Wu, Qingjun

		Sham Prasad PS

		Padhy, Umakant

##Title: WeChat like system

##Summary: WeChat is an Instant Messenger like WhatsApp, it is very popular especially in Chinese community. It is a combination of Instant Message and Social Network. This system will include both UI and backend.

##Functionality:

1. User Registration: register a new user;

2. User Login/Log out;

3. Add/Remove/block/unblock contacts (friends);

4. Send/Receive Message;

5. Create/Delete/Join/Quit group chatting;

6. Send/Receive message in group chat;

7. Moments board: this is significant feature that makes WeChat different from traditional IM and similar to social media like Facebook/Twitter;

8. OpenID identity provider API; This is like other social network Facebook/Google+/Twitter, whose account can be used to register/login other websites.

Key Technologies/Components of the system:

1. Message/post type: text, audio, video;

2. Backend Database will maintain contact list of user/group;

3. System will maintain IP/Port address of the user;

4. User can send message directly to another user using UDP protocol; it doesn’t need server to dispatch it;

5. When user sends a message, a message will be sent to the server – this is the way the system keeps track of chat history;

6. Privacy: a friend of mine is not my friend if we’re not explicitly connected; My post in Moments board can be seen by my contact, by cannot be seen by friends of my contact if we’re not connected;

7. Message is ordered: when a user is sending two messages to another, these two message should arrive in order;