func FetchFile(w http.ResponseWriter, r *http.Request, cfg config.Configuration, ctx model.Context) {
// 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)
err = f.DetectMIME()
if err != nil {
ctx.Log.Println("Unable to detect MIME: ", err)
} else {
ctx.Log.Println("MIME detected: " + f.MIME)
}
if f.MediaType() == "image" {
width, _ := strconv.Atoi(queryParams.Get("width"))
height, _ := strconv.Atoi(queryParams.Get("height"))
if (width > 0) || (height > 0) {
ctx.Log.Println("Size requested: " +
strconv.Itoa(width) + "x" +
strconv.Itoa(height) + " px")
if f.ImageExists(width, height) {
path = f.ImagePath(width, height)
} else {
http.Error(w, "Image not found", 404)
return
}
}
}
w.Header().Set("Vary", "Content-Type")
w.Header().Set("Cache-Control", "s-maxage=3600")
http.ServeFile(w, r, path)
}