owl-blogs/app/activity_pub_service.go

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package app
import (
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"bytes"
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"crypto/rand"
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"crypto/rsa"
"crypto/x509"
"encoding/pem"
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"errors"
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"io"
"log/slog"
"net/http"
"net/url"
"owl-blogs/app/repository"
"owl-blogs/config"
"owl-blogs/domain/model"
"owl-blogs/render"
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"reflect"
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"time"
vocab "github.com/go-ap/activitypub"
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"github.com/go-ap/jsonld"
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"github.com/go-fed/httpsig"
)
type ActivityPubConfig struct {
PreferredUsername string
PublicKeyPem string
PrivateKeyPem string
}
// Form implements app.AppConfig.
func (cfg *ActivityPubConfig) Form(binSvc model.BinaryStorageInterface) string {
f, _ := render.RenderTemplateToString("forms/ActivityPubConfig", cfg)
return f
}
// ParseFormData implements app.AppConfig.
func (cfg *ActivityPubConfig) ParseFormData(data model.HttpFormData, binSvc model.BinaryStorageInterface) error {
cfg.PreferredUsername = data.FormValue("PreferredUsername")
cfg.PublicKeyPem = data.FormValue("PublicKeyPem")
cfg.PrivateKeyPem = data.FormValue("PrivateKeyPem")
return nil
}
func (cfg *ActivityPubConfig) PrivateKey() *rsa.PrivateKey {
block, _ := pem.Decode([]byte(cfg.PrivateKeyPem))
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privKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
slog.Error("error x509.ParsePKCS1PrivateKey", "err", err)
}
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return privKey
}
type ActivityPubService struct {
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followersRepo repository.FollowerRepository
configRepo repository.ConfigRepository
siteConfigServcie *SiteConfigService
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}
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func NewActivityPubService(
followersRepo repository.FollowerRepository,
configRepo repository.ConfigRepository,
siteConfigServcie *SiteConfigService,
) *ActivityPubService {
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return &ActivityPubService{
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followersRepo: followersRepo,
configRepo: configRepo,
siteConfigServcie: siteConfigServcie,
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}
}
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func (svc *ActivityPubService) defaultConfig() ActivityPubConfig {
privKey, _ := rsa.GenerateKey(rand.Reader, 2048)
pubKey := privKey.Public().(*rsa.PublicKey)
pubKeyPem := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PUBLIC KEY",
Bytes: x509.MarshalPKCS1PublicKey(pubKey),
},
)
privKeyPrm := pem.EncodeToMemory(
&pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(privKey),
},
)
return ActivityPubConfig{
PreferredUsername: "blog",
PublicKeyPem: string(pubKeyPem),
PrivateKeyPem: string(privKeyPrm),
}
}
func (svc *ActivityPubService) GetApConfig() (ActivityPubConfig, error) {
apConfig := ActivityPubConfig{}
err := svc.configRepo.Get(config.ACT_PUB_CONF_NAME, &apConfig)
if err != nil {
println("ERROR IN ACTIVITY PUB CONFIG")
return ActivityPubConfig{}, err
}
if reflect.ValueOf(apConfig).IsZero() {
cfg := svc.defaultConfig()
svc.configRepo.Update(config.ACT_PUB_CONF_NAME, cfg)
return cfg, nil
}
return apConfig, nil
}
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func (svc *ActivityPubService) ActorUrl() string {
cfg, _ := svc.siteConfigServcie.GetSiteConfig()
return cfg.FullUrl
}
func (svc *ActivityPubService) MainKeyUri() string {
cfg, _ := svc.siteConfigServcie.GetSiteConfig()
return cfg.FullUrl + "#main-key"
}
func (svc *ActivityPubService) InboxUrl() string {
cfg, _ := svc.siteConfigServcie.GetSiteConfig()
return cfg.FullUrl + "/activitypub/inbox"
}
func (svc *ActivityPubService) OutboxUrl() string {
cfg, _ := svc.siteConfigServcie.GetSiteConfig()
return cfg.FullUrl + "/activitypub/outbox"
}
func (svc *ActivityPubService) FollowersUrl() string {
cfg, _ := svc.siteConfigServcie.GetSiteConfig()
return cfg.FullUrl + "/activitypub/followers"
}
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func (s *ActivityPubService) AddFollower(follower string) error {
return s.followersRepo.Add(follower)
}
func (s *ActivityPubService) RemoveFollower(follower string) error {
return s.followersRepo.Remove(follower)
}
func (s *ActivityPubService) AllFollowers() ([]string, error) {
return s.followersRepo.All()
}
func (s *ActivityPubService) sign(privateKey *rsa.PrivateKey, pubKeyId string, body []byte, r *http.Request) error {
prefs := []httpsig.Algorithm{httpsig.RSA_SHA256}
digestAlgorithm := httpsig.DigestSha256
// The "Date" and "Digest" headers must already be set on r, as well as r.URL.
headersToSign := []string{httpsig.RequestTarget, "host", "date"}
if body != nil {
headersToSign = append(headersToSign, "digest")
}
signer, _, err := httpsig.NewSigner(prefs, digestAlgorithm, headersToSign, httpsig.Signature, 0)
if err != nil {
return err
}
// To sign the digest, we need to give the signer a copy of the body...
