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utils.js
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utils.js
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'use strict';
var fs = require('fs');
var path = require('path');
var extend = require('soak').mixin;
var inherit = require('soak').inherit;
var metrics = require('./metrics');
var undefsafe = require('undefsafe');
var EventEmitter = require('events').EventEmitter;
module.exports = {
// Create a base observable object that inherits from EventEmitter. This
// allows us to create new objects that can trigger events very easily.
//
// Example:
//
// var Store = Observable.extend({
// save: function () {}
// });
Observable: inherit(EventEmitter),
// Helper function for creating an index file in a directory. It loads all
// modules within the provided directory excluding the file provided as
// "indexpath". These will then be returned.
//
// Example:
//
// module.exports = utils.index(__dirname, __filename);
index: function (dirname, indexpath) {
var extensions = {js: 1},
modules = {};
indexpath = indexpath || path.join(dirname, 'index.js');
// Load all exported objects into a single module.
fs.readdirSync(dirname).forEach(function (filename) {
var fullpath = path.join(dirname, filename),
parts = filename.split('.'),
module, name;
if (fullpath !== indexpath && extensions[parts.pop()] && '.' !== filename[0]) {
name = parts.join('.');
module = require(fullpath);
// Grab the function name or module name if possible.
if (typeof module.name === 'string') {
name = module.name;
}
modules[name] = module;
}
});
return modules;
},
// Takes an object and a series of method names. Each method will be
// re-assigned to the object with the object bound as the methods scope. This
// is generally useful for defining callback methods.
//
// An array of method names can also be passed.
//
// Example:
//
// object = {onData: function () {}, onEnd: function () {});
// utils.bindAll(object, 'onData', 'onEnd');
//
// // Same as doing.
// object.onData = object.onData.bind(object);
// object.onEnd = object.onEnd.bind(object);
bindAll: function (object /* args */) {
var methods = [].slice.call(arguments, 1);
if (arguments.length === 2 && Array.isArray(arguments[1])) {
methods = arguments[1];
}
methods.forEach(function (method) {
if (typeof object[method] === 'function') {
object[method] = object[method].bind(object);
}
});
return object;
},
// Takes a namespace string, and object and a series of method names.
//
// When each method is called that will be incrememented in the metrics
// using the namespace and the method name.
//
// An array of method names can also be passed.
//
// Example:
//
// object = {onData: function () {}, onEnd: function () {});
// utils.bindMetrics('object', object, 'onData', 'onEnd');
//
bindMetrics: function (namespace, object /* args */) {
var methods = [].slice.call(arguments, 2);
if (arguments.length === 3 && Array.isArray(arguments[2])) {
methods = arguments[2];
}
methods.forEach(function (method) {
if (typeof object[method] === 'function' && method !== 'constructor') {
var original = object[method];
object[method] = function () {
metrics.increment(namespace + '.method.' + method);
original.apply(object, [].slice.call(arguments));
};
}
});
return object;
},
// Extends the first argument with the properties of the subsequent
// arguments.
extend: extend,
// Simplifies the process of extending existing objects.
inherit: inherit,
extract: function (obj /* keys */) {
var keys = [].slice.call(arguments, 1),
collected = {};
keys.forEach(function (key) {
if (obj[key]) {
collected[key] = obj[key];
}
});
return collected;
},
isAjax: function (req) {
return (req.get('X-Requested-With') || '').toLowerCase() === 'xmlhttprequest' || (req.accepted[0] && req.accepted[0].value === 'application/json');
},
shortcode: function (length) {
var vowels = 'aeiou',
consonants = 'bcdfghjklmnpqrstvwxyz',
word = '', index = 0, set;
if (length === undefined) {
length = 3;
}
for (; index < length; index += 1) {
set = (index % 2 === 0) ? consonants : vowels;
word += set[Math.floor(Math.random() * set.length)];
}
return word;
},
re: {
flatten: /\s+/g,
body: /<body.*?>\s*(.*)/m,
meta: /<meta name="description" content="(.*?)"/,
tags: /<[^>]+>/g,
title: /<title>(.*)<\/title>/
},
titleForBin: function (bin) {
var html = (bin.html || '').replace(this.re.flatten, ' '), // flatten
javascript = (bin.javascript || '').replace(this.re.flatten, ' ').trim(),
css = (bin.css || '').replace(this.re.flatten, ' ').trim(),
matches = (html.match(this.re.meta) || []);
// try to return the meta[description] first
if (matches.length === 2 && matches[1].trim()) {
return matches[1];
}
// then some of the body content with tags stripped
matches = (html.match(this.re.body) || ['', ''])[1].replace(this.re.tags, '').trim();
if (matches) {
return matches;
}
// No title return JavaScript.
if (javascript) {
return javascript;
}
if (css) {
return css;
}
matches = (html.match(this.re.title) || []);
if (matches.length === 2 && matches[1].trim()) {
return matches[1];
}
return html.replace(this.re.tags, '').trim();
},
since: function (date) {
var diff = (+new Date() - date) / 1000,
message = 'a long time',
timespan;
try {
// make "Thu Jan 10 2013 16:32:37 GMT+0000 (GMT)" into "10 Jan 2013"
var parts = date.toString().split(' ').slice(1,4);
message = parts.slice(2).concat(parts.slice(0,2)).reverse().join(' ');
} catch(e) {}
if (diff < 60) {
timespan = Math.floor(diff);
message = '{timespan} second';
}
else if (diff < 3600) {
timespan = Math.floor(diff / 60);
message = '{timespan} minute';
}
else if (diff < 86400) {
timespan = Math.floor(diff / 3600);
message = '{timespan} hour';
}
else if (diff < 604800) {
timespan = Math.floor(diff / 86400);
message = '{timespan} day';
}
else if (diff < 2419200) {
timespan = Math.ceil(diff / 604800);
message = '{timespan} week';
}
else if (diff < 29030400) {
timespan = Math.floor(diff / 2419200);
message = '{timespan} month';
}
if (timespan) {
if (timespan !== 1) {
message += 's';
}
return message.replace('{timespan}', timespan) + ' ago';
} else {
return message;
}
},
queryStringForBin: function (bin) {
var params = [];
['html', 'javascript', 'css'].forEach(function (key) {
if (bin[key]) {
params.push(key);
}
});
params.push('live');
return params.join(',');
},
cleanForRender: function (str) {
var cache = {
'\u2028': '
',
'\u2029': '
'
};
var re, bad;
for (bad in cache) {
if (str.indexOf(bad) !== -1) {
re = new RegExp(bad, 'g');
str = str.replace(re, cache[bad]);
}
}
return str;
},
binUrlLength: function (req) {
return undefsafe(req, 'session.user') ? 2 : 9;
},
};