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Check CDN file hashes.

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This commit is contained in:
John Preston 2017-07-13 12:13:07 +03:00
parent cf02a4cc31
commit 2e0513a30f
2 changed files with 141 additions and 11 deletions
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129
Telegram/SourceFiles/storage/file_download.cpp
View File

@ -84,6 +84,7 @@ constexpr auto kDownloadPhotoPartSize = 64 * 1024; // 64kb for photo
constexpr auto kDownloadDocumentPartSize = 128 * 1024; // 128kb for document
constexpr auto kMaxFileQueries = 16; // max 16 file parts downloaded at the same time
constexpr auto kMaxWebFileQueries = 8; // max 8 http[s] files downloaded at the same time
constexpr auto kDownloadCdnPartSize = 128 * 1024; // 128kb for cdn requests
} // namespace
@ -452,10 +453,19 @@ bool mtpFileLoader::loadPart() {
}
int mtpFileLoader::partSize() const {
if (_locationType == UnknownFileLocation) {
return kDownloadPhotoPartSize;
}
return kDownloadDocumentPartSize;
return kDownloadCdnPartSize;
// Different part sizes are not supported for now :(
// Because we start downloading with some part size
// and then we get a cdn-redirect where we support only
// fixed part size download for hash checking.
//
//if (_cdnDcId) {
// return kDownloadCdnPartSize;
//} else if (_locationType == UnknownFileLocation) {
// return kDownloadPhotoPartSize;
//}
//return kDownloadDocumentPartSize;
}
mtpFileLoader::RequestData mtpFileLoader::prepareRequest(int offset) const {
@ -492,6 +502,21 @@ void mtpFileLoader::makeRequest(int offset) {
placeSentRequest(send(), requestData);
}
void mtpFileLoader::requestMoreCdnFileHashes() {
if (_cdnHashesRequestId || _cdnUncheckedParts.empty()) {
return;
}
auto offset = _cdnUncheckedParts.cbegin()->first;
auto requestData = RequestData();
requestData.dcId = _dcId;
requestData.dcIndex = 0;
requestData.offset = offset;
auto shiftedDcId = MTP::downloadDcId(requestData.dcId, requestData.dcIndex);
auto requestId = _cdnHashesRequestId = MTP::send(MTPupload_GetCdnFileHashes(MTP_bytes(_cdnToken), MTP_int(offset)), rpcDone(&mtpFileLoader::getCdnFileHashesDone), rpcFail(&mtpFileLoader::cdnPartFailed), shiftedDcId);
placeSentRequest(requestId, requestData);
}
void mtpFileLoader::normalPartLoaded(const MTPupload_File &result, mtpRequestId requestId) {
Expects(result.type() == mtpc_upload_fileCdnRedirect || result.type() == mtpc_upload_file);
@ -550,14 +575,88 @@ void mtpFileLoader::cdnPartLoaded(const MTPupload_CdnFile &result, mtpRequestId
auto decryptInPlace = result.c_upload_cdnFile().vbytes.v;
MTP::aesCtrEncrypt(decryptInPlace.data(), decryptInPlace.size(), key.data(), &state);
auto bytes = gsl::as_bytes(gsl::make_span(decryptInPlace));
return partLoaded(offset, bytes);
switch (checkCdnFileHash(offset, bytes)) {
case CheckCdnHashResult::NoHash: {
_cdnUncheckedParts.emplace(offset, decryptInPlace);
requestMoreCdnFileHashes();
} return;
case CheckCdnHashResult::Invalid: {
LOG(("API Error: Wrong cdnFileHash for offset %1.").arg(offset));
cancel(true);
} return;
case CheckCdnHashResult::Good: {
partLoaded(offset, bytes);
} return;
}
Unexpected("Result of checkCdnFileHash()");
}
