332 lines
6.8 KiB
Go
332 lines
6.8 KiB
Go
package activitypub
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import (
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"bytes"
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"encoding/gob"
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"fmt"
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"io"
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"net/url"
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"path/filepath"
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"strings"
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"github.com/valyala/fastjson"
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)
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const (
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// ActivityBaseURI the URI for the ActivityStreams namespace
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ActivityBaseURI = IRI("https://www.w3.org/ns/activitystreams")
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// SecurityContextURI the URI for the security namespace (for an Actor's PublicKey)
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SecurityContextURI = IRI("https://w3id.org/security/v1")
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// PublicNS is the reference to the Public entity in the ActivityStreams namespace
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PublicNS = ActivityBaseURI + "#Public"
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)
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// JsonLDContext is a slice of IRIs that form the default context for the objects in the
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// GoActivitypub vocabulary.
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// It does not represent just the default ActivityStreams public namespace, but it also
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// has the W3 Permanent Identifier Community Group's Security namespace, which appears
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// in the Actor type objects, which contain public key related data.
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var JsonLDContext = []IRI{
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ActivityBaseURI,
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SecurityContextURI,
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}
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type (
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// IRI is a Internationalized Resource Identifiers (IRIs) RFC3987
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IRI string
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IRIs []IRI
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)
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func (i IRI) Format(s fmt.State, verb rune) {
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switch verb {
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case 's', 'v':
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u, _ := i.URL()
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u.RawQuery, _ = url.QueryUnescape(u.RawQuery)
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io.WriteString(s, u.String())
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}
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}
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// String returns the String value of the IRI object
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func (i IRI) String() string {
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return string(i)
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}
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// GetLink
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func (i IRI) GetLink() IRI {
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return i
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}
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// URL
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func (i IRI) URL() (*url.URL, error) {
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return url.Parse(i.String())
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}
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// UnmarshalJSON decodes an incoming JSON document into the receiver object.
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func (i *IRI) UnmarshalJSON(s []byte) error {
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*i = IRI(strings.Trim(string(s), "\""))
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return nil
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}
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// MarshalJSON encodes the receiver object to a JSON document.
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func (i IRI) MarshalJSON() ([]byte, error) {
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if i == "" {
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return nil, nil
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}
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b := make([]byte, 0)
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write(&b, '"')
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writeS(&b, i.String())
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write(&b, '"')
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return b, nil
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}
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// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
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func (i *IRI) UnmarshalBinary(data []byte) error {
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return i.GobDecode(data)
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}
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// MarshalBinary implements the encoding.BinaryMarshaler interface.
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func (i IRI) MarshalBinary() ([]byte, error) {
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return i.GobEncode()
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}
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// GobEncode
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func (i IRI) GobEncode() ([]byte, error) {
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return []byte(i), nil
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}
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// GobEncode
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func (i IRIs) GobEncode() ([]byte, error) {
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if len(i) == 0 {
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return []byte{}, nil
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}
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b := bytes.Buffer{}
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gg := gob.NewEncoder(&b)
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bb := make([][]byte, 0)
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for _, iri := range i {
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bb = append(bb, []byte(iri))
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}
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if err := gg.Encode(bb); err != nil {
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return nil, err
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}
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return b.Bytes(), nil
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}
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// GobDecode
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func (i *IRI) GobDecode(data []byte) error {
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*i = IRI(data)
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return nil
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}
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func (i *IRIs) GobDecode(data []byte) error {
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if len(data) == 0 {
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// NOTE(marius): this behaviour diverges from vanilla gob package
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return nil
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}
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bb := make([][]byte, 0)
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if err := gob.NewDecoder(bytes.NewReader(data)).Decode(&bb); err != nil {
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return err
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}
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for _, b := range bb {
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*i = append(*i, IRI(b))
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}
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return nil
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}
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// AddPath concatenates el elements as a path to i
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func (i IRI) AddPath(el ...string) IRI {
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iri := strings.TrimRight(i.String(), "/")
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return IRI(iri + filepath.Clean(filepath.Join("/", filepath.Join(el...))))
