mirror of
https://git.collinwebdesigns.de/oscar.krause/fastapi-dls.git
synced 2024-11-23 15:31:00 +03:00
64 lines
2.1 KiB
Python
64 lines
2.1 KiB
Python
import json
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import logging
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import re
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from starlette.middleware.base import BaseHTTPMiddleware
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from starlette.requests import Request
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logger = logging.getLogger(__name__)
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class PatchMalformedJsonMiddleware(BaseHTTPMiddleware):
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# see oscar.krause/fastapi-dls#1
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REGEX = '(\"mac_address_list\"\:\s?\[)([\w\d])'
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def __init__(self, app, enabled: bool):
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super().__init__(app)
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self.enabled = enabled
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async def dispatch(self, request: Request, call_next):
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body = await request.body()
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content_type = request.headers.get('Content-Type')
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if self.enabled and content_type == 'application/json':
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logger.debug(f'Using Request-Patch because "PatchMalformedJsonMiddleware" is enabled!')
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# try to fix json
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body = body.decode()
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try:
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j = json.loads(body)
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self.fix_mac_address_list_length(j=j, size=1)
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except json.decoder.JSONDecodeError:
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logger.warning(f'Malformed json received! Try to fix it.')
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s = PatchMalformedJsonMiddleware.fix_json(body)
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logger.debug(f'Fixed JSON: "{s}"')
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j = json.loads(s) # ensure json is now valid
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j = self.fix_mac_address_list_length(j=j, size=1)
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# set new body
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request._body = json.dumps(j).encode('utf-8')
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response = await call_next(request)
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return response
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def fix_mac_address_list_length(self, j: dict, size: int = 1) -> dict:
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if not self.enabled:
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return j
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# reduce "mac_address_list" to
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environment = j.get('environment', {})
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fingerprint = environment.get('fingerprint', {})
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mac_address = fingerprint.get('mac_address_list', [])
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if len(mac_address) > 0:
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logger.info(f'Transforming "mac_address_list" to length of {size}.')
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j['environment']['fingerprint']['mac_address_list'] = mac_address[:size]
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return j
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@staticmethod
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def fix_json(s: str) -> str:
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s = s.replace('\t', '')
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s = s.replace('\n', '')
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return re.sub(PatchMalformedJsonMiddleware.REGEX, r'\1"\2', s)
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