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// Copyright 2023 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package goproxy
import (
"archive/zip"
"fmt"
"io"
"path"
"strings"
"code.gitea.io/gitea/modules/util"
)
const (
PropertyGoMod = "go.mod"
maxGoModFileSize = 16 * 1024 * 1024 // https://go.dev/ref/mod#zip-path-size-constraints
)
var (
ErrInvalidStructure = util.NewInvalidArgumentErrorf("package has invalid structure")
ErrGoModFileTooLarge = util.NewInvalidArgumentErrorf("go.mod file is too large")
)
type Package struct {
Name string
Version string
GoMod string
}
// ParsePackage parses the Go package file
// https://go.dev/ref/mod#zip-files
func ParsePackage(r io.ReaderAt, size int64) (*Package, error) {
archive, err := zip.NewReader(r, size)
if err != nil {
return nil, err
}
var p *Package
for _, file := range archive.File {
nameAndVersion := path.Dir(file.Name)
parts := strings.SplitN(nameAndVersion, "@", 2)
if len(parts) != 2 {
continue
}
versionParts := strings.SplitN(parts[1], "/", 2)
if p == nil {
p = &Package{
Name: strings.TrimSuffix(nameAndVersion, "@"+parts[1]),
Version: versionParts[0],
}
}
if len(versionParts) > 1 {
// files are expected in the "root" folder
continue
}
if path.Base(file.Name) == "go.mod" {
if file.UncompressedSize64 > maxGoModFileSize {
return nil, ErrGoModFileTooLarge
}
f, err := archive.Open(file.Name)
if err != nil {
return nil, err
}
defer f.Close()
bytes, err := io.ReadAll(&io.LimitedReader{R: f, N: maxGoModFileSize})
if err != nil {
return nil, err
}
p.GoMod = string(bytes)
return p, nil
}
}
if p == nil {
return nil, ErrInvalidStructure
}
p.GoMod = fmt.Sprintf("module %s", p.Name)
return p, nil
}
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