430 lines
9.5 KiB
Go
430 lines
9.5 KiB
Go
package activitypub
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/gob"
|
|
"fmt"
|
|
"io"
|
|
"net/url"
|
|
"path/filepath"
|
|
"strings"
|
|
|
|
"github.com/valyala/fastjson"
|
|
)
|
|
|
|
const (
|
|
// ActivityBaseURI the URI for the ActivityStreams namespace
|
|
ActivityBaseURI = IRI("https://www.w3.org/ns/activitystreams")
|
|
// SecurityContextURI the URI for the security namespace (for an Actor's PublicKey)
|
|
SecurityContextURI = IRI("https://w3id.org/security/v1")
|
|
// PublicNS is the reference to the Public entity in the ActivityStreams namespace.
|
|
//
|
|
// Public Addressing
|
|
//
|
|
// https://www.w3.org/TR/activitypub/#public-addressing
|
|
//
|
|
// In addition to [ActivityStreams] collections and objects, Activities may additionally be addressed to the
|
|
// special "public" collection, with the identifier https://www.w3.org/ns/activitystreams#Public. For example:
|
|
//
|
|
// {
|
|
// "@context": "https://www.w3.org/ns/activitystreams",
|
|
// "id": "https://www.w3.org/ns/activitystreams#Public",
|
|
// "type": "Collection"
|
|
// }
|
|
// Activities addressed to this special URI shall be accessible to all users, without authentication.
|
|
// Implementations MUST NOT deliver to the "public" special collection; it is not capable of receiving
|
|
// actual activities. However, actors MAY have a sharedInbox endpoint which is available for efficient
|
|
// shared delivery of public posts (as well as posts to followers-only); see 7.1.3 Shared Inbox Delivery.
|
|
//
|
|
// NOTE
|
|
// Compacting an ActivityStreams object using the ActivityStreams JSON-LD context might result in
|
|
// https://www.w3.org/ns/activitystreams#Public being represented as simply Public or as:Public which are valid
|
|
// representations of the Public collection. Implementations which treat ActivityStreams objects as simply JSON
|
|
// rather than converting an incoming activity over to a local context using JSON-LD tooling should be aware
|
|
// of this and should be prepared to accept all three representations.
|
|
PublicNS = ActivityBaseURI + "#Public"
|
|
)
|
|
|
|
// JsonLDContext is a slice of IRIs that form the default context for the objects in the
|
|
// GoActivitypub vocabulary.
|
|
// It does not represent just the default ActivityStreams public namespace, but it also
|
|
// has the W3 Permanent Identifier Community Group's Security namespace, which appears
|
|
// in the Actor type objects, which contain public key related data.
|
|
var JsonLDContext = []IRI{
|
|
ActivityBaseURI,
|
|
SecurityContextURI,
|
|
}
|
|
|
|
type (
|
|
// IRI is a Internationalized Resource Identifiers (IRIs) RFC3987
|
|
IRI string
|
|
IRIs []IRI
|
|
)
|
|
|
|
func (i IRI) Format(s fmt.State, verb rune) {
|
|
switch verb {
|
|
case 's', 'v':
|
|
_, _ = io.WriteString(s, i.String())
|
|
}
|
|
}
|
|
|
|
// String returns the String value of the IRI object
|
|
func (i IRI) String() string {
|
|
return string(i)
|
|
}
|
|
|
|
// GetLink
|
|
func (i IRI) GetLink() IRI {
|
|
return i
|
|
}
|
|
|
|
// URL
|
|
func (i IRI) URL() (*url.URL, error) {
|
|
return url.Parse(i.String())
|
|
}
|
|
|
|
// UnmarshalJSON decodes an incoming JSON document into the receiver object.
|
|
func (i *IRI) UnmarshalJSON(s []byte) error {
|
|
*i = IRI(strings.Trim(string(s), "\""))
|
|
return nil
|
|
}
|
|
|
|
// MarshalJSON encodes the receiver object to a JSON document.
|
|
func (i IRI) MarshalJSON() ([]byte, error) {
|
|
if i == "" {
|
|
return nil, nil
|
|
}
|
|
b := make([]byte, 0)
|
|
JSONWrite(&b, '"')
|
|
JSONWriteS(&b, i.String())
|
|
JSONWrite(&b, '"')
|
|
return b, nil
|
|
}
|
|
|
|
// UnmarshalBinary implements the encoding.BinaryUnmarshaler interface.
|
|
func (i *IRI) UnmarshalBinary(data []byte) error {
|
|
return i.GobDecode(data)
|
|
}
|
|
|
|
// MarshalBinary implements the encoding.BinaryMarshaler interface.
