func fetchFile(l *log.Logger, f types.File) ([]byte, error) {
switch f.Contents.Source.Scheme {
case "http":
client := util.NewHttpClient(l)
data, status, err := client.Get(f.Contents.Source.String())
if err != nil {
return nil, err
}
l.Debug("GET result: %s", http.StatusText(status))
if status != http.StatusOK {
return nil, ErrStatusBad
}
return data, nil
case "data":
url, err := dataurl.DecodeString(f.Contents.Source.String())
if err != nil {
return nil, err
}
return url.Data, nil
default:
return nil, ErrSchemeUnsupported
}
}
// FetchResource fetches a resource given a URL. The supported schemes are http, data, and oem.
func FetchResource(l *log.Logger, u url.URL) ([]byte, error) {
switch u.Scheme {
case "http", "https":
client := NewHttpClient(l)
data, status, err := client.Get(u.String())
if err != nil {
return nil, err
}
l.Debug("GET result: %s", http.StatusText(status))
switch status {
case http.StatusOK, http.StatusNoContent:
return data, nil
case http.StatusNotFound:
return nil, ErrNotFound
default:
return nil, ErrFailed
}
case "data":
url, err := dataurl.DecodeString(u.String())
if err != nil {
return nil, err
}
return url.Data, nil
case "oem":
path := filepath.Clean(u.Path)
if !filepath.IsAbs(path) {
l.Err("oem path is not absolute: %q", u.Path)
return nil, ErrPathNotAbsolute
}
// check if present under oemDirPath, if so use it.
absPath := filepath.Join(oemDirPath, path)
data, err := ioutil.ReadFile(absPath)
if os.IsNotExist(err) {
l.Info("oem config not found in %q, trying %q",
oemDirPath, oemMountPath)
// try oemMountPath, requires mounting it.
err := mountOEM(l)
if err != nil {
l.Err("failed to mount oem partition: %v", err)
return nil, ErrFailed
}
absPath := filepath.Join(oemMountPath, path)
data, err = ioutil.ReadFile(absPath)
umountOEM(l)
} else if err != nil {
l.Err("failed to read oem config: %v", err)
return nil, ErrFailed
}
return data, nil
default:
return nil, ErrSchemeUnsupported
}
}