path: root/src/main.cpp

#include "../include/Channel.hpp"
#include "../include/ChannelSidePanel.hpp"
#include "../include/UsersSidePanel.hpp"
#include "../include/ChannelTopPanel.hpp"
#include "../include/Cache.hpp"
#include "../include/ResourceCache.hpp"
#include "../include/Video.hpp"
#include "../include/Command.hpp"
#include "../include/Settings.hpp"
#include "../include/ColorScheme.hpp"
#include "../include/GlobalContextMenu.hpp"
#include "../include/StringUtils.hpp"
#include "../include/ImagePreview.hpp"
#include <string>
#include <SFML/Graphics.hpp>
#include <cstring>
#include <boost/filesystem/path.hpp>
#include <odhtdb/Database.hpp>
#include <odhtdb/Signature.hpp>
#include <odhtdb/bin2hex.hpp>
#include <odhtdb/hex2bin.hpp>
#include <ntp/NtpClient.hpp>
#include <sibs/SafeSerializer.hpp>
#include <X11/Xlib.h>

using namespace std;
using namespace dchat;

static bool focused = true;

static void channelChangeUserNickname(Channel *channel, const StringView data, const odhtdb::Signature::PublicKey &userPublicKey)
{
    auto user = channel->getUserByPublicKey(userPublicKey);
    if(!user)
    {
        fprintf(stderr, "Nickname change: user with public key %s not found in channel %s\n", userPublicKey.toString().c_str(), channel->getName().c_str());
        return;
    }
    
    sibs::SafeDeserializer deserializer((const u8*)data.data, data.size);
    u8 nameLength = deserializer.extract<u8>();
    if(nameLength > 0)
    {
        user->name.resize(nameLength);
        deserializer.extract((u8*)&user->name[0], nameLength);
    }
    // We dont care if there is more data to read (malicious packet), we already got all the data we need
}

static void channelAddStoredMessage(Channel *channel, const odhtdb::Hash &requestHash, const odhtdb::Signature::PublicKey &creatorPublicKey, const StringView decryptedObject, u64 timestamp)
{
    User *user = channel->getUserByPublicKey(creatorPublicKey);
    if(!user)
    {
        fprintf(stderr, "Missing user? %s\n", creatorPublicKey.toString().c_str());
        return;
    }
    
    if(decryptedObject.size > 1)
    {
        auto channelDataType = (ChannelDataType)static_cast<const char*>(decryptedObject.data)[0];
        StringView decryptedData((const char*)decryptedObject.data + 1, decryptedObject.size - 1);
        switch(channelDataType)
        {
            case ChannelDataType::ADD_MESSAGE:
            {
                string msg(decryptedData.data, decryptedData.size);
                channel->addLocalMessage(msg, user, ntp::NtpTimestamp::fromCombined(timestamp).seconds, requestHash);
                if(!focused)
                {
                    stringReplaceChar(msg, "'", "");
                    stringReplaceChar(msg, "\\", "");
                    string cmd = "notify-send dchat '";
                    cmd += msg;
                    cmd += "'";
                    system(cmd.c_str());
                }
                break;
            }
            case ChannelDataType::DELETE_MESSAGE:
            {
                sibs::SafeDeserializer deserializer((const u8*)decryptedData.data, decryptedData.size);
                odhtdb::Hash messageId;
                deserializer.extract((u8*)messageId.getData(), odhtdb::HASH_BYTE_SIZE);
                channel->deleteLocalMessage(messageId, creatorPublicKey);
                break;
            }
            case ChannelDataType::NICKNAME_CHANGE:
            {
                try
                {
                    channelChangeUserNickname(channel, decryptedData, creatorPublicKey);
                }
                catch(sibs::DeserializeException &e)
                {
                    fprintf(stderr, "Failed to deserialize nick change\n");
                }
                break;
            }
            default:
                fprintf(stderr, "Got unexpected channel data type: %u\n", channelDataType);
                break;
        }
    }
    else
    {
        fprintf(stderr, "ADD_DATA packet too small, ignoring...\n");
    }
}

int main(int argc, char **argv)
{
    /*
    boost::filesystem::path programPath(argv[0]);
    auto parentPath = programPath.parent_path();
    printf("parent path: %s\n", parentPath.string().c_str());
    boost::filesystem::current_path(parentPath); // Ensures loading of resources works no matter which path we run this executable from
    */
    
    const sf::Int64 FRAMERATE_FOCUSED = 144;
    const sf::Int64 FRAMERATE_NOT_FOCUSED = 10;
    
