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96 lines
1.9 KiB
96 lines
1.9 KiB
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/*!
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* Connect - favicon
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* Copyright(c) 2010 Sencha Inc.
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* Copyright(c) 2011 TJ Holowaychuk
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* MIT Licensed
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*/
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/**
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* Module dependencies.
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*/
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var crypto = require('crypto')
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, fs = require('fs');
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/**
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* Favicon cache.
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*/
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var icon;
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/**
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* Return md5 hash of the given string and optional encoding,
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* defaulting to hex.
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*
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* utils.md5('wahoo');
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* // => "e493298061761236c96b02ea6aa8a2ad"
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*
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* @param {String} str
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* @param {String} encoding
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* @return {String}
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* @api public
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*/
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exports.md5 = function (str, encoding) {
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return crypto
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.createHash('md5')
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.update(str)
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.digest(encoding || 'hex');
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};
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/**
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* By default serves the connect favicon, or the favicon
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* located by the given `path`.
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*
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* Options:
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*
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* - `maxAge` cache-control max-age directive, defaulting to 1 day
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*
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* Examples:
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*
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* connect.createServer(
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* connect.favicon()
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* );
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*
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* connect.createServer(
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* connect.favicon(__dirname + '/public/favicon.ico')
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* );
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*
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* @param {String} path
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* @param {Object} options
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* @return {Function}
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* @api public
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*/
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module.exports = function favicon(path, options) {
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var options = options || {}
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, path = path || __dirname + '/../public/favicon.ico'
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, maxAge = options.maxAge || 86400000;
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return function favicon(req, res, next) {
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if ('/favicon.ico' == req.url) {
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if (icon) {
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res.writeHead(200, icon.headers);
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res.end(icon.body);
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} else {
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fs.readFile(path, function (err, buf) {
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if (err) return next(err);
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icon = {
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headers: {
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'Content-Type': 'image/x-icon'
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, 'Content-Length': buf.length
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, 'ETag': '"' + exports.md5(buf) + '"'
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, 'Cache-Control': 'public, max-age=' + (maxAge / 1000)
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},
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body: buf
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};
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res.writeHead(200, icon.headers);
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res.end(icon.body);
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});
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}
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} else {
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next();
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}
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};
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};
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