fix issue with slashes on encoded url strings

src/utils/string.ts

@@ -21,8 +21,30 @@ const getEncodingKey = ():string => {
     return process.env.ENCODING_KEY ?? DEFAULT_ENCODING_KEY;
 } 
 
+// Funzione per codifica Base64 URL-safe
+const base64UrlEncode = (input: string): string => {
+    return btoa(input)
+        .replace(/\+/g, '-')
+        .replace(/\//g, '_')
+        .replace(/=+$/, '');
+}
+
+// Funzione per decodifica Base64 URL-safe
+const base64UrlDecode = (input: string): string => {
+    let base64 = input
+        .replace(/-/g, '+')
+        .replace(/_/g, '/');
+    
+    // Aggiungi padding se necessario
+    while (base64.length % 4) {
+        base64 += '=';
+    }
+
+    return atob(base64);
+}
+
 export function encodeUrl(url: string): string {
-    const key = getEncodingKey()
+    const key = getEncodingKey();
 
     // Convert the URL and key to UTF-8 bytes
     const urlBytes = new TextEncoder().encode(url);
@@ -31,16 +53,16 @@ export function encodeUrl(url: string): string {
     // XOR the bytes of the URL with the key bytes
     const encodedBytes = urlBytes.map((byte, index) => byte ^ keyBytes[index % keyBytes.length]);
 
-    // Convert the XORed bytes to a base64 string
+    // Convert the XORed bytes to a base64 URL-safe string
     //@ts-ignore
-    return btoa(String.fromCharCode(...encodedBytes));
+    return base64UrlEncode(String.fromCharCode(...encodedBytes));
 }
 
 export function decodeUrl(encodedUrl: string): string {
-    const key = getEncodingKey()
+    const key = getEncodingKey();
 
-    // Decode the base64 string to get the XORed bytes
+    // Decode the base64 URL-safe string to get the XORed bytes
-    const encodedBytes = Uint8Array.from(atob(encodedUrl), char => char.charCodeAt(0));
+    const encodedBytes = Uint8Array.from(base64UrlDecode(encodedUrl), char => char.charCodeAt(0));
     const keyBytes = new TextEncoder().encode(key);
 
     // XOR the encoded bytes with the key bytes to get the original URL bytes