    XInitThreads();
    sf::RenderWindow window(sf::VideoMode(1280, 768), "dchat");
    window.setVerticalSyncEnabled(false);
    window.setFramerateLimit(FRAMERATE_FOCUSED);
    
    //Video video(500, 500, "https://www.youtube.com/watch?v=bs0-EX9mJmg");
    
    Cache cache;
    Cache::loadBindsFromFile();
    
    Channel offlineChannel("Offline");
    ChannelSidePanel::addChannel(&offlineChannel);
    Channel::setCurrent(&offlineChannel);
    
    vector<Channel*> channels;
    
    vector<odhtdb::DatabaseNode> waitingToJoinChannels;
    odhtdb::MapHash<odhtdb::StoredNodeInfo> localNodeUsers;
    string currentUsername;
    string currentPassword;
    recursive_mutex channelMessageMutex;
    bool waitingToJoin = false;
    bool loggedIn = false;
    sf::Clock lastFocusedTimer;
    
    odhtdb::Database *database = nullptr;
    odhtdb::DatabaseCallbackFuncs callbackFuncs;
    
    callbackFuncs.createNodeCallbackFunc = [&waitingToJoinChannels, &database, &channels, &channelMessageMutex, &waitingToJoin, &localNodeUsers, &lastFocusedTimer](const odhtdb::DatabaseCreateNodeRequest &request)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        //printf("Create node callback func %s\n", request.nodeHash->toString().c_str());
        
        auto nodeUserData = localNodeUsers.find(*request.nodeHash);
        if(nodeUserData == localNodeUsers.end()) return;
        
        User *localUser;
        if(nodeUserData->second.userKeyPair->getPublicKey() == *request.creatorPublicKey)
            localUser = new OnlineLocalUser("NoName", *nodeUserData->second.userKeyPair);
        else
            localUser = new OfflineUser("You");
        
        shared_ptr<odhtdb::Hash> databaseNodeHash = make_shared<odhtdb::Hash>();
        memcpy(databaseNodeHash->getData(), request.nodeHash->getData(), odhtdb::HASH_BYTE_SIZE);
        odhtdb::DatabaseNode databaseNode(nodeUserData->second.nodeEncryptionKey, databaseNodeHash);
        Channel *channel = new Channel("NoChannelName", databaseNode, localUser, database);
        ChannelSidePanel::addChannel(channel);
        channels.push_back(channel);
        Channel::setCurrent(channel);
        
        if(localUser->type == User::Type::OFFLINE)
        {
            User *nodeCreatorUser = new OnlineRemoteUser("NoName", *request.creatorPublicKey);
            channel->addUserLocally(nodeCreatorUser);
        }
        
        for(vector<odhtdb::DatabaseNode>::iterator it = waitingToJoinChannels.begin(); it != waitingToJoinChannels.end(); ++it)
        {
            if(*request.nodeHash == *it->getRequestHash())
            {
                waitingToJoin = true;
                waitingToJoinChannels.erase(it);
                return;
            }
        }
    };
    
    callbackFuncs.addNodeCallbackFunc = [&channels, &channelMessageMutex, &lastFocusedTimer](const odhtdb::DatabaseAddNodeRequest &request)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        //printf("Add node callback func %s\n", request.requestHash->toString().c_str());
        for(Channel *channel : channels)
        {
            if(*request.nodeHash == *channel->getNodeInfo().getRequestHash())
            {
                channelAddStoredMessage(channel, *request.requestHash, *request.creatorPublicKey, StringView((const char*)request.decryptedData.data, request.decryptedData.size), request.timestamp);
                lastFocusedTimer.restart();
                return;
            }
        }
    };
    
