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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package arch
import (
"archive/tar"
"bufio"
"bytes"
"compress/gzip"
"io"
"regexp"
"strconv"
"strings"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/modules/validation"
"github.com/klauspost/compress/zstd"
"github.com/ulikunitz/xz"
)
const (
PropertyRepository = "arch.repository"
PropertyArchitecture = "arch.architecture"
PropertySignature = "arch.signature"
PropertyMetadata = "arch.metadata"
SettingKeyPrivate = "arch.key.private"
SettingKeyPublic = "arch.key.public"
RepositoryPackage = "_arch"
RepositoryVersion = "_repository"
AnyArch = "any"
)
var (
ErrMissingPKGINFOFile = util.NewInvalidArgumentErrorf(".PKGINFO file is missing")
ErrUnsupportedFormat = util.NewInvalidArgumentErrorf("unsupported package container format")
ErrInvalidName = util.NewInvalidArgumentErrorf("package name is invalid")
ErrInvalidVersion = util.NewInvalidArgumentErrorf("package version is invalid")
ErrInvalidArchitecture = util.NewInvalidArgumentErrorf("package architecture is invalid")
// https://man.archlinux.org/man/PKGBUILD.5
namePattern = regexp.MustCompile(`\A[a-zA-Z0-9@._+-]+\z`)
versionPattern = regexp.MustCompile(`\A(?:[0-9]:)?[a-zA-Z0-9.+~]+(?:-[a-zA-Z0-9.+-~]+)?\z`)
)
type Package struct {
Name string
Version string
VersionMetadata VersionMetadata
FileMetadata FileMetadata
FileCompressionExtension string
}
type VersionMetadata struct {
Description string `json:"description,omitempty"`
ProjectURL string `json:"project_url,omitempty"`
Licenses []string `json:"licenses,omitempty"`
}
type FileMetadata struct {
Architecture string `json:"architecture"`
Base string `json:"base,omitempty"`
InstalledSize int64 `json:"installed_size,omitempty"`
BuildDate int64 `json:"build_date,omitempty"`
Packager string `json:"packager,omitempty"`
Groups []string `json:"groups,omitempty"`
Provides []string `json:"provides,omitempty"`
Depends []string `json:"depends,omitempty"`
OptDepends []string `json:"opt_depends,omitempty"`
MakeDepends []string `json:"make_depends,omitempty"`
CheckDepends []string `json:"check_depends,omitempty"`
XData []string `json:"xdata,omitempty"`
Backup []string `json:"backup,omitempty"`
Files []string `json:"files,omitempty"`
}
// ParsePackage parses an Arch package file
func ParsePackage(r io.Reader) (*Package, error) {
header := make([]byte, 10)
n, err := util.ReadAtMost(r, header)
if err != nil {
return nil, err
}
r = io.MultiReader(bytes.NewReader(header[:n]), r)
var inner io.Reader
var compressionType string
if bytes.HasPrefix(header, []byte{0x28, 0xB5, 0x2F, 0xFD}) { // zst
zr, err := zstd.NewReader(r)
if err != nil {
return nil, err
}
defer zr.Close()
inner = zr
compressionType = "zst"
} else if bytes.HasPrefix(header, []byte{0xFD, 0x37, 0x7A, 0x58, 0x5A}) { // xz
xzr, err := xz.NewReader(r)
if err != nil {
return nil, err
}
inner = xzr
compressionType = "xz"
} else if bytes.HasPrefix(header, []byte{0x1F, 0x8B}) { // gz
gzr, err := gzip.NewReader(r)
if err != nil {
return nil, err
}
defer gzr.Close()
inner = gzr
compressionType = "gz"
} else {
return nil, ErrUnsupportedFormat
}
var p *Package
files := make([]string, 0, 10)
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
}
filename := hd.FileInfo().Name()
if filename == ".PKGINFO" {
p, err = ParsePackageInfo(tr)
if err != nil {
return nil, err
}
} else if !strings.HasPrefix(filename, ".") {
files = append(files, hd.Name)
}
}
if p == nil {
return nil, ErrMissingPKGINFOFile
}
p.FileMetadata.Files = files
p.FileCompressionExtension = compressionType
return p, nil
}
// ParsePackageInfo parses a .PKGINFO file to retrieve the metadata
// https://man.archlinux.org/man/PKGBUILD.5
// https://gitlab.archlinux.org/pacman/pacman/-/blob/master/lib/libalpm/be_package.c#L161
func ParsePackageInfo(r io.Reader) (*Package, error) {
p := &Package{}
s := bufio.NewScanner(r)
for s.Scan() {
line := s.Text()
if strings.HasPrefix(line, "#") {
continue
}
i := strings.IndexRune(line, '=')
if i == -1 {
continue
}
key := strings.TrimSpace(line[:i])
value := strings.TrimSpace(line[i+1:])
switch key {
case "pkgname":
p.Name = value
case "pkgbase":
p.FileMetadata.Base = value
case "pkgver":
p.Version = value
case "pkgdesc":
p.VersionMetadata.Description = value
case "url":
p.VersionMetadata.ProjectURL = value
case "packager":
p.FileMetadata.Packager = value
case "arch":
p.FileMetadata.Architecture = value
case "license":
p.VersionMetadata.Licenses = append(p.VersionMetadata.Licenses, value)
case "provides":
p.FileMetadata.Provides = append(p.FileMetadata.Provides, value)
case "depend":
p.FileMetadata.Depends = append(p.FileMetadata.Depends, value)
case "optdepend":
p.FileMetadata.OptDepends = append(p.FileMetadata.OptDepends, value)
case "makedepend":
p.FileMetadata.MakeDepends = append(p.FileMetadata.MakeDepends, value)
case "checkdepend":
p.FileMetadata.CheckDepends = append(p.FileMetadata.CheckDepends, value)
case "backup":
p.FileMetadata.Backup = append(p.FileMetadata.Backup, value)
case "group":
p.FileMetadata.Groups = append(p.FileMetadata.Groups, value)
case "builddate":
date, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return nil, err
}
p.FileMetadata.BuildDate = date
case "size":
size, err := strconv.ParseInt(value, 10, 64)
if err != nil {
return nil, err
}
p.FileMetadata.InstalledSize = size
case "xdata":
p.FileMetadata.XData = append(p.FileMetadata.XData, value)
}
}
if err := s.Err(); err != nil {
return nil, err
}
if !namePattern.MatchString(p.Name) {
return nil, ErrInvalidName
}
if !versionPattern.MatchString(p.Version) {
return nil, ErrInvalidVersion
}
if p.FileMetadata.Architecture == "" {
return nil, ErrInvalidArchitecture
}
if !validation.IsValidURL(p.VersionMetadata.ProjectURL) {
p.VersionMetadata.ProjectURL = ""
}
return p, nil
}
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