submit / upload file via JSON API Call

[msc23]

after login and getting session id i will upload an 1,5 MB file with the following code:

def sendSmallFile(file_content_as_base64, file_name):
    print("try to send small file to sandbox")
    print(f"start of base64 content: {file_content_as_base64[:100]}")
    print(f"got filename: {file_name}")
    submitURL = "https://fortisand-api.our-domain.de/jsonrpc/"
    submit_json_data = {
        "method": "set",
        "params": [
            {
                "file": file_content_as_base64,
                "filename": file_name,
                "skip_steps": "2",
                "url": "/submit-file",
                "type": "file",
                "vrecord": "0",
                "enable_ai": "",
                "forcedvm": 1,
                "browser": 0
            }
        ],
        "session": session_id,
        "id": 11,
        "ver": "4.4.0"
    }

    response = requests.post(submitURL, json=submit_json_data)
    sid = getValueFromResponse(response.json(), "sid")
    print(f"sid: {sid}")

the base64 content is encoded: 

file_content = file.read()
file_content_base64 = base64.b64encode(file_content)

in the debugger it looks ok:

but python get me an TypeError: Object of type bytes is not JSON serializable (in the code line to get the response from the request).

Any ideas?

thanks a lot!

[mpapisetty · Accepted solution]

@msc23 ,

The issue is that base64.b64encode(file_content) will return an encoded output but as bytes. Bytes cannot be JSON serialized. You will have to use decode again to get it to parse via json. 

Example below for a sample content - 

>>> json.dumps(base64.b64encode(b'filecontent'))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python3.10/json/__init__.py", line 231, in dumps
return _default_encoder.encode(obj)
File "/usr/lib/python3.10/json/encoder.py", line 199, in encode
chunks = self.iterencode(o, _one_shot=True)
File "/usr/lib/python3.10/json/encoder.py", line 257, in iterencode
return _iterencode(o, 0)
File "/usr/lib/python3.10/json/encoder.py", line 179, in default
raise TypeError(f'Object of type {o.__class__.__name__} '
TypeError: Object of type bytes is not JSON serializable
>>>

The above error can be resolved by adding a decode() - 

>>> json.dumps(base64.b64encode(b'filecontent').decode())
'"ZmlsZWNvbnRlbnQ="'
>>>

Hope this helps!