From a16b33031c7bcf2eabf1e0c3571000234b7740df Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Roman=20Smr=C5=BE?= <roman.smrz@seznam.cz>
Date: Sun, 24 Jan 2021 22:46:48 +0100
Subject: Attach service

---
 src/attach.cpp | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 src/attach.cpp

(limited to 'src/attach.cpp')

diff --git a/src/attach.cpp b/src/attach.cpp
new file mode 100644
index 0000000..2bc2b74
--- /dev/null
+++ b/src/attach.cpp
@@ -0,0 +1,124 @@
+#include <erebos/attach.h>
+
+#include "identity.h"
+#include "pubkey.h"
+
+#include <erebos/network.h>
+
+#include <stdexcept>
+
+using namespace erebos;
+using std::lock_guard;
+using std::nullopt;
+using std::runtime_error;
+
+static const UUID myUUID("4995a5f9-2d4d-48e9-ad3b-0bf1c2a1be7f");
+
+AttachService::AttachService() = default;
+AttachService::~AttachService() = default;
+
+UUID AttachService::uuid() const
+{
+	return myUUID;
+}
+
+void AttachService::attachTo(const Peer & peer)
+{
+	requestPairing(myUUID, peer);
+}
+
+Stored<AttachIdentity> AttachService::handlePairingComplete(const Peer & peer)
+{
+	auto owner = peer.server().identity().finalOwner();
+	auto id = peer.identity()->ref();
+	auto prev = Stored<Signed<IdentityData>>::load(*peer.identity()->ref());
+
+	auto idata = peer.tempStorage().store(IdentityData {
+		.prev = { prev },
+		.name = nullopt,
+		.owner = Stored<Signed<IdentityData>>::load(*owner.ref()),
+		.keyIdentity = prev->data->keyIdentity,
+		.keyMessage = nullopt,
+	});
+
+	auto key = SecretKey::load(owner.keyIdentity());
+	if (!key)
+		throw runtime_error("failed to load secret key");
+
+	auto mkey = SecretKey::load(owner.keyMessage());
+	if (!mkey)
+		throw runtime_error("failed to load secret key");
+
+	auto sdata = key->sign(idata);
+
+	return peer.tempStorage().store(AttachIdentity {
+		.identity = sdata,
+		.keys = { key->getData(), mkey->getData() },
+	});
+}
+
+void AttachService::handlePairingResult(Context & ctx, Stored<AttachIdentity> att)
+{
+	if (att->identity->data->prev.size() != 1 ||
+			att->identity->data->prev[0].ref().digest() !=
+			ctx.local()->identity()->ref()->digest())
+		return;
+
+	if (att->identity->data->keyIdentity.ref().digest() !=
+			ctx.local()->identity()->keyIdentity().ref().digest())
+		return;
+
+	auto key = SecretKey::load(ctx.peer().server().identity().keyIdentity());
+	if (!key)
+		throw runtime_error("failed to load secret key");
+
+	auto id = Identity::load(key->signAdd(att->identity).ref());
+	if (!id)
+		printf("New identity validation failed\n");
+
+	auto rid = ctx.local().ref().storage().copy(*id->ref());
+	id = Identity::load(rid);
+
+	auto owner = id->owner();
+	if (!owner)
+		printf("New identity without owner\n");
+
+	// Store the keys
+	for (const auto & k : att->keys) {
+		SecretKey::fromData(owner->keyIdentity(), k);
+		SecretKey::fromData(owner->keyMessage(), k);
+	}
+
+	ctx.local(ctx.local()->identity(*id));
+}
+
+AttachIdentity AttachIdentity::load(const Ref & ref)
+{
+	auto rec = ref->asRecord();
+	if (!rec)
+		return AttachIdentity {
+			.identity = Stored<Signed<IdentityData>>::load(ref.storage().zref()),
+			.keys = {},
+		};
+
+	vector<vector<uint8_t>> keys;
+	for (auto s : rec->items("skey"))
+		if (const auto & b = s.asBinary())
+			keys.push_back(*b);
+
+	return AttachIdentity {
+		.identity = *rec->item("identity").as<Signed<IdentityData>>(),
+		.keys = keys,
+	};
+}
+
+Ref AttachIdentity::store(const Storage & st) const
+{
+	vector<Record::Item> items;
+
+	items.emplace_back("identity", identity.ref());
+	for (const auto & key : keys)
+		items.emplace_back("skey", key);
+
+	return st.storeObject(Record(std::move(items)));
+}
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