[16.0] p7m file encoded twice by the supplier failed to be loaded

[yle-scopea]

Module

l10n_it_fatturapa / l10n_it_fatturapa_in

Describe the bug

Somehow, supplier provide a p7m file that has been encoded twice in base 64. The module that allow us to load XML file decode the base 64 ony once and then the import failed.

To Reproduce

Versions affected:

• 14.0: yes
• 16.0: [16.0][FIX] p7m file encoded twice #4404

Steps to reproduce the behavior:

1. Encode any xml file twice with base 64
2. Try to import the Incoming E-bill Files

Expected behavior
File has to be decoded depiste the count of encoding

We have ask to our customer the authorization to share the with you.

[yle-scopea]

Here a file provided by our custmer to let you test and analyze. I don't have any information regarding why the file has this encoding.

failed_file.txt

Regards

[SirAionTech]

Thanks for reporting this!
I can't find any documentation in https://www.agenziaentrate.gov.it/portale/web/guest/specifiche-tecniche-versione-1.8 or https://www.fatturapa.gov.it/it/norme-e-regole/DocumentazioneSDI for this multiple encoding; before working on the solution I'd like to see the official documentation of this use-case.

Can someone validate the file attached in #4405 (comment) following

Per anticipare sul proprio file i controlli effettuati dal Sistema è consigliabile sottoporre il file FatturaPA a una verifica preventiva tramite l’applicazione disponibile sul portale dell’ Agenzia delle entrate Fatture e Corrispettivi (percorso Fatturazione elettronica e Conservazione – Funzionalità di supporto (Controlla fattura)).

(from https://www.fatturapa.gov.it/it/sistemainterscambio/controlli-ed-errori)