1 files changed, 29 insertions, 0 deletions
diff --git a/node_modules/http-basic/lib/cache-utils.js b/node_modules/http-basic/lib/cache-utils.js
new file mode 100644
index 0000000..3f76b0f
--- /dev/null
+++ b/node_modules/http-basic/lib/cache-utils.js
@@ -0,0 +1,29 @@
+'use strict';
+
+exports.isMatch = function (requestHeaders, cachedResponse) {
+  if (cachedResponse.headers['vary'] && cachedResponse.requestHeaders) {
+    return cachedResponse.headers['vary'].split(',').map(function (header) { return header.trim().toLowerCase(); }).every(function (header) {
+      return requestHeaders[header] === cachedResponse.requestHeaders[header];
+    });
+  } else {
+    return true;
+  }
+};
+exports.isExpired = function (cachedResponse) {
+  var match
+  if (cachedResponse.headers['cache-control'] && (match = /^public\, *max\-age\=(\d+)$/.exec(cachedResponse.headers['cache-control']))) {
+    var time = (Date.now() - cachedResponse.requestTimestamp) / 1000;
+    if ((+match[1]) > time) {
+      return false;
+    }
+  }
+  if (cachedResponse.statusCode === 301 || cachedResponse.statusCode === 308) return false;
+  return true;
+};
+exports.canCache = function (res) {
+  if (res.headers['etag']) return true;
+  if (/^public\, *max\-age\=(\d+)$/.test(res.headers['cache-control'])) return true;
+  if (res.statusCode === 301 || res.statusCode === 308) return true;
+
+  return false;
+};