r.js

var path = require('path');
var express = require('express');
var nunjucks = require('nunjucks');
var logger = require('bunyan').createLogger({ name: 'mdz:web' });

module.exports = function (redisClient, config, development) {
  'use strict';

  var HOST = process.env.FRONT_HOST || 'meduza.io';
  var DEST_ROOT = development ? config.DEV_DEST_ROOT : config.DIST_DEST_ROOT;

  var web = express.Router();

  nunjucks.configure(path.join(__dirname, '../..', DEST_ROOT), {
    tags: {
      blockStart: '<%',
      blockEnd: '%>',
      variableStart: '%%',
      variableEnd: '%%',
      commentStart: '<#',
      commentEnd: '#>'
    }
  });

  web.get('*', function (req, res, next) {
    res.redisURLKey = config.REDIS_KEY + req.url.slice(1);

    logger.info(req.url);

    next();
  });

  web.get(['/feed/*', '/rss/*'], function (req, res, next) {
    res.set({ 'Content-Type': 'application/rss+xml; charset=ISO-8859-1' });

    res.onError = function (res) {
      res.status(404).send('');
    };

    next();
  });

  web.get('/jsonfeed/mailru/all', function (req, res, next) {
    res.set({ 'Content-Type': 'application/json' });

    res.onError = function (res) {
      res.status(404).send(JSON.stringify({ error: 'Not found' }));
    };

    next();
  });

  web.get('/sitemap/google/news.xml', function (req, res, next) {
    res.set({ 'Content-Type': 'application/xml' });

    res.onError = function (res) {
      res.status(404).send('');
    };

    next();
  });

  web.get('/readability/check/*', function (req, res) {
    res.set({ 'Content-Type': 'application/json' });

    redisClient.get(res.redisURLKey, function (err, data) {
      if (err || !data) {
        data = { 'is_readable': false };
      }

      res.send(data);
    });
  });

  web.get('/readability/*', function (req, res, next) {
    res.set({ 'Content-Type': 'application/json' });

    res.onError = function (res) {
      res.status(404).send(JSON.stringify({ error: 'Not found' }));
    };

    next();
  });

  web.get([
    '/feed/*',
    '/rss/*',
    '/jsonfeed/mailru/all',
    '/sitemap/google/news.xml',
    '/readability/check/*',
    '/readability/*'
  ], function (req, res) {
    redisClient.get(res.redisURLKey, function (err, data) {
      if (err || !data) {
        logger.warn({
          error: {
            key: res.redisURLKey,
            msg: err
          }
        }, req.url);

        if (res.onError) {
          res.onError(res);
        } else {
          res.status(404).send('404');
        }
        return;
      }

      res.send(data);
    });
  });

  // Check `wtf` param in query string
  // if presence then fetch og tags
  // and pass them for next middleware
  web.get('/live/*', function (req, res, next) {
    // 19061
    if (!req.param('wtf')) {
      next();
      return;
    }

    var key = config.REDIS_KEY + 'wtf/og/' + req.param('wtf');

    redisClient.get(key, function (err, data) {
      if (err || !data) {
        logger.warn({
          error: {
            key: key, msg: err
          }
        }, req.url);
        next();
        return;
      }

      res.wtfOG = JSON.parse(data);

      next();
    });
  });

  web.get([
    /\/news\/\w+/,
    /\/feature\/\w+/,
    /\/shapito\/\w+/,
    /\/fun\/\w+/,
    /\/galleries\/\w+/,
    /\/cards\/\w+/,
    /\/quiz\/\w+/,
    /\/live\/\w+/
  ], function (req, res) {
    var key = config.REDIS_KEY + 'api/' + config.API_VERSION + req.url;

    redisClient.get(key, function (err, data) {
      if (err || !data) {
        logger.warn({
          error: {
            key: key,
            msg: err
          }
        }, req.url);
        res.status(404).send('404');
        return;
      }

      var json = JSON.parse(data);
      var context = {
        title: json.root.title
      };

      nunjucks.render('index.html', context, function (err, data) {
        if (err) {
          logger.warn({
            error: {
              url: req.url,
              msg: err
            }
          }, 'Render view error');
          res.status(503).send('503');
          return;
        }

        res.send(data);
      });
    });
  });

  web.get('/fun', function (req, res) {
    res.set({ 'Location': 'https://' + HOST + '/shapito' });
    res.status(301).send('');
  });

  web.get([
    '/',
    '/cards',
    '/articles',
    '/shapito'
  ], function (req, res) {
    var context = {
      title: 'Meduza'
    };

    nunjucks.render('index.html', context, function (err, data) {
      if (err) {
        logger.warn({
          error: {
            url: req.url,
            msg: err
          }
        }, 'Render view error');
        res.status(503).send('503');
        return;
      }

      res.send(data);
    });
  });

  web.get('*', function (req, res) {
    logger.warn({
      error: {
        url: req.url
      }
    }, 'Unknown route');
    res.status(404).send('404');
  });

  return web;
};