From 37d76d8f266f40801f4f7c3eaff3adaebb81ef31 Mon Sep 17 00:00:00 2001
From: Julio Capote <jcapote@gmail.com>
Date: Wed, 4 Jan 2023 22:59:56 -0500
Subject: try signing and sending accept

---
 registry/registry.go | 57 ++++++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 53 insertions(+), 4 deletions(-)

diff --git a/registry/registry.go b/registry/registry.go
index 1c8c9b3..5376f80 100644
--- a/registry/registry.go
+++ b/registry/registry.go
@@ -7,9 +7,12 @@ import (
 	"encoding/gob"
 	"encoding/json"
 	"encoding/pem"
+	"fmt"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
+	"sync"
 
 	"git.capotej.com/capotej/communique/config"
 	"git.capotej.com/capotej/communique/models"
@@ -18,6 +21,7 @@ import (
 	"git.capotej.com/capotej/communique/views"
 	"github.com/go-fed/activity/streams"
 	"github.com/go-fed/activity/streams/vocab"
+	"github.com/go-fed/httpsig"
 	"go.uber.org/zap"
 )
 
@@ -31,6 +35,8 @@ type Registry struct {
 	persister  *models.Persister
 	handlerMap map[string]Handler
 	log        *zap.SugaredLogger
+	signer     httpsig.Signer
+	mu         *sync.Mutex
 }
 
 func NewRegistry(cfg config.Config, persister *models.Persister, log *zap.SugaredLogger) (*Registry, error) {
@@ -198,7 +204,7 @@ func (r *Registry) Inbox(name string, req *http.Request, payload []byte) error {
 		url := inboxProp.GetIRI()
 		logger.With("actor", idPropUrl).With("inbox", url).Debugf("follow")
 
-		deliverAcceptToInbox(url, actorUrl, follow, handler.handlerCfg, r.log)
+		r.deliverAcceptToInbox(url, actorUrl, follow, handler.handlerCfg)
 		// subscribeActorToHandler()
 		return nil
 	}, func(c context.Context, note vocab.ActivityStreamsUndo) error {
@@ -215,7 +221,7 @@ func (r *Registry) Inbox(name string, req *http.Request, payload []byte) error {
 	return err
 }
 
-func deliverAcceptToInbox(url, actorUrl *url.URL, follow vocab.ActivityStreamsFollow, handler config.Handler, log *zap.SugaredLogger) error {
+func (r *Registry) deliverAcceptToInbox(url, actorUrl *url.URL, follow vocab.ActivityStreamsFollow, handler config.Handler) error {
 	accept := streams.NewActivityStreamsAccept()
 	actorProp := streams.NewActivityStreamsActorProperty()
 	actorProp.AppendIRI(actorUrl)
@@ -227,8 +233,51 @@ func deliverAcceptToInbox(url, actorUrl *url.URL, follow vocab.ActivityStreamsFo
 	if err != nil {
 		return err
 	}
-	log.With("type", "delivery").With("payload", payload).Debugf("sending accept")
-	return nil
+	jsonData, err := json.Marshal(payload)
+
+	aso := models.NewKeypair(handler)
+	result, err := r.persister.Find(aso)
+	if err != nil {
+		return err
+	}
+	buf := bytes.NewBuffer(result)
+	dec := gob.NewDecoder(buf)
+	var keypair models.Keypair
+	err = dec.Decode(&keypair)
+	if err != nil {
+		return err
+	}
+	privKey := &keypair.PrivateKey
+
+	request, err := http.NewRequest("POST", url.String(), bytes.NewBuffer(jsonData))
+
+	r.log.With("type", "delivery").With("payload", payload).Debugf("signing")
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	prefs := []httpsig.Algorithm{httpsig.RSA_SHA512, 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, "date", "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"
+	// body := nil
+	// If r were a http.ResponseWriter, call SignResponse instead.
+	err = signer.SignRequest(privKey, actorUrl.String(), request, jsonData)
+
+	r.log.With("type", "delivery").With("payload", payload).Debugf("sending accept")
+	client := &http.Client{}
+	response, err := client.Do(request)
+	if err != nil {
+		return fmt.Errorf("could not send accept request: %w", err)
+	}
+	responseBody, err := io.ReadAll(response.Body)
+	defer response.Body.Close()
+	r.log.With("type", "delivery").With("response", responseBody).Debugf("received")
+	return err
 }
 
 func (r *Registry) ActivityOrNote(activityOrNote, name, id string) (map[string]interface{}, error) {
-- 
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