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1 files changed, 57 insertions, 0 deletions

diff --git a/node_modules/fresh/index.js b/node_modules/fresh/index.js
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+++ b/node_modules/fresh/index.js
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+
+/**
+ * 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.some(function (match) {
+      return match === '*' || match === etag || match === 'W/' + etag;
+    });
+  }
+
+  // if-modified-since
+  if (modifiedSince) {
+    modifiedSince = new Date(modifiedSince);
+    lastModified = new Date(lastModified);
+    notModified = lastModified <= modifiedSince;
+  }
+
+  return !! (etagMatches && notModified);
+}