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//
// Copyright 2021 The Sigstore 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
//
// 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 util
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"time"
)
// FileOrURLReadCloser reads content either from a URL or a byte slice
// Note: Caller is responsible for closing the returned ReadCloser
// Note: This must never be called from any server codepath to prevent SSRF
func FileOrURLReadCloser(ctx context.Context, url string, content []byte) (io.ReadCloser, error) {
var dataReader io.ReadCloser
if url != "" {
client := &http.Client{
Timeout: 30 * time.Second,
}
req, err := http.NewRequestWithContext(ctx, "GET", url, nil)
if err != nil {
return nil, err
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if resp.StatusCode < 200 || resp.StatusCode > 299 {
return nil, fmt.Errorf("error received while fetching artifact '%v': %v", url, resp.Status)
}
dataReader = resp.Body
} else {
dataReader = io.NopCloser(bytes.NewReader(content))
}
return dataReader, nil
}
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