mirror of
https://codeberg.org/forgejo/forgejo.git
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237 lines
5.1 KiB
Go
237 lines
5.1 KiB
Go
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// Copyright 2023 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package alpine
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import (
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"archive/tar"
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"bufio"
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"compress/gzip"
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"crypto/sha1"
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"encoding/base64"
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"io"
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"strconv"
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"strings"
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"code.gitea.io/gitea/modules/util"
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"code.gitea.io/gitea/modules/validation"
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)
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var (
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ErrMissingPKGINFOFile = util.NewInvalidArgumentErrorf("PKGINFO file is missing")
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ErrInvalidName = util.NewInvalidArgumentErrorf("package name is invalid")
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ErrInvalidVersion = util.NewInvalidArgumentErrorf("package version is invalid")
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)
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const (
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PropertyMetadata = "alpine.metadata"
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PropertyBranch = "alpine.branch"
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PropertyRepository = "alpine.repository"
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PropertyArchitecture = "alpine.architecture"
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SettingKeyPrivate = "alpine.key.private"
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SettingKeyPublic = "alpine.key.public"
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RepositoryPackage = "_alpine"
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RepositoryVersion = "_repository"
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)
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// https://wiki.alpinelinux.org/wiki/Apk_spec
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// Package represents an Alpine package
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type Package struct {
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Name string
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Version string
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VersionMetadata VersionMetadata
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FileMetadata FileMetadata
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}
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// Metadata of an Alpine package
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type VersionMetadata struct {
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Description string `json:"description,omitempty"`
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License string `json:"license,omitempty"`
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ProjectURL string `json:"project_url,omitempty"`
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Maintainer string `json:"maintainer,omitempty"`
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}
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type FileMetadata struct {
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Checksum string `json:"checksum"`
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Packager string `json:"packager,omitempty"`
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BuildDate int64 `json:"build_date,omitempty"`
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Size int64 `json:"size,omitempty"`
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Architecture string `json:"architecture,omitempty"`
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Origin string `json:"origin,omitempty"`
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CommitHash string `json:"commit_hash,omitempty"`
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InstallIf string `json:"install_if,omitempty"`
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Provides []string `json:"provides,omitempty"`
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Dependencies []string `json:"dependencies,omitempty"`
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}
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// ParsePackage parses the Alpine package file
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func ParsePackage(r io.Reader) (*Package, error) {
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// Alpine packages are concated .tar.gz streams. Usually the first stream contains the package metadata.
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br := bufio.NewReader(r) // needed for gzip Multistream
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h := sha1.New()
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gzr, err := gzip.NewReader(&teeByteReader{br, h})
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if err != nil {
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return nil, err
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}
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defer gzr.Close()
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for {
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gzr.Multistream(false)
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tr := tar.NewReader(gzr)
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for {
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hd, err := tr.Next()
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil, err
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}
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if hd.Name == ".PKGINFO" {
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p, err := ParsePackageInfo(tr)
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if err != nil {
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return nil, err
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}
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// drain the reader
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for {
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if _, err := tr.Next(); err != nil {
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break
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}
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}
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p.FileMetadata.Checksum = "Q1" + base64.StdEncoding.EncodeToString(h.Sum(nil))
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return p, nil
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}
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}
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h = sha1.New()
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err = gzr.Reset(&teeByteReader{br, h})
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil, err
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}
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}
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return nil, ErrMissingPKGINFOFile
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}
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// ParsePackageInfo parses a PKGINFO file to retrieve the metadata of an Alpine package
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func ParsePackageInfo(r io.Reader) (*Package, error) {
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p := &Package{}
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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line := scanner.Text()
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if strings.HasPrefix(line, "#") {
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continue
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}
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i := strings.IndexRune(line, '=')
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if i == -1 {
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continue
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}
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key := strings.TrimSpace(line[:i])
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value := strings.TrimSpace(line[i+1:])
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switch key {
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case "pkgname":
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p.Name = value
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case "pkgver":
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p.Version = value
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case "pkgdesc":
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p.VersionMetadata.Description = value
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case "url":
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p.VersionMetadata.ProjectURL = value
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case "builddate":
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n, err := strconv.ParseInt(value, 10, 64)
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if err == nil {
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p.FileMetadata.BuildDate = n
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}
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case "size":
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n, err := strconv.ParseInt(value, 10, 64)
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if err == nil {
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p.FileMetadata.Size = n
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}
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case "arch":
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p.FileMetadata.Architecture = value
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case "origin":
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p.FileMetadata.Origin = value
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case "commit":
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p.FileMetadata.CommitHash = value
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case "maintainer":
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p.VersionMetadata.Maintainer = value
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case "packager":
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p.FileMetadata.Packager = value
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case "license":
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p.VersionMetadata.License = value
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case "install_if":
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p.FileMetadata.InstallIf = value
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case "provides":
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if value != "" {
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p.FileMetadata.Provides = append(p.FileMetadata.Provides, value)
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}
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case "depend":
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if value != "" {
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p.FileMetadata.Dependencies = append(p.FileMetadata.Dependencies, value)
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}
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}
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}
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if err := scanner.Err(); err != nil {
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return nil, err
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}
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if p.Name == "" {
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return nil, ErrInvalidName
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}
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if p.Version == "" {
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return nil, ErrInvalidVersion
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}
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if !validation.IsValidURL(p.VersionMetadata.ProjectURL) {
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p.VersionMetadata.ProjectURL = ""
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}
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return p, nil
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}
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// Same as io.TeeReader but implements io.ByteReader
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type teeByteReader struct {
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r *bufio.Reader
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w io.Writer
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}
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func (t *teeByteReader) Read(p []byte) (int, error) {
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n, err := t.r.Read(p)
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if n > 0 {
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if n, err := t.w.Write(p[:n]); err != nil {
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return n, err
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}
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}
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return n, err
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}
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func (t *teeByteReader) ReadByte() (byte, error) {
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b, err := t.r.ReadByte()
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if err == nil {
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if _, err := t.w.Write([]byte{b}); err != nil {
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return 0, err
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}
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}
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return b, err
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}
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