    callbackFuncs.addUserCallbackFunc = [&channels, &channelMessageMutex, &waitingToJoin, &localNodeUsers, &lastFocusedTimer](const odhtdb::DatabaseAddUserRequest &request)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        printf("Add user callback. Channel to add user to: %s\n", request.nodeHash->toString().c_str());
        for(Channel *channel : channels)
        {
            printf("My channel: %s (%s)\n", channel->getNodeInfo().getRequestHash()->toString().c_str(), channel->getName().c_str());
            if(*request.nodeHash == *channel->getNodeInfo().getRequestHash())
            {
                printf("Add user to one of my channels\n");
                auto nodeUserData = localNodeUsers.find(*request.nodeHash);
                
                User *userToAdd = channel->getUserByPublicKey(*request.userToAddPublicKey);
                if(userToAdd)
                {
                    fprintf(stderr, "User %s already exists in channel\n", request.userToAddPublicKey->toString().c_str());
                    return;
                }
                
                lastFocusedTimer.restart();
                
                if(*request.userToAddPublicKey == nodeUserData->second.userKeyPair->getPublicKey())
                {
                    printf("You were added to channel %s by %s\n", request.nodeHash->toString().c_str(), request.creatorPublicKey->toString().c_str());
                    channel->replaceLocalUser(new OnlineLocalUser("NoName", *nodeUserData->second.userKeyPair));
                    waitingToJoin = false;
                    return;
                }
                
                User *newRemoteUser = new OnlineRemoteUser("NoName", *request.userToAddPublicKey);
                channel->addUserLocally(newRemoteUser);
                return;
            }
        }
    };
    database = new odhtdb::Database("bootstrap.ring.cx", 4222, Cache::getDchatDir(), callbackFuncs);
    
    auto addSystemMessage = [&lastFocusedTimer](const std::string &msg)
    {
        Channel::getCurrent()->addLocalMessage(msg, Channel::getCurrent()->getSystemUser());
        lastFocusedTimer.restart();
    };
    
    // Login to account
    Command::add("login", [&localNodeUsers, &database, &channels, &loggedIn, &channelMessageMutex, &currentUsername, &currentPassword](const vector<string> &args)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        if(args.size() != 2)
        {
            fprintf(stderr, "Expected 2 arguments for command login (username and password), got %u argument(s)\n", args.size());
            return;
        }
        
        try
        {
            localNodeUsers = database->getStoredNodeUserInfoDecrypted(args[0], args[1]);
            
            ChannelSidePanel::removeAllChannels();
            for(Channel *channel : channels)
            {
                delete channel;
            }
            channels.clear();
            
            printf("Loading %u channel(s) for user\n", localNodeUsers.size());
            for(auto &localNodeUser : localNodeUsers)
            {
                database->loadNode(localNodeUser.first);
            }
            
            printf("Successfully logged into user %s\n", args[0].c_str());
            currentUsername = args[0];
            currentPassword = args[1];
            loggedIn = true;
        }
        catch(std::exception &e)
        {
            fprintf(stderr, "Failed to login, reason: %s\n", e.what());
        }
    });
    
    // Register account
    Command::add("register", [&localNodeUsers, &database, &channels, &loggedIn, &channelMessageMutex, &currentUsername, &currentPassword](const vector<string> &args)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        if(args.size() != 2)
        {
            fprintf(stderr, "Expected 2 arguments for command register (username and password), got %u argument(s)\n", args.size());
            return;
        }
        
        try
        {
            database->storeUserWithoutNodes(args[0], args[1]);
        }
        catch(odhtdb::SqlExecException &e)
        {
            fprintf(stderr, "User with name %s already exists in storage\n", args[0].c_str());
            return;
        }
        
        printf("Registered user %s\n", args[0].c_str());
        
        ChannelSidePanel::removeAllChannels();
        for(Channel *channel : channels)
        {
            delete channel;
        }
        channels.clear();
        localNodeUsers.clear();
        
        printf("Successfully logged into user %s\n", args[0].c_str());
        currentUsername = args[0];
        currentPassword = args[1];
        loggedIn = true;
    });
    
