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import pickle
from django.core.exceptions import ValidationError
from django.core.files.uploadedfile import SimpleUploadedFile
from django.core.validators import validate_image_file_extension
from django.forms import FileField, FileInput
from django.test import SimpleTestCase
class FileFieldTest(SimpleTestCase):
def test_filefield_1(self):
f = FileField()
with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
f.clean('')
with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
f.clean('', '')
self.assertEqual('files/test1.pdf', f.clean('', 'files/test1.pdf'))
with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
f.clean(None)
with self.assertRaisesMessage(ValidationError, "'This field is required.'"):
f.clean(None, '')
self.assertEqual('files/test2.pdf', f.clean(None, 'files/test2.pdf'))
no_file_msg = "'No file was submitted. Check the encoding type on the form.'"
file = SimpleUploadedFile(None, b'')
file._name = ''
with self.assertRaisesMessage(ValidationError, no_file_msg):
f.clean(file)
with self.assertRaisesMessage(ValidationError, no_file_msg):
f.clean(file, '')
self.assertEqual('files/test3.pdf', f.clean(None, 'files/test3.pdf'))
with self.assertRaisesMessage(ValidationError, no_file_msg):
f.clean('some content that is not a file')
with self.assertRaisesMessage(ValidationError, "'The submitted file is empty.'"):
f.clean(SimpleUploadedFile('name', None))
with self.assertRaisesMessage(ValidationError, "'The submitted file is empty.'"):
f.clean(SimpleUploadedFile('name', b''))
self.assertEqual(SimpleUploadedFile, type(f.clean(SimpleUploadedFile('name', b'Some File Content'))))
self.assertIsInstance(
f.clean(SimpleUploadedFile('我隻氣墊船裝滿晒鱔.txt', 'मेरी मँडराने वाली नाव सर्पमीनों से भरी ह'.encode())),
SimpleUploadedFile
)
self.assertIsInstance(
f.clean(SimpleUploadedFile('name', b'Some File Content'), 'files/test4.pdf'),
SimpleUploadedFile
)
def test_filefield_2(self):
f = FileField(max_length=5)
with self.assertRaisesMessage(ValidationError, "'Ensure this filename has at most 5 characters (it has 18).'"):
f.clean(SimpleUploadedFile('test_maxlength.txt', b'hello world'))
self.assertEqual('files/test1.pdf', f.clean('', 'files/test1.pdf'))
self.assertEqual('files/test2.pdf', f.clean(None, 'files/test2.pdf'))
self.assertIsInstance(f.clean(SimpleUploadedFile('name', b'Some File Content')), SimpleUploadedFile)
def test_filefield_3(self):
f = FileField(allow_empty_file=True)
self.assertIsInstance(f.clean(SimpleUploadedFile('name', b'')), SimpleUploadedFile)
def test_filefield_changed(self):
"""
The value of data will more than likely come from request.FILES. The
value of initial data will likely be a filename stored in the database.
Since its value is of no use to a FileField it is ignored.
"""
f = FileField()
# No file was uploaded and no initial data.
self.assertFalse(f.has_changed('', None))
# A file was uploaded and no initial data.
self.assertTrue(f.has_changed('', {'filename': 'resume.txt', 'content': 'My resume'}))
# A file was not uploaded, but there is initial data
self.assertFalse(f.has_changed('resume.txt', None))
# A file was uploaded and there is initial data (file identity is not dealt
# with here)
self.assertTrue(f.has_changed('resume.txt', {'filename': 'resume.txt', 'content': 'My resume'}))
def test_disabled_has_changed(self):
f = FileField(disabled=True)
self.assertIs(f.has_changed('x', 'y'), False)
def test_file_picklable(self):
self.assertIsInstance(pickle.loads(pickle.dumps(FileField())), FileField)
class MultipleFileInput(FileInput):
allow_multiple_selected = True
class MultipleFileField(FileField):
def __init__(self, *args, **kwargs):
kwargs.setdefault("widget", MultipleFileInput())
super().__init__(*args, **kwargs)
def clean(self, data, initial=None):
single_file_clean = super().clean
if isinstance(data, (list, tuple)):
result = [single_file_clean(d, initial) for d in data]
else:
result = single_file_clean(data, initial)
return result
class MultipleFileFieldTest(SimpleTestCase):
def test_file_multiple(self):
f = MultipleFileField()
files = [
SimpleUploadedFile("name1", b"Content 1"),
SimpleUploadedFile("name2", b"Content 2"),
]
self.assertEqual(f.clean(files), files)
def test_file_multiple_empty(self):
f = MultipleFileField()
files = [
SimpleUploadedFile("empty", b""),
SimpleUploadedFile("nonempty", b"Some Content"),
]
msg = "'The submitted file is empty.'"
with self.assertRaisesMessage(ValidationError, msg):
f.clean(files)
with self.assertRaisesMessage(ValidationError, msg):
f.clean(files[::-1])
def test_file_multiple_validation(self):
f = MultipleFileField(validators=[validate_image_file_extension])
good_files = [
SimpleUploadedFile("image1.jpg", b"fake JPEG"),
SimpleUploadedFile("image2.png", b"faux image"),
SimpleUploadedFile("image3.bmp", b"fraudulent bitmap"),
]
self.assertEqual(f.clean(good_files), good_files)
evil_files = [
SimpleUploadedFile("image1.sh", b"#!/bin/bash -c 'echo pwned!'\n"),
SimpleUploadedFile("image2.png", b"faux image"),
SimpleUploadedFile("image3.jpg", b"fake JPEG"),
]
evil_rotations = (
evil_files[i:] + evil_files[:i] # Rotate by i.
for i in range(len(evil_files))
)
msg = "File extension “sh” is not allowed. Allowed extensions are: "
for rotated_evil_files in evil_rotations:
with self.assertRaisesMessage(ValidationError, msg):
f.clean(rotated_evil_files)
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