From 032ce43dd55ea095a48020fcd53b5633daa56f31 Mon Sep 17 00:00:00 2001
From: Julio Capote <jcapote@gmail.com>
Date: Tue, 3 Jan 2023 22:15:13 -0500
Subject: start of remote public key fetching

---
 main.go              |  2 +-
 registry/registry.go | 44 +++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 40 insertions(+), 6 deletions(-)

diff --git a/main.go b/main.go
index 453a4e3..e5f530a 100644
--- a/main.go
+++ b/main.go
@@ -51,7 +51,7 @@ func main() {
 	persister := models.NewPersister(log, db)
 
 	// Registry
-	registry, err := registry.NewRegistry(cfg, persister)
+	registry, err := registry.NewRegistry(cfg, persister, log)
 	if err != nil {
 		log.Fatal(err)
 	}
diff --git a/registry/registry.go b/registry/registry.go
index dc83328..50986c9 100644
--- a/registry/registry.go
+++ b/registry/registry.go
@@ -2,9 +2,12 @@ package registry
 
 import (
 	"bytes"
+	"context"
 	"crypto/x509"
 	"encoding/gob"
+	"encoding/json"
 	"encoding/pem"
+	"io"
 	"net/http"
 	"net/url"
 	"strings"
@@ -13,6 +16,10 @@ import (
 	"git.capotej.com/capotej/communique/models"
 	"git.capotej.com/capotej/communique/urls"
 	"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"
 )
 
 type Handler struct {
@@ -24,9 +31,10 @@ type Registry struct {
 	cfg        config.Config
 	persister  *models.Persister
 	handlerMap map[string]Handler
+	log        *zap.SugaredLogger
 }
 
-func NewRegistry(cfg config.Config, persister *models.Persister) (*Registry, error) {
+func NewRegistry(cfg config.Config, persister *models.Persister, log *zap.SugaredLogger) (*Registry, error) {
 	reg := Registry{cfg: cfg, persister: persister}
 	reg.handlerMap = make(map[string]Handler)
 	for _, v := range cfg.Handlers {
@@ -153,10 +161,36 @@ func (r *Registry) Inbox(name string, req *http.Request) error {
 	if handler == nil {
 		return nil
 	}
-	// verifier, err := httpsig.NewVerifier(req)
-	// if err != nil {
-	// 	return err
-	// }
+	logger := r.log.With("type", "inbox")
+
+	verifier, err := httpsig.NewVerifier(req)
+	if err != nil {
+		return err
+	}
+
+	keyId := verifier.KeyId()
+	logger.With("keyId", keyId).Debugf("fetching")
+	resp, err := http.Get(keyId)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+	keyPage, err := io.ReadAll(resp.Body)
+	logger.With("keyId", keyId).With("response", string(keyPage)).Debugf("received response")
+	var keyPageData map[string]interface{}
+	err = json.Unmarshal(keyPage, &keyPageData)
+	if err != nil {
+		return err
+	}
+	var t vocab.ActivityStreamsPerson
+	streams.ToType(context.Background(), keyPageData)
+	pubKeyProp := t.GetW3IDSecurityV1PublicKey()
+	iter := pubKeyProp.At(0)
+	pubKey := iter.Get()
+	pemProp := pubKey.GetW3IDSecurityV1PublicKeyPem()
+	pem := pemProp.Get()
+	logger.With("keyId", keyId).With("pem", pem).Debugf("extracted pem")
+
 	return nil
 }
 
-- 
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