// Creates mainUser and goes to convo screen
void signInToServerResponse(object sender, EventArgs e)
{
int messageIndex = serverConnection.unreadMessages.Count - 1;
if (messageIndex < 0)
{
return;
}
JObject message = JObject.Parse(serverConnection.unreadMessages[messageIndex]);
string type = serverConnection.interpretMessageType(message);
if (type == "signedIn")
{
User newUser = new User();
newUser.username = message[type]["username"].ToString();
newUser.email = message[type]["email"].ToString();
newUser.user_id = message[type]["id"].ToString();
newUser.pubKey = message[type]["pubKey"].ToString();
// Load storage. If not same user, reset
loadChatsAndUsersFromStorage();
if (mainUser == null || newUser.user_id != mainUser.user_id)
{
// Deletes all storage
SecureStorageHelper ssHelper = new SecureStorageHelper();
ssHelper.RemoveAllItems();
// Loads new users and resets memory of users&chats
mainUser = newUser;
otherUsers = new Dictionary <string, User> {
}; // username:user
usernameIdMatches = new Dictionary <string, string> {
}; //user_id:username
myChats = new Dictionary <string, Chat> {
}; // chatname:chat
chatNameMatches = new Dictionary <string, string> {
}; // chat_id:chatname
// Creates a new public key and updates server
AsymmetricKeyHelper akh = new AsymmetricKeyHelper(myAsymKeyPairAlias + mainUser.username);
akh.CreateKey();
string pubKey = akh.GetSharablePublicKey();
updatePubKey(pubKey);
}
// Post sign-in activities
getAllUsers();
getMyChats();
}
if (type == "noAccount")
{
RunOnUiThread(() =>
{
createAccountScreen();
});
}
}
void createUser(string username)
{
AsymmetricKeyHelper akh = new AsymmetricKeyHelper(myAsymKeyPairAlias + username);
akh.CreateKey();
string pubKey = akh.GetSharablePublicKey();
string message = "{\"access_id\": \"" + this.access_id + "\", \"username\": \"" + username + "\", \"pubKey\": \"" + pubKey + "\"}";
serverConnection.WriteMessage("createUser", message);
}
void inviteUsersToChat(string chatName, string username)
{
string chatId = myChats[chatName].chatId;
string joinerId = otherUsers[username].user_id;
string joinerPubKey = otherUsers[username].pubKey;
string symKeyEncrypted = myChats[chatName].getSharableKey();
// User's pub key is used to encrypt symmetric key
AsymmetricKeyHelper asymKeyHelper = new AsymmetricKeyHelper("otherUserKey");
symKeyEncrypted = asymKeyHelper.EncryptWithAnotherPublicKey(symKeyEncrypted, joinerPubKey);
string message = "{\"access_id\": \"" + this.access_id + "\", \"chatId\": \"" + chatId + "\", \"symKey\": \"" + symKeyEncrypted + "\", \"joinerId\": \"" + joinerId + "\"}";
serverConnection.WriteMessage("allowUserToJoinChat", message);
}
// Adds newly created chat to our list
void proccessNewChat(object sender, EventArgs e)
{
int messageIndex = serverConnection.unreadMessages.Count - 1;
if (messageIndex < 0)
{
return;
}
JObject message = JObject.Parse(serverConnection.unreadMessages[messageIndex]);
string type = serverConnection.interpretMessageType(message);
if (type == "chatCreated")
{
// Add new chat to our list
Chat aChat = new Chat(message[type].ToString());
// Creates sym key
aChat.createSymKey();
myChats[aChat.chatName] = aChat;
chatNameMatches[aChat.chatId] = aChat.chatName;
// Invite Users
string[] usersToInvite = FindViewById <EditText>(Resource.Id.chatInvites).Text.Split(',');
for (int i = 0; i < usersToInvite.Length; i++)
{
if (usersToInvite[i] == "")
{
continue;
}
inviteUsersToChat(aChat.chatName, usersToInvite[i]);
}
RunOnUiThread(() =>
{
convoScreen();
});
}
if (type == "acceptedToChat")
{
Chat aChat = new Chat(message[type].ToString());
string givenSymKey = message[type]["symKey"].ToString();
// Decrypts encrypted symkey
AsymmetricKeyHelper asymKeyHelper = new AsymmetricKeyHelper(myAsymKeyPairAlias + mainUser.username);
var symKey = asymKeyHelper.DecryptDataFromString(givenSymKey);
aChat.loadChatKey(symKey);
myChats[aChat.chatName] = aChat;
chatNameMatches[aChat.chatId] = aChat.chatName;
getNewMessages(aChat);
if (currentView == "convoScreen")
{
RunOnUiThread(() =>
{
convoScreen();
});
}
}
}
