File size: 771 Bytes
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package main
import (
"fmt"
"io"
"net/http"
"os"
)
// fetchFile will download and open a file with the contents of `url`.
func fetchFile(url string) (*os.File, int64, error) {
resp, err := http.Get(url)
if err != nil {
return nil, 0, fmt.Errorf("fetch: %w", err)
}
defer resp.Body.Close()
if resp.StatusCode != 200 {
return nil, 0, fmt.Errorf("non-200 response: %s", resp.Status)
}
fd, err := os.CreateTemp("", "*.zip")
if err != nil {
return nil, 0, fmt.Errorf("create temp file: %w", err)
}
n, err := io.Copy(fd, resp.Body)
if err != nil {
fd.Close()
return nil, 0, fmt.Errorf("download file '%s': %w", url, err)
}
_, err = fd.Seek(0, 0)
if err != nil {
fd.Close()
return nil, 0, fmt.Errorf("seek: %w", err)
}
return fd, n, nil
}
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