Falcon and falcon-multipart + POST request for uploading files implementation - python-3.x

Question

I'm trying to implement POST request for uploading files with Falcon framework (python).
I have used falcon-multipart in order to multipart/form-data, this allow me to retrieve my file in a cgi.FieldStorage() in which file is in binary format, but now, I need to write this file in a directory with the original extension.
This is the code I'm using.
app.py:
import falcon
from .files import Resource
from falcon_multipart.middleware import MultipartMiddleware
api = application = falcon.API(middleware=[MultipartMiddleware()])
files = Resource()
api.add_route('/files', files)
files.py:
import io
import os
import shutil
import falcon
import json
class Resource(object):
_storage_path = './uploaded_files'
def on_post(self, req, resp):
"""
POST METHOD
"""
# Retrieve file extension
ext = req.get_param('extension')
# Retrieve input_file
input_file = req.get_param('file')
# Read file as binary
raw = input_file.file.read()
# Retrieve filename
filename = input_file.filename
# Define file_path
file_path = os.path.join(self._storage_path, filename)
# Write to a temporary file to prevent incomplete files from
# being used.
temp_file_path = file_path + '~'
# Finally write the data to a temporary file
with open(temp_file_path, 'wb') as output_file:
shutil.copyfileobj(raw, output_file)
# Now that we know the file has been fully saved to disk
# move it into place.
os.rename(temp_file_path, file_path)
resp.status = falcon.HTTP_201

Answer 1

I had to study cgi
cgi - File upload
cgi - Big file upload
This is the implementation I used:
def on_post(self, req, resp):
"""
POST METHOD
"""
# Retrieve input_file
input_file = req.get_param('file')
# Test if the file was uploaded
if input_file.filename:
# Retrieve filename
filename = input_file.filename
# Define file_path
file_path = os.path.join(self._storage_path, filename)
# Write to a temporary file to prevent incomplete files
# from being used.
temp_file_path = file_path + '~'
open(temp_file_path, 'wb').write(input_file.file.read())
# Now that we know the file has been fully saved to disk
# move it into place.
os.rename(temp_file_path, file_path)
resp.status = falcon.HTTP_201

Answer 2

Try this - more detail explained here
import io
import os
import uuid
import mimetypes
import falcon
import json
class Resource(object):
_CHUNK_SIZE_BYTES = 4096
def __init__(self, storage_path):
self._storage_path = storage_path
def on_post(self, req, resp):
image = req.get_param("profilePic")
# image_type = req.get_param("profilePic").type
ext = mimetypes.guess_extension(req.content_type)
filename = "{uuid}{ext}".format(uuid=uuid.uuid4(), ext=ext)
image_path = os.path.join(self._storage_path, filename)
with open(image_path, "wb") as image_file:
while True:
chunk = image.file.read(4096)
image_file.write(chunk)
if not chunk:
break
resp.status = falcon.HTTP_200
resp.location = filename
resp.body = json.dumps("{name:" + image_path + "}")
import falcon
from falcon_multipart.middleware import MultipartMiddleware
api = application = falcon.API(middleware=[MultipartMiddleware()])
images = Resource('images')
api.add_route('/images', images)`