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#include "identity.h"
#include <algorithm>
#include <set>
#include <stdexcept>
using namespace erebos;
using std::async;
using std::nullopt;
using std::runtime_error;
using std::set;
optional<Identity> Identity::load(const Ref & ref)
{
return Identity::load(vector { ref });
}
optional<Identity> Identity::load(const vector<Ref> & refs)
{
vector<Stored<Signed<IdentityData>>> data;
data.reserve(refs.size());
for (const auto & ref : refs) {
auto d = Stored<Signed<IdentityData>>::load(ref);
if (!d)
return nullopt;
data.push_back(*d);
}
if (auto ptr = Priv::validate(data))
return Identity(ptr);
return nullopt;
}
optional<string> Identity::name() const
{
return p->name.get();
}
optional<Identity> Identity::owner() const
{
return p->owner;
}
optional<Ref> Identity::ref() const
{
if (p->data.size() == 1)
return p->data[0].ref;
return nullopt;
}
Identity::Builder Identity::create(const Storage & st)
{
return Builder (new Builder::Priv {
.storage = st,
.keyIdentity = SecretKey::generate(st).pub(),
.keyMessage = SecretKey::generate(st).pub(),
});
}
Identity::Builder Identity::modify() const
{
return Builder (new Builder::Priv {
.storage = p->data[0].ref.storage(),
.prev = p->data,
.keyIdentity = p->data[0]->data->keyIdentity,
.keyMessage = p->data[0]->data->keyMessage,
});
}
Identity Identity::Builder::commit() const
{
auto idata = p->storage.store(IdentityData {
.prev = p->prev,
.name = p->name,
.owner = p->owner && p->owner->p->data.size() == 1 ?
optional(p->owner->p->data[0]) : nullopt,
.keyIdentity = p->keyIdentity,
.keyMessage = p->keyMessage,
});
auto key = SecretKey::load(p->keyIdentity);
if (!key)
throw runtime_error("failed to load secret key");
auto sdata = key->sign(idata);
return Identity(Identity::Priv::validate({ sdata }));
}
void Identity::Builder::name(const string & val)
{
p->name = val;
}
void Identity::Builder::owner(const Identity & val)
{
p->owner.emplace(val);
}
optional<IdentityData> IdentityData::load(const Ref & ref)
{
auto rec = ref->asRecord();
if (!rec)
return nullopt;
vector<Stored<Signed<IdentityData>>> prev;
for (auto p : rec->items("SPREV"))
if (const auto & x = p.as<Signed<IdentityData>>())
prev.push_back(x.value());
auto keyIdentity = rec->item("key-id").as<PublicKey>();
if (!keyIdentity)
return nullopt;
return IdentityData {
.prev = std::move(prev),
.name = rec->item("name").asText(),
.owner = rec->item("owner").as<Signed<IdentityData>>(),
.keyIdentity = keyIdentity.value(),
.keyMessage = rec->item("key-msg").as<PublicKey>(),
};
}
Ref IdentityData::store(const Storage & st) const
{
vector<Record::Item> items;
for (const auto p : prev)
items.emplace_back("SPREV", p.ref);
if (name)
items.emplace_back("name", *name);
if (owner)
items.emplace_back("owner", owner->ref);
items.emplace_back("key-id", keyIdentity.ref);
if (keyMessage)
items.emplace_back("key-msg", keyMessage->ref);
return st.storeObject(Record(std::move(items)));
}
bool Identity::Priv::verifySignatures(const Stored<Signed<IdentityData>> & sdata)
{
if (!sdata->isSignedBy(sdata->data->keyIdentity))
return false;
for (const auto & p : sdata->data->prev)
if (!sdata->isSignedBy(p->data->keyIdentity))
return false;
if (sdata->data->owner &&
!sdata->isSignedBy(sdata->data->owner.value()->data->keyIdentity))
return false;
for (const auto & p : sdata->data->prev)
if (!verifySignatures(p))
return false;
return true;
}
shared_ptr<Identity::Priv> Identity::Priv::validate(const vector<Stored<Signed<IdentityData>>> & sdata)
{
for (const auto & d : sdata)
if (!verifySignatures(d))
return nullptr;
auto p = new Priv {
.data = sdata,
};
shared_ptr<Priv> ret(p);
auto ownerProp = p->lookupProperty([]
(const IdentityData & d) { return d.owner.has_value(); });
if (ownerProp) {
auto owner = validate({ *ownerProp.value()->owner });
if (!owner)
return nullptr;
p->owner.emplace(Identity(owner));
}
p->name = async(std::launch::deferred, [p] () -> optional<string> {
if (auto d = p->lookupProperty([] (const IdentityData & d) { return d.name.has_value(); }))
return d.value()->name;
return nullopt;
});
return ret;
}
optional<Stored<IdentityData>> Identity::Priv::lookupProperty(
function<bool(const IdentityData &)> sel) const
{
set<Stored<Signed<IdentityData>>> current, prop_heads;
for (const auto & d : data)
current.insert(d);
while (!current.empty()) {
Stored<Signed<IdentityData>> sdata =
current.extract(current.begin()).value();
if (sel(*sdata->data))
prop_heads.insert(sdata);
else
for (const auto & p : sdata->data->prev)
current.insert(p);
}
for (auto x = prop_heads.begin(); x != prop_heads.end(); x++)
for (auto y = std::next(x); y != prop_heads.end();)
if (y->precedes(*x))
y = prop_heads.erase(y);
else
y++;
if (prop_heads.begin() != prop_heads.end())
return (*prop_heads.begin())->data;
return nullopt;
}
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