nyaa-pantsu/controllers/torrent/download.go

package torrentController

import (
	"fmt"
	"io"
	"os"
	"strconv"
	"strings"

	"github.com/NyaaPantsu/nyaa/config"
	"github.com/NyaaPantsu/nyaa/templates"
	"github.com/NyaaPantsu/nyaa/models/torrents"
	"github.com/NyaaPantsu/nyaa/utils/format"
	"github.com/gin-gonic/gin"
)

// DownloadTorrent : Controller for downloading a torrent
func DownloadTorrent(c *gin.Context) {
	hash := c.Param("hash")

	torrent, err := torrents.FindRawByHash(hash)

	if err != nil {
		//File not found, send 404
		variables := templates.Commonvariables(c)
		templates.Render(c, "errors/torrent_file_missing.jet.html", variables)
		return
	}
	
	if hash == "" && len(config.Get().Torrents.FileStorage) == 0 {
		//File not found, send 404
		variables := templates.Commonvariables(c)
		var trackers []string
		if torrent.Trackers == "" {
			trackers = config.Get().Torrents.Trackers.Default
		} else {
			trackers = torrent.GetTrackersArray()
		}
		magnet := format.InfoHashToMagnet(strings.TrimSpace(torrent.Hash), torrent.Name, trackers...)
		variables.Set("magnet", magnet)
		templates.Render(c, "errors/torrent_file_missing.jet.html", variables)
		return
	}
 
	//Check if file exists and open
	Openfile, err := os.Open(fmt.Sprintf("%s%c%s.torrent", config.Get().Torrents.FileStorage, os.PathSeparator, hash))
	if err != nil {
		//File not found, send 404
		variables := templates.Commonvariables(c)
		var trackers []string
		if torrent.Trackers == "" {
			trackers = config.Get().Torrents.Trackers.Default
		} else {
			trackers = torrent.GetTrackersArray()
		}
		magnet := format.InfoHashToMagnet(strings.TrimSpace(torrent.Hash), torrent.Name, trackers...)
		variables.Set("magnet", magnet)
		templates.Render(c, "errors/torrent_file_missing.jet.html", variables)
		return
	}
	defer Openfile.Close() //Close after function return

	//Get the file size
	FileStat, _ := Openfile.Stat()                     //Get info from file
	FileSize := strconv.FormatInt(FileStat.Size(), 10) //Get file size as a string

	

	c.Header("Content-Disposition", fmt.Sprintf("attachment; filename=\"%s.torrent\"", torrent.Name))
	c.Header("Content-Type", "application/x-bittorrent")
	c.Header("Content-Length", FileSize)
	//Send the file
	// We reset the offset to 0
	Openfile.Seek(0, 0)
	io.Copy(c.Writer, Openfile) //'Copy' the file to the client
}