mirror of
https://github.com/crazy-max/ghaction-upx.git
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559 lines
23 KiB
JavaScript
559 lines
23 KiB
JavaScript
'use strict';
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// rfc7231 6.1
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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var statusCodeCacheableByDefault = [200, 203, 204, 206, 300, 301, 404, 405, 410, 414, 501];
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// This implementation does not understand partial responses (206)
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var understoodStatuses = [200, 203, 204, 300, 301, 302, 303, 307, 308, 404, 405, 410, 414, 501];
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var hopByHopHeaders = { 'connection': true, 'keep-alive': true, 'proxy-authenticate': true, 'proxy-authorization': true, 'te': true, 'trailer': true, 'transfer-encoding': true, 'upgrade': true };
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var excludedFromRevalidationUpdate = {
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// Since the old body is reused, it doesn't make sense to change properties of the body
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'content-length': true, 'content-encoding': true, 'transfer-encoding': true,
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'content-range': true
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};
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function parseCacheControl(header) {
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var cc = {};
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if (!header) return cc;
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// TODO: When there is more than one value present for a given directive (e.g., two Expires header fields, multiple Cache-Control: max-age directives),
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// the directive's value is considered invalid. Caches are encouraged to consider responses that have invalid freshness information to be stale
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var parts = header.trim().split(/\s*,\s*/); // TODO: lame parsing
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for (var _iterator = parts, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
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var _ref;
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if (_isArray) {
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if (_i >= _iterator.length) break;
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_ref = _iterator[_i++];
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} else {
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_i = _iterator.next();
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if (_i.done) break;
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_ref = _i.value;
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}
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var part = _ref;
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var _part$split = part.split(/\s*=\s*/, 2),
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k = _part$split[0],
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v = _part$split[1];
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cc[k] = v === undefined ? true : v.replace(/^"|"$/g, ''); // TODO: lame unquoting
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}
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return cc;
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}
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function formatCacheControl(cc) {
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var parts = [];
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for (var k in cc) {
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var v = cc[k];
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parts.push(v === true ? k : k + '=' + v);
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}
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if (!parts.length) {
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return undefined;
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}
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return parts.join(', ');
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}
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module.exports = function () {
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function CachePolicy(req, res) {
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var _ref2 = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {},
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shared = _ref2.shared,
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cacheHeuristic = _ref2.cacheHeuristic,
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immutableMinTimeToLive = _ref2.immutableMinTimeToLive,
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ignoreCargoCult = _ref2.ignoreCargoCult,
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_fromObject = _ref2._fromObject;
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_classCallCheck(this, CachePolicy);
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if (_fromObject) {
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this._fromObject(_fromObject);
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return;
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}
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if (!res || !res.headers) {
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throw Error("Response headers missing");
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}
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this._assertRequestHasHeaders(req);
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this._responseTime = this.now();
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this._isShared = shared !== false;
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this._cacheHeuristic = undefined !== cacheHeuristic ? cacheHeuristic : 0.1; // 10% matches IE
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this._immutableMinTtl = undefined !== immutableMinTimeToLive ? immutableMinTimeToLive : 24 * 3600 * 1000;
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this._status = 'status' in res ? res.status : 200;
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this._resHeaders = res.headers;
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this._rescc = parseCacheControl(res.headers['cache-control']);
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this._method = 'method' in req ? req.method : 'GET';
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this._url = req.url;
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this._host = req.headers.host;
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this._noAuthorization = !req.headers.authorization;
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this._reqHeaders = res.headers.vary ? req.headers : null; // Don't keep all request headers if they won't be used
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this._reqcc = parseCacheControl(req.headers['cache-control']);
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// Assume that if someone uses legacy, non-standard uncecessary options they don't understand caching,
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// so there's no point stricly adhering to the blindly copy&pasted directives.
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if (ignoreCargoCult && "pre-check" in this._rescc && "post-check" in this._rescc) {
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delete this._rescc['pre-check'];
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delete this._rescc['post-check'];
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delete this._rescc['no-cache'];
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delete this._rescc['no-store'];
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delete this._rescc['must-revalidate'];
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this._resHeaders = Object.assign({}, this._resHeaders, { 'cache-control': formatCacheControl(this._rescc) });
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delete this._resHeaders.expires;
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delete this._resHeaders.pragma;
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}
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// When the Cache-Control header field is not present in a request, caches MUST consider the no-cache request pragma-directive
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// as having the same effect as if "Cache-Control: no-cache" were present (see Section 5.2.1).