    // TODO: Use database->addData to change channel name
    // Create channel
    Command::add("cc", [&database, &channels, &channelMessageMutex, &loggedIn, &localNodeUsers, &currentUsername, &currentPassword, &lastFocusedTimer, addSystemMessage](const vector<string> &args)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        if(args.size() != 1)
        {
            fprintf(stderr, "Expected 1 argument for command cc (channel name), got %u argument(s)\n", args.size());
            return;
        }
        
        if(!loggedIn)
        {
            fprintf(stderr, "You are not logged in. Please login before creating a channel\n");
            return;
        }
        
        auto createResponse = database->create();
        printf("Created channel %s\n", createResponse->getRequestHash()->toString().c_str());
        
        User *newLocalUser = new OnlineLocalUser("NoName", *createResponse->getNodeAdminKeyPair());
        odhtdb::DatabaseNode databaseNode(createResponse->getNodeEncryptionKey(), createResponse->getRequestHash());
        Channel *channel = new Channel(args[0], databaseNode, newLocalUser, database);
        ChannelSidePanel::addChannel(channel);
        channels.push_back(channel);
        Channel::setCurrent(channel);
        lastFocusedTimer.restart();
        
        localNodeUsers[*createResponse->getRequestHash()] = { createResponse->getNodeEncryptionKey(), createResponse->getNodeAdminKeyPair() };
        database->storeNodeInfoForUserEncrypted(databaseNode, currentUsername, currentPassword, *createResponse->getNodeAdminKeyPair());
        addSystemMessage("Channel created and stored in database");
    });
    
    // Create invite key
    Command::add("invite", [&channelMessageMutex, &offlineChannel, &database, addSystemMessage](const vector<string> &args)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        if(args.size() != 0)
        {
            fprintf(stderr, "Expected 0 arguments for command invite, got %u argument(s)\n", args.size());
            return;
        }
        
        Channel *currentChannel = Channel::getCurrent();
        if(currentChannel == &offlineChannel)
        {
            addSystemMessage("You need to be in a channel to create an invite key");
            return;
        }
        
        // TODO: Verify user has permission to add users before generating invite key, otherwise invite will fail and the users attempting to join will wait in futile
        
        auto channelNodeHash = currentChannel->getNodeInfo().getRequestHash();
        auto channelEncryptionKey = currentChannel->getNodeInfo().getNodeEncryptionKey();
        shared_ptr<odhtdb::OwnedByteArray> encryptionKey = make_shared<odhtdb::OwnedByteArray>(new u8[odhtdb::ENCRYPTION_KEY_BYTE_SIZE], odhtdb::ENCRYPTION_KEY_BYTE_SIZE);
        odhtdb::Encryption::generateKey((unsigned char*)encryptionKey->data);
        
        string inviteKey = odhtdb::bin2hex((const char*)channelNodeHash->getData(), channelNodeHash->getSize());
        inviteKey += '&';
        inviteKey += odhtdb::bin2hex((const char*)encryptionKey->data, odhtdb::ENCRYPTION_KEY_BYTE_SIZE);
        
        string msg = "You are now listening for users to join the channel using the key: ";
        msg += inviteKey;
        
        addSystemMessage(msg);
        printf("%s\n", msg.c_str());
        
        sibs::SafeSerializer keySerializer;
        keySerializer.add((const u8*)channelNodeHash->getData(), channelNodeHash->getSize());
        keySerializer.add((const u8*)encryptionKey->data, odhtdb::ENCRYPTION_KEY_BYTE_SIZE);
        dht::InfoHash key = odhtdb::Database::getInfoHash(keySerializer.getBuffer().data(), keySerializer.getBuffer().size());
        database->receiveCustomMessage(key, [&channelMessageMutex, encryptionKey, channelEncryptionKey, currentChannel, &database](const void *data, usize size)
        {
            // TODO: User can remove channel @currentChannel before we get here, meaning @currentChannel is deleted and would be invalid; causing the program to crash
            try
            {
                sibs::SafeDeserializer deserializer((const u8*)data, size);
                u8 userToAddPublicKeyRaw[odhtdb::PUBLIC_KEY_NUM_BYTES];
                deserializer.extract(userToAddPublicKeyRaw, odhtdb::PUBLIC_KEY_NUM_BYTES);
                odhtdb::Signature::PublicKey userToAddPublicKey((const char*)userToAddPublicKeyRaw, odhtdb::PUBLIC_KEY_NUM_BYTES);
                string unsignedEncryptedMsg = userToAddPublicKey.unsign(odhtdb::DataView((void*)deserializer.getBuffer(), deserializer.getSize()));
                
