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| 'use strict';
var _ = require('underscore'),
Class = require('class.extend'),
CONTENT_TYPE_JSON = 'application/json;charset=UTF-8',
CONTENT_TYPE_JSONP = 'text/javascript;charset=UTF-8',
CONTENT_TYPE_RSS = 'application/rss+xml',
CONTENT_TYPE_HTML = 'text/html;charset=UTF-8';
module.exports = Class.extend({
init: function() {
this._headers = {};
this._status = 200;
this._body = {};
this._isJSONPSupported = false;
this._cacheDurationSeconds = 0;
this.contentType(CONTENT_TYPE_JSON);
},
status: function(status) {
this._status = status;
return this;
},
header: function(key, value) {
this._headers[key] = value;
return this;
},
body: function(o) {
this._body = o;
return this;
},
contentType: function(type) {
return this.header('Content-Type', type);
},
allowCORS: function(origin) {
return this.header('Access-Control-Allow-Origin', origin || '*');
},
supportJSONP: function(jsonpCallbackQueryParamName) {
this._isJSONPSupported = true;
this._jsonpQueryParamName = jsonpCallbackQueryParamName;
return this;
},
cacheForSeconds: function(s) {
this._cacheDurationSeconds = Math.max(0, s);
return this;
},
cacheForMinutes: function(m) {
return this.cacheForSeconds(m * 60);
},
cacheForHours: function(h) {
return this.cacheForMinutes(h * 60);
},
redirect: function(url, isPermanent) {
this.status(isPermanent ? 301 : 302);
this.header('Location', url);
return this.body('Found. Redirecting to ' + url);
},
invalidRequest: function(body) {
this.status(400);
return this.body(body || { message: 'Invalid request', status: 400 });
},
error: function(body) {
this.status(500);
return this.body(body || { message: 'Error processing request', status: 500 });
},
serviceUnavailable: function(body) {
this.status(503);
return this.body(body || { message: 'Service unavailable', status: 503 });
},
notFound: function(body) {
this.status(404);
return this.body(body || { message: 'Not Found', status: 404 });
},
rss: function(body) {
this.contentType(CONTENT_TYPE_RSS);
return this.body(body);
},
html: function(body) {
this.contentType(CONTENT_TYPE_HTML);
return this.body(body);
},
toResponse: function(req) {
this._updateForJSONP(req);
this._addCacheHeaders();
return {
statusCode: this._status,
headers: this._headers,
body: _.isObject(this._body) ? JSON.stringify(this._body) : this._body,
};
},
_addCacheHeaders: function() {
var now = new Date(),
expiry = new Date(now.getTime() + (this._cacheDurationSeconds * 1000));
if (this._cacheDurationSeconds) {
delete this._headers.Pragma;
this._headers.Expires = expiry.toUTCString();
this._headers['Cache-Control'] = ('must-revalidate, max-age=' + this._cacheDurationSeconds);
} else {
this._headers.Expires = 'Thu, 19 Nov 1981 08:52:00 GMT';
this._headers['Cache-Control'] = 'no-cache, max-age=0, must-revalidate';
this._headers.Pragma = 'no-cache';
}
},
_updateForJSONP: function(req) {
var callback;
if (!this._isJSONPSupported || !(_.isObject(this._body) || _.isArray(this._body))) {
return;
}
if (req.hasQueryParam(this._jsonpQueryParamName) && this._isValidJSONPCallback(req.query(this._jsonpQueryParamName))) {
callback = req.query(this._jsonpQueryParamName);
this.contentType(CONTENT_TYPE_JSONP);
this._body = 'typeof ' + callback + ' === \'function\' && ' + callback + '(' + JSON.stringify(this._body) + ');';
}
},
_isValidJSONPCallback: function(name) {
return _.isEmpty(name) ? false : /^[A-Za-z0-9_\\$]+$/.test(name);
},
});
module.exports.CONTENT_TYPE_JSON = CONTENT_TYPE_JSON;
module.exports.CONTENT_TYPE_JSONP = CONTENT_TYPE_JSONP;
module.exports.CONTENT_TYPE_RSS = CONTENT_TYPE_RSS;
module.exports.CONTENT_TYPE_HTML = CONTENT_TYPE_HTML;
|