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if (!res.headers['cache-control'] && /no-cache/.test(res.headers.pragma)) {
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this._rescc['no-cache'] = true;
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}
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}
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CachePolicy.prototype.now = function now() {
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return Date.now();
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};
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CachePolicy.prototype.storable = function storable() {
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// The "no-store" request directive indicates that a cache MUST NOT store any part of either this request or any response to it.
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return !!(!this._reqcc['no-store'] && (
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// A cache MUST NOT store a response to any request, unless:
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// The request method is understood by the cache and defined as being cacheable, and
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'GET' === this._method || 'HEAD' === this._method || 'POST' === this._method && this._hasExplicitExpiration()) &&
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// the response status code is understood by the cache, and
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understoodStatuses.indexOf(this._status) !== -1 &&
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// the "no-store" cache directive does not appear in request or response header fields, and
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!this._rescc['no-store'] && (
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// the "private" response directive does not appear in the response, if the cache is shared, and
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!this._isShared || !this._rescc.private) && (
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// the Authorization header field does not appear in the request, if the cache is shared,
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!this._isShared || this._noAuthorization || this._allowsStoringAuthenticated()) && (
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// the response either:
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// contains an Expires header field, or
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this._resHeaders.expires ||
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// contains a max-age response directive, or
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// contains a s-maxage response directive and the cache is shared, or
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// contains a public response directive.
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this._rescc.public || this._rescc['max-age'] || this._rescc['s-maxage'] ||
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// has a status code that is defined as cacheable by default
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statusCodeCacheableByDefault.indexOf(this._status) !== -1));
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};
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CachePolicy.prototype._hasExplicitExpiration = function _hasExplicitExpiration() {
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// 4.2.1 Calculating Freshness Lifetime
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return this._isShared && this._rescc['s-maxage'] || this._rescc['max-age'] || this._resHeaders.expires;
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};
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CachePolicy.prototype._assertRequestHasHeaders = function _assertRequestHasHeaders(req) {
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if (!req || !req.headers) {
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throw Error("Request headers missing");
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}
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};
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CachePolicy.prototype.satisfiesWithoutRevalidation = function satisfiesWithoutRevalidation(req) {
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this._assertRequestHasHeaders(req);
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// When presented with a request, a cache MUST NOT reuse a stored response, unless:
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// the presented request does not contain the no-cache pragma (Section 5.4), nor the no-cache cache directive,
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// unless the stored response is successfully validated (Section 4.3), and
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var requestCC = parseCacheControl(req.headers['cache-control']);
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if (requestCC['no-cache'] || /no-cache/.test(req.headers.pragma)) {
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return false;
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}
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if (requestCC['max-age'] && this.age() > requestCC['max-age']) {
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return false;
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}
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if (requestCC['min-fresh'] && this.timeToLive() < 1000 * requestCC['min-fresh']) {
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return false;
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}
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// the stored response is either:
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// fresh, or allowed to be served stale
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if (this.stale()) {
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var allowsStale = requestCC['max-stale'] && !this._rescc['must-revalidate'] && (true === requestCC['max-stale'] || requestCC['max-stale'] > this.age() - this.maxAge());
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if (!allowsStale) {
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return false;
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}
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}
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return this._requestMatches(req, false);
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};
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CachePolicy.prototype._requestMatches = function _requestMatches(req, allowHeadMethod) {
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// The presented effective request URI and that of the stored response match, and
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return (!this._url || this._url === req.url) && this._host === req.headers.host && (
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// the request method associated with the stored response allows it to be used for the presented request, and
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!req.method || this._method === req.method || allowHeadMethod && 'HEAD' === req.method) &&
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// selecting header fields nominated by the stored response (if any) match those presented, and
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this._varyMatches(req);
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};
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CachePolicy.prototype._allowsStoringAuthenticated = function _allowsStoringAuthenticated() {
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// following Cache-Control response directives (Section 5.2.2) have such an effect: must-revalidate, public, and s-maxage.
