File types tand fields for images, files and blob files with filenames

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Introduction

This package contains fields and wrapper objects for storing:

  • A file with a filename

  • An image with a filename

BLOB based types are supported if the z3c.blobfile package is installed. This will also require the ZODB3 package to be at version 3.8.1 or later, and BLOBs to be configured in zope.conf.

One way to make sure that z3c.blobfile is installed is to depend on the [blobs] extra to this package, e.g.:

install_requires = [
    ...
    'plone.namedfile[blobs]',
]

plone.supermodel handlers are registered if plone.supermodel is installed. The [supermodel] extra will ensure this.

See the usage.txt doctest for more details.

Changelog

1.0b2 - 2009-09-17

  • Add plone.supermodel import/export handlers (only installed if plone.supermodel is available). [optilude]

1.0b1 - 2009-05-30

  • Make z3c.blobfile (and blobs in general) a soft dependency. You’ll need to separately depend on z3c.blobfile (and probably pin it to versio 0.1.2) to get the NamedBlobFile and NamedBlobImage fields. This means that plone.namedfile can be used with ZODB versions that do not support BLOBs. This policy will probably be revisited for a 2.0 release. [optilude]

1.0a1 - 2009-04-17

  • Initial release

Usage

This demonstrates how to use the package. In this instance, we will assume that z3c.blobfile is installed so that BLOB based types are supported.

Test setup

We must first load the package’s ZCML plus some dependencies. In your own code, only the last <include /> should be necessary.

>>> configuration = """\
... <configure
...      xmlns="http://namespaces.zope.org/zope"
...      i18n_domain="plone.namedfile.tests">
...
...     <include package="zope.security" file="meta.zcml" />
...     <include package="zope.component" file="meta.zcml" />
...     <include package="zope.app.component" file="meta.zcml" />
...     <include package="zope.app.publisher" file="meta.zcml" />
...
...     <permission id="zope2.View" title="View" />
...
...     <include package="plone.namedfile" />
...
... </configure>
... """

>>> from StringIO import StringIO
>>> from zope.configuration import xmlconfig
>>> xmlconfig.xmlconfig(StringIO(configuration))

Schema fields

The following schema fields can be used to describe file data. We’ll only test the BLOB versions of the fields if z3c.blobfile is installed.

>>> from zope.interface import Interface
>>> from plone.namedfile import field
>>> from plone.namedfile.interfaces import HAVE_BLOBS

>>> class IFileContainer(Interface):
...     simple = field.NamedFile(title=u"Named file")
...     image = field.NamedImage(title=u"Named image file")
...     if HAVE_BLOBS:
...         blob = field.NamedBlobFile(title=u"Named blob file")
...         blobimage = field.NamedBlobImage(title=u"Named blob image file")

These store data with the following types.

>>> from zope.interface import implements
>>> from plone import namedfile

>>> class FileContainer(object):
...     implements(IFileContainer)
...     def __init__(self):
...         self.simple = namedfile.NamedFile()
...         self.image = namedfile.NamedImage()
...         if HAVE_BLOBS:
...             self.blob = namedfile.NamedBlobFile()
...             self.blobimage = namedfile.NamedBlobImage()

File data and content type

Let’s now show how to get and set file data.

The FileContainer class creates empty objects to start with.

>>> container = FileContainer()

>>> container.simple.data
''
>>> container.simple.contentType
''
>>> container.simple.filename is None
True

>>> container.image.data
''
>>> container.image.contentType
''
>>> container.image.filename is None
True

>>> if HAVE_BLOBS:
...     print repr(container.blob.data)
...     print repr(container.blob.contentType)
...     print repr(container.blob.filename is None)
...     print repr(container.blobimage.data)
...     print repr(container.blobimage.contentType)
...     print repr(container.blobimage.filename is None)
... else:
...     print repr('')
...     print repr('')
...     print repr(True)
...     print repr('')
...     print repr('')
...     print repr(True)
''
''
True
''
''
True

Let’s now set some actual data in these files. Notice how the constructor will attempt to guess the filename from the file extension.

>>> container.simple = namedfile.NamedFile('dummy test data', filename="test.txt")
>>> container.simple.data
'dummy test data'
>>> container.simple.contentType
'text/plain'
>>> container.simple.filename
'test.txt'

>>> if HAVE_BLOBS:
...     container.blob = namedfile.NamedBlobFile('dummy test data', filename="test.txt")
...     print repr(container.blob.data)
...     print repr(container.blob.contentType)
...     print repr(container.blob.filename)
... else:
...     print repr('dummy test data')
...     print repr('text/plain')
...     print repr('test.txt')
'dummy test data'
'text/plain'
'test.txt'

Let’s also try to read a GIF, courtesy of the zope.app.file tests:

>>> zptlogo = (
...     'GIF89a\x10\x00\x10\x00\xd5\x00\x00\xff\xff\xff\xff\xff\xfe\xfc\xfd\xfd'
...     '\xfa\xfb\xfc\xf7\xf9\xfa\xf5\xf8\xf9\xf3\xf6\xf8\xf2\xf5\xf7\xf0\xf4\xf6'
...     '\xeb\xf1\xf3\xe5\xed\xef\xde\xe8\xeb\xdc\xe6\xea\xd9\xe4\xe8\xd7\xe2\xe6'
...     '\xd2\xdf\xe3\xd0\xdd\xe3\xcd\xdc\xe1\xcb\xda\xdf\xc9\xd9\xdf\xc8\xd8\xdd'
...     '\xc6\xd7\xdc\xc4\xd6\xdc\xc3\xd4\xda\xc2\xd3\xd9\xc1\xd3\xd9\xc0\xd2\xd9'
...     '\xbd\xd1\xd8\xbd\xd0\xd7\xbc\xcf\xd7\xbb\xcf\xd6\xbb\xce\xd5\xb9\xcd\xd4'
...     '\xb6\xcc\xd4\xb6\xcb\xd3\xb5\xcb\xd2\xb4\xca\xd1\xb2\xc8\xd0\xb1\xc7\xd0'
...     '\xb0\xc7\xcf\xaf\xc6\xce\xae\xc4\xce\xad\xc4\xcd\xab\xc3\xcc\xa9\xc2\xcb'
...     '\xa8\xc1\xca\xa6\xc0\xc9\xa4\xbe\xc8\xa2\xbd\xc7\xa0\xbb\xc5\x9e\xba\xc4'
...     '\x9b\xbf\xcc\x98\xb6\xc1\x8d\xae\xbaFgs\x00\x00\x00\x00\x00\x00\x00\x00'
...     '\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00'
...     '\x00,\x00\x00\x00\x00\x10\x00\x10\x00\x00\x06z@\x80pH,\x12k\xc8$\xd2f\x04'
...     '\xd4\x84\x01\x01\xe1\xf0d\x16\x9f\x80A\x01\x91\xc0ZmL\xb0\xcd\x00V\xd4'
...     '\xc4a\x87z\xed\xb0-\x1a\xb3\xb8\x95\xbdf8\x1e\x11\xca,MoC$\x15\x18{'
...     '\x006}m\x13\x16\x1a\x1f\x83\x85}6\x17\x1b $\x83\x00\x86\x19\x1d!%)\x8c'
...     '\x866#\'+.\x8ca`\x1c`(,/1\x94B5\x19\x1e"&*-024\xacNq\xba\xbb\xb8h\xbeb'
...     '\x00A\x00;'
...     )

>>> container.image = namedfile.NamedImage(zptlogo, filename="zpt.gif")
>>> container.image.data == zptlogo
True
>>> container.image.contentType
'image/gif'
>>> container.image.filename
'zpt.gif'

>>> if HAVE_BLOBS:
...     container.blobimage = namedfile.NamedBlobImage(zptlogo, filename="zpt.gif")
...     print repr(container.blobimage.data == zptlogo)
...     print repr(container.blobimage.contentType)
...     print repr(container.blobimage.filename)
... else:
...     print repr(True)
...     print repr('image/gif')
...     print repr('zpt.gif')
True
'image/gif'
'zpt.gif'

Note that is possible for force the mimetype:

>>> container.image = namedfile.NamedImage(zptlogo, contentType='image/foo', filename="zpt.gif")
>>> container.image.data == zptlogo
True
>>> container.image.contentType
'image/foo'
>>> container.image.filename
'zpt.gif'

>>> if HAVE_BLOBS:
...     container.blobimage = namedfile.NamedBlobImage(zptlogo, contentType='image/foo', filename="zpt.gif")
...     print repr(container.blobimage.data == zptlogo)
...     print repr(container.blobimage.contentType)
...     print repr(container.blobimage.filename)
... else:
...     print repr(True)
...     print repr('image/foo')
...     print repr('zpt.gif')
True
'image/foo'
'zpt.gif'

Download view

This package also comes with a view that can be used to download files. To use it, link to ../context-object/@@download/fieldname, where fieldname is the name of the attribute on the context-object where the named file is stored.

We will test this with a dummy request, faking traversal.

>>> from plone.namedfile.browser import Download
>>> from zope.publisher.browser import TestRequest

>>> request = TestRequest()
>>> download = Download(container, request).publishTraverse(request, 'simple')
>>> download()
'dummy test data'
>>> request.response.getHeader('Content-Length')
'15'
>>> request.response.getHeader('Content-Type')
'text/plain'
>>> request.response.getHeader('Content-Disposition')
'attachment; filename="test.txt"'

>>> if HAVE_BLOBS:
...     request = TestRequest()
...     download = Download(container, request).publishTraverse(request, 'blob')
...     data = download()
...     print repr(isinstance(data, file))
...     print repr(data.read())
...     print repr(request.response.getHeader('Content-Length'))
...     print repr(request.response.getHeader('Content-Type'))
...     print repr(request.response.getHeader('Content-Disposition'))
... else:
...     print repr(True)
...     print repr('dummy test data')
...     print repr('15')
...     print repr('text/plain')
...     print repr('attachment; filename="test.txt"')
True
'dummy test data'
'15'
'text/plain'
'attachment; filename="test.txt"'

>>> request = TestRequest()
>>> download = Download(container, request).publishTraverse(request, 'image')
>>> download() == zptlogo
True

>>> request.response.getHeader('Content-Length')
'341'
>>> request.response.getHeader('Content-Type')
'image/foo'
>>> request.response.getHeader('Content-Disposition')
'attachment; filename="zpt.gif"'

>>> request = TestRequest()
>>> if HAVE_BLOBS:
...     download = Download(container, request).publishTraverse(request, 'blobimage')
...     data = download()
...     print repr(isinstance(data, file))
...     print repr(data.read() == zptlogo)
...     print repr(request.response.getHeader('Content-Length'))
...     print repr(request.response.getHeader('Content-Type'))
...     print repr(request.response.getHeader('Content-Disposition'))
... else:
...     print repr(True)
...     print repr(True)
...     print repr('341')
...     print repr('image/foo')
...     print repr('attachment; filename="zpt.gif"')
True
True
'341'
'image/foo'
'attachment; filename="zpt.gif"'

Project details

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organization icon Plone
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Avatar for davisagli from gravatar.com davisagli Avatar for esteele from gravatar.com esteele Avatar for laurencerowe from gravatar.com laurencerowe Avatar for miohtama from gravatar.com miohtama Avatar for optilude from gravatar.com optilude Avatar for timo from gravatar.com timo

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