|
|
func (i IRI) MarshalBinary() ([]byte, error) {
|
|
return i.GobEncode()
|
|
}
|
|
|
|
// GobEncode
|
|
func (i IRI) GobEncode() ([]byte, error) {
|
|
return []byte(i), nil
|
|
}
|
|
|
|
// GobEncode
|
|
func (i IRIs) GobEncode() ([]byte, error) {
|
|
if len(i) == 0 {
|
|
return []byte{}, nil
|
|
}
|
|
b := bytes.Buffer{}
|
|
gg := gob.NewEncoder(&b)
|
|
bb := make([][]byte, 0)
|
|
for _, iri := range i {
|
|
bb = append(bb, []byte(iri))
|
|
}
|
|
if err := gg.Encode(bb); err != nil {
|
|
return nil, err
|
|
}
|
|
return b.Bytes(), nil
|
|
}
|
|
|
|
// GobDecode
|
|
func (i *IRI) GobDecode(data []byte) error {
|
|
*i = IRI(data)
|
|
return nil
|
|
}
|
|
|
|
func (i *IRIs) GobDecode(data []byte) error {
|
|
if len(data) == 0 {
|
|
// NOTE(marius): this behaviour diverges from vanilla gob package
|
|
return nil
|
|
}
|
|
err := gob.NewDecoder(bytes.NewReader(data)).Decode(i)
|
|
if err == nil {
|
|
return nil
|
|
}
|
|
bb := make([][]byte, 0)
|
|
err = gob.NewDecoder(bytes.NewReader(data)).Decode(&bb)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
for _, b := range bb {
|
|
*i = append(*i, IRI(b))
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// AddPath concatenates el elements as a path to i
|
|
func (i IRI) AddPath(el ...string) IRI {
|
|
iri := strings.TrimRight(i.String(), "/")
|
|
return IRI(iri + filepath.Clean(filepath.Join("/", filepath.Join(el...))))
|
|
}
|
|
|
|
// GetID
|
|
func (i IRI) GetID() ID {
|
|
return i
|
|
}
|
|
|
|
// GetType
|
|
func (i IRI) GetType() ActivityVocabularyType {
|
|
return IRIType
|
|
}
|
|
|
|
// IsLink
|
|
func (i IRI) IsLink() bool {
|
|
return true
|
|
}
|
|
|
|
// IsObject
|
|
func (i IRI) IsObject() bool {
|
|
return false
|
|
}
|
|
|
|
// IsCollection returns false for IRI objects
|
|
func (i IRI) IsCollection() bool {
|
|
return false
|
|
}
|
|
|
|
// FlattenToIRI checks if Item can be flatten to an IRI and returns it if so
|
|
func FlattenToIRI(it Item) Item {
|
|
if !IsNil(it) && it.IsObject() && len(it.GetLink()) > 0 {
|
|
return it.GetLink()
|
|
}
|
|
return it
|
|
}
|
|
|
|
func (i IRIs) MarshalJSON() ([]byte, error) {
|
|
if len(i) == 0 {
|
|
return []byte{'[', ']'}, nil
|
|
}
|
|
b := make([]byte, 0)
|
|
writeCommaIfNotEmpty := func(notEmpty bool) {
|
|
if notEmpty {
|
|
JSONWriteS(&b, ",")
|
|
}
|
|
}
|
|
JSONWrite(&b, '[')
|
|
for k, iri := range i {
|
|
writeCommaIfNotEmpty(k > 0)
|
|
JSONWrite(&b, '"')
|
|
JSONWriteS(&b, iri.String())
|
|
JSONWrite(&b, '"')
|
|
}
|
|
JSONWrite(&b, ']')
|
|
return b, nil
|
|
}
|
|
|
|
func (i *IRIs) UnmarshalJSON(data []byte) error {
|
|
if i == nil {
|
|
return nil
|
|
}
|
|
p := fastjson.Parser{}
|
|
val, err := p.ParseBytes(data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
switch val.Type() {
|
|
case fastjson.TypeString:
|
|
if iri, ok := asIRI(val); ok && len(iri) > 0 {
|
|
*i = append(*i, iri)
|
|
}
|
|
case fastjson.TypeArray:
|
|
for _, v := range val.GetArray() {
|
|
if iri, ok := asIRI(v); ok && len(iri) > 0 {
|
|
*i = append(*i, iri)
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// GetID returns the ID corresponding to ItemCollection
|
|
func (i IRIs) GetID() ID {
|
|
return EmptyID
|
|
}
|
|
|
|
// GetLink returns the empty IRI
|
|
func (i IRIs) GetLink() IRI {
|
|
return EmptyIRI
|
|
}
|
|
|
|
// GetType returns the ItemCollection's type
|
|
func (i IRIs) GetType() ActivityVocabularyType {
|
|
return CollectionOfIRIs
|
|
}
|
|
|
|
// IsLink returns false for an ItemCollection object
|
|
func (i IRIs) IsLink() bool {
|
|
return false
|
|
}
|
|
|
|
// IsObject returns true for a ItemCollection object