void mtpFileLoader::reuploadDone(const MTPBool &result, mtpRequestId requestId) {
mtpFileLoader::CheckCdnHashResult mtpFileLoader::checkCdnFileHash(int offset, base::const_byte_span bytes) {
auto cdnFileHashIt = _cdnFileHashes.find(offset);
if (cdnFileHashIt == _cdnFileHashes.cend()) {
return CheckCdnHashResult::NoHash;
}
auto realHash = hashSha256(bytes.data(), bytes.size());
if (!base::compare_bytes(gsl::as_bytes(gsl::make_span(realHash)), gsl::as_bytes(gsl::make_span(cdnFileHashIt->second.hash)))) {
return CheckCdnHashResult::Invalid;
}
return CheckCdnHashResult::Good;
}
void mtpFileLoader::reuploadDone(const MTPVector<MTPCdnFileHash> &result, mtpRequestId requestId) {
auto offset = finishSentRequestGetOffset(requestId);
addCdnHashes(result.v);
makeRequest(offset);
}
void mtpFileLoader::getCdnFileHashesDone(const MTPVector<MTPCdnFileHash> &result, mtpRequestId requestId) {
Expects(_cdnHashesRequestId == requestId);
_cdnHashesRequestId = 0;
auto offset = finishSentRequestGetOffset(requestId);
addCdnHashes(result.v);
auto someMoreChecked = false;
for (auto i = _cdnUncheckedParts.begin(); i != _cdnUncheckedParts.cend();) {
auto bytes = gsl::as_bytes(gsl::make_span(i->second));
switch (checkCdnFileHash(offset, bytes)) {
case CheckCdnHashResult::NoHash: {
++i;
} break;
case CheckCdnHashResult::Invalid: {
LOG(("API Error: Wrong cdnFileHash for offset %1.").arg(offset));
cancel(true);
return;
} break;
case CheckCdnHashResult::Good: {
someMoreChecked = true;
auto goodOffset = i->first;
auto goodBytes = std::move(i->second);
i = _cdnUncheckedParts.erase(i);
auto finished = (i == _cdnUncheckedParts.cend());
partLoaded(goodOffset, gsl::as_bytes(gsl::make_span(goodBytes)));
if (finished) {
// Perhaps we were destroyed already?..
return;
}
} break;
default: Unexpected("Result of checkCdnFileHash()");
}
}
if (!someMoreChecked) {
LOG(("API Error: Could not find cdnFileHash for offset %1 after getCdnFileHashes request.").arg(offset));
cancel(true);
} else {
requestMoreCdnFileHashes();
}
}
void mtpFileLoader::placeSentRequest(mtpRequestId requestId, const RequestData &requestData) {
_downloader->requestedAmountIncrement(requestData.dcId, requestData.dcIndex, partSize());
++_queue->queriesCount;
@ -669,9 +768,12 @@ bool mtpFileLoader::partFailed(const RPCError &error) {
bool mtpFileLoader::cdnPartFailed(const RPCError &error, mtpRequestId requestId) {
if (MTP::isDefaultHandledError(error)) return false;
if (requestId == _cdnHashesRequestId) {
_cdnHashesRequestId = 0;
}
if (error.type() == qstr("FILE_TOKEN_INVALID") || error.type() == qstr("REQUEST_TOKEN_INVALID")) {
auto offset = finishSentRequestGetOffset(requestId);
changeCDNParams(offset, 0, QByteArray(), QByteArray(), QByteArray());
changeCDNParams(offset, 0, QByteArray(), QByteArray(), QByteArray(), QVector<MTPCdnFileHash>());
return true;
}
return partFailed(error);
@ -686,10 +788,18 @@ void mtpFileLoader::cancelRequests() {
}
void mtpFileLoader::switchToCDN(int offset, const MTPDupload_fileCdnRedirect &redirect) {
changeCDNParams(offset, redirect.vdc_id.v, redirect.vfile_token.v, redirect.vencryption_key.v, redirect.vencryption_iv.v);
changeCDNParams(offset, redirect.vdc_id.v, redirect.vfile_token.v, redirect.vencryption_key.v, redirect.vencryption_iv.v, redirect.vcdn_file_hashes.v);
