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lint: src/node/utils/caching_middleware.js

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John McLear 2021-01-21 21:06:52 +00:00 • committed by Richard Hansen
parent 02c1bf7d81
commit f664f84da5
1 changed files with 18 additions and 21 deletions
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39
src/node/utils/caching_middleware.js
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@ -1,3 +1,5 @@
'use strict';
/* /*
* 2011 Peter 'Pita' Martischka (Primary Technology Ltd) * 2011 Peter 'Pita' Martischka (Primary Technology Ltd)
* *
@ -47,18 +49,16 @@ CACHE_DIR = existsSync(CACHE_DIR) ? CACHE_DIR : undefined;
const responseCache = {}; const responseCache = {};
function djb2Hash(data) { const djb2Hash = (data) => {
const chars = data.split('').map((str) => str.charCodeAt(0)); const chars = data.split('').map((str) => str.charCodeAt(0));
return `${chars.reduce((prev, curr) => ((prev << 5) + prev) + curr, 5381)}`; return `${chars.reduce((prev, curr) => ((prev << 5) + prev) + curr, 5381)}`;
} };
function generateCacheKeyWithSha256(path) { const generateCacheKeyWithSha256 =
return _crypto.createHash('sha256').update(path).digest('hex'); (path) => _crypto.createHash('sha256').update(path).digest('hex');
}
function generateCacheKeyWithDjb2(path) { const generateCacheKeyWithDjb2 =
return Buffer.from(djb2Hash(path)).toString('hex'); (path) => Buffer.from(djb2Hash(path)).toString('hex');
}
let generateCacheKey; let generateCacheKey;
@ -66,7 +66,7 @@ if (_crypto) {
generateCacheKey = generateCacheKeyWithSha256; generateCacheKey = generateCacheKeyWithSha256;
} else { } else {
generateCacheKey = generateCacheKeyWithDjb2; generateCacheKey = generateCacheKeyWithDjb2;
console.warn('No crypto support in this nodejs runtime. A fallback to Djb2 (weaker) will be used.'); console.warn('No crypto support in this nodejs runtime. Djb2 (weaker) will be used.');
} }
// MIMIC https://github.com/microsoft/TypeScript/commit/9677b0641cc5ba7d8b701b4f892ed7e54ceaee9a - END // MIMIC https://github.com/microsoft/TypeScript/commit/9677b0641cc5ba7d8b701b4f892ed7e54ceaee9a - END
@ -80,8 +80,8 @@ if (_crypto) {
function CachingMiddleware() { function CachingMiddleware() {
} }
CachingMiddleware.prototype = new function () { CachingMiddleware.prototype = new function () {
function handle(req, res, next) { const handle = (req, res, next) => {
if (!(req.method == 'GET' || req.method == 'HEAD') || !CACHE_DIR) { if (!(req.method === 'GET' || req.method === 'HEAD') || !CACHE_DIR) {
return next(undefined, req, res); return next(undefined, req, res);
} }
@ -89,7 +89,7 @@ CachingMiddleware.prototype = new function () {
const old_res = {}; const old_res = {};
const supportsGzip = const supportsGzip =
(req.get('Accept-Encoding') || '').indexOf('gzip') != -1; (req.get('Accept-Encoding') || '').indexOf('gzip') !== -1;
const path = require('url').parse(req.url).path; const path = require('url').parse(req.url).path;
const cacheKey = generateCacheKey(path); const cacheKey = generateCacheKey(path);
@ -116,7 +116,7 @@ CachingMiddleware.prototype = new function () {
const _headers = {}; const _headers = {};
old_res.setHeader = res.setHeader; old_res.setHeader = res.setHeader;
res.setHeader = function (key, value) { res.setHeader = (key, value) => {
// Don't set cookies, see issue #707 // Don't set cookies, see issue #707
if (key.toLowerCase() === 'set-cookie') return; if (key.toLowerCase() === 'set-cookie') return;
@ -126,11 +126,8 @@ CachingMiddleware.prototype = new function () {
old_res.writeHead = res.writeHead; old_res.writeHead = res.writeHead;
res.writeHead = function (status, headers) { res.writeHead = function (status, headers) {
const lastModified = (res.getHeader('last-modified') &&
new Date(res.getHeader('last-modified')));
res.writeHead = old_res.writeHead; res.writeHead = old_res.writeHead;
if (status == 200) { if (status === 200) {
// Update cache // Update cache
let buffer = ''; let buffer = '';
@ -169,7 +166,7 @@ CachingMiddleware.prototype = new function () {
respond(); respond();
}); });
}; };
} else if (status == 304) { } else if (status === 304) {
// Nothing new changed from the cached version. // Nothing new changed from the cached version.
old_res.write = res.write; old_res.write = res.write;
old_res.end = res.end; old_res.end = res.end;
@ -204,10 +201,10 @@ CachingMiddleware.prototype = new function () {
const lastModified = (headers['last-modified'] && const lastModified = (headers['last-modified'] &&
new Date(headers['last-modified'])); new Date(headers['last-modified']));
if (statusCode == 200 && lastModified <= modifiedSince) { if (statusCode === 200 && lastModified <= modifiedSince) {
res.writeHead(304, headers); res.writeHead(304, headers);
res.end(); res.end();
} else if (req.method == 'GET') { } else if (req.method === 'GET') {
const readStream = fs.createReadStream(pathStr); const readStream = fs.createReadStream(pathStr);
res.writeHead(statusCode, headers); res.writeHead(statusCode, headers);
readStream.pipe(res); readStream.pipe(res);
@ -217,7 +214,7 @@ CachingMiddleware.prototype = new function () {
} }
} }
}); });
} };
this.handle = handle; this.handle = handle;
}(); }();