/
listing_entry.go
97 lines (83 loc) · 2.47 KB
/
listing_entry.go
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package db
import (
"crypto/sha256"
"encoding/json"
"fmt"
"net/url"
"path"
"path/filepath"
"time"
"github.com/spf13/afero"
"github.com/nextlinux/govulners/internal/file"
)
// ListingEntry represents basic metadata about a database archive such as what is in the archive (built/version)
// as well as how to obtain and verify the archive (URL/checksum).
type ListingEntry struct {
Built time.Time // RFC 3339
Version int
URL *url.URL
Checksum string
}
// ListingEntryJSON is a helper struct for converting a ListingEntry into JSON (or parsing from JSON)
type ListingEntryJSON struct {
Built string `json:"built"`
Version int `json:"version"`
URL string `json:"url"`
Checksum string `json:"checksum"`
}
// NewListingEntryFromArchive creates a new ListingEntry based on the metadata from a database flat file.
func NewListingEntryFromArchive(fs afero.Fs, metadata Metadata, dbArchivePath string, baseURL *url.URL) (ListingEntry, error) {
checksum, err := file.HashFile(fs, dbArchivePath, sha256.New())
if err != nil {
return ListingEntry{}, fmt.Errorf("unable to find db archive checksum: %w", err)
}
dbArchiveName := filepath.Base(dbArchivePath)
fileURL, _ := url.Parse(baseURL.String())
fileURL.Path = path.Join(fileURL.Path, dbArchiveName)
return ListingEntry{
Built: metadata.Built,
Version: metadata.Version,
URL: fileURL,
Checksum: "sha256:" + checksum,
}, nil
}
// ToListingEntry converts a ListingEntryJSON to a ListingEntry.
func (l ListingEntryJSON) ToListingEntry() (ListingEntry, error) {
build, err := time.Parse(time.RFC3339, l.Built)
if err != nil {
return ListingEntry{}, fmt.Errorf("cannot convert built time (%s): %+v", l.Built, err)
}
u, err := url.Parse(l.URL)
if err != nil {
return ListingEntry{}, fmt.Errorf("cannot parse url (%s): %+v", l.URL, err)
}
return ListingEntry{
Built: build.UTC(),
Version: l.Version,
URL: u,
Checksum: l.Checksum,
}, nil
}
func (l *ListingEntry) UnmarshalJSON(data []byte) error {
var lej ListingEntryJSON
if err := json.Unmarshal(data, &lej); err != nil {
return err
}
le, err := lej.ToListingEntry()
if err != nil {
return err
}
*l = le
return nil
}
func (l *ListingEntry) MarshalJSON() ([]byte, error) {
return json.Marshal(&ListingEntryJSON{
Built: l.Built.Format(time.RFC3339),
Version: l.Version,
Checksum: l.Checksum,
URL: l.URL.String(),
})
}
func (l ListingEntry) String() string {
return fmt.Sprintf("Listing(url=%s)", l.URL)
}