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