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// SPDX-FileCopyrightText: 2022 Linus Jahn <lnj@kaidan.im>
// SPDX-FileCopyrightText: 2022 Jonah Brüchert <jbb@kaidan.im>
//
// SPDX-License-Identifier: LGPL-2.1-or-later
#include "QXmppEncryptedFileSource.h"
#include "QXmppConstants_p.h"
#include "QXmppHttpFileSource.h"
#include <optional>
#include <QDomElement>
#include <QXmlStreamWriter>
using namespace QXmpp;
/// \cond
class QXmppEncryptedFileSourcePrivate : public QSharedData
{
public:
Cipher cipher = Aes128GcmNoPad;
QByteArray key;
QByteArray iv;
QVector<QXmppHash> hashes;
QVector<QXmppHttpFileSource> httpSources;
};
QXMPP_PRIVATE_DEFINE_RULE_OF_SIX(QXmppEncryptedFileSource)
static QString cipherToString(Cipher cipher)
{
switch (cipher) {
case Aes128GcmNoPad:
return "urn:xmpp:ciphers:aes-128-gcm-nopadding:0";
case Aes256GcmNoPad:
return "urn:xmpp:ciphers:aes-256-gcm-nopadding:0";
case Aes256CbcPkcs7:
return "urn:xmpp:ciphers:aes-256-cbc-pkcs7:0";
}
Q_UNREACHABLE();
}
static std::optional<Cipher> cipherFromString(const QString &cipher)
{
if (cipher == "urn:xmpp:ciphers:aes-128-gcm-nopadding:0") {
return Aes128GcmNoPad;
} else if (cipher == "urn:xmpp:ciphers:aes-256-gcm-nopadding:0") {
return Aes256GcmNoPad;
} else if (cipher == "urn:xmpp:ciphers:aes-256-cbc-pkcs7:0") {
return Aes256CbcPkcs7;
}
return {};
}
/// \endcond
///
/// \class QXmppEncryptedFileSource
///
/// \brief Represents an encrypted file source for file sharing.
///
/// \since QXmpp 1.5
///
QXmppEncryptedFileSource::QXmppEncryptedFileSource()
: d(new QXmppEncryptedFileSourcePrivate())
{
}
/// Returns the cipher that was used to encrypt the data in this file source
Cipher QXmppEncryptedFileSource::cipher() const
{
return d->cipher;
}
/// Sets the cipher that was used to encrypt the data in this file source
void QXmppEncryptedFileSource::setCipher(Cipher newCipher)
{
d->cipher = newCipher;
}
/// Returns the key that can be used to decrypt the data in this file source
const QByteArray &QXmppEncryptedFileSource::key() const
{
return d->key;
}
/// Sets the key that was used to encrypt the data in this file source
void QXmppEncryptedFileSource::setKey(const QByteArray &newKey)
{
d->key = newKey;
}
/// Returns the Initialization vector that can be used to decrypt the data in this file source
const QByteArray &QXmppEncryptedFileSource::iv() const
{
return d->iv;
}
/// Sets the initialization vector that was used to encrypt the data in this file source
void QXmppEncryptedFileSource::setIv(const QByteArray &newIv)
{
d->iv = newIv;
}
/// Returns the hashes of the file contained in this file source
const QVector<QXmppHash> &QXmppEncryptedFileSource::hashes() const
{
return d->hashes;
}
/// Sets the hashes of the file contained in this file source
void QXmppEncryptedFileSource::setHashes(const QVector<QXmppHash> &newHashes)
{
d->hashes = newHashes;
}
/// Returns the http sources that can be used to retrieve the encrypted data
const QVector<QXmppHttpFileSource> &QXmppEncryptedFileSource::httpSources() const
{
return d->httpSources;
}
/// Sets the http sources containing the encrypted data
void QXmppEncryptedFileSource::setHttpSources(const QVector<QXmppHttpFileSource> &newHttpSources)
{
d->httpSources = newHttpSources;
}
/// \cond
bool QXmppEncryptedFileSource::parse(const QDomElement &el)
{
QString cipher = el.attribute(QStringLiteral("cipher"));
if (auto parsedCipher = cipherFromString(cipher)) {
d->cipher = *parsedCipher;
} else {
return false;
}
auto keyEl = el.firstChildElement(QStringLiteral("key"));
if (keyEl.isNull()) {
return false;
}
d->key = QByteArray::fromBase64(keyEl.text().toUtf8());
auto ivEl = el.firstChildElement(QStringLiteral("iv"));
if (ivEl.isNull()) {
return false;
}
d->iv = QByteArray::fromBase64(ivEl.text().toUtf8());
for (auto childEl = el.firstChildElement(QStringLiteral("hash"));
!childEl.isNull();
childEl = childEl.nextSiblingElement(QStringLiteral("hash"))) {
QXmppHash hash;
if (!hash.parse(childEl)) {
return false;
}
d->hashes.push_back(std::move(hash));
}
auto sourcesEl = el.firstChildElement(QStringLiteral("sources"));
if (sourcesEl.isNull()) {
return false;
}
for (auto childEl = sourcesEl.firstChildElement(QStringLiteral("url-data"));
!childEl.isNull();
childEl = childEl.nextSiblingElement(QStringLiteral("url-data"))) {
QXmppHttpFileSource source;
source.parse(childEl);
d->httpSources.push_back(std::move(source));
}
return true;
}
void QXmppEncryptedFileSource::toXml(QXmlStreamWriter *writer) const
{
writer->writeStartElement(QStringLiteral("encrypted"));
writer->writeDefaultNamespace(ns_esfs);
writer->writeAttribute(QStringLiteral("cipher"), cipherToString(d->cipher));
writer->writeTextElement(QStringLiteral("key"), d->key.toBase64());
writer->writeTextElement(QStringLiteral("iv"), d->iv.toBase64());
for (const auto &hash : d->hashes) {
hash.toXml(writer);
}
writer->writeStartElement(QStringLiteral("sources"));
writer->writeDefaultNamespace(ns_sfs);
for (const auto &source : d->httpSources) {
source.toXml(writer);
}
writer->writeEndElement();
writer->writeEndElement();
}
/// \endcond
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