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Diffstat (limited to 'deps/node/deps/npm/node_modules/http-cache-semantics/node4/index.js')
| -rw-r--r-- | deps/node/deps/npm/node_modules/http-cache-semantics/node4/index.js | 559 |
1 files changed, 0 insertions, 559 deletions
diff --git a/deps/node/deps/npm/node_modules/http-cache-semantics/node4/index.js b/deps/node/deps/npm/node_modules/http-cache-semantics/node4/index.js deleted file mode 100644 index bcdaebe8..00000000 --- a/deps/node/deps/npm/node_modules/http-cache-semantics/node4/index.js +++ /dev/null @@ -1,559 +0,0 @@ -'use strict'; -// rfc7231 6.1 - -function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } } - -var statusCodeCacheableByDefault = [200, 203, 204, 206, 300, 301, 404, 405, 410, 414, 501]; - -// This implementation does not understand partial responses (206) -var understoodStatuses = [200, 203, 204, 300, 301, 302, 303, 307, 308, 404, 405, 410, 414, 501]; - -var hopByHopHeaders = { 'connection': true, 'keep-alive': true, 'proxy-authenticate': true, 'proxy-authorization': true, 'te': true, 'trailer': true, 'transfer-encoding': true, 'upgrade': true }; -var excludedFromRevalidationUpdate = { - // Since the old body is reused, it doesn't make sense to change properties of the body - 'content-length': true, 'content-encoding': true, 'transfer-encoding': true, - 'content-range': true -}; - -function parseCacheControl(header) { - var cc = {}; - if (!header) return cc; - - // 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), - // the directive's value is considered invalid. Caches are encouraged to consider responses that have invalid freshness information to be stale - var parts = header.trim().split(/\s*,\s*/); // TODO: lame parsing - for (var _iterator = parts, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) { - var _ref; - - if (_isArray) { - if (_i >= _iterator.length) break; - _ref = _iterator[_i++]; - } else { - _i = _iterator.next(); - if (_i.done) break; - _ref = _i.value; - } - - var part = _ref; - - var _part$split = part.split(/\s*=\s*/, 2), - k = _part$split[0], - v = _part$split[1]; - - cc[k] = v === undefined ? true : v.replace(/^"|"$/g, ''); // TODO: lame unquoting - } - - return cc; -} - -function formatCacheControl(cc) { - var parts = []; - for (var k in cc) { - var v = cc[k]; - parts.push(v === true ? k : k + '=' + v); - } - if (!parts.length) { - return undefined; - } - return parts.join(', '); -} - -module.exports = function () { - function CachePolicy(req, res) { - var _ref2 = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : {}, - shared = _ref2.shared, - cacheHeuristic = _ref2.cacheHeuristic, - immutableMinTimeToLive = _ref2.immutableMinTimeToLive, - ignoreCargoCult = _ref2.ignoreCargoCult, - _fromObject = _ref2._fromObject; - - _classCallCheck(this, CachePolicy); - - if (_fromObject) { - this._fromObject(_fromObject); - return; - } - - if (!res || !res.headers) { - throw Error("Response headers missing"); - } - this._assertRequestHasHeaders(req); - - this._responseTime = this.now(); - this._isShared = shared !== false; - this._cacheHeuristic = undefined !== cacheHeuristic ? cacheHeuristic : 0.1; // 10% matches IE - this._immutableMinTtl = undefined !== immutableMinTimeToLive ? immutableMinTimeToLive : 24 * 3600 * 1000; - - this._status = 'status' in res ? res.status : 200; - this._resHeaders = res.headers; - this._rescc = parseCacheControl(res.headers['cache-control']); - this._method = 'method' in req ? req.method : 'GET'; - this._url = req.url; - this._host = req.headers.host; - this._noAuthorization = !req.headers.authorization; - this._reqHeaders = res.headers.vary ? req.headers : null; // Don't keep all request headers if they won't be used - this._reqcc = parseCacheControl(req.headers['cache-control']); - - // Assume that if someone uses legacy, non-standard uncecessary options they don't understand caching, - // so there's no point stricly adhering to the blindly copy&pasted directives. - if (ignoreCargoCult && "pre-check" in this._rescc && "post-check" in this._rescc) { - delete this._rescc['pre-check']; - delete this._rescc['post-check']; - delete this._rescc['no-cache']; - delete this._rescc['no-store']; - delete this._rescc['must-revalidate']; - this._resHeaders = Object.assign({}, this._resHeaders, { 'cache-control': formatCacheControl(this._rescc) }); - delete this._resHeaders.expires; - delete this._resHeaders.pragma; - } - - // When the Cache-Control header field is not present in a request, caches MUST consider the no-cache request pragma-directive - // as having the same effect as if "Cache-Control: no-cache" were present (see Section 5.2.1). - if (!res.headers['cache-control'] && /no-cache/.test(res.headers.pragma)) { - this._rescc['no-cache'] = true; - } - } - - CachePolicy.prototype.now = function now() { - return Date.now(); - }; - - CachePolicy.prototype.storable = function storable() { - // The "no-store" request directive indicates that a cache MUST NOT store any part of either this request or any response to it. - return !!(!this._reqcc['no-store'] && ( - // A cache MUST NOT store a response to any request, unless: - // The request method is understood by the cache and defined as being cacheable, and - 'GET' === this._method || 'HEAD' === this._method || 'POST' === this._method && this._hasExplicitExpiration()) && - // the response status code is understood by the cache, and - understoodStatuses.indexOf(this._status) !== -1 && - // the "no-store" cache directive does not appear in request or response header fields, and - !this._rescc['no-store'] && ( - // the "private" response directive does not appear in the response, if the cache is shared, and - !this._isShared || !this._rescc.private) && ( - // the Authorization header field does not appear in the request, if the cache is shared, - !this._isShared || this._noAuthorization || this._allowsStoringAuthenticated()) && ( - // the response either: - - // contains an Expires header field, or - this._resHeaders.expires || - // contains a max-age response directive, or - // contains a s-maxage response directive and the cache is shared, or - // contains a public response directive. - this._rescc.public || this._rescc['max-age'] || this._rescc['s-maxage'] || - // has a status code that is defined as cacheable by default - statusCodeCacheableByDefault.indexOf(this._status) !== -1)); - }; - - CachePolicy.prototype._hasExplicitExpiration = function _hasExplicitExpiration() { - // 4.2.1 Calculating Freshness Lifetime - return this._isShared && this._rescc['s-maxage'] || this._rescc['max-age'] || this._resHeaders.expires; - }; - - CachePolicy.prototype._assertRequestHasHeaders = function _assertRequestHasHeaders(req) { - if (!req || !req.headers) { - throw Error("Request headers missing"); - } - }; - - CachePolicy.prototype.satisfiesWithoutRevalidation = function satisfiesWithoutRevalidation(req) { - this._assertRequestHasHeaders(req); - - // When presented with a request, a cache MUST NOT reuse a stored response, unless: - // the presented request does not contain the no-cache pragma (Section 5.4), nor the no-cache cache directive, - // unless the stored response is successfully validated (Section 4.3), and - var requestCC = parseCacheControl(req.headers['cache-control']); - if (requestCC['no-cache'] || /no-cache/.test(req.headers.pragma)) { - return false; - } - - if (requestCC['max-age'] && this.age() > requestCC['max-age']) { - return false; - } - - if (requestCC['min-fresh'] && this.timeToLive() < 1000 * requestCC['min-fresh']) { - return false; - } - - // the stored response is either: - // fresh, or allowed to be served stale - if (this.stale()) { - var allowsStale = requestCC['max-stale'] && !this._rescc['must-revalidate'] && (true === requestCC['max-stale'] || requestCC['max-stale'] > this.age() - this.maxAge()); - if (!allowsStale) { - return false; - } - } - - return this._requestMatches(req, false); - }; - - CachePolicy.prototype._requestMatches = function _requestMatches(req, allowHeadMethod) { - // The presented effective request URI and that of the stored response match, and - return (!this._url || this._url === req.url) && this._host === req.headers.host && ( - // the request method associated with the stored response allows it to be used for the presented request, and - !req.method || this._method === req.method || allowHeadMethod && 'HEAD' === req.method) && - // selecting header fields nominated by the stored response (if any) match those presented, and - this._varyMatches(req); - }; - - CachePolicy.prototype._allowsStoringAuthenticated = function _allowsStoringAuthenticated() { - // following Cache-Control response directives (Section 5.2.2) have such an effect: must-revalidate, public, and s-maxage. - return this._rescc['must-revalidate'] || this._rescc.public || this._rescc['s-maxage']; - }; - - CachePolicy.prototype._varyMatches = function _varyMatches(req) { - if (!this._resHeaders.vary) { - return true; - } - - // A Vary header field-value of "*" always fails to match - if (this._resHeaders.vary === '*') { - return false; - } - - var fields = this._resHeaders.vary.trim().toLowerCase().split(/\s*,\s*/); - for (var _iterator2 = fields, _isArray2 = Array.isArray(_iterator2), _i2 = 0, _iterator2 = _isArray2 ? _iterator2 : _iterator2[Symbol.iterator]();;) { - var _ref3; - - if (_isArray2) { - if (_i2 >= _iterator2.length) break; - _ref3 = _iterator2[_i2++]; - } else { - _i2 = _iterator2.next(); - if (_i2.done) break; - _ref3 = _i2.value; - } - - var name = _ref3; - - if (req.headers[name] !== this._reqHeaders[name]) return false; - } - return true; - }; - - CachePolicy.prototype._copyWithoutHopByHopHeaders = function _copyWithoutHopByHopHeaders(inHeaders) { - var headers = {}; - for (var name in inHeaders) { - if (hopByHopHeaders[name]) continue; - headers[name] = inHeaders[name]; - } - // 9.1. Connection - if (inHeaders.connection) { - var tokens = inHeaders.connection.trim().split(/\s*,\s*/); - for (var _iterator3 = tokens, _isArray3 = Array.isArray(_iterator3), _i3 = 0, _iterator3 = _isArray3 ? _iterator3 : _iterator3[Symbol.iterator]();;) { - var _ref4; - - if (_isArray3) { - if (_i3 >= _iterator3.length) break; - _ref4 = _iterator3[_i3++]; - } else { - _i3 = _iterator3.next(); - if (_i3.done) break; - _ref4 = _i3.value; - } - - var _name = _ref4; - - delete headers[_name]; - } - } - if (headers.warning) { - var warnings = headers.warning.split(/,/).filter(function (warning) { - return !/^\s*1[0-9][0-9]/.test(warning); - }); - if (!warnings.length) { - delete headers.warning; - } else { - headers.warning = warnings.join(',').trim(); - } - } - return headers; - }; - - CachePolicy.prototype.responseHeaders = function responseHeaders() { - var headers = this._copyWithoutHopByHopHeaders(this._resHeaders); - var age = this.age(); - - // A cache SHOULD generate 113 warning if it heuristically chose a freshness - // lifetime greater than 24 hours and the response's age is greater than 24 hours. - if (age > 3600 * 24 && !this._hasExplicitExpiration() && this.maxAge() > 3600 * 24) { - headers.warning = (headers.warning ? `${headers.warning}, ` : '') + '113 - "rfc7234 5.5.4"'; - } - headers.age = `${Math.round(age)}`; - return headers; - }; - - /** - * Value of the Date response header or current time if Date was demed invalid - * @return timestamp - */ - - - CachePolicy.prototype.date = function date() { - var dateValue = Date.parse(this._resHeaders.date); - var maxClockDrift = 8 * 3600 * 1000; - if (Number.isNaN(dateValue) || dateValue < this._responseTime - maxClockDrift || dateValue > this._responseTime + maxClockDrift) { - return this._responseTime; - } - return dateValue; - }; - - /** - * Value of the Age header, in seconds, updated for the current time. - * May be fractional. - * - * @return Number - */ - - - CachePolicy.prototype.age = function age() { - var age = Math.max(0, (this._responseTime - this.date()) / 1000); - if (this._resHeaders.age) { - var ageValue = this._ageValue(); - if (ageValue > age) age = ageValue; - } - - var residentTime = (this.now() - this._responseTime) / 1000; - return age + residentTime; - }; - - CachePolicy.prototype._ageValue = function _ageValue() { - var ageValue = parseInt(this._resHeaders.age); - return isFinite(ageValue) ? ageValue : 0; - }; - - /** - * Value of applicable max-age (or heuristic equivalent) in seconds. This counts since response's `Date`. - * - * For an up-to-date value, see `timeToLive()`. - * - * @return Number - */ - - - CachePolicy.prototype.maxAge = function maxAge() { - if (!this.storable() || this._rescc['no-cache']) { - return 0; - } - - // Shared responses with cookies are cacheable according to the RFC, but IMHO it'd be unwise to do so by default - // so this implementation requires explicit opt-in via public header - if (this._isShared && this._resHeaders['set-cookie'] && !this._rescc.public && !this._rescc.immutable) { - return 0; - } - - if (this._resHeaders.vary === '*') { - return 0; - } - - if (this._isShared) { - if (this._rescc['proxy-revalidate']) { - return 0; - } - // if a response includes the s-maxage directive, a shared cache recipient MUST ignore the Expires field. - if (this._rescc['s-maxage']) { - return parseInt(this._rescc['s-maxage'], 10); - } - } - - // If a response includes a Cache-Control field with the max-age directive, a recipient MUST ignore the Expires field. - if (this._rescc['max-age']) { - return parseInt(this._rescc['max-age'], 10); - } - - var defaultMinTtl = this._rescc.immutable ? this._immutableMinTtl : 0; - - var dateValue = this.date(); - if (this._resHeaders.expires) { - var expires = Date.parse(this._resHeaders.expires); - // A cache recipient MUST interpret invalid date formats, especially the value "0", as representing a time in the past (i.e., "already expired"). - if (Number.isNaN(expires) || expires < dateValue) { - return 0; - } - return Math.max(defaultMinTtl, (expires - dateValue) / 1000); - } - - if (this._resHeaders['last-modified']) { - var lastModified = Date.parse(this._resHeaders['last-modified']); - if (isFinite(lastModified) && dateValue > lastModified) { - return Math.max(defaultMinTtl, (dateValue - lastModified) / 1000 * this._cacheHeuristic); - } - } - - return defaultMinTtl; - }; - - CachePolicy.prototype.timeToLive = function timeToLive() { - return Math.max(0, this.maxAge() - this.age()) * 1000; - }; - - CachePolicy.prototype.stale = function stale() { - return this.maxAge() <= this.age(); - }; - - CachePolicy.fromObject = function fromObject(obj) { - return new this(undefined, undefined, { _fromObject: obj }); - }; - - CachePolicy.prototype._fromObject = function _fromObject(obj) { - if (this._responseTime) throw Error("Reinitialized"); - if (!obj || obj.v !== 1) throw Error("Invalid serialization"); - - this._responseTime = obj.t; - this._isShared = obj.sh; - this._cacheHeuristic = obj.ch; - this._immutableMinTtl = obj.imm !== undefined ? obj.imm : 24 * 3600 * 1000; - this._status = obj.st; - this._resHeaders = obj.resh; - this._rescc = obj.rescc; - this._method = obj.m; - this._url = obj.u; - this._host = obj.h; - this._noAuthorization = obj.a; - this._reqHeaders = obj.reqh; - this._reqcc = obj.reqcc; - }; - - CachePolicy.prototype.toObject = function toObject() { - return { - v: 1, - t: this._responseTime, - sh: this._isShared, - ch: this._cacheHeuristic, - imm: this._immutableMinTtl, - st: this._status, - resh: this._resHeaders, - rescc: this._rescc, - m: this._method, - u: this._url, - h: this._host, - a: this._noAuthorization, - reqh: this._reqHeaders, - reqcc: this._reqcc - }; - }; - - /** - * Headers for sending to the origin server to revalidate stale response. - * Allows server to return 304 to allow reuse of the previous response. - * - * Hop by hop headers are always stripped. - * Revalidation headers may be added or removed, depending on request. - */ - - - CachePolicy.prototype.revalidationHeaders = function revalidationHeaders(incomingReq) { - this._assertRequestHasHeaders(incomingReq); - var headers = this._copyWithoutHopByHopHeaders(incomingReq.headers); - - // This implementation does not understand range requests - delete headers['if-range']; - - if (!this._requestMatches(incomingReq, true) || !this.storable()) { - // revalidation allowed via HEAD - // not for the same resource, or wasn't allowed to be cached anyway - delete headers['if-none-match']; - delete headers['if-modified-since']; - return headers; - } - - /* 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. */ - if (this._resHeaders.etag) { - headers['if-none-match'] = headers['if-none-match'] ? `${headers['if-none-match']}, ${this._resHeaders.etag}` : this._resHeaders.etag; - } - - // 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. - var forbidsWeakValidators = headers['accept-ranges'] || headers['if-match'] || headers['if-unmodified-since'] || this._method && this._method != 'GET'; - - /* 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. - 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; -}();
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