Fork for poking around in the original "client implementation for p≡p update server".
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downloadclient/downloadclient.cc

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// this file is under GNU General Public License 3.0
// see LICENSE.txt
#include "downloadclient.hh"
#include <iostream>
#include <sstream>
namespace pEp {
namespace UpdateClient {
PublicKey load_key(string filename)
{
CryptoPP::RSA::PublicKey key;
std::ifstream ifs{filename, std::ios::binary};
CryptoPP::ByteQueue queue;
CryptoPP::FileSource file(ifs, true);
file.TransferTo(queue);
queue.MessageEnd();
key.Load(queue);
return key;
}
string update(product p, PublicKey update_key, notifyRead_t notifyRead)
{
UpdateStream us { UpdateDevice(p) };
try {
us->open(update_key, notifyRead);
}
catch (exception&) { }
if (us->filename() == "")
throw DownloadError();
return us->filename();
}
string update(product p, string keyfile, notifyRead_t notifyRead)
{
PublicKey update_key = load_key(keyfile);
return update(p, update_key, notifyRead);
}
}
}