Attachments in encrypted rooms are not automatically decrypted

[manueldavid123]

Attachments in encrypted rooms are not automatically decrypted

[manueldavid123]

After an intense search in other projects, I have found the solution to my problem.

When a file is uploaded to a private room, the content of that file is encrypted. Once downloaded, it is necessary to decrypt it using external libraries.

Here I show an example code to decrypt files from Matrix:

    @match_event(File)
    async def file_skill(self, event):
        try:
            data_in_bytes = await event.get_file_bytes()
            content = event.raw_event['content']

            if ('file' in content):
                # The file is encoded
                file_data = event.raw_event['content']['file']
                
                data_in_bytes = crypto.attachments.decrypt_attachment(
                                        data_in_bytes,
                                        file_data["key"]["k"],
                                        file_data["hashes"]["sha256"],
                                        file_data["iv"],
                                    )
            	

            return data_in_bytes.decode('utf-8')
        except BaseException as e:
        	logging.error(e)

        return None

In my opinion, this information should be added to the connectors documentation.

If anyone has any comments, fell free to post it. Otherwise, this issue can be closed.

[Cadair]

Thanks for figuring this one out and providing the code to decrypt the attachment. We should definitely add this to the connector so it's transparent to the skills.

[u7498708]

Hi there, was wondering if this has been done and if not if I could be assigned to it? I am a first time contributor so I might ask a few questions about it if I get stuck. Thanks and looking forward to hearing back!

[u7498708]

@Cadair just in case I needed to mention you :)