                sibs::SafeDeserializer encryptedDataDeserializer((const u8*)unsignedEncryptedMsg.data(), unsignedEncryptedMsg.size());
                u8 nonce[odhtdb::ENCRYPTION_NONCE_BYTE_SIZE];
                encryptedDataDeserializer.extract(nonce, odhtdb::ENCRYPTION_NONCE_BYTE_SIZE);
                odhtdb::Decryption decryptedMsg(odhtdb::DataView((void*)encryptedDataDeserializer.getBuffer(), encryptedDataDeserializer.getSize()), 
                                                       odhtdb::DataView(nonce, odhtdb::ENCRYPTION_NONCE_BYTE_SIZE), 
                                                       encryptionKey->getView());
                
                // TODO: Create GUI for accepting users into channel instead of accepting ALL users
                sibs::SafeSerializer encryptedDataSerializer;
                encryptedDataSerializer.add((const u8*)channelEncryptionKey->data, channelEncryptionKey->size);
                encryptedDataSerializer.add((const u8*)userToAddPublicKey.getData(), userToAddPublicKey.getSize());
                odhtdb::Encryption encryptedChannelKey(odhtdb::DataView((void*)encryptedDataSerializer.getBuffer().data(), encryptedDataSerializer.getBuffer().size()), encryptionKey->getView());
                
                sibs::SafeSerializer serializer;
                serializer.add((const u8*)encryptedChannelKey.getNonce().data, encryptedChannelKey.getNonce().size);
                serializer.add((const u8*)encryptedChannelKey.getCipherText().data, encryptedChannelKey.getCipherText().size);
                const auto &localUserPublicKey = static_cast<OnlineLocalUser*>(currentChannel->getLocalUser())->getPublicKey();
                auto localUserGroups = database->getUserGroups(*currentChannel->getNodeInfo().getRequestHash(), localUserPublicKey);
                if(localUserGroups.empty())
                {
                    fprintf(stderr, "No group to add user to...\n");
                    return sibs::SafeSerializer();
                }
                lock_guard<recursive_mutex> lock(channelMessageMutex);
                currentChannel->addUser(userToAddPublicKey, localUserGroups[0].getView());
                return serializer;
            }
            catch(std::exception &e)
            {
                fprintf(stderr, "Failed while parsing user data to add to channel, reason: %s\n", e.what());
            }
            return sibs::SafeSerializer();
        });
    });
    
    // Join channel using invite key
    Command::add("jc", [&loggedIn, &database, &localNodeUsers, &channelMessageMutex, &waitingToJoin, &waitingToJoinChannels, &currentUsername, &currentPassword](const vector<string> &args)
    {
        lock_guard<recursive_mutex> lock(channelMessageMutex);
        if(args.size() != 1)
        {
            fprintf(stderr, "Expected 1 argument for command jc (channel join key), got %u argument(s)\n", args.size());
            return;
        }
        
        if(args[0].size() != 129)
        {
            fprintf(stderr, "Expected join key to be 129 characters, was %u character(s)\n", args[0].size());
            return;
        }
        
        if(!loggedIn)
        {
            fprintf(stderr, "You are not logged in. Please login before joining a channel\n");
            return;
        }
        
