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package slackware_com
import (
"bytes"
"context"
"fmt"
"hash"
"io"
"net"
"net/http"
"net/url"
"path"
"strings"
)
type Mirror struct {
client *http.Client
url *url.URL
ChangeLog *ChangeLog
Checksums *Checksums
}
func OpenMirror(mirrorURL *url.URL) (*Mirror, error) {
var zeroDialer net.Dialer
transport := http.DefaultTransport.(*http.Transport).Clone()
transport.DialContext = func(ctx context.Context, network, addr string) (net.Conn, error) {
return zeroDialer.DialContext(ctx, "tcp4", addr)
}
http.DefaultClient.Transport = transport
mirror := Mirror{
client: http.DefaultClient,
url: mirrorURL,
}
err := mirror.Sync()
if err != nil {
return nil, err
}
return &mirror, nil
}
func signaturePath(filePath string) string {
return fmt.Sprintf("%s.asc", filePath)
}
func isSignature(filePath string) bool {
return strings.HasSuffix(filePath, ".asc")
}
func (m *Mirror) hasSignature(filePath string) bool {
if isSignature(filePath) {
return false
}
if path.Base(filePath) == ChecksumsMD5 {
return true
}
return m.Checksums.HasFilePath(signaturePath(filePath))
}
func (m *Mirror) DownloadAndVerify(wr io.Writer, filePath string) error {
fileUrl := m.url.JoinPath(filePath).String()
resp, err := m.client.Get(fileUrl)
if err != nil {
return err
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("bad HTTP response: %s", http.StatusText(resp.StatusCode))
}
var r io.Reader = resp.Body
defer resp.Body.Close()
var hash *hash.Hash
if filePath != ChecksumsMD5 && filePath != signaturePath(ChecksumsMD5) {
h := m.Checksums.Hash()
r = io.TeeReader(r, h)
hash = &h
}
var signatureVerifier *GnuPGVerifier
if m.hasSignature(filePath) {
var signature bytes.Buffer
err := m.DownloadAndVerify(&signature, signaturePath(filePath))
if err != nil {
return err
}
signatureVerifier = RunSignatureVerifier(signature.String())
r = io.TeeReader(r, signatureVerifier)
}
_, err = io.Copy(wr, r)
if err != nil {
return err
}
if hash != nil {
ok, err := m.Checksums.Verify(filePath, (*hash).Sum(nil))
if err != nil {
return err
}
if !ok {
return fmt.Errorf("MD5 verification failed")
}
}
if signatureVerifier != nil {
ok, _ := signatureVerifier.IsValid()
if !ok {
return fmt.Errorf("signature verification failed")
}
}
return nil
}
func (m *Mirror) downloadChangeLog() error {
var buf bytes.Buffer
err := m.DownloadAndVerify(&buf, ChangeLogTxt)
if err != nil {
return fmt.Errorf("downloading %s: %w", ChangeLogTxt, err)
}
var changeLog ChangeLog
err = changeLog.UnmarshalText(buf.Bytes())
if err != nil {
return fmt.Errorf("%s: %w", ChangeLogTxt, err)
}
m.ChangeLog = &changeLog
return nil
}
func (m *Mirror) downloadChecksums() error {
var buf bytes.Buffer
err := m.DownloadAndVerify(&buf, ChecksumsMD5)
if err != nil {
return fmt.Errorf("downloading %s: %w", ChecksumsMD5, err)
}
var checksums Checksums
err = checksums.UnmarshalText(buf.Bytes())
if err != nil {
return fmt.Errorf("%s: %w", ChecksumsMD5, err)
}
m.Checksums = &checksums
return nil
}
// FindPackage returns the file path for the most appropriate package.
func (m *Mirror) FindPackage(pattern PackageNamePattern) (string, bool) {
found := ""
priority := 0
pathPriority := 0
for _, file := range m.Checksums.Files() {
if !IsPackage(file) {
continue
}
file = path.Clean(file)
if strings.HasPrefix(file, "patches/packages") {
pathPriority = 5
} else if strings.HasPrefix(file, "slackware") {
pathPriority = 4
} else if strings.HasPrefix(file, "extra") {
pathPriority = 3
} else if strings.HasPrefix(file, "testing/packages") {
pathPriority = 2
} else if strings.HasPrefix(file, "pasture") {
pathPriority = 1
} else {
continue
}
pkg, _ := NewPackageNameFromPath(file)
if pattern.IsMatch(pkg) && pathPriority > priority {
found = file
priority = pathPriority
}
}
return found, found != ""
}
func (m *Mirror) Sync() error {
err := m.downloadChecksums()
if err != nil {
return err
}
err = m.downloadChangeLog()
if err != nil {
return err
}
return nil
}
|
