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node_modules/serve-favicon/index.js

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+/*!
+ * serve-favicon
+ * Copyright(c) 2010 Sencha Inc.
+ * Copyright(c) 2011 TJ Holowaychuk
+ * Copyright(c) 2014 Douglas Christopher Wilson
+ * MIT Licensed
+ */
+
+/**
+ * Module dependencies.
+ * @private
+ */
+
+var etag = require('etag');
+var fresh = require('fresh');
+var fs = require('fs');
+var ms = require('ms');
+var parseUrl = require('parseurl');
+var path = require('path');
+var resolve = path.resolve;
+
+/**
+ * Module variables.
+ * @private
+ */
+
+var maxMaxAge = 60 * 60 * 24 * 365 * 1000; // 1 year
+
+/**
+ * Serves the favicon located by the given `path`.
+ *
+ * @public
+ * @param {String|Buffer} path
+ * @param {Object} options
+ * @return {Function} middleware
+ */
+
+module.exports = function favicon(path, options){
+  options = options || {};
+
+  var buf;
+  var icon; // favicon cache
+  var maxAge = calcMaxAge(options.maxAge);
+  var stat;
+
+  if (!path) throw new TypeError('path to favicon.ico is required');
+
+  if (Buffer.isBuffer(path)) {
+    buf = new Buffer(path.length);
+    path.copy(buf);
+
+    icon = createIcon(buf, maxAge);
+  } else if (typeof path === 'string') {
+    path = resolve(path);
+    stat = fs.statSync(path);
+    if (stat.isDirectory()) throw createIsDirError(path);
+  } else {
+    throw new TypeError('path to favicon.ico must be string or buffer');
+  }
+
+  return function favicon(req, res, next){
+    if (parseUrl(req).pathname !== '/favicon.ico') {
+      next();
+      return;
+    }
+
+    if ('GET' !== req.method && 'HEAD' !== req.method) {
+      var status = 'OPTIONS' === req.method ? 200 : 405;
+      res.writeHead(status, {'Allow': 'GET, HEAD, OPTIONS'});
+      res.end();
+      return;
+    }
+
+    if (icon) return send(req, res, icon);
+
+    fs.readFile(path, function(err, buf){
+      if (err) return next(err);
+      icon = createIcon(buf, maxAge);
+      send(req, res, icon);
+    });
+  };
+};
+
+/**
+ * Calculate the max-age from a configured value.
+ *
+ * @private
+ * @param {string|number} val
+ * @return {number}
+ */
+
+function calcMaxAge(val) {
+  var num = typeof val === 'string'
+    ? ms(val)
+    : val;
+
+  return num != null
+    ? Math.min(Math.max(0, num), maxMaxAge)
+    : maxMaxAge
+}
+
+/**
+ * Create icon data from Buffer and max-age.
+ *
+ * @private
+ * @param {Buffer} buf
+ * @param {number} maxAge
+ * @return {object}
+ */
+
+function createIcon(buf, maxAge) {
+  return {
+    body: buf,
+    headers: {
+      'Cache-Control': 'public, max-age=' + ~~(maxAge / 1000),
+      'ETag': etag(buf)
+    }
+  };
+}
+
+/**
+ * Create EISDIR error.
+ *
+ * @private
+ * @param {string} path
+ * @return {Error}
+ */
+
+function createIsDirError(path) {
+  var error = new Error('EISDIR, illegal operation on directory \'' + path + '\'');
+  error.code = 'EISDIR';
+  error.errno = 28;
+  error.path = path;
+  error.syscall = 'open';
+  return error;
+}
+
+/**
+ * Send icon data in response to a request.
+ *
+ * @private
+ * @param {IncomingMessage} req
+ * @param {OutgoingMessage} res
+ * @param {object} icon
+ */
+
+function send(req, res, icon) {
+  var headers = icon.headers;
+
+  // Set headers
+  var keys = Object.keys(headers);
+  for (var i = 0; i < keys.length; i++) {
+    var key = keys[i];
+    res.setHeader(key, headers[key]);
+  }
+
+  if (fresh(req.headers, res._headers)) {
+    res.statusCode = 304;
+    res.end();
+    return;
+  }
+
+  res.statusCode = 200;
+  res.setHeader('Content-Length', icon.body.length);
+  res.setHeader('Content-Type', 'image/x-icon');
+  res.end(icon.body);
+}