kopia lustrzana https://github.com/cirospaciari/socketify.py
110 wiersze
3.9 KiB
Python
110 wiersze
3.9 KiB
Python
from aiofile import async_open
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import os
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import time
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import mimetypes
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from os import path
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mimetypes.init()
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# In production we highly recomend to use CDN like CloudFlare or/and NGINX or similar for static files
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async def sendfile(res, req, filename):
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# read headers before the first await
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if_modified_since = req.get_header("if-modified-since")
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range_header = req.get_header("range")
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bytes_range = None
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start = 0
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end = -1
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# parse range header
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if range_header:
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bytes_range = range_header.replace("bytes=", "").split("-")
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start = int(bytes_range[0])
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if bytes_range[1]:
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end = int(bytes_range[1])
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try:
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exists = path.exists(filename)
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# not found
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if not exists:
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return res.write_status(404).end(b"Not Found")
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# get size and last modified date
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stats = os.stat(filename)
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total_size = stats.st_size
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size = total_size
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last_modified = time.strftime(
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"%a, %d %b %Y %H:%M:%S GMT", time.gmtime(stats.st_mtime)
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)
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# check if modified since is provided
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if if_modified_since == last_modified:
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return res.write_status(304).end_without_body()
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# tells the broswer the last modified date
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res.write_header(b"Last-Modified", last_modified)
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# add content type
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(content_type, encoding) = mimetypes.guess_type(filename, strict=True)
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if content_type and encoding:
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res.write_header(b"Content-Type", "%s; %s" % (content_type, encoding))
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elif content_type:
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res.write_header(b"Content-Type", content_type)
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async with async_open(filename, "rb") as fd:
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# check range and support it
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if start > 0 or not end == -1:
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if end < 0 or end >= size:
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end = size - 1
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size = end - start + 1
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fd.seek(start)
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if start > total_size or size > total_size or size < 0 or start < 0:
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return res.write_status(416).end_without_body()
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res.write_status(206)
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else:
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end = size - 1
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res.write_status(200)
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# tells the browser that we support range
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# TODO: FIX BYTE RANGE IN ASYNC
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# res.write_header(b'Accept-Ranges', b'bytes')
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# res.write_header(b'Content-Range', 'bytes %d-%d/%d' % (start, end, total_size))
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pending_size = size
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# keep sending until abort or done
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while not res.aborted:
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chunk_size = 16384 # 16kb chunks
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if chunk_size > pending_size:
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chunk_size = pending_size
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buffer = await fd.read(chunk_size)
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pending_size = pending_size - chunk_size
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(ok, done) = await res.send_chunk(buffer, size)
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if not ok or done: # if cannot send probably aborted
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break
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except Exception as error:
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res.write_status(500).end("Internal Error")
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def in_directory(file, directory):
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# make both absolute
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directory = path.join(path.realpath(directory), "")
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file = path.realpath(file)
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# return true, if the common prefix of both is equal to directory
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# e.g. /a/b/c/d.rst and directory is /a/b, the common prefix is /a/b
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return path.commonprefix([file, directory]) == directory
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def static_route(app, route, directory):
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def route_handler(res, req):
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url = req.get_url()
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res.grab_aborted_handler()
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url = url[len(route) : :]
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if url.startswith("/"):
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url = url[1::]
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filename = path.join(path.realpath(directory), url)
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if not in_directory(filename, directory):
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res.write_status(404).end_without_body()
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return
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res.run_async(sendfile(res, req, filename))
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if route.startswith("/"):
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route = route[1::]
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app.get("%s/*" % route, route_handler)
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