working commit

blobexist.go

@@ -0,0 +1,59 @@
+package client
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strconv"
+)
+
+func (cli *Client) BlobExists(ctx context.Context, rawref string) (bool, int64, error) {
+	var err error
+	var exist bool
+	var size int64
+
+	ref, err := NewReference(rawref)
+	if err != nil {
+		return exist, size, err
+	}
+	uri := ref.Blob()
+	user, pass := ref.Userinfo()
+
+	fmt.Println(uri)
+	req, err := http.NewRequestWithContext(ctx, http.MethodHead, uri, nil)
+	if err != nil {
+		return exist, size, err
+	}
+	req.Header.Set("User-Agent", cli.userAgent)
+	req.Header.Set("Accept", "*/*")
+
+	if cli.authenticator != nil {
+		authHeader, authKey, err := cli.authenticator.MakeHeader(user, pass)
+		if err != nil {
+			return exist, size, err
+		}
+		req.Header.Set(authHeader, authKey)
+	}
+
+	resp, err := cli.httpClient.Do(req)
+	if err != nil {
+		return exist, size, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusNotFound {
+		return exist, size, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		err := fmt.Errorf("Unxected response code %s", resp.Status)
+		return exist, size, err
+	}
+	contentLength := resp.Header.Get("Content-Length")
+	size, err = strconv.ParseInt(contentLength, 10, 64)
+	if err != nil {
+		return exist, size, err
+	}
+
+	exist = true
+	return exist, size, err
+}