Django Tastypie Base64MultiField for file upload using "application/json" Conten-Type You need a test.png file to test

forms.py

import base64

from django import forms
from django.core.files.uploadedfile import SimpleUploadedFile


class Base64MultiField(forms.MultiValueField):
    def __init__(self, *args, **kwargs):
        kwargs['fields'] = (
            forms.CharField(),
            forms.CharField(max_length=100),
            forms.CharField(),
        )
        super(Base64MultiField, self).__init__(*args, **kwargs)

    def compress(self, data_list):
        f = SimpleUploadedFile(
            data_list[1],
            base64.b64decode(data_list[0]),
            content_type=data_list[2])
        return f

test_forms.py

from django import forms


from .forms import Base64MultiField


class PictureForm(forms.Form):

    image_full = Base64MultiField(required=True)

tests.py

import base64

from django.core.files.uploadedfile import SimpleUploadedFile

from tastypie import fields
from tastypie.test import ResourceTestCase
 
from .forms import Base64MultiField
from .test_forms import PictureForm
 

class MultiValueFieldTest(ResourceTestCase):

    def test_field(self):
        data = [base64.b64encode('base64content'), 'image_path.png', 'image/png']
        f = Base64MultiField()

        data = f.clean(data)

        self.assertIsInstance(data, SimpleUploadedFile)
        self.assertEqual(data.content_type, 'image/png')

    def test_in_form(self):
        album = Album.objects.create()
        user = User.objects.create()
        image_file = open('test.png')
        image_content = base64.b64encode(image_file.read())
        image_file.close()
        data = {'image_full': [image_content, 'image_path.png', 'image/png']}
        form = PictureForm(data)
        form.is_valid()
        obj = form.save()

        self.assertIsNotNone(obj.image_full)
        self.assertIsNotNone(obj.image_full.path)
        self.assertEqual(image_content, base64.b64encode(obj.image_full.file.read()))