88 lines
1.9 KiB
Go
88 lines
1.9 KiB
Go
package plugins
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import (
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"context"
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"errors"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"code.icb4dc0.de/buildr/buildr/internal/ioutils"
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)
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type Downloader interface {
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Download(ctx context.Context, target string, src *url.URL) error
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}
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var (
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ErrUnsupportedProtocol = errors.New("unsupported protocol")
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_ Downloader = (*GenericDownloader)(nil)
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_ Downloader = (*HTTPDownloader)(nil)
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_ Downloader = (*FileDownloader)(nil)
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)
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type GenericDownloader map[string]Downloader
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func (g GenericDownloader) Download(ctx context.Context, target string, src *url.URL) error {
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if protocolDownloader, ok := g[src.Scheme]; !ok {
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return fmt.Errorf("%w: %s", ErrUnsupportedProtocol, src.Scheme)
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} else {
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return protocolDownloader.Download(ctx, target, src)
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}
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}
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type HTTPDownloader struct {
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Client *http.Client
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}
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func (h HTTPDownloader) Download(ctx context.Context, target string, src *url.URL) (err error) {
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var req *http.Request
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req, err = http.NewRequest(http.MethodGet, src.String(), nil)
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if err != nil {
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return err
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}
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client := h.Client
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if client == nil {
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client = http.DefaultClient
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}
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resp, err := client.Do(req.WithContext(ctx))
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if err != nil {
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return err
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}
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defer func() {
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err = errors.Join(err, resp.Body.Close())
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}()
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var out io.WriteCloser
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if out, err = os.Create(target); err != nil {
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return err
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}
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defer func() {
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err = errors.Join(err, out.Close())
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}()
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_, err = ioutils.CopyWithPooledBuffer(out, resp.Body)
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return err
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}
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type FileDownloader struct{}
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func (f FileDownloader) Download(_ context.Context, target string, src *url.URL) error {
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if src.Scheme != "file" {
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return fmt.Errorf("%w: %s", ErrUnsupportedProtocol, src.Scheme)
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}
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if _, err := os.Stat(target); err == nil {
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if err = os.Remove(target); err != nil {
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return err
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}
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}
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return os.Link(src.Path, target)
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}
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