simple-custom-app.js

var express = require("express");
var app = express();
var _ = require("lodash");
var bodyParser = require("body-parser");
var resolve = require("path").resolve;
var fs = require("fs");

app.use(bodyParser.json());

var sendCsvFileAsIs = function (req, res) {
  res.sendFile(resolve("./data/" + req.body.source + ".csv"));
};

var sendFilteredJsonFile = function (req, res) {
  var data = require("./data/" + req.body.source + ".json");
  var companyFilter = req.body.filter["company"] || [];
  var price = req.body.filter["price"] || 0;
  if (!_.isEmpty(companyFilter)) {
    data = _.filter(data, function (row) {
      return _.includes(companyFilter, row.company);
    });
  }

  data = _.filter(data, function (row) {
    return row.price >= price;
  });

  res.json(data);
};

var dataProcessor = {
  flowers: sendCsvFileAsIs,
  salaries: sendCsvFileAsIs,
  stocks: sendFilteredJsonFile,
};

var getSources = function () {
  return [
    { id: "flowers", name: "Flowers" },
    { id: "salaries", name: "Salaries" },
    {
      id: "stocks",
      name: "Stocks",
      filter: [
        {
          id: "price",
          title: "Bottom Price",
          optional: true,
          type: "number",
        },
        {
          id: "company",
          title: "Companies",
          optional: true,
          placeholder: "Select companies",
          private: true,
          type: "multilist",
          data: [
            { title: "Apple", value: "AAPL" },
            { title: "Microsoft", value: "MSFT" },
            { title: "IBM", value: "IBM" },
            { title: "Amazon", value: "AMZN" },
          ],
        },
      ],
    },
  ];
};

app.get("/logo", function (req, res) {
  res.sendFile(resolve("./logo.svg"));
});

app.get("/", function (req, res) {
  var app = {
    name: "Vizydrop Samples",
    version: "2.0",
    description: "The set of samples to check vizydrop in action",
    authentication: [
      {
        id: "none",
        name: "This information is public",
        description:
          "There is no any authentication required. Just press [Connect] button and proceed to charts beauty",
      },
    ],
    sources: getSources(),
  };
  res.json(app);
});

app.post("/validate", function (req, res) {
  res.json({ name: "Vizydrop Samples" });
});

app.post("/", function (req, res) {
  dataProcessor[req.body.source](req, res);
});

app.listen(process.env.PORT || 8080);