Add API document

docs/api.md

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+MOTHv3 API
+==========
+
+MOTH, by design, uses a small number of API endpoints.
+
+Whenever possible,
+we decided to push complexity into the client,
+keeping the server as simple as we could make it.
+After all,
+this is a hacking contest.
+If a participant finds a vulnerability in code running on their own machine,
+the people running the server don't care.
+
+Specification
+=============
+
+You make requests as HTTP GET query arguments:
+
+    https://server/path/to/endpoint?var1=val1&var2=val2
+
+The server returns a
+[JSend](https://labs.omniti.com/labs/jsend) response:
+
+    {
+      status: "success",
+      data: "Any JS data type here"
+    }
+
+
+Client State
+============
+
+The client (or user interacting with the client) needs to remember only one thing:
+
+* teamId: the team ID used to register
+
+A naive client,
+like the one we used from 2009-2018,
+can ask the user to type in the team ID for every submission.
+This is fine.
+
+
+Endpoints
+=========
+
+RegisterTeam(teamId, teamName)
+-------------------------------
+
+Register a team name with a team hash.
+
+Parameters:
+
+* teamId: Team's unique identifier (usually a hex value)
+* teamName: Team's human-readable name
+
+On success, no data is returned.
+On failure, message contains an English explanation of why.
+
+Example:
+
+    https://server/RegisterTeam?teamId=8b1292ca
+
+    {
+      status: "success",
+      data: nil
+    }
+
+
+GetPuzzleList()
+---------------
+
+Return all currently-open puzzles.
+
+Return data:
+
+* puzzles: dictionary mapping from category to a list of point values.
+
+
+Example:
+
+    https://server/GetPuzzleList
+
+    {
+      status: "success",
+      data: {
+        "puzzles": {
+          "sequence": [1, 2],
+          "codebreaking": [10],
+        }
+      }
+    }
+
+
+### GetPuzzle(category, points)
+
+Return a puzzle.
+
+Return data:
+
+* authors: List of puzzle authors
+* hashes: list of djbhash values of acceptable answers
+* files: dictionary of puzzle-associated filenames and their URLs
+* body: HTML body of the puzzle
+
+
+Example:
+
+    https://server/GetPuzzle?category=sequence&points=1
+
+    {
+      status: "success",
+      data: {
+        "authors": ["neale"],
+        "hashes": [177627],
+        "files": {
+          "happy.png": "https://cdn/assets/0904cf3a437a348bea2c49d56a3087c26a01a63c.png"
+        },
+        "body": "<pre><code>1 2 3 4 5 _\n</code></pre>\n"
+    }
+
+
+### GetPointsLog()
+
+Return the entire points log, and team names.
+
+Return data:
+
+* teams: mapping from team number (int) to team name
+* log: list of (timestamp, team number, category, points)
+
+Note: team number may change between calls.
+
+
+Example:
+
+    https://server/GetEventsLog
+
+    {
+      status: "success",
+      data: {
+        teams: {
+          0: "Zelda",
+          1: "Defender"
+        },
+        log: [
+          [1526478368, 0, "sequence", 1],
+          [1526478524, 1, "sequence", 1],
+          [1526478536, 0, "nocode", 1]
+        ]
+      }
+    }
+
+
+### SubmitAnswer(teamId, category, points, answer)
+
+Submit an answer to a puzzle.
+
+Example:
+
+    https://server/SubmitAnswer?teamId=8b1292ca&category=sequence&points=1&answer=6
+
+    {
+      status: "success",
+      data: null
+    }
+
+### SubmitToken(teamId, token)
+
+Submit a token for points
+
+Return data:
+
+* category: category for which this token awarded points
+* points: number of points awarded
+
+
+Example:
+
+    https://server/SubmitToken?teamId=8b1292ca&token=wat:30:xylep-radar-nanox
+
+    {
+      status: "success",
+      data: {
+        category: "wat",
+        points: 30
+      }
+    }