Demo for query storing
Change-Id: I947bcac841992c3f6cfd01ab337c265b0d01cb70
diff --git a/node_modules/http-cache-semantics/node4/index.js b/node_modules/http-cache-semantics/node4/index.js
new file mode 100644
index 0000000..bcdaebe
--- /dev/null
+++ b/node_modules/http-cache-semantics/node4/index.js
@@ -0,0 +1,559 @@
+'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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