// ...but it is optional, no digest will be signed if given "nil"
// If r were a http.ResponseWriter, call SignResponse instead.
err = signer.SignRequest(privateKey, pubKeyId, r, body)
slog.Info("Signed Request", "req", r.Header)
return err
}
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func (s *ActivityPubService) GetActor(reqUrl string) (vocab.Actor, error) {
siteConfig := model.SiteConfig{}
apConfig := ActivityPubConfig{}
s.configRepo.Get(config.ACT_PUB_CONF_NAME, &apConfig)
s.configRepo.Get(config.SITE_CONFIG, &siteConfig)
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c := http.Client{}
parsedUrl, err := url.Parse(reqUrl)
if err != nil {
slog.Error("parse error", "err", err)
return vocab.Actor{}, err
}
req, _ := http.NewRequest("GET", reqUrl, nil)
req.Header.Set("Accept", "application/ld+json")
req.Header.Set("Date", time.Now().Format(http.TimeFormat))
req.Header.Set("Host", parsedUrl.Host)
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err = s.sign(apConfig.PrivateKey(), s.MainKeyUri(), nil, req)
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if err != nil {
slog.Error("Signing error", "err", err)
return vocab.Actor{}, err
}
resp, err := c.Do(req)
if err != nil {
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slog.Error("failed to retrieve sender actor", "err", err, "url", reqUrl)
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return vocab.Actor{}, err
}
data, err := io.ReadAll(resp.Body)
if err != nil {
return vocab.Actor{}, err
}
item, err := vocab.UnmarshalJSON(data)
if err != nil {
return vocab.Actor{}, err
}
var actor vocab.Actor
err = vocab.OnActor(item, func(o *vocab.Actor) error {
actor = *o
return nil
})
return actor, err
}
func (s *ActivityPubService) VerifySignature(r *http.Request, sender string) error {
siteConfig := model.SiteConfig{}
apConfig := ActivityPubConfig{}
s.configRepo.Get(config.ACT_PUB_CONF_NAME, &apConfig)
s.configRepo.Get(config.SITE_CONFIG, &siteConfig)
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slog.Info("verifying for", "sender", sender, "retriever", s.ActorUrl())
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actor, err := s.GetActor(sender)
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// actor does not have a pub key -> don't verify
if actor.PublicKey.PublicKeyPem == "" {
return nil
}
if err != nil {
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slog.Error("unable to retrieve actor for sig verification", "sender", sender)
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return err
}
block, _ := pem.Decode([]byte(actor.PublicKey.PublicKeyPem))
pubKey, err := x509.ParsePKIXPublicKey(block.Bytes)
if err != nil {
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slog.Error("unable to decode pub key pem", "pubKeyPem", actor.PublicKey.PublicKeyPem)
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return err
}
slog.Info("retrieved pub key of sender", "actor", actor, "pubKey", pubKey)
verifier, err := httpsig.NewVerifier(r)
if err != nil {
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slog.Error("invalid signature", "err", err)
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return err
}
return verifier.Verify(pubKey, httpsig.RSA_SHA256)
}
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func (s *ActivityPubService) Accept(act *vocab.Activity) error {
actor, err := s.GetActor(act.Actor.GetID().String())
if err != nil {
return err
}
accept := vocab.AcceptNew(vocab.IRI("TODO"), act)
data, err := jsonld.WithContext(
jsonld.IRI(vocab.ActivityBaseURI),
).Marshal(accept)
if err != nil {
slog.Error("marshalling error", "err", err)
return err
}
return s.sendObject(actor, data)
}
func (s *ActivityPubService) sendObject(to vocab.Actor, data []byte) error {
siteConfig := model.SiteConfig{}
apConfig := ActivityPubConfig{}
s.configRepo.Get(config.ACT_PUB_CONF_NAME, &apConfig)
s.configRepo.Get(config.SITE_CONFIG, &siteConfig)
if to.Inbox == nil {
slog.Error("actor has no inbox", "actor", to)
return errors.New("actor has no inbox")
}
actorUrl, err := url.Parse(to.Inbox.GetID().String())
if err != nil {
slog.Error("parse error", "err", err)
return err
}
c := http.Client{}
req, _ := http.NewRequest("POST", to.Inbox.GetID().String(), bytes.NewReader(data))
req.Header.Set("Accept", "application/ld+json")
req.Header.Set("Date", time.Now().Format(http.TimeFormat))
req.Header.Set("Host", actorUrl.Host)
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err = s.sign(apConfig.PrivateKey(), s.MainKeyUri(), data, req)
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if err != nil {
slog.Error("Signing error", "err", err)
return err
}
resp, err := c.Do(req)
if err != nil {
slog.Error("Sending error", "url", req.URL, "err", err)
return err
}
slog.Info("Request", "host", resp.Request.Header)
if resp.StatusCode > 299 {
body, _ := io.ReadAll(resp.Body)
slog.Error("Error sending Note", "method", resp.Request.Method, "url", resp.Request.URL, "status", resp.Status, "body", string(body))
return err
}
body, _ := io.ReadAll(resp.Body)
slog.Info("Sent Body", "body", string(data))
slog.Info("Retrieved", "status", resp.Status, "body", string(body))
return nil
}