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pythondatasetsactive-learningtext-annotationdatasetnatural-language-processingdata-labelingmachine-learningannotation-tool
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35 lines
1.5 KiB
35 lines
1.5 KiB
import os
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from django.utils.deprecation import MiddlewareMixin
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class RangesMiddleware(MiddlewareMixin):
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"""Quick solution. See:
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https://stackoverflow.com/questions/14324250/byte-ranges-in-django/35928017#35928017
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"""
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def process_response(self, request, response):
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if response.status_code != 200 or not hasattr(response, 'file_to_stream'):
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return response
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http_range = request.META.get('HTTP_RANGE')
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if not (http_range and http_range.startswith('bytes=') and http_range.count('-') == 1):
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return response
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if_range = request.META.get('HTTP_IF_RANGE')
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if if_range and if_range != response.get('Last-Modified') and if_range != response.get('ETag'):
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return response
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f = response.file_to_stream
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statobj = os.fstat(f.fileno())
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start, end = http_range.split('=')[1].split('-')
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if not start: # requesting the last N bytes
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start = max(0, statobj.st_size - int(end))
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end = ''
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start, end = int(start or 0), int(end or statobj.st_size - 1)
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assert 0 <= start < statobj.st_size, (start, statobj.st_size)
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end = min(end, statobj.st_size - 1)
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f.seek(start)
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old_read = f.read
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f.read = lambda n: old_read(min(n, end + 1 - f.tell()))
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response.status_code = 206
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response['Content-Length'] = end + 1 - start
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response['Content-Range'] = 'bytes %d-%d/%d' % (start, end, statobj.st_size)
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return response
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