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61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
4 years ago
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from email.utils import mktime_tz, parsedate_tz
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import re
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from django.core.files.base import File
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from django.http import HttpResponse, HttpResponseNotModified
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from django.utils.http import http_date
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def sendfile(request, filepath, **kwargs):
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'''Use the SENDFILE_ROOT value composed with the path arrived as argument
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to build an absolute path with which resolve and return the file contents.
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If the path points to a file out of the root directory (should cover both
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situations with '..' and symlinks) then a 404 is raised.
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'''
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statobj = filepath.stat()
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# Respect the If-Modified-Since header.
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if not was_modified_since(request.META.get('HTTP_IF_MODIFIED_SINCE'),
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statobj.st_mtime, statobj.st_size):
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return HttpResponseNotModified()
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with File(filepath.open('rb')) as f:
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response = HttpResponse(f.chunks())
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response["Last-Modified"] = http_date(statobj.st_mtime)
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return response
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def was_modified_since(header=None, mtime=0, size=0):
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"""
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Was something modified since the user last downloaded it?
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header
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This is the value of the If-Modified-Since header. If this is None,
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I'll just return True.
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mtime
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This is the modification time of the item we're talking about.
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size
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This is the size of the item we're talking about.
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"""
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try:
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if header is None:
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raise ValueError
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matches = re.match(r"^([^;]+)(; length=([0-9]+))?$", header,
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re.IGNORECASE)
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header_date = parsedate_tz(matches.group(1))
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if header_date is None:
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raise ValueError
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header_mtime = mktime_tz(header_date)
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header_len = matches.group(3)
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if header_len and int(header_len) != size:
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raise ValueError
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if mtime > header_mtime:
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raise ValueError
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except (AttributeError, ValueError, OverflowError):
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return True
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return False
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