func FetchFile(w http.ResponseWriter, r *http.Request, cfg config.Configuration, ctx model.Context) {
var err error
// Query parameters
u, err := url.Parse(r.RequestURI)
if err != nil {
ctx.Log.Println(err)
}
queryParams, err := url.ParseQuery(u.RawQuery)
if err != nil {
ctx.Log.Println(err)
}
// Request headers
params := mux.Vars(r)
f := model.File{}
f.SetFilename(params["filename"])
if err != nil {
ctx.Log.Println(err)
http.Error(w, "Invalid filename specified. It contains illegal characters or is too short.", 400)
return
}
err = f.SetTag(params["tag"])
if err != nil {
ctx.Log.Println(err)
http.Error(w, "Invalid tag specified. It contains illegal characters or is too short.", 400)
return
}
f.SetTagDir(cfg.Filedir)
t := model.Tag{}
t.SetTag(f.Tag)
t.SetTagDir(cfg.Filedir)
t.CalculateExpiration(cfg.Expiration)
expired, err := t.IsExpired(cfg.Expiration)
if err != nil {
ctx.Log.Println(err)
http.Error(w, "Internal Server Error", 500)
return
}
if expired {
ctx.Log.Println("Expired: " + t.ExpirationReadable)
http.Error(w, "This tag has expired.", 410)
return
}
// Default path
path := filepath.Join(f.TagDir, f.Filename)
for param, values := range queryParams {
if param == "size" && values[0] == "thumbnail" {
if f.ThumbnailExists() {
path = f.ThumbnailPath()
} else {
http.Error(w, "Thumbnail not found", 404)
return
}
}
}
w.Header().Set("Cache-Control", "max-age=1")
http.ServeFile(w, r, path)
}