mirror of
https://github.com/go-gitea/gitea.git
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* update github.com/alecthomas/chroma v0.8.0 -> v0.8.1 * github.com/blevesearch/bleve v1.0.10 -> v1.0.12 * editorconfig-core-go v2.1.1 -> v2.3.7 * github.com/gliderlabs/ssh v0.2.2 -> v0.3.1 * migrate editorconfig.ParseBytes to Parse * github.com/shurcooL/vfsgen to 0d455de96546 * github.com/go-git/go-git/v5 v5.1.0 -> v5.2.0 * github.com/google/uuid v1.1.1 -> v1.1.2 * github.com/huandu/xstrings v1.3.0 -> v1.3.2 * github.com/klauspost/compress v1.10.11 -> v1.11.1 * github.com/markbates/goth v1.61.2 -> v1.65.0 * github.com/mattn/go-sqlite3 v1.14.0 -> v1.14.4 * github.com/mholt/archiver v3.3.0 -> v3.3.2 * github.com/microcosm-cc/bluemonday 4f7140c49acb -> v1.0.4 * github.com/minio/minio-go v7.0.4 -> v7.0.5 * github.com/olivere/elastic v7.0.9 -> v7.0.20 * github.com/urfave/cli v1.20.0 -> v1.22.4 * github.com/prometheus/client_golang v1.1.0 -> v1.8.0 * github.com/xanzy/go-gitlab v0.37.0 -> v0.38.1 * mvdan.cc/xurls v2.1.0 -> v2.2.0 Co-authored-by: Lauris BH <lauris@nix.lv>
538 lines
16 KiB
Go
Vendored
538 lines
16 KiB
Go
Vendored
// Package archiver facilitates convenient, cross-platform, high-level archival
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// and compression operations for a variety of formats and compression algorithms.
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//
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// This package and its dependencies are written in pure Go (not cgo) and
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// have no external dependencies, so they should run on all major platforms.
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// (It also comes with a command for CLI use in the cmd/arc folder.)
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//
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// Each supported format or algorithm has a unique type definition that
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// implements the interfaces corresponding to the tasks they perform. For
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// example, the Tar type implements Reader, Writer, Archiver, Unarchiver,
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// Walker, and several other interfaces.
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//
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// The most common functions are implemented at the package level for
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// convenience: Archive, Unarchive, Walk, Extract, CompressFile, and
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// DecompressFile. With these, the format type is chosen implicitly,
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// and a sane default configuration is used.
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//
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// To customize a format's configuration, create an instance of its struct
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// with its fields set to the desired values. You can also use and customize
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// the handy Default* (replace the wildcard with the format's type name)
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// for a quick, one-off instance of the format's type.
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//
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// To obtain a new instance of a format's struct with the default config, use
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// the provided New*() functions. This is not required, however. An empty
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// struct of any type, for example &Zip{} is perfectly valid, so you may
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// create the structs manually, too. The examples on this page show how
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// either may be done.
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//
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// See the examples in this package for an idea of how to wield this package
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// for common tasks. Most of the examples which are specific to a certain
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// format type, for example Zip, can be applied to other types that implement
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// the same interfaces. For example, using Zip is very similar to using Tar
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// or TarGz (etc), and using Gz is very similar to using Sz or Xz (etc).
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//
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// When creating archives or compressing files using a specific instance of
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// the format's type, the name of the output file MUST match that of the
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// format, to prevent confusion later on. If you absolutely need a different
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// file extension, you may rename the file afterward.
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//
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// Values in this package are NOT safe for concurrent use. There is no
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// performance benefit of reusing them, and since they may contain important
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// state (especially while walking, reading, or writing), it is NOT
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// recommended to reuse values from this package or change their configuration
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// after they are in use.
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package archiver
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import (
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"fmt"
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"io"
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"os"
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"path"
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"path/filepath"
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"runtime"
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"strings"
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)
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// Archiver is a type that can create an archive file
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// from a list of source file names.
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type Archiver interface {
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ExtensionChecker
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// Archive adds all the files or folders in sources
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// to an archive to be created at destination. Files
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// are added to the root of the archive, and directories
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// are walked and recursively added, preserving folder
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// structure.
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Archive(sources []string, destination string) error
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}
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// ExtensionChecker validates file extensions
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type ExtensionChecker interface {
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CheckExt(name string) error
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}
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// FilenameChecker validates filenames to prevent path traversal attacks
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type FilenameChecker interface {
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CheckPath(to, filename string) error
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}
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// Unarchiver is a type that can extract archive files
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// into a folder.
