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import os
from cStringIO import StringIO
import pylons
import Image
from gridfs import GridFS
from ming import schema
from ming.orm import session, FieldProperty
from ming.orm.declarative import MappedClass
from .session import project_orm_session
from allura.lib import utils
SUPPORTED_BY_PIL=set([
'image/jpg',
'image/jpeg',
'image/pjpeg',
'image/png',
'image/x-png',
'image/gif'])
class File(MappedClass):
class __mongometa__:
session = project_orm_session
name = 'fs'
indexes = [ 'filename' ]
_id = FieldProperty(schema.ObjectId)
file_id = FieldProperty(schema.ObjectId)
filename=FieldProperty(str, if_missing='unknown')
content_type=FieldProperty(str)
def __init__(self, **kw):
super(File, self).__init__(**kw)
if self.content_type is None:
self.content_type = utils.guess_mime_type(self.filename)
@classmethod
def _fs(cls):
return GridFS(
session(cls).impl.db,
cls._root_collection())
@classmethod
def _root_collection(cls):
return cls.__mongometa__.name
@classmethod
def remove(cls, spec):
for fobj in cls.query.find(spec):
fobj.delete()
@classmethod
def from_stream(cls, filename, stream, **kw):
obj = cls(filename=filename, **kw)
with obj.wfile() as fp_w:
while True:
s = stream.read()
if not s: break
fp_w.write(s)
return obj
@classmethod
def from_path(cls, path, **kw):
filename = os.path.basename(path)
with open(path, 'rb') as stream:
return cls.from_stream(filename, stream, **kw)
@classmethod
def from_data(cls, filename, data, **kw):
return cls.from_stream(filename, StringIO(data), **kw)
def delete(self):
self._fs().delete(self.file_id)
super(File, self).delete()
def rfile(self):
return self._fs().get(self.file_id)
def wfile(self):
fp = self._fs().new_file(
filename=self.filename,
content_type=self.content_type)
self.file_id = fp._id
return fp
def serve(self, embed=True):
'''Sets the response headers and serves as a wsgi iter'''
fp = self.rfile()
pylons.response.headers['Content-Type'] = ''
pylons.response.content_type = fp.content_type.encode('utf-8')
if not embed:
pylons.response.headers.add(
'Content-Disposition',
'attachment;filename=%s' % self.filename)
return iter(fp)
@classmethod
def save_thumbnail(cls, filename, image,
content_type,
thumbnail_size=None,
thumbnail_meta=None,
square=False):
format = image.format
height = image.size[0]
width = image.size[1]
if square and height != width:
sz = max(width, height)
if 'transparency' in image.info:
new_image = Image.new('RGBA', (sz,sz))
else:
new_image = Image.new('RGB', (sz,sz), 'white')
if height < width:
# image is wider than tall, so center horizontally
new_image.paste(image, ((width-height)/2, 0))
elif height > width:
# image is taller than wide, so center vertically
new_image.paste(image, (0, (height-width)/2))
image = new_image
if thumbnail_size:
image.thumbnail(thumbnail_size, Image.ANTIALIAS)
thumbnail_meta = thumbnail_meta or {}
thumbnail = cls(
filename=filename, content_type=content_type, **thumbnail_meta)
with thumbnail.wfile() as fp_w:
if 'transparency' in image.info:
image.save(fp_w, format, transparency=image.info['transparency'])
else:
image.save(fp_w, format)
return thumbnail
@classmethod
def save_image(cls, filename, fp,
content_type=None,
thumbnail_size=None,
thumbnail_meta=None,
square=False,
save_original=False,
original_meta=None):
if content_type is None:
content_type = utils.guess_mime_type(filename)
if not content_type.lower() in SUPPORTED_BY_PIL:
return None, None
image = Image.open(fp)
format = image.format
if save_original:
original_meta = original_meta or {}
original = cls(
filename=filename, content_type=content_type, **original_meta)
with original.wfile() as fp_w:
if 'transparency' in image.info:
image.save(fp_w, format, transparency=image.info['transparency'])
else:
image.save(fp_w, format)
else:
original = None
thumbnail = cls.save_thumbnail(filename, image, content_type, thumbnail_size, thumbnail_meta, square)
return original, thumbnail
def is_image(self):
return (self.content_type
and self.content_type.lower() in SUPPORTED_BY_PIL)
@property
def length(self):
return self.rfile().length

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