fix(fetcher/redhat): fetch oval v1

fetcher/redhat/redhat.go

@@ -1,7 +1,11 @@
 package redhat
 
 import (
+	"archive/tar"
+	"compress/gzip"
 	"fmt"
+	"io"
+	"net/http"
 	"strconv"
 
 	"github.com/inconshreveable/log15"
@@ -25,24 +29,56 @@ func FetchFiles(versions []string) (map[string][]util.FetchResult, error) {
 			continue
 		}
 
-		reqs := []util.FetchRequest{{
-			Target:   v,
-			URL:      fmt.Sprintf("https://www.redhat.com/security/data/oval/com.redhat.rhsa-RHEL%s.xml.bz2", v),
-			MIMEType: util.MIMETypeBzip2,
-		}}
+		resp, err := http.Get("https://access.redhat.com/security/data/archive/oval_v1_20230706.tar.gz")
+		if err != nil {
+			return nil, xerrors.Errorf("Failed to get oval v1. err: %w", err)
+		}
+		if resp.StatusCode != http.StatusOK {
+			return nil, xerrors.Errorf("Failed to get oval v1. err: bad status %d", resp.StatusCode)
+		}
+		defer resp.Body.Close()
+
+		gr, err := gzip.NewReader(resp.Body)
+		if err != nil {
+			return nil, xerrors.Errorf("Failed to create gzip reader. err: %w", err)
+		}
+		defer gr.Close()
+
+		tr := tar.NewReader(gr)
+		for {
+			hdr, err := tr.Next()
+			if err == io.EOF {
+				break
+			}
+			if err != nil {
+				return nil, xerrors.Errorf("Failed to next tar reader. err: %w", err)
+			}
+
+			if hdr.Name == fmt.Sprintf("com.redhat.rhsa-RHEL%s.xml", v) {
+				bs, err := io.ReadAll(tr)
+				if err != nil {
+					return nil, xerrors.Errorf("Failed to read all com.redhat.rhsa-RHEL%s.xml. err: %w", v, err)
+				}
+				results[v] = append(results[v], util.FetchResult{
+					Target: v,
+					URL:    fmt.Sprintf("https://www.redhat.com/security/data/oval/com.redhat.rhsa-RHEL%s.xml.bz2", v),
+					Body:   bs,
+				})
+			}
+
+		}
+
 		if n != 5 {
-			reqs = append(reqs, util.FetchRequest{
+			rs, err := util.FetchFeedFiles([]util.FetchRequest{{
 				Target:   v,
 				URL:      fmt.Sprintf("https://access.redhat.com/security/data/oval/v2/RHEL%s/rhel-%s.oval.xml.bz2", v, v),
 				MIMEType: util.MIMETypeBzip2,
-			})
-		}
-
-		rs, err := util.FetchFeedFiles(reqs)
-		if err != nil {
-			return nil, xerrors.Errorf("Failed to fetch. err: %w", err)
+			}})
+			if err != nil {
+				return nil, xerrors.Errorf("Failed to fetch. err: %w", err)
+			}
+			results[v] = append(results[v], rs...)
 		}
-		results[v] = append(results[v], rs...)
 	}
 	if len(results) == 0 {
 		return nil, xerrors.New("There are no versions to fetch")