err := resp.Body.Read(buffer)
+		if err != nil {
+			return false
+		}
+		return true
+	}
+
+	// If server doesn't support partial content, try reading the first byte and immediately close
+	buffer := make([]byte, 1)
+	_, err = io.ReadFull(resp.Body, buffer)
+	if err != nil {
+		return false
+	}
+	return true
 }
 
 // GetTorrents returns all torrents, paginated