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13 | var http = require('http')
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14 | , crypto = require('crypto')
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15 | , parse = require('url').parse
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16 | , Path = require('path')
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17 | , fs = require('fs');
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27 |
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28 | exports.mime = function(req) {
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29 | var str = req.headers['content-type'] || '';
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30 | return str.split(';')[0];
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31 | };
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32 |
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38 |
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39 |
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40 |
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41 | exports.error = function(code){
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42 | var err = new Error(http.STATUS_CODES[code]);
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43 | err.status = code;
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44 | return err;
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45 | };
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59 |
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60 | exports.md5 = function(str, encoding){
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61 | return crypto
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62 | .createHash('md5')
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63 | .update(str)
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64 | .digest(encoding || 'hex');
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65 | };
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81 |
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82 | exports.merge = function(a, b){
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83 | if (a && b) {
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84 | for (var key in b) {
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85 | a[key] = b[key];
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86 | }
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87 | }
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88 | return a;
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89 | };
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90 |
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98 |
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99 | exports.escape = function(html){
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100 | return String(html)
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101 | .replace(/&(?!\w+;)/g, '&')
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102 | .replace(/</g, '<')
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103 | .replace(/>/g, '>')
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104 | .replace(/"/g, '"');
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105 | };
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118 |
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119 | exports.uid = function(len) {
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120 | return crypto.randomBytes(Math.ceil(len * 3 / 4))
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121 | .toString('base64')
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122 | .slice(0, len);
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123 | };
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132 |
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133 |
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134 | exports.sign = function(val, secret){
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135 | return val + '.' + crypto
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136 | .createHmac('sha256', secret)
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137 | .update(val)
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138 | .digest('base64')
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139 | .replace(/=+$/, '');
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140 | };
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150 |
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151 |
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152 | exports.unsign = function(val, secret){
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153 | var str = val.slice(0,val.lastIndexOf('.'));
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154 | return exports.sign(str, secret) == val
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155 | ? str
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156 | : false;
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157 | };
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168 |
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169 | exports.parseSignedCookies = function(obj, secret){
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170 | var ret = {};
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171 | Object.keys(obj).forEach(function(key){
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172 | var val = obj[key];
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173 | if (0 == val.indexOf('s:')) {
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174 | ret[key] = exports.unsign(val.slice(2), secret);
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175 | delete obj[key];
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176 | }
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177 | });
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178 | return ret;
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179 | };
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180 |
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188 |
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189 |
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190 | exports.parseSignedCookie = function(str, secret){
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191 | return 0 == str.indexOf('s:')
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192 | ? exports.unsign(str.slice(2), secret)
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193 | : str;
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194 | };
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201 |
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202 |
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203 |
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204 | exports.parseJSONCookies = function(obj){
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205 | Object.keys(obj).forEach(function(key){
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206 | var val = obj[key];
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207 | var res = exports.parseJSONCookie(val);
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208 | if (res) obj[key] = res;
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209 | });
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210 | return obj;
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211 | };
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212 |
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219 |
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220 |
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221 | exports.parseJSONCookie = function(str) {
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222 | if (0 == str.indexOf('j:')) {
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223 | try {
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224 | return JSON.parse(str.slice(2));
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225 | } catch (err) {
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226 |
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227 | }
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228 | }
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229 | }
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246 |
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247 |
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248 |
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249 | exports.pause = function(obj){
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250 | var onData
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251 | , onEnd
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252 | , events = [];
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253 |
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254 |
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255 | obj.on('data', onData = function(data, encoding){
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256 | events.push(['data', data, encoding]);
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257 | });
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258 |
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259 |
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260 | obj.on('end', onEnd = function(data, encoding){
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261 | events.push(['end', data, encoding]);
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262 | });
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263 |
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264 | return {
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265 | end: function(){
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266 | obj.removeListener('data', onData);
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267 | obj.removeListener('end', onEnd);
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268 | },
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269 | resume: function(){
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270 | this.end();
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271 | for (var i = 0, len = events.length; i < len; ++i) {
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272 | obj.emit.apply(obj, events[i]);
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273 | }
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274 | }
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275 | };
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276 | };
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277 |
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279 |
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281 |
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282 |
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283 |
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284 |
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285 | exports.removeContentHeaders = function(res){
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286 | Object.keys(res._headers).forEach(function(field){
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287 | if (0 == field.indexOf('content')) {
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288 | res.removeHeader(field);
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289 | }
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290 | });
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291 | };
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292 |
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293 |
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294 |
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295 |
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296 |
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297 |
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298 |
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299 |
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300 |
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301 | exports.conditionalGET = function(req) {
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302 | return req.headers['if-modified-since']
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303 | || req.headers['if-none-match'];
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304 | };
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305 |
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306 |
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307 |
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309 |
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310 |
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311 |
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312 |
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313 |
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314 | exports.unauthorized = function(res, realm) {
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315 | res.statusCode = 401;
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316 | res.setHeader('WWW-Authenticate', 'Basic realm="' + realm + '"');
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317 | res.end('Unauthorized');
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318 | };
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319 |
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320 |
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321 |
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322 |
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323 |
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324 |
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325 |
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326 |
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327 |
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328 | exports.notModified = function(res) {
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329 | exports.removeContentHeaders(res);
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330 | res.statusCode = 304;
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331 | res.end();
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332 | };
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333 |
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335 |
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338 |
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339 |
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340 |
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341 |
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342 |
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343 | exports.etag = function(stat) {
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344 | return '"' + stat.size + '-' + Number(stat.mtime) + '"';
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345 | };
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346 |
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347 |
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348 |
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349 |
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350 |
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351 |
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352 |
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353 |
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354 |
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355 | exports.parseCacheControl = function(str){
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356 | var directives = str.split(',')
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357 | , obj = {};
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358 |
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359 | for(var i = 0, len = directives.length; i < len; i++) {
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360 | var parts = directives[i].split('=')
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361 | , key = parts.shift().trim()
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362 | , val = parseInt(parts.shift(), 10);
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363 |
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364 | obj[key] = isNaN(val) ? true : val;
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365 | }
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366 |
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367 | return obj;
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368 | };
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369 |
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370 |
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371 |
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372 |
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373 |
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374 |
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375 |
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376 |
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377 |
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378 | exports.parseUrl = function(req){
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379 | var parsed = req._parsedUrl;
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380 | if (parsed && parsed.href == req.url) {
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381 | return parsed;
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382 | } else {
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383 | return req._parsedUrl = parse(req.url);
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384 | }
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385 | };
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386 |
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387 |
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388 |
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389 |
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390 |
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391 |
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392 |
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393 |
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394 |
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395 | exports.parseBytes = require('bytes');
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