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type Unarchiver interface {
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Unarchive(source, destination string) error
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}
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// Writer can write discrete byte streams of files to
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// an output stream.
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type Writer interface {
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Create(out io.Writer) error
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Write(f File) error
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Close() error
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}
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// Reader can read discrete byte streams of files from
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// an input stream.
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type Reader interface {
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Open(in io.Reader, size int64) error
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Read() (File, error)
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Close() error
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}
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// Extractor can extract a specific file from a source
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// archive to a specific destination folder on disk.
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type Extractor interface {
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Extract(source, target, destination string) error
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}
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// File provides methods for accessing information about
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// or contents of a file within an archive.
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type File struct {
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os.FileInfo
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// The original header info; depends on
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// type of archive -- could be nil, too.
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Header interface{}
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// Allow the file contents to be read (and closed)
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io.ReadCloser
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}
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// FileInfo is an os.FileInfo but optionally with
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// a custom name, useful if dealing with files that
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// are not actual files on disk, or which have a
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// different name in an archive than on disk.
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type FileInfo struct {
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os.FileInfo
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CustomName string
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}
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// Name returns fi.CustomName if not empty;
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// otherwise it returns fi.FileInfo.Name().
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func (fi FileInfo) Name() string {
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if fi.CustomName != "" {
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return fi.CustomName
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}
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return fi.FileInfo.Name()
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}
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// ReadFakeCloser is an io.Reader that has
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// a no-op close method to satisfy the
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// io.ReadCloser interface.
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type ReadFakeCloser struct {
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io.Reader
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}
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// Close implements io.Closer.
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func (rfc ReadFakeCloser) Close() error { return nil }
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// Walker can walk an archive file and return information
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// about each item in the archive.
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type Walker interface {
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Walk(archive string, walkFn WalkFunc) error
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}
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// WalkFunc is called at each item visited by Walk.
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// If an error is returned, the walk may continue
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// if the Walker is configured to continue on error.
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// The sole exception is the error value ErrStopWalk,
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// which stops the walk without an actual error.
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type WalkFunc func(f File) error
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// ErrStopWalk signals Walk to break without error.
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var ErrStopWalk = fmt.Errorf("walk stopped")
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// ErrFormatNotRecognized is an error that will be
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// returned if the file is not a valid archive format.
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var ErrFormatNotRecognized = fmt.Errorf("format not recognized")
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// Compressor compresses to out what it reads from in.
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// It also ensures a compatible or matching file extension.
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type Compressor interface {
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ExtensionChecker
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Compress(in io.Reader, out io.Writer) error
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}
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// Decompressor decompresses to out what it reads from in.
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type Decompressor interface {
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Decompress(in io.Reader, out io.Writer) error
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}
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// Matcher is a type that can return whether the given
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// file appears to match the implementation's format.
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// Implementations should return the file's read position
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// to where it was when the method was called.
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type Matcher interface {
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Match(io.ReadSeeker) (bool, error)
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}
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// Archive creates an archive of the source files to a new file at destination.
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// The archive format is chosen implicitly by file extension.
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func Archive(sources []string, destination string) error {
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aIface, err := ByExtension(destination)
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if err != nil {
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return err
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}
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a, ok := aIface.(Archiver)
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if !ok {
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return fmt.Errorf("format specified by destination filename is not an archive format: %s (%T)", destination, aIface)
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}
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return a.Archive(sources, destination)
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}
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// Unarchive unarchives the given archive file into the destination folder.
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// The archive format is selected implicitly.
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func Unarchive(source, destination string) error {
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uaIface, err := ByExtension(source)
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if err != nil {
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return err
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}
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u, ok := uaIface.(Unarchiver)
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if !ok {
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return fmt.Errorf("format specified by source filename is not an archive format: %s (%T)", source, uaIface)
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}
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return u.Unarchive(source, destination)
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}
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// Walk calls walkFn for each file within the given archive file.
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// The archive format is chosen implicitly.
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func Walk(archive string, walkFn WalkFunc) error {
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wIface, err := ByExtension(archive)
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if err != nil {
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return err
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}
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w, ok := wIface.(Walker)
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if !ok {
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return fmt.Errorf("format specified by archive filename is not a walker format: %s (%T)", archive, wIface)
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}
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return w.Walk(archive, walkFn)
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}
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// Extract extracts a single file from the given source archive. If the target
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// is a directory, the entire folder will be extracted into destination. The
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// archive format is chosen implicitly.
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func Extract(source, target, destination string) error {
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eIface, err := ByExtension(source)
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if err != nil {
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return err
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}
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e, ok := eIface.(Extractor)
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if !ok {
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return fmt.Errorf("format specified by source filename is not an extractor format: %s (%T)", source, eIface)
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}
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return e.Extract(source, target, destination)
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}
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// CompressFile is a convenience function to simply compress a file.
