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encrypted-file.cpp
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encrypted-file.cpp
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/*
* This file is part of libkazv.
* SPDX-FileCopyrightText: 2021 Tusooa Zhu <tusooa@kazv.moe>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include "encrypted-file.hpp"
namespace Kazv
{
struct EncryptedFileDesc::Private
{
std::string mxcUri;
std::string key;
std::string iv;
std::string sha256Hash;
};
EncryptedFileDesc::EncryptedFileDesc()
: m_d(std::make_unique<Private>())
{
}
EncryptedFileDesc::EncryptedFileDesc(std::string mxcUri, std::string key, std::string iv, std::string sha256Hash)
: m_d(std::make_unique<Private>(Private{mxcUri, key, iv, sha256Hash}))
{
}
KAZV_DEFINE_COPYABLE_UNIQUE_PTR(EncryptedFileDesc, m_d)
EncryptedFileDesc::~EncryptedFileDesc() = default;
EncryptedFileDesc EncryptedFileDesc::fromJson(JsonWrap encryptedFile)
{
try {
// First, verify EncryptedFile object
auto jwk = encryptedFile.get().at("key");
auto keyOps = jwk.at("key_ops");
if (! (encryptedFile.get().at("v").template get<std::string>() == "v2"
&& jwk.at("kty").template get<std::string>() == "oct"
&& jwk.at("alg").template get<std::string>() == "A256CTR"
&& jwk.at("ext").template get<bool>() == true
&& std::find(keyOps.cbegin(), keyOps.cend(), "encrypt") != keyOps.cend()
&& std::find(keyOps.cbegin(), keyOps.cend(), "decrypt") != keyOps.cend())) {
// invalid EncryptedFile object
return EncryptedFileDesc();
}
auto mxcUri = encryptedFile.get().at("url").template get<std::string>();
auto key = encryptedFile.get().at("key").at("k").template get<std::string>();
auto iv = encryptedFile.get().at("iv").template get<std::string>();
auto sha256Hash = encryptedFile.get().at("hashes").at("sha256").template get<std::string>();
return EncryptedFileDesc(mxcUri, key, iv, sha256Hash);
} catch (const std::exception &) {
return EncryptedFileDesc();
}
}
JsonWrap EncryptedFileDesc::toJson() const
{
return json::object({
{"url", mxcUri()},
{"key", json::object({
{"kty", "oct"},
{"key_ops", json::array({"encrypt", "decrypt"})},
{"alg", "A256CTR"},
{"k", key()},
{"ext", true},
})},
{"iv", iv()},
{"hashes", json::object({
{"sha256", sha256Hash()}
})},
{"v", "v2"},
});
}
std::string EncryptedFileDesc::mxcUri() const
{
if (! m_d) { return ""; }
return m_d->mxcUri;
}
std::string EncryptedFileDesc::key() const
{
if (! m_d) { return ""; }
return m_d->key;
}
std::string EncryptedFileDesc::iv() const
{
if (! m_d) { return ""; }
return m_d->iv;
}
std::string EncryptedFileDesc::sha256Hash() const
{
if (! m_d) { return ""; }
return m_d->sha256Hash;
}
bool EncryptedFileDesc::operator==(const EncryptedFileDesc &that) const
{
return (m_d == that.m_d
|| (mxcUri() == that.mxcUri()
&& key() == that.key()
&& iv() == that.iv()
&& sha256Hash() == that.sha256Hash()));
}
}

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encrypted-file.cpp (3 KB)

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