91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
package repocli
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import (
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"bytes"
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"context"
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"errors"
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"fmt"
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"net/http"
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"strconv"
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"strings"
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)
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func (cli *Client) GetManifest(ctx context.Context, rawrepo, tag string) (bool, string, []byte, error) {
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var err error
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var exist bool
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var mime string
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var man []byte
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ref, err := NewRepository(rawrepo)
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if err != nil {
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return exist, mime, man, err
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}
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uri := ref.Manifest(tag)
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, uri, nil)
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if err != nil {
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return exist, mime, man, err
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}
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req.Header.Set("User-Agent", cli.userAgent)
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req.Header.Set("Accept", "*/*")
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resp, err := cli.httpClient.Do(req)
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if err != nil {
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return exist, mime, man, err
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}
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defer resp.Body.Close()
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if resp.StatusCode == http.StatusNotFound {
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return exist, mime, man, err
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}
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if resp.StatusCode != http.StatusOK {
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err := fmt.Errorf("Unxected response code %s", resp.Status)
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return exist, mime, man, err
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}
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contentLength := resp.Header.Get("Content-Length")
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if contentLength == "" {
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err = errors.New("Empty Content-Length header")
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return exist, mime, man, err
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}
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manSize, err := strconv.ParseInt(contentLength, 10, 64)
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if err != nil {
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return exist, mime, man, err
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}
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mime = resp.Header.Get("Content-Type")
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if mime == "" {
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err := fmt.Errorf("Empty MIME type declaration")
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return exist, mime, man, err
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}
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buffer := bytes.NewBuffer(nil)
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recSize, err := Copy(ctx, buffer, resp.Body)
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if manSize != recSize {
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err := fmt.Errorf("Mismatch declared and actual body size, %d and %d", manSize, recSize)
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return exist, mime, man, err
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}
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man = buffer.Bytes()
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csum := resp.Header.Get("Docker-Content-Digest")
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if csum == "" {
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err := fmt.Errorf("Empty digest declaration")
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return exist, mime, man, err
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}
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csum = strings.ToLower(csum)
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switch DigestType(csum) {
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case SHA256:
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if csum != SHA256Digest(man) {
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err := fmt.Errorf("Mismatch digest and actual declaration")
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return exist, mime, man, err
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}
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case SHA512:
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if csum != SHA256Digest(man) {
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err := fmt.Errorf("Mismatch digest and actual declaration")
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return exist, mime, man, err
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}
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default:
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err := fmt.Errorf("Unknown digest type: %s", csum)
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return exist, mime, man, err
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}
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exist = true
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return exist, mime, man, err
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}
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