Question

I’m trying to upload files to the blobstore in my Google App without using a form. But I’m stuck at how to get the app to read my local file. I’m pretty new to python and Google Apps but after some cut and pasting I’ve ended up with this:

import webapp2
import urllib
import os

from google.appengine.api import files
from poster.encode import multipart_encode

class Upload(webapp2.RequestHandler):
  def get(self):
    # Create the file in blobstore
    file_name = files.blobstore.create(mime_type='application/octet-stream')

    # Get the local file path from an url param
    file_path = self.request.get('file')

    # Read the file
    file = open(file_path, "rb")
    datagen, headers = multipart_encode({"file": file})
    data = str().join(datagen) # this is supposedly memory intense and slow

    # Open the blobstore file and write to it
    with files.open(file_name, 'a') as f:
        f.write(data)

    # Finalize the file. Do this before attempting to read it.
    files.finalize(file_name)

    # Get the file's blob key
    blob_key = files.blobstore.get_blob_key(file_name)

The problem now is I don’t really know how to get hold of the local file

Answer 1

You can’t read from the local file system from within the application itself, you will need to use http POST to send the file to the app.

You can certainly do this from within another application – you just need to create the mime multipart message with the file content and POST it to your app, the sending application will just have to create the http request that you will post to the app manually. You should have a read on how to create a mime mulitpart message using c#.