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server.js
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server.js
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const express = require("express");
const bodyParser = require("body-parser");
const path = require("path");
const app = express();
const sudoku = require("sudoku-umd");
// Required for CRA deployment
app.use(express.static(path.join(__dirname, "build")));
/**
* bodyParser middleware automatically parses the request body of POSTs and places
* the result in request.body of each route. (Assumes Content-Type: application/json is sent.)
*/
app.use(bodyParser.json());
app.get("/g/:sudokuGame", function(req, res) {
console.log(req.params.sudokuGame);
console.log({ res });
res.redirect("/bar");
});
app.get("/sudoku", (request, response, next) => {
const validDifficultyLevels = ["easy", "medium", "hard", "very-hard", "insane", "inhuman"];
const { difficulty } = request.query;
if (!validDifficultyLevels.includes(difficulty)) {
throw new Error(`Invalid difficulty level provided. Received '${difficulty}'`);
}
const sudokuPuzzle = sudoku.generate(difficulty);
const normalizedSudoku = normalizeSudoku(sudokuPuzzle);
response.json(normalizedSudoku);
});
app.post("/sudoku", (request, response) => {
// TODO: error handling for malformed requests
const unsolvedSudoku = denormalizeSudoku(request.body.unsolvedSudoku);
const solvedSudoku = sudoku.solve(unsolvedSudoku);
response.json(normalizeSudoku(solvedSudoku));
});
app.get("/", function(req, res) {
res.sendFile(path.join(__dirname, "build", "index.html"));
});
// PaaS places (e.g. Heroku, AWS) will use process.env.PORT when deploying, which is why it's here.
app.listen(process.env.PORT || 4000);
/**
*
* string to array of strings
*/
function normalizeSudoku(sudoku) {
const normalizedSudoku = [...sudoku].map(val => {
if (val === ".") {
return "";
}
return val;
});
return normalizedSudoku;
}
/**
*
* array of strings to string
*/
function denormalizeSudoku(sudoku) {
const denormalizedSudoku = sudoku
.map(val => {
if (val === "") {
return ".";
}
return val;
})
.join("");
return denormalizedSudoku;
}