func (ud *urlDriver) Shorten(u *urls.Url) error {
u.Shortened = ud.Encode(u.Url)
if _, err := ud.Upsert(bson.M{"url": u.Url}, u); err != nil {
return err
}
return nil
}
func (ud *urlDriver) Cache(u *urls.Url) error {
for _, s := range badUrlStrings {
if strings.Index(u.Url, s) != -1 {
return fmt.Errorf("Url contains bad substring '%s'.", s)
}
}
res, err := http.Get(u.Url)
if err != nil {
return err
}
defer res.Body.Close()
if res.StatusCode != 200 {
return fmt.Errorf("Received non-200 response '%s' from server.",
res.Status)
}
// 1 << 22 == 4MB
if res.ContentLength > 1<<22 {
return fmt.Errorf("Response too large (%d MB) to cache safely.",
res.ContentLength/1024/1024)
}
u.CachedAs = ud.Encode(u.Url)
fh, err := os.OpenFile(util.JoinPath(*urlCacheDir, u.CachedAs),
os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.FileMode(0600))
defer fh.Close()
if err != nil {
return err
}
if _, err := io.Copy(fh, res.Body); err != nil {
return err
}
u.CacheTime = time.Now()
u.MimeType = res.Header.Get("Content-Type")
if _, err := ud.Upsert(bson.M{"url": u.Url}, u); err != nil {
return err
}
return nil
}