|
|
func (i IRIs) IsObject() bool {
|
|
return false
|
|
}
|
|
|
|
// IsCollection returns true for IRI slices
|
|
func (i IRIs) IsCollection() bool {
|
|
return true
|
|
}
|
|
|
|
// Append facilitates adding elements to IRI slices
|
|
// and ensures IRIs implements the Collection interface
|
|
func (i *IRIs) Append(it ...Item) error {
|
|
for _, ob := range it {
|
|
if (*i).Contains(ob.GetLink()) {
|
|
continue
|
|
}
|
|
*i = append(*i, ob.GetLink())
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (i *IRIs) Collection() ItemCollection {
|
|
res := make(ItemCollection, len(*i))
|
|
for k, iri := range *i {
|
|
res[k] = iri
|
|
}
|
|
return res
|
|
}
|
|
|
|
func (i *IRIs) Count() uint {
|
|
return uint(len(*i))
|
|
}
|
|
|
|
// Contains verifies if IRIs array contains the received one
|
|
func (i IRIs) Contains(r Item) bool {
|
|
if len(i) == 0 {
|
|
return false
|
|
}
|
|
for _, iri := range i {
|
|
if r.GetLink().Equals(iri, false) {
|
|
return true
|
|
}
|
|
}
|
|
return false
|
|
}
|
|
|
|
func validURL(u *url.URL) bool {
|
|
return len(u.Scheme) > 0 && len(u.Host) > 0
|
|
}
|
|
|
|
// Equals verifies if our receiver IRI is equals with the "with" IRI
|
|
func (i IRI) Equals(with IRI, checkScheme bool) bool {
|
|
if checkScheme {
|
|
if strings.EqualFold(string(i), string(with)) {
|
|
return true
|
|
}
|
|
} else {
|
|
is := string(i)
|
|
ws := string(with)
|
|
ip := strings.Index(is, "://")
|
|
if ip < 0 {
|
|
ip = 0
|
|
}
|
|
wp := strings.Index(ws, "://")
|
|
if wp < 0 {
|
|
wp = 0
|
|
}
|
|
if strings.EqualFold(is[ip:], ws[wp:]) {
|
|
return true
|
|
}
|
|
}
|
|
u, e := i.URL()
|
|
uw, ew := with.URL()
|
|
if e != nil || ew != nil || !validURL(u) || !validURL(uw) {
|
|
return strings.EqualFold(i.String(), with.String())
|
|
}
|
|
if checkScheme {
|
|
if !strings.EqualFold(u.Scheme, uw.Scheme) {
|
|
return false
|
|
}
|
|
}
|
|
if !strings.EqualFold(u.Host, uw.Host) {
|
|
return false
|
|
}
|
|
if !(u.Path == "/" && uw.Path == "" || u.Path == "" && uw.Path == "/") &&
|
|
!strings.EqualFold(filepath.Clean(u.Path), filepath.Clean(uw.Path)) {
|
|
return false
|
|
}
|
|
uq := u.Query()
|
|
uwq := uw.Query()
|
|
if len(uq) != len(uwq) {
|
|
return false
|
|
}
|
|
for k, uqv := range uq {
|
|
uwqv, ok := uwq[k]
|
|
if !ok {
|
|
return false
|
|
}
|
|
if len(uqv) != len(uwqv) {
|
|
return false
|
|
}
|
|
for _, uqvv := range uqv {
|
|
eq := false
|
|
for _, uwqvv := range uwqv {
|
|
if uwqvv == uqvv {
|
|
eq = true
|
|
continue
|
|
}
|
|
}
|
|
if !eq {
|
|
return false
|
|
}
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func hostSplit(h string) (string, string) {
|
|
pieces := strings.Split(h, ":")
|
|
if len(pieces) == 0 {
|
|
return "", ""
|
|
}
|
|
if len(pieces) == 1 {
|
|
return pieces[0], ""
|
|
}
|
|
return pieces[0], pieces[1]
|
|
}
|
|
|
|
func (i IRI) Contains(what IRI, checkScheme bool) bool {
|
|
u, e := i.URL()
|
|
uw, ew := what.URL()
|
|
if e != nil || ew != nil {
|
|
return strings.Contains(i.String(), what.String())
|
|
}
|
|
if checkScheme {
|
|
if u.Scheme != uw.Scheme {
|
|
return false
|
|
}
|
|
}
|
|
uHost, _ := hostSplit(u.Host)
|
|
uwHost, _ := hostSplit(uw.Host)
|
|
if uHost != uwHost {
|
|
return false
|
|
}
|
|
p := u.Path
|
|
if p != "" {
|
|
p = filepath.Clean(p)
|
|
}
|
|
pw := uw.Path
|
|
if pw != "" {
|
|
pw = filepath.Clean(pw)
|
|
}
|
|
return strings.Contains(p, pw)
|
|
}
|
|
|
|
func (i IRI) ItemsMatch(col ...Item) bool {
|
|
for _, it := range col {
|
|
if match := it.GetLink().Contains(i, false); !match {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|