Added functionality to add attachments

[p1ho]

Original Issue: #90

Added ability to attach file in cli

you can do >/a <absolute-path-to-file> (/attach works too) to upload a file to a thread.

Different file types are taken care of:

• audio
• video
• image
• file

if a file is not accepted by facebook, it will log a deny message.

How does this work?

This works by first uploading the file to https://upload.messenger.com/ajax/mercury/upload.php, if it succeeds with no errors, it will return a body with the id of the file you uploaded.

You can then append this id to the form data and POST it to https://www.messenger.com/messaging/send/ (the same endpoint where messages are sent)

Notes

• If a file is not allowed (e.g., .exe files), it will log a denied message
• Because of a bug with showing file attachments (even if it's sent by other people), it's harder to tell that this works, but if you open messenger in a browser, you can see that the files are uploaded correctly. Fix handling image attachments and animated images in current conversation #162
• This does not address image copied in clipboard

[Alex-Rose]

Hey @p1ho this is pretty cool! Sorry for the late reply, I'll give it a shot and hopefully FB didn't change their API too much so this still works

[p1ho]

Awesome! Excited to hear your feedback! I've also added a screenshot of it working above.

[p1ho]

@Alex-Rose
Hello, just added a minor commit for the merge conflict.
I just tested, the functionality still worked on my machine.