Add functionality to encode, decode and share redirects.

package.json

@@ -19,6 +19,7 @@
     "@holllo/migration-helper": "^0.1.3",
     "@holllo/preact-components": "^0.2.3",
     "htm": "^3.1.1",
+    "js-base64": "^3.7.3",
     "modern-normalize": "^1.1.0",
     "preact": "^10.11.0",
     "webextension-polyfill": "^0.10.0"

source/utilities/share-redirect.ts

@@ -0,0 +1,28 @@
+import {Base64} from 'js-base64';
+
+import {RedirectParameters} from '../redirect/exports.js';
+
+export const fragmentPrefix = '#json=';
+
+export function decodeBase64<T>(base64: string): T {
+  return JSON.parse(Base64.decode(base64)) as T;
+}
+
+export function encodeBase64(source: any): string {
+  return Base64.encode(JSON.stringify(source), true);
+}
+
+export function share(redirect: RedirectParameters): string {
+  const url = new URL('https://holllo.org/re-nav/share/');
+
+  const encoded = encodeBase64({
+    matcherType: redirect.matcherType,
+    matcherValue: redirect.matcherValue,
+    redirectType: redirect.redirectType,
+    redirectValue: redirect.redirectValue,
+  });
+
+  url.hash = `${fragmentPrefix}${encoded}`;
+
+  return url.href;
+}