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return this._rescc['must-revalidate'] || this._rescc.public || this._rescc['s-maxage'];
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};
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CachePolicy.prototype._varyMatches = function _varyMatches(req) {
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if (!this._resHeaders.vary) {
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return true;
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}
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// A Vary header field-value of "*" always fails to match
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if (this._resHeaders.vary === '*') {
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return false;
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}
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var fields = this._resHeaders.vary.trim().toLowerCase().split(/\s*,\s*/);
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for (var _iterator2 = fields, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) {
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var _ref3;
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if (_isArray2) {
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if (_i2 >= _iterator2.length) break;
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_ref3 = _iterator2[_i2++];
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} else {
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_i2 = _iterator2.next();
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if (_i2.done) break;
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_ref3 = _i2.value;
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}
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var name = _ref3;
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if (req.headers[name] !== this._reqHeaders[name]) return false;
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}
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return true;
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};
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CachePolicy.prototype._copyWithoutHopByHopHeaders = function _copyWithoutHopByHopHeaders(inHeaders) {
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var headers = {};
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for (var name in inHeaders) {
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if (hopByHopHeaders[name]) continue;
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headers[name] = inHeaders[name];
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}
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// 9.1. Connection
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if (inHeaders.connection) {
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var tokens = inHeaders.connection.trim().split(/\s*,\s*/);
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for (var _iterator3 = tokens, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) {
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var _ref4;
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if (_isArray3) {
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if (_i3 >= _iterator3.length) break;
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_ref4 = _iterator3[_i3++];
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} else {
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_i3 = _iterator3.next();
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if (_i3.done) break;
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_ref4 = _i3.value;
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}
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var _name = _ref4;
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delete headers[_name];
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}
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}
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if (headers.warning) {
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var warnings = headers.warning.split(/,/).filter(function (warning) {
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return !/^\s*1[0-9][0-9]/.test(warning);
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});
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if (!warnings.length) {
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delete headers.warning;
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} else {
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headers.warning = warnings.join(',').trim();
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}
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}
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return headers;
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};
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CachePolicy.prototype.responseHeaders = function responseHeaders() {
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var headers = this._copyWithoutHopByHopHeaders(this._resHeaders);
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var age = this.age();
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// A cache SHOULD generate 113 warning if it heuristically chose a freshness
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// lifetime greater than 24 hours and the response's age is greater than 24 hours.
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if (age > 3600 * 24 && !this._hasExplicitExpiration() && this.maxAge() > 3600 * 24) {
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headers.warning = (headers.warning ? `${headers.warning}, ` : '') + '113 - "rfc7234 5.5.4"';
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}
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headers.age = `${Math.round(age)}`;
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return headers;
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};
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/**
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* Value of the Date response header or current time if Date was demed invalid
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* @return timestamp
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*/
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CachePolicy.prototype.date = function date() {
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var dateValue = Date.parse(this._resHeaders.date);
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var maxClockDrift = 8 * 3600 * 1000;
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if (Number.isNaN(dateValue) || dateValue < this._responseTime - maxClockDrift || dateValue > this._responseTime + maxClockDrift) {
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return this._responseTime;
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}
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return dateValue;
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};
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/**
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* Value of the Age header, in seconds, updated for the current time.
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* May be fractional.
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*
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* @return Number
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*/
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CachePolicy.prototype.age = function age() {
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var age = Math.max(0, (this._responseTime - this.date()) / 1000);
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if (this._resHeaders.age) {
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var ageValue = this._ageValue();
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if (ageValue > age) age = ageValue;
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}
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var residentTime = (this.now() - this._responseTime) / 1000;
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return age + residentTime;
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};
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CachePolicy.prototype._ageValue = function _ageValue() {
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var ageValue = parseInt(this._resHeaders.age);
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return isFinite(ageValue) ? ageValue : 0;
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};
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/**
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* Value of applicable max-age (or heuristic equivalent) in seconds. This counts since response's `Date`.
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*
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* For an up-to-date value, see `timeToLive()`.
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*
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* @return Number
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*/
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CachePolicy.prototype.maxAge = function maxAge() {
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if (!this.storable() || this._rescc['no-cache']) {
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return 0;
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}
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// Shared responses with cookies are cacheable according to the RFC, but IMHO it'd be unwise to do so by default
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// so this implementation requires explicit opt-in via public header
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if (this._isShared && this._resHeaders['set-cookie'] && !this._rescc.public && !this._rescc.immutable) {
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return 0;
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}
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if (this._resHeaders.vary === '*') {
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return 0;
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}
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if (this._isShared) {
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if (this._rescc['proxy-revalidate']) {
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return 0;
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}
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// if a response includes the s-maxage directive, a shared cache recipient MUST ignore the Expires field.
