opt-cc/api/routes/signatures.js

'use strict';

// modules
const fs = require('fs');
const express = require('express');

// HTTP status codes by name
const codes = require('./http-codes');

const routerHandling = require('../middleware/router-handling');

const UserModel = require('../models/user');

const signatures = new express.Router();

// routes **********************
signatures.route('/:id')
          // does not use idValidator since it works by username
          .get((req, res, next) => {
            // decode UTF8-escape sequences (special characters)
            const uri = decodeURIComponent(req.params.id);
            UserModel.findOne({username: uri}, (err, user) => {
              const emptyFile = 'resource/signature/0.png';
              if (user === null) {
                res.sendFile(emptyFile, {root: __dirname + '/../'});
              } else {
                const file = 'resource/signature/' + user._id + '.png';

                fs.stat(__dirname + '/../' + file, (err, stat) => {
                  if (err === null) {
                    res.sendFile(file, {root: __dirname + '/../'});
                  } else if (err.code === 'ENOENT') {
                    res.sendFile(emptyFile, {root: __dirname + '/../'});
                  } else {
                    err = new Error('Internal server error');
                    err.status = codes.servererror;
                    return next(err);
                  }
                });
              }
            });
          })

          .all(
            routerHandling.httpMethodNotAllowed
          );


// this middleware function can be used, if you like or remove it
// it looks for object(s) in res.locals.items and if they exist, they are send to the client as json
signatures.use(routerHandling.emptyResponse);


module.exports = signatures;