How to decode a string encoded by C# Convert.ToBase64String in python 3

Question

The c# server side:

[HttpGet("{id}")]
public ActionResult Get(int id)
{
    var user = new User
    {
        Id = id,
        Name = $"User{id}"
    };

     using(var ms = new MemoryStream())
     {
         ProtoBuf.Serializer.Serialize(ms, user);
         var bytes = ms.ToArray();
         var str = Convert.ToBase64String(bytes);
         return Json(str);
     }
 }

the python client side:

async def foo():
    async with ClientSession() as session:
        async with session.get("http://localhost:57968/api/values/5") as response:
            json = await response.json()
            # how to get the bytes created by the server
            person = Person.create_from_bytes(bs)

How to get the raw bytes array created by the server using ProtoBuf.Serializer.Serialize(ms, user); in the python client.

If i do not wrap the raw byte array with base64:

Update: I worked it out in the python client side like this:

json = await response.json()
bs = json.encode("ascii")
b64 = base64.b64decode(bs)
person = Person.create_from_bytes(b64)
print(f"{person.id} {person.name}")

Answer 1

I had some time to develop this Solution for Python3.7, considering as example:

'''        Argument =   [110, 13, 46, 136, 95, 66, 92, 132, 109, 217, 58, 112, 43, 8, 145, 
                         42, 233, 98, 40, 139, 165, 228, 52, 9, 89, 175, 146, 103, 227, 238, 233, 190, 
                         78, 175, 242, 224, 202, 138, 248, 103, 114, 98, 199, 252, 80, 86, 61, 174]
            return =    'bg0uiF9CXIRt2TpwKwiRKuliKIul5DQJWa+SZ+Pu6b5Or/Lgyor4Z3Jix/xQVj2u' 
'''

Like this:

import base64
import numpy as np


# Do the same as Convert.ToBase64String() from C#
def ConvertToBase64String(encrypted):
    return (base64.b64encode(textoUnicodeToUtf8Literal(("".join([chr(item) for item in np.array(encrypted, dtype=np.uint8)]))).encode('ISO-8859-1'))).decode()

# Do the oposite of Convert.ToBase64String() from C#
def ConvertToStringBase64(encrypted):
    return np.frombuffer(base64.b64decode(encrypted.encode()), np.uint8)


