hanayo/vendor/github.com/osuripple/cheesegull/api/download/download.go

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2019-02-23 13:29:15 +00:00
// Package download handles the API call to download an osu! beatmap set.
package download
import (
"fmt"
"io"
"log"
"strconv"
"time"
"github.com/osuripple/cheesegull/api"
"github.com/osuripple/cheesegull/downloader"
"github.com/osuripple/cheesegull/housekeeper"
"github.com/osuripple/cheesegull/models"
)
func errorMessage(c *api.Context, code int, err string) {
c.WriteHeader("Content-Type", "text/plain; charset=utf-8")
c.Code(code)
c.Write([]byte(err))
}
func existsQueryKey(c *api.Context, s string) bool {
_, ok := c.Request.URL.Query()[s]
return ok
}
// Download is the handler for a request to download a beatmap
func Download(c *api.Context) {
// get the beatmap ID
id, err := strconv.Atoi(c.Param("id"))
if err != nil {
errorMessage(c, 400, "Malformed ID")
return
}
// fetch beatmap set and make sure it exists.
set, err := models.FetchSet(c.DB, id, false)
if err != nil {
c.Err(err)
errorMessage(c, 500, "Could not fetch set")
return
}
if set == nil {
errorMessage(c, 404, "Set not found")
return
}
// use novideo only when we are requested to get a beatmap having a video
// and novideo is in the request
noVideo := set.HasVideo && existsQueryKey(c, "novideo")
cbm, shouldDownload := c.House.AcquireBeatmap(&housekeeper.CachedBeatmap{
ID: id,
NoVideo: noVideo,
LastUpdate: set.LastUpdate,
})
if shouldDownload {
err := downloadBeatmap(c.DLClient, cbm, c.House)
if err != nil {
c.Err(err)
errorMessage(c, 500, "Internal error")
return
}
} else {
cbm.MustBeDownloaded()
}
cbm.SetLastRequested(time.Now())
if cbm.FileSize() == 0 {
errorMessage(c, 504, "The beatmap could not be downloaded (probably got deleted from the osu! website)")
return
}
f, err := cbm.File()
if err != nil {
c.Err(err)
errorMessage(c, 500, "Internal error")
return
}
defer f.Close()
c.WriteHeader("Content-Type", "application/octet-stream")
c.WriteHeader("Content-Disposition", fmt.Sprintf("attachment; filename=%q", fmt.Sprintf("%d %s - %s.osz", set.ID, set.Artist, set.Title)))
c.WriteHeader("Content-Length", strconv.FormatUint(uint64(cbm.FileSize()), 10))
c.Code(200)
_, err = io.Copy(c, f)
if err != nil {
c.Err(err)
}
}
func downloadBeatmap(c *downloader.Client, b *housekeeper.CachedBeatmap, house *housekeeper.House) error {
log.Println("[⬇️]", b.String())
var fileSize uint64
defer func() {
// We need to wrap this inside a function because this way the arguments
// to DownloadCompleted are actually evaluated during the defer call.
b.DownloadCompleted(fileSize, house)
}()
// Start downloading.
r, err := c.Download(b.ID, b.NoVideo)
if err != nil {
if err == downloader.ErrNoRedirect {
return nil
}
return err
}
defer r.Close()
// open the file we will write the beatmap into
f, err := b.CreateFile()
if err != nil {
return err
}
defer f.Close()
fSizeRaw, err := io.Copy(f, r)
fileSize = uint64(fSizeRaw)
if err != nil {
return err
}
return nil
}
func init() {
api.GET("/d/:id", Download)
}