解码包含 Base64 的 JSON

Question

I'm sending a request for a set of images to one of my API's. The API returns these images in a JSON format. This format contains data about the resource together with a single property that represents the image in Base64.

An example of the JSON being returned.

{
    "id": 548613,
    "filename": "00548613.png",
    "pictureTaken": "2020-03-30T11:38:21.003",
    "isVisible": true,
    "lotcode": 23,
    "company": "05",
    "concern": "46",
    "base64": "..."
}

The correct content of the Base64
The incorrectly parsed Base64

This is done with the Python3 requests library. When i receive a successful response from the API i attempt to decode the body to JSON using:

url = self.__url__(f"/rest/all/V1/products/{sku}/images")
headers = self.__headers__()
r = requests.get(url=url, headers=headers)
if r.status_code == 200:
    return r.json()
elif r.status_code == 404:
    return None
else:
    raise IOError(
        f"Error retrieving product '{sku}', got {r.status_code}: '{r.text}'")

Calling .json() results in the Base64 content being messed up, some parts are not there, and some are replaced with other characters. I tried manually decoding the content using r.content.decode() with the utf-8 and ascii options to see if this was the problem after seeing this post . Sadly this didn't work. I know the response from the server is correct, it works with Postman, and calling print(r.content) results in a JSON document containing the valid Base64.

How would i go about de-serializing the response from the API to get the valid Base64?

Answer 1

import base64
import re
...
b64text = re.search(b"\"base64\": \"(?P<base>.*)\"", r.content, flags=re.MULTILINE).group("base")
decode = base64.b64decode(b64text).decode(utf-8)

Since you're saying "calling print(r.content) results in the valid Base64", it's just a matter of decoding the base64.