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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package debian
import (
"archive/tar"
"bufio"
"compress/gzip"
"io"
"net/mail"
"regexp"
"strings"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/modules/validation"
"github.com/blakesmith/ar"
"github.com/klauspost/compress/zstd"
"github.com/ulikunitz/xz"
)
const (
PropertyDistribution = "debian.distribution"
PropertyComponent = "debian.component"
PropertyArchitecture = "debian.architecture"
PropertyControl = "debian.control"
PropertyRepositoryIncludeInRelease = "debian.repository.include_in_release"
SettingKeyPrivate = "debian.key.private"
SettingKeyPublic = "debian.key.public"
RepositoryPackage = "_debian"
RepositoryVersion = "_repository"
controlTar = "control.tar"
)
var (
ErrMissingControlFile = util.NewInvalidArgumentErrorf("control file is missing")
ErrUnsupportedCompression = util.NewInvalidArgumentErrorf("unsupported compression algorithm")
ErrInvalidName = util.NewInvalidArgumentErrorf("package name is invalid")
ErrInvalidVersion = util.NewInvalidArgumentErrorf("package version is invalid")
ErrInvalidArchitecture = util.NewInvalidArgumentErrorf("package architecture is invalid")
// https://www.debian.org/doc/debian-policy/ch-controlfields.html#source
namePattern = regexp.MustCompile(`\A[a-z0-9][a-z0-9+-.]+\z`)
// https://www.debian.org/doc/debian-policy/ch-controlfields.html#version
versionPattern = regexp.MustCompile(`\A(?:[0-9]:)?[a-zA-Z0-9.+~]+(?:-[a-zA-Z0-9.+-~]+)?\z`)
)
type Package struct {
Name string
Version string
Architecture string
Control string
Metadata *Metadata
}
type Metadata struct {
Maintainer string `json:"maintainer,omitempty"`
ProjectURL string `json:"project_url,omitempty"`
Description string `json:"description,omitempty"`
Dependencies []string `json:"dependencies,omitempty"`
}
// ParsePackage parses the Debian package file
// https://manpages.debian.org/bullseye/dpkg-dev/deb.5.en.html
func ParsePackage(r io.Reader) (*Package, error) {
arr := ar.NewReader(r)
for {
hd, err := arr.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if strings.HasPrefix(hd.Name, controlTar) {
var inner io.Reader
switch hd.Name[len(controlTar):] {
case "":
inner = arr
case ".gz":
gzr, err := gzip.NewReader(arr)
if err != nil {
return nil, err
}
defer gzr.Close()
inner = gzr
case ".xz":
xzr, err := xz.NewReader(arr)
if err != nil {
return nil, err
}
inner = xzr
case ".zst":
zr, err := zstd.NewReader(arr)
if err != nil {
return nil, err
}
defer zr.Close()
inner = zr
default:
return nil, ErrUnsupportedCompression
}
tr := tar.NewReader(inner)
for {
hd, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if hd.Typeflag != tar.TypeReg {
continue
}
if hd.FileInfo().Name() == "control" {
return ParseControlFile(tr)
}
}
}
}
return nil, ErrMissingControlFile
}
// ParseControlFile parses a Debian control file to retrieve the metadata
func ParseControlFile(r io.Reader) (*Package, error) {
p := &Package{
Metadata: &Metadata{},
}
key := ""
var depends strings.Builder
var control strings.Builder
s := bufio.NewScanner(io.TeeReader(r, &control))
for s.Scan() {
line := s.Text()
trimmed := strings.TrimSpace(line)
if trimmed == "" {
continue
}
if line[0] == ' ' || line[0] == '\t' {
switch key {
case "Description":
p.Metadata.Description += line
case "Depends":
depends.WriteString(trimmed)
}
} else {
parts := strings.SplitN(trimmed, ":", 2)
if len(parts) < 2 {
continue
}
key = parts[0]
value := strings.TrimSpace(parts[1])
switch key {
case "Package":
if !namePattern.MatchString(value) {
return nil, ErrInvalidName
}
p.Name = value
case "Version":
if !versionPattern.MatchString(value) {
return nil, ErrInvalidVersion
}
p.Version = value
case "Architecture":
if value == "" {
return nil, ErrInvalidArchitecture
}
p.Architecture = value
case "Maintainer":
a, err := mail.ParseAddress(value)
if err != nil || a.Name == "" {
p.Metadata.Maintainer = value
} else {
p.Metadata.Maintainer = a.Name
}
case "Description":
p.Metadata.Description = value
case "Depends":
depends.WriteString(value)
case "Homepage":
if validation.IsValidURL(value) {
p.Metadata.ProjectURL = value
}
}
}
}
if err := s.Err(); err != nil {
return nil, err
}
dependencies := strings.Split(depends.String(), ",")
for i := range dependencies {
dependencies[i] = strings.TrimSpace(dependencies[i])
}
p.Metadata.Dependencies = dependencies
p.Control = control.String()
return p, nil
}
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