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if (this._rescc['s-maxage']) {
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return parseInt(this._rescc['s-maxage'], 10);
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}
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}
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// If a response includes a Cache-Control field with the max-age directive, a recipient MUST ignore the Expires field.
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if (this._rescc['max-age']) {
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return parseInt(this._rescc['max-age'], 10);
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}
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var defaultMinTtl = this._rescc.immutable ? this._immutableMinTtl : 0;
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var dateValue = this.date();
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if (this._resHeaders.expires) {
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var expires = Date.parse(this._resHeaders.expires);
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// A cache recipient MUST interpret invalid date formats, especially the value "0", as representing a time in the past (i.e., "already expired").
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if (Number.isNaN(expires) || expires < dateValue) {
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return 0;
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}
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return Math.max(defaultMinTtl, (expires - dateValue) / 1000);
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}
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if (this._resHeaders['last-modified']) {
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var lastModified = Date.parse(this._resHeaders['last-modified']);
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if (isFinite(lastModified) && dateValue > lastModified) {
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return Math.max(defaultMinTtl, (dateValue - lastModified) / 1000 * this._cacheHeuristic);
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}
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}
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return defaultMinTtl;
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};
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CachePolicy.prototype.timeToLive = function timeToLive() {
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return Math.max(0, this.maxAge() - this.age()) * 1000;
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};
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CachePolicy.prototype.stale = function stale() {
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return this.maxAge() <= this.age();
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};
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CachePolicy.fromObject = function fromObject(obj) {
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return new this(undefined, undefined, { _fromObject: obj });
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};
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CachePolicy.prototype._fromObject = function _fromObject(obj) {
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if (this._responseTime) throw Error("Reinitialized");
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if (!obj || obj.v !== 1) throw Error("Invalid serialization");
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this._responseTime = obj.t;
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this._isShared = obj.sh;
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this._cacheHeuristic = obj.ch;
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this._immutableMinTtl = obj.imm !== undefined ? obj.imm : 24 * 3600 * 1000;
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this._status = obj.st;
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this._resHeaders = obj.resh;
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this._rescc = obj.rescc;
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this._method = obj.m;
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this._url = obj.u;
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this._host = obj.h;
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this._noAuthorization = obj.a;
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this._reqHeaders = obj.reqh;
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this._reqcc = obj.reqcc;
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};
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CachePolicy.prototype.toObject = function toObject() {
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return {
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v: 1,
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t: this._responseTime,
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sh: this._isShared,
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ch: this._cacheHeuristic,
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imm: this._immutableMinTtl,
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st: this._status,
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resh: this._resHeaders,
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rescc: this._rescc,
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m: this._method,
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u: this._url,
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h: this._host,
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a: this._noAuthorization,
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reqh: this._reqHeaders,
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reqcc: this._reqcc
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};
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};
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/**
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* Headers for sending to the origin server to revalidate stale response.
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* Allows server to return 304 to allow reuse of the previous response.
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*
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* Hop by hop headers are always stripped.
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* Revalidation headers may be added or removed, depending on request.
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*/
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CachePolicy.prototype.revalidationHeaders = function revalidationHeaders(incomingReq) {
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this._assertRequestHasHeaders(incomingReq);
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var headers = this._copyWithoutHopByHopHeaders(incomingReq.headers);
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// This implementation does not understand range requests
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delete headers['if-range'];
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if (!this._requestMatches(incomingReq, true) || !this.storable()) {
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// revalidation allowed via HEAD
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// not for the same resource, or wasn't allowed to be cached anyway
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delete headers['if-none-match'];
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delete headers['if-modified-since'];
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return headers;
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}
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/* MUST send that entity-tag in any cache validation request (using If-Match or If-None-Match) if an entity-tag has been provided by the origin server. */
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if (this._resHeaders.etag) {
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headers['if-none-match'] = headers['if-none-match'] ? `${headers['if-none-match']}, ${this._resHeaders.etag}` : this._resHeaders.etag;
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}
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// Clients MAY issue simple (non-subrange) GET requests with either weak validators or strong validators. Clients MUST NOT use weak validators in other forms of request.
