+++ /dev/null
-
-/**
- * Expose `fresh()`.
- */
-
-module.exports = fresh;
-
-/**
- * Check freshness of `req` and `res` headers.
- *
- * When the cache is "fresh" __true__ is returned,
- * otherwise __false__ is returned to indicate that
- * the cache is now stale.
- *
- * @param {Object} req
- * @param {Object} res
- * @return {Boolean}
- * @api public
- */
-
-function fresh(req, res) {
- // defaults
- var etagMatches = true;
- var notModified = true;
-
- // fields
- var modifiedSince = req['if-modified-since'];
- var noneMatch = req['if-none-match'];
- var lastModified = res['last-modified'];
- var etag = res['etag'];
- var cc = req['cache-control'];
-
- // unconditional request
- if (!modifiedSince && !noneMatch) return false;
-
- // check for no-cache cache request directive
- if (cc && cc.indexOf('no-cache') !== -1) return false;
-
- // parse if-none-match
- if (noneMatch) noneMatch = noneMatch.split(/ *, */);
-
- // if-none-match
- if (noneMatch) etagMatches = ~noneMatch.indexOf(etag) || '*' == noneMatch[0];
-
- // if-modified-since
- if (modifiedSince) {
- modifiedSince = new Date(modifiedSince);
- lastModified = new Date(lastModified);
- notModified = lastModified <= modifiedSince;
- }
-
- return !! (etagMatches && notModified);
-}
\ No newline at end of file