Create dnr.ts

Author: cyfung1031

src/pkg/utils/dnr.ts

@@ -0,0 +1,46 @@
+export const isValidDNRUrlFilter = (text: string) => {
+  // https://developer.chrome.com/docs/extensions/reference/api/declarativeNetRequest?hl=en#property-RuleCondition-urlFilter
+
+  const domainNameAnchor = text.startsWith("||");
+
+  const leftAnchor = !domainNameAnchor && text.startsWith("|");
+
+  const rightAnchor = text.endsWith("|");
+
+  try {
+    let s = text;
+
+    if (domainNameAnchor) s = s.slice(2);
+    if (leftAnchor) s = s.slice(1);
+    if (rightAnchor) s = s.slice(0, -1);
+
+    const t = s.replace(/\*/g, "").replace(/^/g, "_");
+
+    // eslint-disable-next-line no-control-regex
+    if (/[^\x00-\xFF]/.test(t)) return false;
+
+    new URL(t);
+
+    return true;
+  } catch {
+    return false;
+  }
+};
+
+export const convertDomainToDNRUrlFilter = (text: string) => {
+  // will match its domain and subdomain
+  let ret;
+  text = text.toLowerCase();
+  try {
+    if (text.startsWith("http") && /^http[s*]?:\/\//.test(text)) {
+      const u = new URL(`${text.replace("http*://", "http-wildcard://")}`);
+      ret = `|${u.origin.replace("http-wildcard://", "http://")}`;
+    } else {
+      const u = new URL(`https://${text}/`);
+      ret = `||${u.hostname}`;
+    }
+  } catch {
+    throw new Error("invalid domain");
+  }
+  return ret;
+};