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sha256.go
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sha256.go
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/*
* Copyright 2018-2020 the original author or authors.
*
* 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
*
* https://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 actions
import (
"crypto/sha256"
"encoding/hex"
"fmt"
"io"
"net/http"
)
type RequestModifierFunc func(request *http.Request) *http.Request
func SHA256FromURI(uri string, mods ...RequestModifierFunc) (string, error) {
req, err := http.NewRequest("GET", uri, nil)
if err != nil {
return "", fmt.Errorf("unable to create GET %s request\n%w", uri, err)
}
for _, m := range mods {
req = m(req)
}
resp, err := http.DefaultClient.Do(req)
if err != nil {
return "", fmt.Errorf("unable to get %s\n%w", uri, err)
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return "", fmt.Errorf("unable to download %s: %d", uri, resp.StatusCode)
}
s := sha256.New()
if _, err := io.Copy(s, resp.Body); err != nil {
return "", fmt.Errorf("unable to download %s\n%w", uri, err)
}
return hex.EncodeToString(s.Sum(nil)), nil
}
func WithBasicAuth(username, password string) RequestModifierFunc {
return func(req *http.Request) *http.Request {
req.SetBasicAuth(username, password)
return req
}
}