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// The compression algorithm is selected implicitly based on the
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// destination's extension.
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func CompressFile(source, destination string) error {
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cIface, err := ByExtension(destination)
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if err != nil {
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return err
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}
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c, ok := cIface.(Compressor)
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if !ok {
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return fmt.Errorf("format specified by destination filename is not a recognized compression algorithm: %s", destination)
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}
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return FileCompressor{Compressor: c}.CompressFile(source, destination)
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}
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// DecompressFile is a convenience function to simply decompress a file.
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// The decompression algorithm is selected implicitly based on the
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// source's extension.
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func DecompressFile(source, destination string) error {
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cIface, err := ByExtension(source)
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if err != nil {
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return err
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}
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c, ok := cIface.(Decompressor)
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if !ok {
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return fmt.Errorf("format specified by source filename is not a recognized compression algorithm: %s", source)
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}
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return FileCompressor{Decompressor: c}.DecompressFile(source, destination)
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}
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func fileExists(name string) bool {
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_, err := os.Stat(name)
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return !os.IsNotExist(err)
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}
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func mkdir(dirPath string, dirMode os.FileMode) error {
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err := os.MkdirAll(dirPath, dirMode)
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if err != nil {
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return fmt.Errorf("%s: making directory: %v", dirPath, err)
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}
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return nil
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}
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func writeNewFile(fpath string, in io.Reader, fm os.FileMode) error {
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err := os.MkdirAll(filepath.Dir(fpath), 0755)
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if err != nil {
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return fmt.Errorf("%s: making directory for file: %v", fpath, err)
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}
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out, err := os.Create(fpath)
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if err != nil {
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return fmt.Errorf("%s: creating new file: %v", fpath, err)
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}
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defer out.Close()
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err = out.Chmod(fm)
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if err != nil && runtime.GOOS != "windows" {
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return fmt.Errorf("%s: changing file mode: %v", fpath, err)
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}
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_, err = io.Copy(out, in)
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if err != nil {
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return fmt.Errorf("%s: writing file: %v", fpath, err)
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}
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return nil
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}
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func writeNewSymbolicLink(fpath string, target string) error {
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err := os.MkdirAll(filepath.Dir(fpath), 0755)
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if err != nil {
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return fmt.Errorf("%s: making directory for file: %v", fpath, err)
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}
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_, err = os.Lstat(fpath)
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if err == nil {
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err = os.Remove(fpath)
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if err != nil {
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return fmt.Errorf("%s: failed to unlink: %+v", fpath, err)
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}
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}
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err = os.Symlink(target, fpath)
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if err != nil {
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return fmt.Errorf("%s: making symbolic link for: %v", fpath, err)
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}
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return nil
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}
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func writeNewHardLink(fpath string, target string) error {
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err := os.MkdirAll(filepath.Dir(fpath), 0755)
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if err != nil {
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return fmt.Errorf("%s: making directory for file: %v", fpath, err)
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}
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_, err = os.Lstat(fpath)
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if err == nil {
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err = os.Remove(fpath)
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if err != nil {
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return fmt.Errorf("%s: failed to unlink: %+v", fpath, err)
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}
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}
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err = os.Link(target, fpath)
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if err != nil {
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return fmt.Errorf("%s: making hard link for: %v", fpath, err)
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}
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return nil
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}
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func isSymlink(fi os.FileInfo) bool {
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return fi.Mode()&os.ModeSymlink != 0
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}
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// within returns true if sub is within or equal to parent.
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func within(parent, sub string) bool {
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rel, err := filepath.Rel(parent, sub)
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if err != nil {
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return false
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}
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return !strings.Contains(rel, "..")
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}
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// multipleTopLevels returns true if the paths do not
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// share a common top-level folder.
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func multipleTopLevels(paths []string) bool {
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if len(paths) < 2 {
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return false
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}
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var lastTop string
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for _, p := range paths {
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p = strings.TrimPrefix(strings.Replace(p, `\`, "/", -1), "/")
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for {
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next := path.Dir(p)
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if next == "." {
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break
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}
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p = next
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}
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if lastTop == "" {
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lastTop = p
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}
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if p != lastTop {
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return true
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}
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}
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return false
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}
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// folderNameFromFileName returns a name for a folder
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// that is suitable based on the filename, which will
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// be stripped of its extensions.
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func folderNameFromFileName(filename string) string {
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base := filepath.Base(filename)
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firstDot := strings.Index(base, ".")
