Remove the static handler

var path = require('path');

var fs = require('fs');

var winston = require('winston');

var DocumentHandler = require('./document_handler');

// For serving static assets

var StaticHandler = function(path, cacheAssets) {

  this.basePath = path;

  this.defaultPath = '/index.html';

  this.cacheAssets = cacheAssets;

  // Grab the list of available files - and move into hash for quick lookup

  var available = fs.readdirSync(this.basePath);

  this.availablePaths = {};

  for (var i = 0; i < available.length; i++) {

    this.availablePaths['/' + available[i]] = true;

  }

};

StaticHandler.cache = {};

// Determine the content type for a given extension

StaticHandler.contentTypeFor = function(ext) {

  if (ext == '.js') return 'text/javascript';

  else if (ext == '.css') return 'text/css';

  else if (ext == '.html') return 'text/html';

  else if (ext == '.ico') return 'image/ico';

  else if (ext == '.txt') return 'text/plain';

  else if (ext == '.png') return 'image/png';

  else {

    winston.error('unable to determine content type for static asset with extension: ' + ext);

    return 'text/plain';

  }

};

// Handle a request, and serve back the asset if it exists

StaticHandler.prototype.handle = function(incPath, response) {

  // If this is a potential key, show the index - otherwise

  // bust out a 404

  if (!this.availablePaths[incPath]) {

    if (incPath === '/' || DocumentHandler.potentialKey(incPath.substring(1))) {

      incPath = this.defaultPath;

    }

    else {

      winston.warn('failed to find static asset', { path: incPath });

      response.writeHead(404, { 'content-type': 'application/json' });

      response.end(JSON.stringify({ message: 'no such file' }));

      return;

    }

  }

  // And then stream the file back - either from the cache or from source

  var filePath = this.basePath + (incPath == '/' ? this.defaultPath : incPath);

  var cached = this.cacheAssets && this.isCached(filePath);

  // Go get'er

  var _this = this;

  var method = cached ? this.serveCached : this.retrieve;

  method(filePath, function(error, content) {

    // detect errors

    if (error) {

      winston.error('unable to read file', { path: filePath, error: error });

      response.writeHead(500, { 'content-type': 'application/json' });

      response.end(JSON.stringify({ message: 'IO: Unable to read file' }));

      // If it was cached, bust the cache

      if (cached) {

        StaticHandler.cache[filePath] = null;

      }

    }

    // Get the content

    else {

      var contentType = StaticHandler.contentTypeFor(path.extname(filePath));

      response.writeHead(200, { 'content-type': contentType });

      response.end(content, 'utf-8');

      // Stick it in the cache if its not in there

      if (!cached && _this.cacheAssets) {

        StaticHandler.cache[filePath] = content;

      }

    }

  }); 

};

// Retrieve from the file

StaticHandler.prototype.retrieve = function(filePath, callback) {

  var _this = this;

  winston.verbose('loading static asset', { path: filePath });

  fs.readFile(filePath, function(error, content) {

    callback(error, content);

  });

};

// Retrieve from memory cache

StaticHandler.prototype.serveCached = function(filePath, callback) {

  callback(undefined, StaticHandler.cache[filePath]);

};

// Determine if a given filePath is cached or not

StaticHandler.prototype.isCached = function(filePath) {

  return !!StaticHandler.cache[filePath];

};

module.exports = StaticHandler;