added response system from friend server

libretroshare/src/friend_server/fsitem.h

@@ -123,15 +123,18 @@ public:
 
     void serial_process(RsGenericSerializer::SerializeJob j,RsGenericSerializer::SerializeContext& ctx) override
     {
+        RS_SERIAL_PROCESS(nonce);
         RS_SERIAL_PROCESS(friend_invites);
     }
 
     virtual void clear() override
     {
         friend_invites.clear();
+        nonce = 0;
     }
     // specific members for that item
 
+    uint64_t nonce;
     std::map<std::string,bool> friend_invites;
 };
 

libretroshare/src/pgp/pgphandler.cc

@@ -1926,7 +1926,10 @@ bool PGPHandler::locked_syncPublicKeyring()
 #else
 	if(-1 == stat64(_pubring_path.c_str(), &buf))
 #endif
+    {
 		std::cerr << "PGPHandler::syncDatabase(): can't stat file " << _pubring_path << ". Can't sync public keyring." << std::endl;
+        buf.st_mtime = 0;
+    }
 
 	if(_pubring_last_update_time < buf.st_mtime)
 	{
@@ -1973,6 +1976,7 @@ bool PGPHandler::locked_syncTrustDatabase()
     {
         std::cerr << "PGPHandler::syncDatabase(): can't stat file " << _trustdb_path << ". Will force write it." << std::endl;
         _trustdb_changed = true ;	// we force write of trust database if it does not exist.
+        buf.st_mtime = 0;
     }
 
 	if(_trustdb_last_update_time < buf.st_mtime)

retroshare-friendserver/src/friendserver.cc

@@ -70,12 +70,21 @@ void FriendServer::handleClientPublish(const RsFriendServerClientPublishItem *it
         RsDbg() << *item ;
 
         // First of all, read PGP key and short invites, parse them, and check that they contain the same information
+        RsPeerId pid;
+        RsPgpFingerprint fpr;
 
-        FriendServer::handleIncomingClientData(item->pgp_public_key_b64,item->short_invite);
+        std::map<RsPeerId,PeerInfo>::iterator pi = handleIncomingClientData(item->pgp_public_key_b64,item->short_invite);
 
+        // No need to test for it==mCurrentClients.end() because it will be directly caught by the exception handling below even before.
         // Respond with a list of potential friends
 
+        RsFriendServerServerResponseItem *sr_item = new RsFriendServerServerResponseItem;
 
+        sr_item->nonce = pi->second.last_nonce;
+        sr_item->friend_invites = computeListOfFriendInvites(item->n_requested_friends,pi->first,pi->second.pgp_fingerprint);
+        sr_item->PeerId(item->PeerId());
+
+        mni->SendItem(sr_item);
     }
     catch(std::exception& e)
     {
@@ -89,7 +98,27 @@ void FriendServer::handleClientPublish(const RsFriendServerClientPublishItem *it
     mni->closeConnection(item->PeerId());
 }
 
-bool FriendServer::handleIncomingClientData(const std::string& pgp_public_key_b64,const std::string& short_invite_b64)
+std::map<std::string, bool> FriendServer::computeListOfFriendInvites(uint32_t nb_reqs_invites, const RsPeerId &pid, const RsPgpFingerprint &fpr)
+{
+    // For now, returns the first nb_reqs_invites from the currently known peer, that would not be the peer who's asking
+
+    std::map<std::string,bool> res;
+
+    for(auto it:mCurrentClientPeers)
+    {
+        if(it.first == pid)
+            continue;
+
+        res.insert(std::make_pair(it.second.short_certificate,false));	// for now we say that peers havn't been warned already
+
+        if(res.size() >= nb_reqs_invites)
+            break;
+    }
+
+    return res;
+}
+
+std::map<RsPeerId,PeerInfo>::iterator FriendServer::handleIncomingClientData(const std::string& pgp_public_key_b64,const std::string& short_invite_b64)
 {
         RsDbg() << "  Checking item data...";
 
@@ -146,9 +175,11 @@ bool FriendServer::handleIncomingClientData(const std::string& pgp_public_key_b6
 
         pi.short_certificate = short_invite_b64;
         pi.last_connection_TS = time(nullptr);
+
+        while(pi.last_nonce == 0)					// reuse the same identifier (so it's not really a nonce, but it's kept secret whatsoever).
             pi.last_nonce = RsRandom::random_u64();
 
-        return true;
+        return mCurrentClientPeers.find(shortInviteDetails.id);
 }
 
 

retroshare-friendserver/src/friendserver.h

@@ -32,6 +32,7 @@ class RsFriendServerClientPublishItem;
 
 struct PeerInfo
 {
+    RsPgpFingerprint pgp_fingerprint;
     std::string short_certificate;
     rstime_t last_connection_TS;
     uint64_t last_nonce;
@@ -53,7 +54,11 @@ private:
     void handleClientRemove(const RsFriendServerClientRemoveItem *item);
     void handleClientPublish(const RsFriendServerClientPublishItem *item);
 
-    bool handleIncomingClientData(const std::string& pgp_public_key_b64,const std::string& short_invite_b64);
+    // Adds the incoming peer data to the list of current clients and returns the
+    std::map<RsPeerId,PeerInfo>::iterator handleIncomingClientData(const std::string& pgp_public_key_b64,const std::string& short_invite_b64);
+
+    // Computes the appropriate list of short invites to send to a given peer.
+    std::map<std::string,bool> computeListOfFriendInvites(uint32_t nb_reqs_invites,const RsPeerId& pid,const RsPgpFingerprint& fpr);
 
     void autoWash();
     void debugPrint();