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if firstDot > -1 {
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return base[:firstDot]
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}
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return base
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}
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// makeNameInArchive returns the filename for the file given by fpath to be used within
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// the archive. sourceInfo is the FileInfo obtained by calling os.Stat on source, and baseDir
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// is an optional base directory that becomes the root of the archive. fpath should be the
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// unaltered file path of the file given to a filepath.WalkFunc.
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func makeNameInArchive(sourceInfo os.FileInfo, source, baseDir, fpath string) (string, error) {
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name := filepath.Base(fpath) // start with the file or dir name
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if sourceInfo.IsDir() {
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// preserve internal directory structure; that's the path components
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// between the source directory's leaf and this file's leaf
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dir, err := filepath.Rel(filepath.Dir(source), filepath.Dir(fpath))
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if err != nil {
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return "", err
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}
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// prepend the internal directory structure to the leaf name,
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// and convert path separators to forward slashes as per spec
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name = path.Join(filepath.ToSlash(dir), name)
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}
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return path.Join(baseDir, name), nil // prepend the base directory
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}
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// NameInArchive returns a name for the file at fpath suitable for
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// the inside of an archive. The source and its associated sourceInfo
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// is the path where walking a directory started, and if no directory
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// was walked, source may == fpath. The returned name is essentially
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// the components of the path between source and fpath, preserving
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// the internal directory structure.
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func NameInArchive(sourceInfo os.FileInfo, source, fpath string) (string, error) {
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return makeNameInArchive(sourceInfo, source, "", fpath)
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}
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// ByExtension returns an archiver and unarchiver, or compressor
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// and decompressor, based on the extension of the filename.
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func ByExtension(filename string) (interface{}, error) {
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var ec interface{}
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for _, c := range extCheckers {
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if err := c.CheckExt(filename); err == nil {
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ec = c
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break
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}
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}
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switch ec.(type) {
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case *Rar:
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return NewRar(), nil
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case *Tar:
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return NewTar(), nil
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case *TarBrotli:
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return NewTarBrotli(), nil
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case *TarBz2:
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return NewTarBz2(), nil
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case *TarGz:
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return NewTarGz(), nil
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case *TarLz4:
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return NewTarLz4(), nil
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case *TarSz:
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return NewTarSz(), nil
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case *TarXz:
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return NewTarXz(), nil
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case *TarZstd:
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return NewTarZstd(), nil
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case *Zip:
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return NewZip(), nil
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case *Gz:
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return NewGz(), nil
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case *Bz2:
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return NewBz2(), nil
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case *Lz4:
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return NewLz4(), nil
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case *Snappy:
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return NewSnappy(), nil
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case *Xz:
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return NewXz(), nil
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case *Zstd:
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return NewZstd(), nil
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}
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return nil, fmt.Errorf("format unrecognized by filename: %s", filename)
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}
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// ByHeader returns the unarchiver value that matches the input's
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// file header. It does not affect the current read position.
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|
// If the file's header is not a recognized archive format, then
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// ErrFormatNotRecognized will be returned.
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func ByHeader(input io.ReadSeeker) (Unarchiver, error) {
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var matcher Matcher
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for _, m := range matchers {
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ok, err := m.Match(input)
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if err != nil {
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return nil, fmt.Errorf("matching on format %s: %v", m, err)
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}
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if ok {
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matcher = m
|
|
break
|
|
}
|
|
}
|
|
switch matcher.(type) {
|
|
case *Zip:
|
|
return NewZip(), nil
|
|
case *Tar:
|
|
return NewTar(), nil
|
|
case *Rar:
|
|
return NewRar(), nil
|
|
}
|
|
return nil, ErrFormatNotRecognized
|
|
}
|
|
|
|
// extCheckers is a list of the format implementations
|
|
// that can check extensions. Only to be used for
|
|
// checking extensions - not any archival operations.
|
|
var extCheckers = []ExtensionChecker{
|
|
&TarBrotli{},
|
|
&TarBz2{},
|
|
&TarGz{},
|
|
&TarLz4{},
|
|
&TarSz{},
|
|
&TarXz{},
|
|
&TarZstd{},
|
|
&Rar{},
|
|
&Tar{},
|
|
&Zip{},
|
|
&Brotli{},
|
|
&Gz{},
|
|
&Bz2{},
|
|
&Lz4{},
|
|
&Snappy{},
|
|
&Xz{},
|
|
&Zstd{},
|
|
}
|
|
|
|
var matchers = []Matcher{
|
|
&Rar{},
|
|
&Tar{},
|
|
&Zip{},
|
|
}
|