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}
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// GetID
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func (i IRI) GetID() ID {
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return i
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}
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// GetType
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func (i IRI) GetType() ActivityVocabularyType {
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return IRIType
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}
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// IsLink
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func (i IRI) IsLink() bool {
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return true
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}
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// IsObject
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func (i IRI) IsObject() bool {
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return false
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}
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// IsCollection returns false for IRI objects
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func (i IRI) IsCollection() bool {
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return false
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}
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// FlattenToIRI checks if Item can be flatten to an IRI and returns it if so
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func FlattenToIRI(it Item) Item {
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if !IsNil(it) && it.IsObject() && len(it.GetLink()) > 0 {
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return it.GetLink()
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}
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return it
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}
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func (i IRIs) MarshalJSON() ([]byte, error) {
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b := make([]byte, 0)
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if len(i) == 0 {
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return nil, nil
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}
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writeCommaIfNotEmpty := func(notEmpty bool) {
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if notEmpty {
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writeS(&b, ",")
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}
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}
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write(&b, '[')
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for k, iri := range i {
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writeCommaIfNotEmpty(k > 0)
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write(&b, '"')
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writeS(&b, iri.String())
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write(&b, '"')
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}
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write(&b, ']')
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return b, nil
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}
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func (i *IRIs) UnmarshalJSON(data []byte) error {
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if i == nil {
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return nil
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}
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p := fastjson.Parser{}
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val, err := p.ParseBytes(data)
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if err != nil {
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return err
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}
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switch val.Type() {
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case fastjson.TypeString:
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if iri, ok := asIRI(val); ok && len(iri) > 0 {
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*i = append(*i, iri)
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}
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case fastjson.TypeArray:
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for _, v := range val.GetArray() {
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if iri, ok := asIRI(v); ok && len(iri) > 0 {
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*i = append(*i, iri)
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}
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}
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}
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return nil
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}
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// Contains verifies if IRIs array contains the received one
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func (i IRIs) Contains(r IRI) bool {
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if len(i) == 0 {
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return false
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}
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for _, iri := range i {
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if r.Equals(iri, false) {
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return true
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}
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}
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return false
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}
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func validURL(u *url.URL) bool {
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return len(u.Scheme) > 0 && len(u.Host) > 0
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}
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// Equals verifies if our receiver IRI is equals with the "with" IRI
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// It ignores the protocol
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// It tries to use the URL representation if possible and fallback to string comparison if unable to convert
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// In URL representation checks hostname in a case insensitive way and the path and
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func (i IRI) Equals(with IRI, checkScheme bool) bool {
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u, e := i.URL()
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uw, ew := with.URL()
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if e != nil || ew != nil || !validURL(u) || !validURL(uw) {
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return strings.ToLower(i.String()) == strings.ToLower(with.String())
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}
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if checkScheme {
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if strings.ToLower(u.Scheme) != strings.ToLower(uw.Scheme) {
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return false
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}
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}
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if strings.ToLower(u.Host) != strings.ToLower(uw.Host) {
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return false
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}
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if filepath.Clean(u.Path) != filepath.Clean(uw.Path) {
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return false
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}
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uq := u.Query()
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uwq := uw.Query()
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if len(uq) != len(uwq) {
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return false
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}
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for k, uqv := range uq {
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uwqv, ok := uwq[k]
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if !ok {
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return false
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}
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if len(uqv) != len(uwqv) {
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return false
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}
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for _, uqvv := range uqv {
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eq := false
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for _, uwqvv := range uwqv {
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if uwqvv == uqvv {
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eq = true
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continue
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}
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}
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if !eq {
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return false
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}
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}
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}
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return true
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}
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func hostSplit(h string) (string, string) {
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pieces := strings.Split(h, ":")
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if len(pieces) == 0 {
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return "", ""
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}
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if len(pieces) == 1 {
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return pieces[0], ""
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}
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return pieces[0], pieces[1]
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}
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func (i IRI) Contains(what IRI, checkScheme bool) bool {
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u, e := i.URL()
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uw, ew := what.URL()
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if e != nil || ew != nil {
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return strings.Contains(i.String(), what.String())
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}
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if checkScheme {
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if u.Scheme != uw.Scheme {
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return false
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}
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}
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uHost, _ := hostSplit(u.Host)
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uwHost, _ := hostSplit(uw.Host)
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if uHost != uwHost {
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return false
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}
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p := u.Path
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if p != "" {
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p = filepath.Clean(p)
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}
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pw := uw.Path
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if pw != "" {
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pw = filepath.Clean(pw)
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}
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return strings.Contains(p, pw)
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}
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func (i IRI) ItemsMatch(col ...Item) bool {
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for _, it := range col {
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if match := it.GetLink().Contains(i, false); !match {
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return false
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}
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}
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return true
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}
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