routes/problems.js

   1 // AJAX methods to get, create, update or delete a problem
   2
   3 let router = require("express").Router();
   4 const access = require("../utils/access");
   5 const ProblemModel = require("../models/Problem");
   6 const sanitizeHtml = require('sanitize-html');
   7 const MaxNbProblems = 20;
   8
   9 function sanitizeUserInput(fen, instructions, solution)
  10 {
  11     if (!fen.match(/^[a-zA-Z0-9, /-]*$/))
  12         return "Bad characters in FEN string";
  13     instructions = sanitizeHtml(instructions);
  14     solution = sanitizeHtml(solution);
  15     if (instructions.length == 0)
  16         return "Empty instructions";
  17     if (solution.length == 0)
  18         return "Empty solution";
  19     return {
  20         fen: fen,
  21         instructions: instructions,
  22         solution: solution
  23     };
  24 }
  25
  26 // Get one problem (TODO: vid unused, here for URL de-ambiguification)
  27 router.get("/problems/:vid([0-9]+)/:id([0-9]+)", access.ajax, (req,res) => {
  28     const pid = req.params["id"];
  29     ProblemModel.getOne(pid, (err,problem) => {
  30         if (!!err)
  31             return res.json(err);
  32         return res.json({problem: problem});
  33     });
  34 });
  35
  36 // Fetch N previous or next problems
  37 router.get("/problems/:vid([0-9]+)", access.ajax, (req,res) => {
  38     const vid = req.params["vid"];
  39     const directionStr = (req.query.direction == "forward" ? ">" : "<");
  40     const lastDt = req.query.last_dt;
  41     const type = req.query.type;
  42     if (!lastDt.match(/[0-9]+/))
  43         return res.json({errmsg: "Bad timestamp"});
  44     if (!["others","mine"].includes(type))
  45         return res.json({errmsg: "Bad type"});
  46     ProblemModel.fetchN(vid, req.userId, type, directionStr, lastDt, MaxNbProblems,
  47         (err,problems) => {
  48             if (!!err)
  49                 return res.json(err);
  50             return res.json({problems: problems});
  51         }
  52     );
  53 });
  54
  55 // Upload a problem (sanitize inputs)
  56 router.post("/problems/:vid([0-9]+)", access.logged, access.ajax, (req,res) => {
  57     const vid = req.params["vid"];
  58     const s = sanitizeUserInput(req.body["fen"], req.body["instructions"], req.body["solution"]);
  59     if (typeof s === "string")
  60         return res.json({errmsg: s});
  61   ProblemModel.create(vid, s.fen, s.instructions, s.solution);
  62     res.json({});
  63 });
  64
  65 // Update a problem (also sanitize inputs)
  66 router.put("/problems/:id([0-9]+)", access.logged, access.ajax, (req,res) => {
  67     const pid = req.params["id"]; //problem ID
  68     const s = sanitizeUserInput(req.body["fen"], req.body["instructions"], req.body["solution"]);
  69     if (typeof s === "string")
  70         return res.json({errmsg: s});
  71     ProblemModel.update(pid, req.userId, fen, instructions, solution);
  72     res.json({});
  73 });
  74
  75 // Delete a problem
  76 router.delete("/problems/:id([0-9]+)", access.logged, access.ajax, (req,res) => {
  77     const pid = req.params["id"]; //problem ID
  78   ProblemModel.delete(pid, req.userId);
  79     res.json({});
  80 });
  81
  82 module.exports = router;