Added base64 encoding / decoding code

app/utils/textUtilities.ts

@@ -1,5 +1,5 @@
 /* Copy to Clipboard */
-export async function copyToClipboard(textToCopy: string, type: string) {
+export async function copyToClipboard(textToCopy: string, type: string, id: string) {
   const toast = useToast()
 
   try {
@@ -14,3 +14,50 @@ export async function copyToClipboard(textToCopy: string, type: string) {
     console.error('Failed to copy: ', err)
   }
 }
+
+/* Function to copy url with search parameters into clipboard */
+export function copyParagraphToUrl(id: string) {
+  console.log('Encoding id', id)
+
+  const highlights = {
+    highlights: [
+      {
+        id: id,
+        color: '#f90'
+      }
+    ]
+  }
+
+  const blob = encodeObjectToBase64Url(highlights)
+
+  console.log('Encoded highlights', blob)
+
+  console.log('Decoded highlights object', base64UrlDecode(blob))
+}
+
+/* Encode JS object to base64Url compatible string */
+function encodeObjectToBase64Url(obj: object) {
+  // 1. Convert object to JSON string
+  const jsonString = JSON.stringify(obj)
+
+  // 2. Base64 encode the JSON string
+  const base64 = btoa(jsonString)
+
+  // 3. Make it URL-safe and remove padding
+  return base64
+    .replace(/\+/g, '-')
+    .replace(/\//g, '_')
+    .replace(/=+$/, '')
+}
+
+/* Decode base64URL String to json object */
+function base64UrlDecode(base64Url: string) {
+  // Replace URL-safe characters and add padding
+  let base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/');
+  while (base64.length % 4 !== 0) {
+    base64 += '='
+  }
+  return decodeURIComponent(atob(base64).split('').map(function (c) {
+    return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)
+  }).join(''))
+}