finished
sorry, I clone the new source( for review) but use an old source on python
environment
在 2012年8月21日星期二UTC+8下午6时36分46秒，软刀写道：
>
>
> I now work with mongoengine, mongoForm
> and set this in setting.py
> DEFAULT_FILE_STORAGE = 'mongoengine.django.storage.GridFSStorage'
>
> I need to upload a picture, and I wrote a form like this:
>
> from django.forms import ImageField
>
> from mongoforms import MongoForm
> from documents import UserProfile
>
> class ProfileForm(MongoForm):
> photo = ImageField()
> class Meta:
> document = UserProfile
> exclude = ('user', 'photo')
>
> but I get a Invalid Image Error when I submit a picture( how ever, it's ok
> when I use PIL.Image.open(photo).verify() )
> I review the code, and found the exception was raise on
> django.forms.fields.ImageField.to_python method
> code snippet for to_python method:
> def to_python(self, data):
> ....
> if hasattr(data, 'temporary_file_path'):
> file = data.temporary_file_path()
> ....
> try:
> Image.open(file).verify()
> except ImportError:
> raise
> except Exception: # Python Imaging Library doesn't recognize it as
> an image
> raise ValidationError(self.error_messages['invalid_image'])
> ...
>
> well, I don't know well to set temporary_file_path and how to
> storage it with mongoengine.django.storage.GridFSStorage
>
>
> # this was snippet for class ImageField
> def to_python(self, data):
> """
> Checks that the file-upload field data contains a valid image
> (GIF, JPG,
> PNG, possibly others -- whatever the Python Imaging Library
> supports).
> """
> f = super(ImageField, self).to_python(data)
> if f is None:
> return None
>
> # Try to import PIL in either of the two ways it can end up
> installed.
> try:
> from PIL import Image
> except ImportError:
> import Image
>
> # We need to get a file object for PIL. We might have a path or we
> might
> # have to read the data into memory.
> if hasattr(data, 'temporary_file_path'):
> file = data.temporary_file_path()
> else:
> if hasattr(data, 'read'):
> file = StringIO(data.read())
> else:
> file = StringIO(data['content'])
>
> try:
> # load() could spot a truncated JPEG, but it loads the entire
> # image in memory, which is a DoS vector. See #3848 and #18520.
> # verify() must be called immediately after the constructor.
> Image.open(file).verify()
> except ImportError:
> # Under PyPy, it is possible to import PIL. However, the
> underlying
> # _imaging C module isn't available, so an ImportError will be
> # raised. Catch and re-raise.
> raise
> except Exception: # Python Imaging Library doesn't recognize it as
> an image
> raise ValidationError(self.error_messages['invalid_image'])
> if hasattr(f, 'seek') and callable(f.seek):
> f.seek(0)
> return f
>
>
>
>
> this was exception stack
>
> Environment:
>
>
> Request Method: POST
> Request URL: http://localhost:8000/accounts/profile/
>
> Django Version: 1.4
> Python Version: 2.7.3
> Installed Applications:
> ['django.contrib.auth',
> 'django.contrib.contenttypes',
> 'django.contrib.sessions',
> 'django.contrib.messages',
> 'django.contrib.staticfiles',
> 'registration',
> 'bussiness',
> 'accounts',
> 'debug_toolbar']
> Installed Middleware:
> ['django.middleware.common.CommonMiddleware',
> 'django.contrib.sessions.middleware.SessionMiddleware',
> 'django.middleware.csrf.CsrfViewMiddleware',
> 'django.contrib.auth.middleware.AuthenticationMiddleware',
> 'django.contrib.messages.middleware.MessageMiddleware',
> 'debug_toolbar.middleware.DebugToolbarMiddleware']
>
>
> Traceback:
> File
> "/home/yan/env/haoyoubang/local/lib/python2.7/site-packages/django/core/handlers/base.py"
>
> in get_response
> 111. response = callback(request,
> *callback_args, **callback_kwargs)
> File
> "/home/yan/env/haoyoubang/local/lib/python2.7/site-packages/django/contrib/auth/decorators.py"
>
> in _wrapped_view
> 20. return view_func(request, *args, **kwargs)
> File "/home/yan/git/haoyoubang/accounts/views.py" in profile
> 31. processFile(request.FILES['photo'])
> File "/home/yan/git/haoyoubang/accounts/views.py" in processFile
> 21. s = f.clean(photo)
> File
> "/home/yan/env/haoyoubang/local/lib/python2.7/site-packages/django/forms/fields.py"
>
> in clean
> 535. return super(FileField, self).clean(data)
> File
> "/home/yan/env/haoyoubang/local/lib/python2.7/site-packages/django/forms/fields.py"
>
> in clean
> 153. value = self.to_python(value)
> File
> "/home/yan/env/haoyoubang/local/lib/python2.7/site-packages/django/forms/fields.py"
>
> in to_python
> 593. raise
> ValidationError(self.error_messages['invalid_image'])
>
> Exception Type: ValidationError at /accounts/profile/
> Exception Value:
> [u'\u8bf7\u4e0a\u4f20\u4e00\u5f20\u6709\u6548\u7684\u56fe\u7247\u3002\u60a8\u6240\u4e0a\u4f20\u7684\u6587\u4ef6\u4e0d\u662f\u56fe\u7247\u6216\u8005\u662f\u5df2\u635f\u574f\u7684\u56fe\u7247\u3002']
>
>
>
>
>
> thank you !!
>
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