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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 npm
import (
"bytes"
"crypto/sha1"
"crypto/sha512"
"encoding/base64"
"errors"
"fmt"
"io"
"regexp"
"strings"
"time"
"code.gitea.io/gitea/modules/json"
"code.gitea.io/gitea/modules/validation"
"github.com/hashicorp/go-version"
)
var (
// ErrInvalidPackage indicates an invalid package
ErrInvalidPackage = errors.New("The package is invalid")
// ErrInvalidPackageName indicates an invalid name
ErrInvalidPackageName = errors.New("The package name is invalid")
// ErrInvalidPackageVersion indicates an invalid version
ErrInvalidPackageVersion = errors.New("The package version is invalid")
// ErrInvalidAttachment indicates a invalid attachment
ErrInvalidAttachment = errors.New("The package attachment is invalid")
// ErrInvalidIntegrity indicates an integrity validation error
ErrInvalidIntegrity = errors.New("Failed to validate integrity")
)
var nameMatch = regexp.MustCompile(`\A((@[^\s\/~'!\(\)\*]+?)[\/])?([^_.][^\s\/~'!\(\)\*]+)\z`)
// Package represents a npm package
type Package struct {
Name string
Version string
DistTags []string
Metadata Metadata
Filename string
Data []byte
}
// PackageMetadata https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#package
type PackageMetadata struct {
ID string `json:"_id"`
Name string `json:"name"`
Description string `json:"description"`
DistTags map[string]string `json:"dist-tags,omitempty"`
Versions map[string]*PackageMetadataVersion `json:"versions"`
Readme string `json:"readme,omitempty"`
Maintainers []User `json:"maintainers,omitempty"`
Time map[string]time.Time `json:"time,omitempty"`
Homepage string `json:"homepage,omitempty"`
Keywords []string `json:"keywords,omitempty"`
Repository Repository `json:"repository,omitempty"`
Author User `json:"author"`
ReadmeFilename string `json:"readmeFilename,omitempty"`
Users map[string]bool `json:"users,omitempty"`
License string `json:"license,omitempty"`
}
// PackageMetadataVersion https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#version
type PackageMetadataVersion struct {
ID string `json:"_id"`
Name string `json:"name"`
Version string `json:"version"`
Description string `json:"description"`
Author User `json:"author"`
Homepage string `json:"homepage,omitempty"`
License string `json:"license,omitempty"`
Repository Repository `json:"repository,omitempty"`
Keywords []string `json:"keywords,omitempty"`
Dependencies map[string]string `json:"dependencies,omitempty"`
DevDependencies map[string]string `json:"devDependencies,omitempty"`
PeerDependencies map[string]string `json:"peerDependencies,omitempty"`
OptionalDependencies map[string]string `json:"optionalDependencies,omitempty"`
Readme string `json:"readme,omitempty"`
Dist PackageDistribution `json:"dist"`
Maintainers []User `json:"maintainers,omitempty"`
}
// PackageDistribution https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#version
type PackageDistribution struct {
Integrity string `json:"integrity"`
Shasum string `json:"shasum"`
Tarball string `json:"tarball"`
FileCount int `json:"fileCount,omitempty"`
UnpackedSize int `json:"unpackedSize,omitempty"`
NpmSignature string `json:"npm-signature,omitempty"`
}
// User https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#package
type User struct {
Username string `json:"username,omitempty"`
Name string `json:"name"`
Email string `json:"email,omitempty"`
URL string `json:"url,omitempty"`
}
// UnmarshalJSON is needed because User objects can be strings or objects
func (u *User) UnmarshalJSON(data []byte) error {
switch data[0] {
case '"':
if err := json.Unmarshal(data, &u.Name); err != nil {
return err
}
case '{':
var tmp struct {
Username string `json:"username"`
Name string `json:"name"`
Email string `json:"email"`
URL string `json:"url"`
}
if err := json.Unmarshal(data, &tmp); err != nil {
return err
}
u.Username = tmp.Username
u.Name = tmp.Name
u.Email = tmp.Email
u.URL = tmp.URL
}
return nil
}
// Repository https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#version
type Repository struct {
Type string `json:"type"`
URL string `json:"url"`
}
// PackageAttachment https://github.com/npm/registry/blob/master/docs/REGISTRY-API.md#package
type PackageAttachment struct {
ContentType string `json:"content_type"`
Data string `json:"data"`
Length int `json:"length"`
}
type packageUpload struct {
PackageMetadata
Attachments map[string]*PackageAttachment `json:"_attachments"`
}
// ParsePackage parses the content into a npm package
func ParsePackage(r io.Reader) (*Package, error) {
var upload packageUpload
if err := json.NewDecoder(r).Decode(&upload); err != nil {
return nil, err
}
for _, meta := range upload.Versions {
if !validateName(meta.Name) {
return nil, ErrInvalidPackageName
}
v, err := version.NewSemver(meta.Version)
if err != nil {
return nil, ErrInvalidPackageVersion
}
scope := ""
name := meta.Name
nameParts := strings.SplitN(meta.Name, "/", 2)
if len(nameParts) == 2 {
scope = nameParts[0]
name = nameParts[1]
}
if !validation.IsValidURL(meta.Homepage) {
meta.Homepage = ""
}
p := &Package{
Name: meta.Name,
Version: v.String(),
DistTags: make([]string, 0, 1),
Metadata: Metadata{
Scope: scope,
Name: name,
Description: meta.Description,
Author: meta.Author.Name,
License: meta.License,
ProjectURL: meta.Homepage,
Keywords: meta.Keywords,
Dependencies: meta.Dependencies,
DevelopmentDependencies: meta.DevDependencies,
PeerDependencies: meta.PeerDependencies,
OptionalDependencies: meta.OptionalDependencies,
Readme: meta.Readme,
},
}
for tag := range upload.DistTags {
p.DistTags = append(p.DistTags, tag)
}
p.Filename = strings.ToLower(fmt.Sprintf("%s-%s.tgz", name, p.Version))
attachment := func() *PackageAttachment {
for _, a := range upload.Attachments {
return a
}
return nil
}()
if attachment == nil || len(attachment.Data) == 0 {
return nil, ErrInvalidAttachment
}
data, err := base64.StdEncoding.DecodeString(attachment.Data)
if err != nil {
return nil, ErrInvalidAttachment
}
p.Data = data
integrity := strings.SplitN(meta.Dist.Integrity, "-", 2)
if len(integrity) != 2 {
return nil, ErrInvalidIntegrity
}
integrityHash, err := base64.StdEncoding.DecodeString(integrity[1])
if err != nil {
return nil, ErrInvalidIntegrity
}
var hash []byte
switch integrity[0] {
case "sha1":
tmp := sha1.Sum(data)
hash = tmp[:]
case "sha512":
tmp := sha512.Sum512(data)
hash = tmp[:]
}
if !bytes.Equal(integrityHash, hash) {
return nil, ErrInvalidIntegrity
}
return p, nil
}
return nil, ErrInvalidPackage
}
func validateName(name string) bool {
if strings.TrimSpace(name) != name {
return false
}
if len(name) == 0 || len(name) > 214 {
return false
}
return nameMatch.MatchString(name)
}
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