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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package alpine
import (
"archive/tar"
"bufio"
"compress/gzip"
"crypto/sha1"
"encoding/base64"
"io"
"strconv"
"strings"
"code.gitea.io/gitea/modules/util"
"code.gitea.io/gitea/modules/validation"
)
var (
ErrMissingPKGINFOFile = util.NewInvalidArgumentErrorf("PKGINFO file is missing")
ErrInvalidName = util.NewInvalidArgumentErrorf("package name is invalid")
ErrInvalidVersion = util.NewInvalidArgumentErrorf("package version is invalid")
)
const (
PropertyMetadata = "alpine.metadata"
PropertyBranch = "alpine.branch"
PropertyRepository = "alpine.repository"
PropertyArchitecture = "alpine.architecture"
SettingKeyPrivate = "alpine.key.private"
SettingKeyPublic = "alpine.key.public"
RepositoryPackage = "_alpine"
RepositoryVersion = "_repository"
)
// https://wiki.alpinelinux.org/wiki/Apk_spec
// Package represents an Alpine package
type Package struct {
Name string
Version string
VersionMetadata VersionMetadata
FileMetadata FileMetadata
}
// Metadata of an Alpine package
type VersionMetadata struct {
Description string `json:"description,omitempty"`
License string `json:"license,omitempty"`
ProjectURL string `json:"project_url,omitempty"`
Maintainer string `json:"maintainer,omitempty"`
}
type FileMetadata struct {
Checksum string `json:"checksum"`
Packager string `json:"packager,omitempty"`
BuildDate int64 `json:"build_date,omitempty"`
Size int64 `json:"size,omitempty"`
Architecture string `json:"architecture,omitempty"`
Origin string `json:"origin,omitempty"`
CommitHash string `json:"commit_hash,omitempty"`
InstallIf string `json:"install_if,omitempty"`
Provides []string `json:"provides,omitempty"`
Dependencies []string `json:"dependencies,omitempty"`
ProviderPriority int64 `json:"provider_priority,omitempty"`
}
// ParsePackage parses the Alpine package file
func ParsePackage(r io.Reader) (*Package, error) {
// Alpine packages are concated .tar.gz streams. Usually the first stream contains the package metadata.
br := bufio.NewReader(r) // needed for gzip Multistream
h := sha1.New()
gzr, err := gzip.NewReader(&teeByteReader{br, h})
if err != nil {
return nil, err
}
defer gzr.Close()
for {
gzr.Multistream(false)
tr := tar.NewReader(gzr)
for {
hd, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if hd.Name == ".PKGINFO" {
p, err := ParsePackageInfo(tr)
if err != nil {
return nil, err
}
// drain the reader
for {
if _, err := tr.Next(); err != nil {
break
}
}
p.FileMetadata.Checksum = "Q1" + base64.StdEncoding.EncodeToString(h.Sum(nil))
return p, nil
}
}
h = sha1.New()
err = gzr.Reset(&teeByteReader{br, h})
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
}
return nil, ErrMissingPKGINFOFile
}
// ParsePackageInfo parses a PKGINFO file to retrieve the metadata of an Alpine package
func ParsePackageInfo(r io.Reader) (*Package, error) {
p := &Package{}
scanner := bufio.NewScanner(r)
for scanner.Scan() {
line := scanner.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 "pkgver":
p.Version = value
case "pkgdesc":
p.VersionMetadata.Description = value
case "url":
p.VersionMetadata.ProjectURL = value
case "builddate":
n, err := strconv.ParseInt(value, 10, 64)
if err == nil {
p.FileMetadata.BuildDate = n
}
case "size":
n, err := strconv.ParseInt(value, 10, 64)
if err == nil {
p.FileMetadata.Size = n
}
case "arch":
p.FileMetadata.Architecture = value
case "origin":
p.FileMetadata.Origin = value
case "commit":
p.FileMetadata.CommitHash = value
case "maintainer":
p.VersionMetadata.Maintainer = value
case "packager":
p.FileMetadata.Packager = value
case "license":
p.VersionMetadata.License = value
case "install_if":
p.FileMetadata.InstallIf = value
case "provides":
if value != "" {
p.FileMetadata.Provides = append(p.FileMetadata.Provides, value)
}
case "depend":
if value != "" {
p.FileMetadata.Dependencies = append(p.FileMetadata.Dependencies, value)
}
case "provider_priority":
n, err := strconv.ParseInt(value, 10, 64)
if err == nil {
p.FileMetadata.ProviderPriority = n
}
}
}
if err := scanner.Err(); err != nil {
return nil, err
}
if p.Name == "" {
return nil, ErrInvalidName
}
if p.Version == "" {
return nil, ErrInvalidVersion
}
if !validation.IsValidURL(p.VersionMetadata.ProjectURL) {
p.VersionMetadata.ProjectURL = ""
}
return p, nil
}
// Same as io.TeeReader but implements io.ByteReader
type teeByteReader struct {
r *bufio.Reader
w io.Writer
}
func (t *teeByteReader) Read(p []byte) (int, error) {
n, err := t.r.Read(p)
if n > 0 {
if n, err := t.w.Write(p[:n]); err != nil {
return n, err
}
}
return n, err
}
func (t *teeByteReader) ReadByte() (byte, error) {
b, err := t.r.ReadByte()
if err == nil {
if _, err := t.w.Write([]byte{b}); err != nil {
return 0, err
}
}
return b, err
}
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