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var forbidsWeakValidators = headers['accept-ranges'] || headers['if-match'] || headers['if-unmodified-since'] || this._method && this._method != 'GET';
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/* SHOULD send the Last-Modified value in non-subrange cache validation requests (using If-Modified-Since) if only a Last-Modified value has been provided by the origin server.
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Note: This implementation does not understand partial responses (206) */
|
|
if (forbidsWeakValidators) {
|
|
delete headers['if-modified-since'];
|
|
|
|
if (headers['if-none-match']) {
|
|
var etags = headers['if-none-match'].split(/,/).filter(function (etag) {
|
|
return !/^\s*W\//.test(etag);
|
|
});
|
|
if (!etags.length) {
|
|
delete headers['if-none-match'];
|
|
} else {
|
|
headers['if-none-match'] = etags.join(',').trim();
|
|
}
|
|
}
|
|
} else if (this._resHeaders['last-modified'] && !headers['if-modified-since']) {
|
|
headers['if-modified-since'] = this._resHeaders['last-modified'];
|
|
}
|
|
|
|
return headers;
|
|
};
|
|
|
|
/**
|
|
* Creates new CachePolicy with information combined from the previews response,
|
|
* and the new revalidation response.
|
|
*
|
|
* Returns {policy, modified} where modified is a boolean indicating
|
|
* whether the response body has been modified, and old cached body can't be used.
|
|
*
|
|
* @return {Object} {policy: CachePolicy, modified: Boolean}
|
|
*/
|
|
|
|
|
|
CachePolicy.prototype.revalidatedPolicy = function revalidatedPolicy(request, response) {
|
|
this._assertRequestHasHeaders(request);
|
|
if (!response || !response.headers) {
|
|
throw Error("Response headers missing");
|
|
}
|
|
|
|
// These aren't going to be supported exactly, since one CachePolicy object
|
|
// doesn't know about all the other cached objects.
|
|
var matches = false;
|
|
if (response.status !== undefined && response.status != 304) {
|
|
matches = false;
|
|
} else if (response.headers.etag && !/^\s*W\//.test(response.headers.etag)) {
|
|
// "All of the stored responses with the same strong validator are selected.
|
|
// If none of the stored responses contain the same strong validator,
|
|
// then the cache MUST NOT use the new response to update any stored responses."
|
|
matches = this._resHeaders.etag && this._resHeaders.etag.replace(/^\s*W\//, '') === response.headers.etag;
|
|
} else if (this._resHeaders.etag && response.headers.etag) {
|
|
// "If the new response contains a weak validator and that validator corresponds
|
|
// to one of the cache's stored responses,
|
|
// then the most recent of those matching stored responses is selected for update."
|
|
matches = this._resHeaders.etag.replace(/^\s*W\//, '') === response.headers.etag.replace(/^\s*W\//, '');
|
|
} else if (this._resHeaders['last-modified']) {
|
|
matches = this._resHeaders['last-modified'] === response.headers['last-modified'];
|
|
} else {
|
|
// If the new response does not include any form of validator (such as in the case where
|
|
// a client generates an If-Modified-Since request from a source other than the Last-Modified
|
|
// response header field), and there is only one stored response, and that stored response also
|
|
// lacks a validator, then that stored response is selected for update.
|
|
if (!this._resHeaders.etag && !this._resHeaders['last-modified'] && !response.headers.etag && !response.headers['last-modified']) {
|
|
matches = true;
|
|
}
|
|
}
|
|
|
|
if (!matches) {
|
|
return {
|
|
policy: new this.constructor(request, response),
|
|
modified: true
|
|
};
|
|
}
|
|
|
|
// use other header fields provided in the 304 (Not Modified) response to replace all instances
|
|
// of the corresponding header fields in the stored response.
|
|
var headers = {};
|
|
for (var k in this._resHeaders) {
|
|
headers[k] = k in response.headers && !excludedFromRevalidationUpdate[k] ? response.headers[k] : this._resHeaders[k];
|
|
}
|
|
|
|
var newResponse = Object.assign({}, response, {
|
|
status: this._status,
|
|
method: this._method,
|
|
headers
|
|
});
|
|
return {
|
|
policy: new this.constructor(request, newResponse),
|
|
modified: false
|
|
};
|
|
};
|
|
|
|
return CachePolicy;
|
|
}(); |