[#932] adm: Move InitializeContext to util package

Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

cmd/frostfs-adm/internal/modules/morph/util/download.go

@@ -0,0 +1,81 @@
+package util
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"code.gitea.io/sdk/gitea"
+	"github.com/spf13/cobra"
+)
+
+func downloadContracts(cmd *cobra.Command, url string) (io.ReadCloser, error) {
+	cmd.Printf("Downloading contracts archive from '%s'\n", url)
+
+	// HTTP client with connect timeout
+	client := http.Client{
+		Transport: &http.Transport{
+			DialContext: (&net.Dialer{
+				Timeout: 10 * time.Second,
+			}).DialContext,
+		},
+	}
+
+	ctx, cancel := context.WithTimeout(cmd.Context(), 60*time.Second)
+	defer cancel()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return nil, fmt.Errorf("can't create request: %w", err)
+	}
+
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, fmt.Errorf("can't fetch contracts archive: %w", err)
+	}
+	return resp.Body, nil
+}
+
+func downloadContractsFromRepository(cmd *cobra.Command) (io.ReadCloser, error) {
+	client, err := gitea.NewClient("https://git.frostfs.info")
+	if err != nil {
+		return nil, fmt.Errorf("can't initialize repository client: %w", err)
+	}
+
+	releases, _, err := client.ListReleases("TrueCloudLab", "frostfs-contract", gitea.ListReleasesOptions{})
+	if err != nil {
+		return nil, fmt.Errorf("can't fetch release information: %w", err)
+	}
+
+	var latestRelease *gitea.Release
+	for _, r := range releases {
+		if !r.IsDraft && !r.IsPrerelease {
+			latestRelease = r
+			break
+		}
+	}
+
+	if latestRelease == nil {
+		return nil, fmt.Errorf("attempt to fetch contracts archive from the offitial repository failed: no releases found")
+	}
+
+	cmd.Printf("Found release %s (%s)\n", latestRelease.TagName, latestRelease.Title)
+
+	var url string
+	for _, a := range latestRelease.Attachments {
+		if strings.HasPrefix(a.Name, "frostfs-contract") {
+			url = a.DownloadURL
+			break
+		}
+	}
+	if url == "" {
+		return nil, errors.New("can't find contracts archive in the latest release")
+	}
+
+	return downloadContracts(cmd, url)
+}