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POGoogle App Engine - Error uploading file to blobstore from Python code
 

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  1. POGoogle App Engine - Error uploading file to blobstore from Python code
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    <p>I am working on an app to process emails hitting my mailbox. I have modified my mail settings to forward incoming mails to <strong>myapp</strong>. The mails reaching <strong>myapp</strong> will be routed to the handler script ("<strong>handle_incoming_email.py</strong>") where it will be processed. My <strong>app.yaml</strong> file looks like this</p> <p>app.yaml</p> <pre><code>application: myapp version: 1-1 runtime: python27 api_version: 1 threadsafe: false default_expiration: "360d" handlers: - url: /_ah/mail/.+ script: myapp/utils/handle_incoming_email.py </code></pre> <p>The mail handler script is given below</p> <p>handle_incoming_email.py</p> <pre><code>import logging import urllib import base64 import traceback from google.appengine.ext import webapp from google.appengine.ext import blobstore from google.appengine.api import urlfetch from google.appengine.ext.webapp.util import run_wsgi_app from google.appengine.ext.webapp.mail_handlers import InboundMailHandler class ReceiveEmail(InboundMailHandler): def receive(self, message): try: for filename, filecontents in message.attachments: if filecontents.encoding: # data = filecontents data = filecontents.decode() # data = filecontents.payload # data = filecontents.payload.decode() # data = base64.b64decode(filecontents.decode()) # data = base64.b64decode(filecontents.payload) # data = base64.b64decode(filecontents.payload.decode()) upload_url = blobstore.create_upload_url('http://myapp.appspot.com/settings/saveItem/') form_fields = {'field_name': data} form_data = urllib.urlencode(form_fields) result = urlfetch.fetch(url=upload_url, payload=form_data, method=urlfetch.POST, headers={'Content-Type': 'application/x-www-form-urlencoded'}) logging.info(result) except Exception, e: traceback.print_exc() application = webapp.WSGIApplication([ReceiveEmail.mapping()], debug=True) def main(): run_wsgi_app(application) if __name__ == "__main__": main() </code></pre> <p>My requirement is to create an entity corresponding to each mail with attachment. For this, I need to parse the attachment from the mail and upload it to blobstore. However, when I try to upload the attachment to blobstore, I get the following error:</p> <p><em>The request's content type is not accepted on this URL.</em></p> <p>As you can see in the commented code in "handle_incoming_email.py", I tried different methods (trial-and-error) to get the data correct, but to no avail.</p> <p>Could someone guide me in fixing this!</p> <p>Thanks!!!</p>
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    1. COUpload? Why not write it to the blobstore.
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    2. CO@voscausa : Writing files to the blobstore is deprecated as per the [documentation](https://developers.google.com/appengine/docs/python/blobstore/#Writing_Files_to_the_Blobstore). Moreover, I might need to post the file attachment as _multipart/form-data_ to a 3rd-party API from my code.
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