Tic Tac Toe Squared Server

A server for the Tic Tac Toe Squared (AKA Meta Tic Tac Toe)

This is written in Go

Tech Stack:

• MySQL database to store game and user information
• Go server to interface with database and respond to requests
• (Another) Go server to handle authentication
• NGINX server to reverse proxy (so separate apps are separate processes)
• RESTful API as well as Websockets (to update when game changes)

API

URL | Function
--- | --------
GET /users/{UserID}/games | lists all games
GET /games/{GameID}/info | lists info on game with specified GameID
GET /games/{GameID}/board | gives board in JSON
GET /games/{GameID}/string | gives board in string format (use monospaced font)
GET /games/{GameID}/ws | gives websocket that emits on game changes and chats
POST /games?Player1={PID1}&Player2={PID2} | makes a new game with specified GameID's and returns the GameID of the game created
POST /games/{GameID}/move?Player={PID}&Box={BID}&Square={SID} | makes a move and responds with an error if unsucessful; broadcasts on ws if succesful 

Request Authorization

Header | Value
------ | --------
HMAC | encoded HMAC with SHA 256
Encoding | encoding format for HMAC (if not provided, defaults to hex) 
Time-Sent | seconds since epoch (fails if more than 10 seconds away from time received)

The HMAC uses (seconds in epoch):(path including initial / and without the T9) as the message and the login secret (in base 64 parsed as a string) as a secret.

####Example:

I want to get all the games for user 54689, which is at https://www.marktai.com/T9/users/54689/games

• Secret = "G7lc+B73JZnRQAYL0h15b4MvMZADllCleJtdJApSBJrq9x9kTm94FdOhnd31LttH995jbYeH7h5qP1W8WO1zng=="
• Path = /users/54689/games
• Time-Sent = 1472274995

This results in "1472274995:/users/54689/games" as the message, and the secret is "G7lc+B73JZnRQAYL0h15b4MvMZADllCleJtdJApSBJrq9x9kTm94FdOhnd31LttH995jbYeH7h5qP1W8WO1zng=="

Therefore, the HMAC is "7a2dc3e1fff05531a2a853c08e10878382e346b4793649e01ea37373d564b3b9", verifiable at http://www.freeformatter.com/hmac-generator.html

Class Organization

• Game
  • Board (all 81 squares)
    • Box (9 squares)
      • Square (stored as uint)
  • MoveHistory
• DbGame - Game converts to dbgame before accessing database. dbgame also converts to Game