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-rw-r--r--modules/packages/rubygems/metadata.go222
1 files changed, 222 insertions, 0 deletions
diff --git a/modules/packages/rubygems/metadata.go b/modules/packages/rubygems/metadata.go
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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.v2"
+)
+
+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"`
+ Email string `yaml:"email"`
+ 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[interface{}]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
+}