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// Copyright 2022 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT
package pub
import (
"archive/tar"
"compress/gzip"
"errors"
"io"
"regexp"
"strings"
"code.gitea.io/gitea/modules/validation"
"github.com/hashicorp/go-version"
"gopkg.in/yaml.v3"
)
var (
ErrMissingPubspecFile = errors.New("Pubspec file is missing")
ErrPubspecFileTooLarge = errors.New("Pubspec file is too large")
ErrInvalidName = errors.New("Package name is invalid")
ErrInvalidVersion = errors.New("Package version is invalid")
)
var namePattern = regexp.MustCompile(`\A[a-zA-Z_][a-zA-Z0-9_]*\z`)
// https://github.com/dart-lang/pub-dev/blob/4d582302a8d10152a5cd6129f65bf4f4dbca239d/pkg/pub_package_reader/lib/pub_package_reader.dart#L143
const maxPubspecFileSize = 128 * 1024
// Package represents a Pub package
type Package struct {
Name string
Version string
Metadata *Metadata
}
// Metadata represents the metadata of a Pub package
type Metadata struct {
Description string `json:"description,omitempty"`
ProjectURL string `json:"project_url,omitempty"`
RepositoryURL string `json:"repository_url,omitempty"`
DocumentationURL string `json:"documentation_url,omitempty"`
Readme string `json:"readme,omitempty"`
Pubspec interface{} `json:"pubspec"`
}
type pubspecPackage struct {
Name string `yaml:"name"`
Version string `yaml:"version"`
Description string `yaml:"description"`
Homepage string `yaml:"homepage"`
Repository string `yaml:"repository"`
Documentation string `yaml:"documentation"`
}
// ParsePackage parses the Pub package file
func ParsePackage(r io.Reader) (*Package, error) {
gzr, err := gzip.NewReader(r)
if err != nil {
return nil, err
}
defer gzr.Close()
var p *Package
var readme string
tr := tar.NewReader(gzr)
for {
hd, err := tr.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if hd.Typeflag != tar.TypeReg {
continue
}
if hd.Name == "pubspec.yaml" {
if hd.Size > maxPubspecFileSize {
return nil, ErrPubspecFileTooLarge
}
p, err = ParsePubspecMetadata(tr)
if err != nil {
return nil, err
}
} else if strings.ToLower(hd.Name) == "readme.md" {
data, err := io.ReadAll(tr)
if err != nil {
return nil, err
}
readme = string(data)
}
}
if p == nil {
return nil, ErrMissingPubspecFile
}
p.Metadata.Readme = readme
return p, nil
}
// ParsePubspecMetadata parses a Pubspec file to retrieve the metadata of a Pub package
func ParsePubspecMetadata(r io.Reader) (*Package, error) {
buf, err := io.ReadAll(io.LimitReader(r, maxPubspecFileSize))
if err != nil {
return nil, err
}
var p pubspecPackage
if err := yaml.Unmarshal(buf, &p); err != nil {
return nil, err
}
if !namePattern.MatchString(p.Name) {
return nil, ErrInvalidName
}
v, err := version.NewSemver(p.Version)
if err != nil {
return nil, ErrInvalidVersion
}
if !validation.IsValidURL(p.Homepage) {
p.Homepage = ""
}
if !validation.IsValidURL(p.Repository) {
p.Repository = ""
}
var pubspec interface{}
if err := yaml.Unmarshal(buf, &pubspec); err != nil {
return nil, err
}
return &Package{
Name: p.Name,
Version: v.String(),
Metadata: &Metadata{
Description: p.Description,
ProjectURL: p.Homepage,
RepositoryURL: p.Repository,
DocumentationURL: p.Documentation,
Pubspec: pubspec,
},
}, nil
}
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