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/*
WhatsApp plugin for Miranda NG
Copyright © 2019-22 George Hazan
*/
#include "stdafx.h"
//////////////////////////////////////////////////////////////////////////////
void WhatsAppProto::InitSync()
{
m_arCollections.insert(new WACollection("regular"));
m_arCollections.insert(new WACollection("regular_high"));
m_arCollections.insert(new WACollection("regular_low"));
m_arCollections.insert(new WACollection("critical_block"));
m_arCollections.insert(new WACollection("critical_unblock_low"));
for (auto &it : m_arCollections) {
CMStringW wszPath(GetTmpFileName("collection", it->szName));
wszPath.Append(L".json");
if (_waccess(wszPath, 0))
continue;
JSONNode root = JSONNode::parse(file2string(wszPath));
it->version = root["version"].as_int();
auto szHash = decodeBinStr(root["hash"].as_string());
if (szHash.size() == sizeof(it->hash.hash))
memcpy(it->hash.hash, szHash.c_str(), sizeof(it->hash.hash));
for (auto &val : root["indexValueMap"])
it->indexValueMap[decodeBinStr(val.name())] = decodeBinStr(val.as_string());
}
}
/////////////////////////////////////////////////////////////////////////////////////////
void WhatsAppProto::OnServerSync(const WANode &node)
{
OBJLIST<WACollection> task(1);
for (auto &it : node.getChildren())
if (it->title == "collection")
task.insert(new WACollection(it->getAttr("name"), it->getAttrInt("version")));
ResyncServer(task);
SendAck(node);
}
void WhatsAppProto::ResyncAll()
{
ResyncServer(m_arCollections);
}
void WhatsAppProto::ResyncServer(const OBJLIST<WACollection> &task)
{
WANodeIq iq(IQ::SET, "w:sync:app:state");
auto *pList = iq.addChild("sync");
for (auto &it : task) {
auto *pCollection = m_arCollections.find(it);
if (pCollection == nullptr)
m_arCollections.insert(pCollection = new WACollection(it->szName, 0));
if (!pCollection->version || pCollection->version < it->version) {
auto *pNode = pList->addChild("collection");
*pNode << CHAR_PARAM("name", it->szName) << INT_PARAM("version", pCollection->version)
<< CHAR_PARAM("return_snapshot", (!pCollection->version) ? "true" : "false");
}
}
if (pList->getFirstChild() != nullptr)
WSSendNode(iq, &WhatsAppProto::OnIqServerSync);
}
void WhatsAppProto::OnIqServerSync(const WANode &node)
{
for (auto &coll : node.getChild("sync")->getChildren()) {
if (coll->title != "collection")
continue;
auto *pszName = coll->getAttr("name");
auto *pCollection = FindCollection(pszName);
if (pCollection == nullptr) {
pCollection = new WACollection(pszName, 0);
m_arCollections.insert(pCollection);
}
int dwVersion = 0;
CMStringW wszSnapshotPath(GetTmpFileName("collection", pszName));
if (auto *pSnapshot = coll->getChild("snapshot")) {
proto::ExternalBlobReference body(pSnapshot->content);
if (!body->directpath || !body->has_mediakey) {
debugLogA("Invalid snapshot data, skipping");
continue;
}
MBinBuffer buf = DownloadEncryptedFile(directPath2url(body->directpath), body->mediakey, "App State");
if (!buf.data()) {
debugLogA("Invalid downloaded snapshot data, skipping");
continue;
}
proto::SyncdSnapshot snapshot(buf);
dwVersion = snapshot->version->version;
if (dwVersion > pCollection->version) {
pCollection->hash.init();
debugLogA("%s: applying snapshot of version %d", pCollection->szName.get(), dwVersion);
for (int i=0; i < snapshot->n_records; i++)
ParsePatch(pCollection, snapshot->records[i], true);
}
else debugLogA("%s: skipping snapshot of version %d", pCollection->szName.get(), dwVersion);
}
if (auto *pPatchList = coll->getChild("patches")) {
for (auto &it : pPatchList->getChildren()) {
proto::SyncdPatch patch(it->content);