def textoUnicodeToUtf8Literal(encodando):
    return encodando.replace("\xc2\x80", r'\x80').replace("\xc2\x81", r'\x81').replace("\xc2\x82", r'\x82')\
        .replace("\xc2\x83", r'\x83').replace("\xc2\x84", r'\x84').replace("\xc2\x85", r'\x85')\
        .replace("\xc2\x86", r'\x86').replace("\xc2\x87", r'\x87').replace("\xc2\x88", r'\x88')\
        .replace("\xc2\x89", r'\x89').replace("\xc2\x8a", r'\x8A').replace("\xc2\x8b", r'\x8B')\
        .replace("\xc2\x8c", r'\x8C').replace("\xc2\x8d", r'\x8D').replace("\xc2\x8e", r'\x8E')\
        .replace("\xc2\x8f", r'\x8F').replace("\xc2\x90", r'\x90').replace("\xc2\x91", r'\x91')\
        .replace("\xc2\x92", r'\x92').replace("\xc2\x93", r'\x93').replace("\xc2\x94", r'\x94')\
        .replace("\xc2\x95", r'\x95').replace("\xc2\x96", r'\x96').replace("\xc2\x97", r'\x97')\
        .replace("\xc2\x98", r'\x98').replace("\xc2\x99", r'\x99').replace("\xc2\x9a", r'\x9A')\
        .replace("\xc2\x9b", r'\x9B').replace("\xc2\x9c", r'\x9C').replace("\xc2\x9d", r'\x9D')\
        .replace("\xc2\x9e", r'\x9E').replace("\xc2\x9f", r'\x9F').replace("\xc2\xa0", r'\xA0')\
        .replace("\xc2\xa1", r'\xA1').replace("\xc2\xa2", r'\xA2').replace("\xc2\xa3", r'\xA3')\
        .replace("\xc2\xa4", r'\xA4').replace("\xc2\xa5", r'\xA5').replace("\xc2\xa6", r'\xA6')\
        .replace("\xc2\xa7", r'\xA7').replace("\xc2\xa8", r'\xA8').replace("\xc2\xa9", r'\xA9')\
        .replace("\xc2\xaa", r'\xAA').replace("\xc2\xab", r'\xAB').replace("\xc2\xac", r'\xAC')\
        .replace("\xc2\xad", r'\xAD').replace("\xc2\xae", r'\xAE').replace("\xc2\xaf", r'\xAF')\
        .replace("\xc2\xb0", r'\xB0').replace("\xc2\xb1", r'\xB1').replace("\xc2\xb2", r'\xB2')\
        .replace("\xc2\xb3", r'\xB3').replace("\xc2\xb4", r'\xB4').replace("\xc2\xb5", r'\xB5')\
        .replace("\xc2\xb6", r'\xB6').replace("\xc2\xb7", r'\xB7').replace("\xc2\xb8", r'\xB8')\
        .replace("\xc2\xb9", r'\xB9').replace("\xc2\xba", r'\xBA').replace("\xc2\xbb", r'\xBB')\
        .replace("\xc2\xbc", r'\xBC').replace("\xc2\xbd", r'\xBD').replace("\xc2\xbe", r'\xBE')\
        .replace("\xc2\xbf", r'\xBF').replace("\xc3\x80", r'\xC0').replace("\xc3\x81", r'\xC1')\
        .replace("\xc3\x82", r'\xC2').replace("\xc3\x83", r'\xC3').replace("\xc3\x84", r'\xC4')\
        .replace("\xc3\x85", r'\xC5').replace("\xc3\x86", r'\xC6').replace("\xc3\x87", r'\xC7')\
        .replace("\xc3\x88", r'\xC8').replace("\xc3\x89", r'\xC9').replace("\xc3\x8a", r'\xCA')\
        .replace("\xc3\x8b", r'\xCB').replace("\xc3\x8c", r'\xCC').replace("\xc3\x8d", r'\xCD')\
        .replace("\xc3\x8e", r'\xCE').replace("\xc3\x8f", r'\xCF').replace("\xc3\x90", r'\xD0')\
        .replace("\xc3\x91", r'\xD1').replace("\xc3\x92", r'\xD2').replace("\xc3\x93", r'\xD3')\
        .replace("\xc3\x94", r'\xD4').replace("\xc3\x95", r'\xD5').replace("\xc3\x96", r'\xD6')\
        .replace("\xc3\x97", r'\xD7').replace("\xc3\x98", r'\xD8').replace("\xc3\x99", r'\xD9')\
        .replace("\xc3\x9a", r'\xDA').replace("\xc3\x9b", r'\xDB').replace("\xc3\x9c", r'\xDC')\
        .replace("\xc3\x9d", r'\xDD').replace("\xc3\x9e", r'\xDE').replace("\xc3\x9f", r'\xDF')\
        .replace("\xc3\xa0", r'\xE0').replace("\xc3\xa1", r'\xE1').replace("\xc3\xa2", r'\xE2')\
        .replace("\xc3\xa3", r'\xE3').replace("\xc3\xa4", r'\xE4').replace("\xc3\xa5", r'\xE5')\
        .replace("\xc3\xa6", r'\xE6').replace("\xc3\xa7", r'\xE7').replace("\xc3\xa8", r'\xE8')\
        .replace("\xc3\xa9", r'\xE9').replace("\xc3\xaa", r'\xEA').replace("\xc3\xab", r'\xEB')\
        .replace("\xc3\xac", r'\xEC').replace("\xc3\xad", r'\xED').replace("\xc3\xae", r'\xEE')\
        .replace("\xc3\xaf", r'\xEF').replace("\xc3\xb0", r'\xF0').replace("\xc3\xb1", r'\xF1')\
        .replace("\xc3\xb2", r'\xF2').replace("\xc3\xb3", r'\xF3').replace("\xc3\xb4", r'\xF4')\
        .replace("\xc3\xb5", r'\xF5').replace("\xc3\xb6", r'\xF6').replace("\xc3\xb7", r'\xF7')\
        .replace("\xc3\xb8", r'\xF8').replace("\xc3\xb9", r'\xF9').replace("\xc3\xba", r'\xFA')\
        .replace("\xc3\xbb", r'\xFB').replace("\xc3\xbc", r'\xFC').replace("\xc3\xbd", r'\xFD')\
        .replace("\xc3\xbe", r'\xFE').replace("\xc3\xbf", r'\xFF')

Answer 2

Finally, i worked it out in the client side by using:

json = await response.json()
bs = json.encode("ascii")
b64 = base64.b64decode(bs)
person = Person.create_from_bytes(b64)
print(f"{person.id} {person.name}")