How to decode base 64 text URL?

Need help
1

Help needed to decode a base 64 text. This is some background info:

  1. via API I get the following json data that I save in Bubble DB:
 "attachments": [
        {
            "attachment_id": "1517840981837.pdf",
            "file_name": "file1.pdf",
            "file_extension": "pdf",
            "file_size": 586549,
            "file_url": "{encrypted_url}",
            "url_type": "DOWNLOAD_URL",
            "attachment_type": "INVOICE",
            "read_only": false,
            "content_type": "binary/octet-stream",
            "upload_time": "2018-02-05T14:29:43.989Z"
        },
  1. as you can see the file_url is encrypted and this is an example of what I get :

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

  1. the service provider knowledge base says this:

The Base64 string of the File URL encrypted by DES in ECB mode, Pkcs7 padding scheme and using [Token]

  1. they suggest to decrypt the attachment file url using the JavaScript library of crypto standards ‘CryptoJS’ like this
var internal_token = "<token>";
var file_url = "<file_url_encrypted>";

function decryptByDES(ciphertext, key) {
    var keyHex = CryptoJS.enc.Utf8.parse(key);
    // direct decrypt ciphertext
    var decrypted = CryptoJS.DES.decrypt({
        ciphertext: CryptoJS.enc.Base64.parse(ciphertext)
    }, keyHex, {
        mode: CryptoJS.mode.ECB,
        padding: CryptoJS.pad.Pkcs7
    });
    return decrypted.toString(CryptoJS.enc.Utf8);
}

console.log("decrypted url:" + decryptByDES(file_url, internal_token))

I do have the token.

Question is : how do I get the decrypted URL in Bubble ?

Thanks for helping me out.

2

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