dwVersion = patch->version->version;
if (dwVersion > pCollection->version) {
debugLogA("%s: applying patch of version %d", pCollection->szName.get(), dwVersion);
for (int i = 0; i < patch->n_mutations; i++) {
auto &jt = *patch->mutations[i];
ParsePatch(pCollection, jt.record, jt.operation == WA__SYNCD_MUTATION__SYNCD_OPERATION__SET);
}
}
else debugLogA("%s: skipping patch of version %d", pCollection->szName.get(), dwVersion);
}
}
CMStringA szSetting(FORMAT, "Collection_%s", pszName);
// setDword(szSetting, dwVersion);
JSONNode jsonRoot, jsonMap;
for (auto &it : pCollection->indexValueMap)
jsonMap << CHAR_PARAM(ptrA(mir_base64_encode(it.first.c_str(), it.first.size())), ptrA(mir_base64_encode(it.second.c_str(), it.second.size())));
jsonRoot << INT_PARAM("version", dwVersion) << CHAR_PARAM("hash", ptrA(mir_base64_encode(pCollection->hash.hash, sizeof(pCollection->hash.hash))))
<< JSON_PARAM("indexValueMap", jsonMap);
string2file(jsonRoot.write(), GetTmpFileName("collection", CMStringA(pszName) + ".json"));
}
}
static uint8_t sttMutationInfo[] = "WhatsApp Mutation Keys";
void WhatsAppProto::ParsePatch(WACollection *pColl, const Wa__SyncdRecord *rec, bool bSet)
{
int id = decodeBigEndian(rec->keyid->id);
auto &indexBlob = rec->index->blob;
auto &value = rec->value->blob;
auto *macValue = value.data + value.len - 32;
std::string index((char *)indexBlob.data, indexBlob.len);
MBinBuffer key(getBlob(CMStringA(FORMAT, "AppSyncKey%d", id)));
if (!key.data()) {
debugLogA("No key with id=%d to decode a patch");
return;
}
struct
{
uint8_t indexKey[32];
uint8_t encKey[32];
uint8_t macKey[32];
uint8_t snapshotMacKey[32];
uint8_t patchMacKey[32];
} mutationKeys;
HKDF(EVP_sha256(), (BYTE *)"", 0, key.data(), key.length(), sttMutationInfo, sizeof(sttMutationInfo) - 1, (BYTE *)&mutationKeys, sizeof(mutationKeys));
MBinBuffer decoded = aesDecrypt(EVP_aes_256_cbc(), mutationKeys.encKey, value.data, value.data + 16, value.len - 32);
if (!decoded.data()) {
debugLogA("Unable to decode patch with key id=%d", id);
return;
}
proto::SyncActionData data(decoded);
// debugLogA("Applying patch for %s{%d}: %s", pColl->szName.get(), data.version, data.Utf8DebugString().c_str());
if (bSet) {
JSONNode jsonRoot = JSONNode::parse((char*)data->index.data);
ApplyPatch(jsonRoot, data->value);
pColl->hash.add(macValue, 32);
pColl->indexValueMap[index] = std::string((char*)macValue, 32);
}
else {
auto &prevVal = pColl->indexValueMap.find(index);
if (prevVal != pColl->indexValueMap.end()) {
pColl->hash.sub(prevVal->second.c_str(), prevVal->second.size());
pColl->indexValueMap.erase(prevVal);
}
}
}
void WhatsAppProto::ApplyPatch(const JSONNode &index, const Wa__SyncActionValue *data)
{
auto title = index.at((json_index_t)0).as_string();
if (title == "contact" && data->contactaction) {
WAJid jid(index.at(1).as_string().c_str());
auto *pUser = AddUser(jid.toString(), false, jid.isGroup());
auto *pAction = data->contactaction;
auto &fullName = pAction->fullname;
if (fullName)
setUString(pUser->hContact, "Nick", fullName);
if (pAction->firstname) {
CMStringA str(pAction->firstname);
str.TrimRight();
setUString(pUser->hContact, "FirstName", str.c_str());
setUString(pUser->hContact, "LastName", fullName + str.GetLength() + 1);
}
else {
auto *p = strrchr(fullName, ' ');
if (p != 0) {
*p = 0;
setUString(pUser->hContact, "FirstName", fullName);
setUString(pUser->hContact, "LastName", p+1);
}
else {
setUString(pUser->hContact, "FirstName", "");
setUString(pUser->hContact, "LastName", fullName);
}
}
}
}
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