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// Copyright 2016 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package types
import (
"errors"
"net/url"
"github.com/vincent-petithory/dataurl"
)
var (
ErrInvalidScheme = errors.New("invalid url scheme")
)
func validateURL(s string) error {
// Empty url is valid, indicates an empty file
if s == "" {
return nil
}
u, err := url.Parse(s)
if err != nil {
return err
}
switch u.Scheme {
case "http", "https", "oem":
return nil
case "data":
if _, err := dataurl.DecodeString(s); err != nil {
return err
}
return nil
default:
return ErrInvalidScheme
}
}
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