def file_download(filename):
def send_chunk(): # 流式读取
store_path = './upload/%s' % filename
with open(store_path, 'rb') as target_file:
while True:
chunk = target_file.read(20 * 1024 * 1024) # 每次读取20M
if not chunk:
break
yield chunk
response = Response(send_chunk(), content_type='application/octet-stream')
response.content_length = os.path.getsize('./upload/%s' % filename)
return response
def get_file(package, filename):
"""
"""
pypi = current_app.config['pypi']
store = current_app.config['cached_file_store']
content_type, _ = mimetypes.guess_type(filename)
if content_type is None and filename.endswith(".egg"):
content_type = "application/zip"
f = store.get_file(package, filename)
if f:
# file is already cached locally. Send it
return send_file(f, mimetype=content_type)
## request file from pypi and stream it to client and disk
# get url of remote file
files = pypi.list_files(package)
file_info = filter(lambda f: f['filename'] == filename, files)
if not len(file_info):
abort(404)
file_info = file_info[0]
uri = file_info['remote_uri']
# start download
download = requests.get(uri, stream=True)
if download.status_code != 200:
# TODO
download.close()
abort(download.status_code)
def generate():
# TODO this is f*****g ugly
data_iter = download.iter_content(1024)
outfile = tempfile.NamedTemporaryFile(delete=False)
try:
for data in data_iter:
outfile.write(data)
yield data
finally:
for data in data_iter:
outfile.write(data)
outfile.seek(0)
# TODO verify checksum
store.add_file(package, filename, outfile)
response = Response(generate(), mimetype=content_type)
if 'content-length' in download.headers:
response.content_length = download.headers['content-length']
return response
def make_response(self):
"""读取远程的视频流，并伪装成本地的响应返回"""
header, data_iter = self.get_stream()
if self.type == "hls":
resp = Response(data_iter, status=200)
elif self.type == "mp4":
resp = Response(data_iter, status=206) # 状态码需设置为 206,否则无法拖动进度条
resp.content_range = header.get('Content-Range', None)
else:
resp = Response(data_iter, status=200)
resp.content_type = header.get('Content-Type', None)
# 设置其它响应头的信息
resp.content_length = header.get('Content-Length', None)
return resp
def return_video(self):
with open(self.item.path) as file:
file.seek(self.offset)
data = file.read(self.count)
byte_array = bytearray(data)
response = Response('Partial Content')
response.status_code = 206
response.content_length = self.count
response.content_range = 'bytes ' + self.content_range + '/' + self.file_size_in_str
response.content_type = self.video_condition.mime
response.data = byte_array
return response
def avatar_v1(address):
try:
address = aioxmpp.JID.fromstr(address)
except (ValueError, TypeError):
return abort(400, "bad address")
metadata = db.session.query(
model.Avatar.hash_,
model.Avatar.last_updated,
model.Avatar.mime_type,
).filter(model.Avatar.address == address, ).one_or_none()
if metadata is None:
return abort(404, "no avatar stored")
hash_, last_updated, mime_type = metadata
response = Response(mimetype=mime_type)
response.status_code = 500
response.add_etag(hash_)
response.last_modified = last_updated
response.expires = datetime.utcnow() + CACHE_AVATAR_TTL
response.headers["Content-Security-Policy"] = \
"frame-ancestors 'none'; default-src 'none'; style-src 'unsafe-inline'"
if (request.if_none_match.contains(hash_)
or (request.if_modified_since is not None
and last_updated <= request.if_modified_since)):
response.status_code = 304
return response
if request.method == "HEAD":
# do not fetch the data, only its size
length, = db.session.query(sqlalchemy.func.length(
model.Avatar.data), ).filter(
model.Avatar.address == address).one()
response.status_code = 200
response.content_length = length
return response
data, = db.session.query(
model.Avatar.data, ).filter(model.Avatar.address == address).one()
response.data = data
response.status_code = 200
return response
def show_attachment(id):
id = int(id)
attach = Attachment.get_by_id(id)
resp = Response(attach.content, mimetype='application/octet-stream')
resp.content_length = attach.size
filename = attach.filename
try:
filename = filename.encode('latin-1')
except UnicodeEncodeError:
filenames = {
# 'filename': "UTF-8''{}".format(url_quote(filename)),
'filename': "{}".format(url_quote(filename)),
}
else:
filenames = {'filename': filename}
resp.headers.set('Content-Disposition', 'attachment', **filenames)
return resp
def send_file(fp, mimetype):
try:
fileno = fp.fileno()
stat = os.stat(fileno)
except OSError:
stat = None
resp = Response(
wrap_file(request.environ, fp),
mimetype=mimetype,
direct_passthrough=True,
)
resp.cache_control.no_store = True
if stat is not None:
resp.cache_control.public = True
resp.content_length = stat.st_size
check = adler32(
f"{stat.st_dev}:{stat.st_ino}".encode("ascii")) & 0xFFFFFFFF
resp.set_etag(f"lektor-{stat.st_mtime}-{stat.st_size}-{check}")
return resp
def bad_range(self):
response = Response('Range Not Satisfiable')
response.status_code = 416
response.content_range = 'bytes: */' + self.file_size_in_str
response.content_length = 0
return response
