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// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package rubygems
import (
"archive/tar"
"compress/gzip"
"errors"
"io"
"regexp"
"strings"
"code.gitea.io/gitea/modules/validation"
"gopkg.in/yaml.v3"
)
var (
// ErrMissingMetadataFile indicates a missing metadata.gz file
ErrMissingMetadataFile = errors.New("Metadata file is missing")
// ErrInvalidName indicates an invalid id in the metadata.gz file
ErrInvalidName = errors.New("Metadata file contains an invalid name")
// ErrInvalidVersion indicates an invalid version in the metadata.gz file
ErrInvalidVersion = errors.New("Metadata file contains an invalid version")
)
var versionMatcher = regexp.MustCompile(`\A[0-9]+(?:\.[0-9a-zA-Z]+)*(?:-[0-9A-Za-z-]+(?:\.[0-9A-Za-z-]+)*)?\z`)
// Package represents a RubyGems package
type Package struct {
Name string
Version string
Metadata *Metadata
}
// Metadata represents the metadata of a RubyGems package
type Metadata struct {
Platform string `json:"platform,omitempty"`
Description string `json:"description,omitempty"`
Summary string `json:"summary,omitempty"`
Authors []string `json:"authors,omitempty"`
Licenses []string `json:"licenses,omitempty"`
RequiredRubyVersion []VersionRequirement `json:"required_ruby_version,omitempty"`
RequiredRubygemsVersion []VersionRequirement `json:"required_rubygems_version,omitempty"`
ProjectURL string `json:"project_url,omitempty"`
RuntimeDependencies []Dependency `json:"runtime_dependencies,omitempty"`
DevelopmentDependencies []Dependency `json:"development_dependencies,omitempty"`
}
// VersionRequirement represents a version restriction
type VersionRequirement struct {
Restriction string `json:"restriction"`
Version string `json:"version"`
}
// Dependency represents a dependency of a RubyGems package
type Dependency struct {
Name string `json:"name"`
Version []VersionRequirement `json:"version"`
}
type gemspec struct {
Name string `yaml:"name"`
Version struct {
Version string `yaml:"version"`
} `yaml:"version"`
Platform string `yaml:"platform"`
Authors []string `yaml:"authors"`
Autorequire interface{} `yaml:"autorequire"`
Bindir string `yaml:"bindir"`
CertChain []interface{} `yaml:"cert_chain"`
Date string `yaml:"date"`
Dependencies []struct {
Name string `yaml:"name"`
Requirement requirement `yaml:"requirement"`
Type string `yaml:"type"`
Prerelease bool `yaml:"prerelease"`
VersionRequirements requirement `yaml:"version_requirements"`
} `yaml:"dependencies"`
Description string `yaml:"description"`
Executables []string `yaml:"executables"`
Extensions []interface{} `yaml:"extensions"`
ExtraRdocFiles []string `yaml:"extra_rdoc_files"`
Files []string `yaml:"files"`
Homepage string `yaml:"homepage"`
Licenses []string `yaml:"licenses"`
Metadata struct {
BugTrackerURI string `yaml:"bug_tracker_uri"`
ChangelogURI string `yaml:"changelog_uri"`
DocumentationURI string `yaml:"documentation_uri"`
SourceCodeURI string `yaml:"source_code_uri"`
} `yaml:"metadata"`
PostInstallMessage interface{} `yaml:"post_install_message"`
RdocOptions []interface{} `yaml:"rdoc_options"`
RequirePaths []string `yaml:"require_paths"`
RequiredRubyVersion requirement `yaml:"required_ruby_version"`
RequiredRubygemsVersion requirement `yaml:"required_rubygems_version"`
Requirements []interface{} `yaml:"requirements"`
RubygemsVersion string `yaml:"rubygems_version"`
SigningKey interface{} `yaml:"signing_key"`
SpecificationVersion int `yaml:"specification_version"`
Summary string `yaml:"summary"`
TestFiles []interface{} `yaml:"test_files"`
}
type requirement struct {
Requirements [][]interface{} `yaml:"requirements"`
}
// AsVersionRequirement converts into []VersionRequirement
func (r requirement) AsVersionRequirement() []VersionRequirement {
requirements := make([]VersionRequirement, 0, len(r.Requirements))
for _, req := range r.Requirements {
if len(req) != 2 {
continue
}
restriction, ok := req[0].(string)
if !ok {
continue
}
vm, ok := req[1].(map[string]interface{})
if !ok {
continue
}
versionInt, ok := vm["version"]
if !ok {
continue
}
version, ok := versionInt.(string)
if !ok || version == "0" {
continue
}
requirements = append(requirements, VersionRequirement{
Restriction: restriction,
Version: version,
})
}
return requirements
}
// ParsePackageMetaData parses the metadata of a Gem package file
func ParsePackageMetaData(r io.Reader) (*Package, error) {
archive := tar.NewReader(r)
for {
hdr, err := archive.Next()
if err == io.EOF {
break
}
if err != nil {
return nil, err
}
if hdr.Name == "metadata.gz" {
return parseMetadataFile(archive)
}
}
return nil, ErrMissingMetadataFile
}
func parseMetadataFile(r io.Reader) (*Package, error) {
zr, err := gzip.NewReader(r)
if err != nil {
return nil, err
}
defer zr.Close()
var spec gemspec
if err := yaml.NewDecoder(zr).Decode(&spec); err != nil {
return nil, err
}
if len(spec.Name) == 0 || strings.Contains(spec.Name, "/") {
return nil, ErrInvalidName
}
if !versionMatcher.MatchString(spec.Version.Version) {
return nil, ErrInvalidVersion
}
if !validation.IsValidURL(spec.Homepage) {
spec.Homepage = ""
}
if !validation.IsValidURL(spec.Metadata.SourceCodeURI) {
spec.Metadata.SourceCodeURI = ""
}
m := &Metadata{
Platform: spec.Platform,
Description: spec.Description,
Summary: spec.Summary,
Authors: spec.Authors,
Licenses: spec.Licenses,
ProjectURL: spec.Homepage,
RequiredRubyVersion: spec.RequiredRubyVersion.AsVersionRequirement(),
RequiredRubygemsVersion: spec.RequiredRubygemsVersion.AsVersionRequirement(),
DevelopmentDependencies: make([]Dependency, 0, 5),
RuntimeDependencies: make([]Dependency, 0, 5),
}
for _, gemdep := range spec.Dependencies {
dep := Dependency{
Name: gemdep.Name,
Version: gemdep.Requirement.AsVersionRequirement(),
}
if gemdep.Type == ":runtime" {
m.RuntimeDependencies = append(m.RuntimeDependencies, dep)
} else {
m.DevelopmentDependencies = append(m.DevelopmentDependencies, dep)
}
}
return &Package{
Name: spec.Name,
Version: spec.Version.Version,
Metadata: m,
}, nil
}
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