How to upload an image through appengine endpoints api?

I am using Endpoints Proto Datastore API. Suppose I have code like this :

Model :

class MyModel(EndpointsModel):
  _message_fields_schema = ('name', 'image')
  name = ndb.StringProperty()
  image = ndb.BlobProperty()

API :

@endpoints.api(name='myapi', version='v1', description='my api')
class MyApi(remote.Service):

@MyModel.method(name='mymodel.insert', path='mymodel')
def insert_mymodel(self, data):
    data.put()
    return data

How can I upload image to the datastore through api? Thank you in advance.

Haven't done it myself but taken from here. You need to use the bytes type and encode the image into base64:

When using Cloud Endpoints, the bytes sent to a BytesField must be base64 encoded.

After being sent and validated through Google's API infrastructure, the base64 encoded bytes will be sent along to your protorpc.remote.Service class and converted from a base64 string to a native byte-string (instance of str) in Python.

So you'll need your clients to take the image bytes and convert them to base64.

To encode a byte string as base64 in Javascript, see How can you encode to Base64 using Javascript?, to do the same in Python, simply call

import base64 base64.b64encode(byte_string)