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38 lines
1.1 KiB
Python
38 lines
1.1 KiB
Python
import json
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import re
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from typing import Tuple
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from ..utils import load_json_preserve_order_and_dupe_keys
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from .lexers.json import PREFIX_REGEX
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def load_prefixed_json(data: str) -> Tuple[str, json.JSONDecoder]:
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"""Simple JSON loading from `data`.
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"""
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# First, the full data.
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try:
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return '', load_json_preserve_order_and_dupe_keys(data)
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except ValueError as exc:
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raise ValueError('Invalid JSON') from exc
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# Then, try to find the start of the actual body.
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data_prefix, body = parse_prefixed_json(data)
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try:
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return data_prefix, load_json_preserve_order_and_dupe_keys(body)
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except ValueError as exc:
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raise ValueError('Invalid JSON') from exc
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def parse_prefixed_json(data: str) -> Tuple[str, str]:
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"""Find the potential JSON body from `data`.
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Sometimes the JSON body is prefixed with a XSSI magic string, specific to the server.
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Return a tuple (data prefix, actual JSON body).
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"""
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matches = re.findall(PREFIX_REGEX, data)
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data_prefix = matches[0] if matches else ''
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body = data[len(data_prefix):]
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return data_prefix, body
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