        string nodeHashBinRaw = odhtdb::hex2bin(args[0].c_str(), 64);
        shared_ptr<odhtdb::Hash> nodeHash = make_shared<odhtdb::Hash>();
        memcpy(nodeHash->getData(), nodeHashBinRaw.data(), nodeHashBinRaw.size());
        auto nodeUserIt = localNodeUsers.find(*nodeHash);
        if(nodeUserIt != localNodeUsers.end())
        {
            fprintf(stderr, "You have already joined the channel %s\n", args[0].c_str());
            return;
        }
        
        string encryptionKeyBinRaw = odhtdb::hex2bin(args[0].c_str() + 65, 64);
        shared_ptr<odhtdb::OwnedByteArray> encryptionKey = make_shared<odhtdb::OwnedByteArray>(new u8[odhtdb::ENCRYPTION_KEY_BYTE_SIZE], odhtdb::ENCRYPTION_KEY_BYTE_SIZE);
        memcpy(encryptionKey->data, encryptionKeyBinRaw.data(), encryptionKeyBinRaw.size());
        
        shared_ptr<odhtdb::Signature::KeyPair> keyPair = make_shared<odhtdb::Signature::KeyPair>();
        sibs::SafeSerializer serializer;
        serializer.add((const u8*)keyPair->getPublicKey().getData(), keyPair->getPublicKey().getSize());
        
        const char *msg = "please let me join";
        odhtdb::Encryption encryptedJoinMsg(odhtdb::DataView((void*)msg, strlen(msg)), encryptionKey->getView());
        sibs::SafeSerializer encryptedDataSerializer;
        encryptedDataSerializer.add((const u8*)encryptedJoinMsg.getNonce().data, encryptedJoinMsg.getNonce().size);
        encryptedDataSerializer.add((const u8*)encryptedJoinMsg.getCipherText().data, encryptedJoinMsg.getCipherText().size);
        string signedEncryptedMsg = keyPair->getPrivateKey().sign(odhtdb::DataView(encryptedDataSerializer.getBuffer().data(), encryptedDataSerializer.getBuffer().size()));
        serializer.add((const u8*)signedEncryptedMsg.data(), signedEncryptedMsg.size());
        
        sibs::SafeSerializer keySerializer;
        keySerializer.add((const u8*)nodeHash->getData(), nodeHash->getSize());
        keySerializer.add((const u8*)encryptionKeyBinRaw.data(), odhtdb::ENCRYPTION_KEY_BYTE_SIZE);
        dht::InfoHash key = odhtdb::Database::getInfoHash(keySerializer.getBuffer().data(), keySerializer.getBuffer().size());
        database->sendCustomMessage(key, move(serializer.getBuffer()), [&database, nodeHash, encryptionKey, &waitingToJoinChannels, &channelMessageMutex, keyPair, &currentUsername, &currentPassword, &localNodeUsers](bool gotResponse, const void *data, usize size)
        {
            if(!gotResponse)
            {
                printf("We didn't get a response from anybody in the channel. Is there nobody that can add us (nobody with the permission required to do so or no online users) or is the node hash invalid?\n");
                return false;
            }
            
            try
            {
                sibs::SafeDeserializer deserializer((const u8*)data, size);
                u8 nonce[odhtdb::ENCRYPTION_NONCE_BYTE_SIZE];
                deserializer.extract(nonce, odhtdb::ENCRYPTION_NONCE_BYTE_SIZE);
                odhtdb::Decryption decryptedMsg(odhtdb::DataView((void*)deserializer.getBuffer(), deserializer.getSize()), 
                                                       odhtdb::DataView(nonce, odhtdb::ENCRYPTION_NONCE_BYTE_SIZE), 
                                                       encryptionKey->getView());
                if(decryptedMsg.getDecryptedText().size != odhtdb::ENCRYPTION_KEY_BYTE_SIZE + odhtdb::PUBLIC_KEY_NUM_BYTES)
                {
                    fprintf(stderr, "Invite response was of unexpected size, maybe it wasn't meant for us?\n");
                    return true;
                }
                