}
void mtpFileLoader::changeCDNParams(int offset, MTP::DcId dcId, const QByteArray &token, const QByteArray &encryptionKey, const QByteArray &encryptionIV) {
void mtpFileLoader::addCdnHashes(const QVector<MTPCdnFileHash> &hashes) {
for_const (auto &hash, hashes) {
t_assert(hash.type() == mtpc_cdnFileHash);
auto &data = hash.c_cdnFileHash();
_cdnFileHashes.emplace(data.voffset.v, CdnFileHash { data.vlimit.v, data.vhash.v });
}
}
void mtpFileLoader::changeCDNParams(int offset, MTP::DcId dcId, const QByteArray &token, const QByteArray &encryptionKey, const QByteArray &encryptionIV, const QVector<MTPCdnFileHash> &hashes) {
if (dcId != 0 && (encryptionKey.size() != MTP::CTRState::KeySize || encryptionIV.size() != MTP::CTRState::IvecSize)) {
LOG(("Message Error: Wrong key (%1) / iv (%2) size in CDN params").arg(encryptionKey.size()).arg(encryptionIV.size()));
cancel(true);
@ -704,6 +814,7 @@ void mtpFileLoader::changeCDNParams(int offset, MTP::DcId dcId, const QByteArray
_cdnToken = token;
_cdnEncryptionKey = encryptionKey;
_cdnEncryptionIV = encryptionIV;
addCdnHashes(hashes);
if (resendAllRequests && !_sentRequests.empty()) {
auto resendOffsets = std::vector<int>();

23
Telegram/SourceFiles/storage/file_download.h
View File

@ -211,6 +211,12 @@ private:
int dcIndex = 0;
int offset = 0;
};
struct CdnFileHash {
CdnFileHash(int limit, QByteArray hash) : limit(limit), hash(hash) {
}
int limit = 0;
QByteArray hash;
};
bool tryLoadLocal() override;
void cancelRequests() override;
@ -223,7 +229,9 @@ private:
void normalPartLoaded(const MTPupload_File &result, mtpRequestId requestId);
void webPartLoaded(const MTPupload_WebFile &result, mtpRequestId requestId);
void cdnPartLoaded(const MTPupload_CdnFile &result, mtpRequestId requestId);
void reuploadDone(const MTPBool &result, mtpRequestId requestId);
void reuploadDone(const MTPVector<MTPCdnFileHash> &result, mtpRequestId requestId);
void requestMoreCdnFileHashes();
void getCdnFileHashesDone(const MTPVector<MTPCdnFileHash> &result, mtpRequestId requestId);
void partLoaded(int offset, base::const_byte_span bytes);
bool partFailed(const RPCError &error);
@ -232,7 +240,15 @@ private:
void placeSentRequest(mtpRequestId requestId, const RequestData &requestData);
int finishSentRequestGetOffset(mtpRequestId requestId);
void switchToCDN(int offset, const MTPDupload_fileCdnRedirect &redirect);
void changeCDNParams(int offset, MTP::DcId dcId, const QByteArray &token, const QByteArray &encryptionKey, const QByteArray &encryptionIV);
void addCdnHashes(const QVector<MTPCdnFileHash> &hashes);
void changeCDNParams(int offset, MTP::DcId dcId, const QByteArray &token, const QByteArray &encryptionKey, const QByteArray &encryptionIV, const QVector<MTPCdnFileHash> &hashes);
enum class CheckCdnHashResult {
NoHash,
Invalid,
Good,
};
CheckCdnHashResult checkCdnFileHash(int offset, base::const_byte_span bytes);
std::map<mtpRequestId, RequestData> _sentRequests;
@ -253,6 +269,9 @@ private:
QByteArray _cdnToken;
QByteArray _cdnEncryptionKey;
QByteArray _cdnEncryptionIV;
std::map<int, CdnFileHash> _cdnFileHashes;
std::map<int, QByteArray> _cdnUncheckedParts;
mtpRequestId _cdnHashesRequestId = 0;
};