node-img-placeholder/lib/app.js

run a local image placeholder service

module.exports = function(config) {
  var extend = require("extend");
  var express = require("express");
  var app = express();
  var imageService = require("./services/image-service");

  app.all("/*", function(req, res, next) {
    res.header("Access-Control-Allow-Origin", "*");
    res.header("Access-Control-Allow-Headers", "X-Requested-With");
    next();
  });

  app.get("/" + config.namespace + "/:dimension.:contentType", function(
    req,
    res,
    next
  ) {
    var p = req.params;
    var q = req.query;
    var _config = extend({}, config, {
      txtsize: q.txtsize,
      txtclr: q.txtclr,
      bg: q.bg,
      width: parseInt(p.dimension.split("x")[0], 10),
      height: parseInt(p.dimension.split("x")[1], 10),
      txt: q.txt,
      delay: q.delay,
      contentType: p.contentType,
      maxAge: q.maxAge,
      expiryDate: q.expiryDate
    });
    imageService.createImage(_config, function(err, image) {
      if (err) {
        return console.log(err);
      }
      res.setHeader("Content-Type", "image/" + _config.contentType);
      res.setHeader("Cache-Control", "public, max-age=" + _config.maxAge);
      res.setHeader("Expires", _config.expiryDate);
      res.setHeader("Last-Modified", _config.expiryDate);
      if (_config.delay) {
        setTimeout(function() {
          res.send(image);
        }, _config.delay);
      } else {
        res.send(image);
      }
    });
  });

  return app;
};