added doga

25_02_24/node_modules/@tinyhttp/req/dist/fresh.js

@@ -0,0 +1,51 @@
+const CACHE_CONTROL_NO_CACHE_REGEXP = /(?:^|,)\s*?no-cache\s*?(?:,|$)/;
+const compareETags = (etag, str) => str === etag || str === `W/${etag}` || `W/${str}` === etag;
+function isStale(etag, noneMatch) {
+    let start = 0;
+    let end = 0;
+    for (let i = 0, len = noneMatch.length; i < len; i++) {
+        switch (noneMatch.charCodeAt(i)) {
+            case 0x20 /*   */:
+                if (start === end)
+                    start = end = i + 1;
+                break;
+            case 0x2c /* , */:
+                if (compareETags(etag, noneMatch.substring(start, end)))
+                    return false;
+                start = end = i + 1;
+                break;
+            default:
+                end = i + 1;
+                break;
+        }
+    }
+    if (compareETags(etag, noneMatch.substring(start, end)))
+        return false;
+    return true;
+}
+/**
+ * Check freshness of the response using request and response headers.
+ */
+export function fresh(reqHeaders, resHeaders) {
+    const modifiedSince = reqHeaders['if-modified-since'];
+    const noneMatch = reqHeaders['if-none-match'];
+    if (!modifiedSince && !noneMatch)
+        return false;
+    const cacheControl = reqHeaders['cache-control'];
+    if (cacheControl && CACHE_CONTROL_NO_CACHE_REGEXP.test(cacheControl))
+        return false;
+    // if-none-match
+    if (noneMatch && noneMatch !== '*') {
+        const etag = resHeaders.etag;
+        if (!etag || isStale(etag, noneMatch))
+            return false;
+    }
+    // if-modified-since
+    if (modifiedSince) {
+        const lastModified = resHeaders['last-modified'];
+        if (!lastModified || !(Date.parse(lastModified) <= Date.parse(modifiedSince)))
+            return false;
+    }
+    return true;
+}
+//# sourceMappingURL=fresh.js.map