                odhtdb::DataView channelEncryptionKeyRaw(decryptedMsg.getDecryptedText().data, odhtdb::ENCRYPTION_KEY_BYTE_SIZE);
                odhtdb::DataView invitedUserPublicKey((u8*)decryptedMsg.getDecryptedText().data + odhtdb::ENCRYPTION_KEY_BYTE_SIZE, odhtdb::PUBLIC_KEY_NUM_BYTES);
                if(memcmp(keyPair->getPublicKey().getData(), invitedUserPublicKey.data, odhtdb::PUBLIC_KEY_NUM_BYTES) != 0)
                {
                    fprintf(stderr, "Invite response was not meant for us\n");
                    return true;
                }
                
                shared_ptr<odhtdb::OwnedByteArray> channelEncryptionKey = make_shared<odhtdb::OwnedByteArray>(new u8[channelEncryptionKeyRaw.size], channelEncryptionKeyRaw.size);
                memcpy(channelEncryptionKey->data, channelEncryptionKeyRaw.data, channelEncryptionKeyRaw.size);
                odhtdb::DatabaseNode databaseNode(channelEncryptionKey, nodeHash);
                localNodeUsers[*nodeHash] = { channelEncryptionKey, keyPair };
                database->storeNodeInfoForUserEncrypted(databaseNode, currentUsername, currentPassword, *keyPair);
                printf("Got a response from a person in the channel, we might get added...\n");
                waitingToJoinChannels.push_back(databaseNode);
                lock_guard<recursive_mutex> lock(channelMessageMutex);
                database->seed(databaseNode);
                return false;
            }
            catch(std::exception &e)
            {
                fprintf(stderr, "Failed while parsing join response for invite link, reason: %s\n", e.what());
            }
            return true;
            
        });
        waitingToJoin = true;
    });
    
    // Scale UI
    Command::add("scale", [](const vector<string> &args)
    {
        if(args.size() != 1)
        {
            fprintf(stderr, "Expected 1 argument for command scale, got %u argument(s)\n", args.size());
            return;
        }
        
        float scaling = stof(args[0]);
        Settings::setScaling(scaling);
        printf("UI scaling set to %f\n", scaling);
    });
    
    Command::add("addbind", [addSystemMessage](const vector<string> &args)
    {
        if(args.size() != 2)
        {
            string errMsg = "Expected 2 arguments for command addbind, got ";
            errMsg += to_string(args.size());
            errMsg += " argument(s)";
            addSystemMessage(errMsg);
            return;
        }
        
        string key = ":";
        key += args[0];
        key += ":";
        
        if(key.size() > 255)
        {
            // 253 = bind + two colons
            addSystemMessage("Bind is too long. Max size is 253 bytes");
            return;
        }
        
        bool bindAdded = Chatbar::addBind(key, args[1]);
        if(bindAdded)
            addSystemMessage("Bind added");
        else
            addSystemMessage("Bind already exists. Remove it first if you want to replace it");
    });
    
    Command::add("removebind", [addSystemMessage](const vector<string> &args)
    {
        if(args.size() != 1)
        {
            string errMsg = "Expected 1 argument for command removebind, got ";
            errMsg += to_string(args.size());
            errMsg += " argument(s)";
            addSystemMessage(errMsg);
            return;
        }
        
        string key = ":";
        key += args[0];
        key += ":";
        
        if(key.size() > 255)
        {
            // 253 = bind + two colons
            addSystemMessage("Bind is too long. Max size is 253 bytes");
            return;
        }
        
        bool bindRemoved = Chatbar::removeBind(key);
        if(bindRemoved)
            addSystemMessage("Bind removed");
        else
            addSystemMessage("Bind doesn't exist, nothing was removed");
    });
    
    Command::add("binds", [addSystemMessage](const vector<string> &args)
    {
        if(args.size() != 0)
        {
            string errMsg = "Expected 0 arguments for command removebind, got ";
            errMsg += to_string(args.size());
            errMsg += " argument(s)";
            addSystemMessage(errMsg);
            return;
        }
        
        string msg = "Binds:";
        auto binds = Chatbar::getBinds();
        for(auto &bind : binds)
        {
            msg += "\n";
            msg += bind.first;
            msg += " ";
            msg += bind.second;
        }
        addSystemMessage(msg);
    });
    
