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index.js
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index.js
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'use strict';
const debug = require('debug')('restify-etag-cache');
const etag = require('etag');
const async = require('async');
const restify = require('restify');
function eTagCache(opts) {
let options = {};
Object.assign(options, opts || { weak: false });
function middleware(req, res, nextM) {
if (options.ignore_routes) {
if (options.ignore_routes.indexOf(req.route.path) > -1) {
return nextM();
}
} else if (options.ignore_urls) {
if (options.ignore_urls.indexOf(req.url) > -1) {
return nextM();
}
}
let oldWrite,
oldWriteHead,
oldEnd;
let chunks = [];
let headers = [];
oldWrite = res.write;
oldWriteHead = res.writeHead;
oldEnd = res.end;
chunks = [];
headers = [];
res.writeHead = function() {
headers.push(arguments);
};
res.write = function(chunk) {
chunks.push(chunk);
};
res.end = function(chunk) {
if (chunk) {
chunks.push(chunk);
}
res.writeHead = oldWriteHead;
res.write = oldWrite;
res.end = oldEnd;
const strEtag = etag(chunks.join(''));
res.setHeader('etag', strEtag);
debug('Generated etag: ' + strEtag);
async.eachSeries(restify.plugins.conditionalRequest(), (conditionalRequestMiddleware, nextConditionalRequestMiddleware) => {
conditionalRequestMiddleware(req, res, (stopChainFlag) => {
debug('nextConditionalRequestMiddleware');
if (stopChainFlag === false) {
nextConditionalRequestMiddleware(new Error('Send client cache headers'));
} else {
nextConditionalRequestMiddleware();
}
});
}, (err) => {
if (!err) {
headers.forEach((header) => {
oldWriteHead.apply(res, header);
});
chunks.forEach((chunk) => {
oldWrite.apply(res, [chunk]);
});
oldEnd.apply(res, arguments);
}
});
};
nextM();
}
return middleware;
}
module.exports = eTagCache;