    // Change nick of current user in current channel
    Command::add("nick", [&loggedIn, &offlineChannel, addSystemMessage](const vector<string> &args)
    {
        if(args.size() != 1)
        {
            string errMsg = "Expected 1 argument for command nick, got ";
            errMsg += to_string(args.size());
            errMsg += " argument(s)";
            addSystemMessage(errMsg);
            return;
        }
        
        if(!loggedIn)
        {
            addSystemMessage("You need to be logged in to change your nickname");
            return;
        }
        
        if(Channel::getCurrent() == &offlineChannel)
        {
            addSystemMessage("You need to be in a channel to change your nickname");
            return;
        }
        
        if(args[0].size() == 0 || args[0].size() > 255)
        {
            addSystemMessage("Invalid nickname. Nickname has to be between 1 and 255 characters");
            return;
        }
        
        Channel::getCurrent()->changeNick(args[0]);
        string msg = "Your nickname was changed to ";
        msg += args[0];
        addSystemMessage(msg);
    });
    
    Command::add("clearcache", [&database](const vector<string> &args)
    {
        printf("Cleared cache (%d bytes)\n", database->clearCache());
    });
    
    sf::Clock frameTimer;
    
    while (window.isOpen())
    {
        frameTimer.restart();
        Channel *currentChannel =  Channel::getCurrent();
        
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
            else if(event.type == sf::Event::Resized)
            {
                sf::FloatRect viewRect(0.0f, 0.0f, event.size.width, event.size.height);
                /* // TODO: Use xlib to set window minimum size instead
                const int minWidth = 800;
                if(event.size.width < minWidth)
                {
                    viewRect.width = minWidth;
                    window.setSize(sf::Vector2u(minWidth, event.size.height));
                }
                */
                sf::View view(viewRect);
                window.setView(view);
            }
            else if(event.type == sf::Event::MouseEntered)
                window.setFramerateLimit(FRAMERATE_FOCUSED);
            //else if(event.type == sf::Event::MouseLeft)
            //    window.setFramerateLimit(FRAMERATE_NOT_FOCUSED);
            
            if(event.type == sf::Event::MouseEntered)
                focused = true;
            else if(event.type == sf::Event::MouseLeft)
                focused = false;
            
            if(focused)
            {
                ImagePreview::processEvent(event);
            }
            
            if(!ImagePreview::getPreviewContentPtr() && ImagePreview::getTimeSinceLastSeenMs() > 250)
            {
                GlobalContextMenu::processEvent(event);
                currentChannel->processEvent(event, cache);
            }
            
            lastFocusedTimer.restart();
        }

        if(lastFocusedTimer.getElapsedTime().asMilliseconds() > 3000)
        {
            this_thread::sleep_for(chrono::milliseconds(250));
            continue;
        }
        
        window.clear(ColorScheme::getBackgroundColor());
        ChannelSidePanel::draw(window);
        currentChannel->draw(window, cache);
        UsersSidePanel::draw(window, cache);
        ChannelTopPanel::draw(window);
        GlobalContextMenu::draw(window);
        ImagePreview::draw(window);
        
        if(waitingToJoin)
        {
            auto windowSize = window.getSize();
            
            sf::RectangleShape shadeRect(sf::Vector2f(windowSize.x, windowSize.y));
            shadeRect.setFillColor(sf::Color(0, 0, 0, 200));
            window.draw(shadeRect);
            
            const sf::Font *FONT = ResourceCache::getFont("fonts/Roboto-Regular.ttf");
            const float FONT_SIZE = (double)windowSize.x / 40.0;
            sf::Text text("Wait until you are added to the channel", *FONT, FONT_SIZE);
            text.setPosition(floor((float)windowSize.x * 0.5f - text.getLocalBounds().width * 0.5f), floor((float)windowSize.y * 0.5f - FONT->getLineSpacing(FONT_SIZE) * 0.5f));
            window.draw(text);
        }
        
        //video.draw(window);
        window.display();
    }

    return 0;
}