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import imghdr
import os
from typing import Set, Dict, Union
import cairo
import gi
gi.require_version('GdkPixbuf', '2.0')
gi.require_version('Rsvg', '2.0')
from gi.repository import GdkPixbuf, GLib, Rsvg
from . import exiftool
# Make pyflakes happy
assert Set
class SVGParser(exiftool.ExiftoolParser):
mimetypes = {'image/svg+xml', }
meta_allowlist = {'Directory', 'ExifToolVersion', 'FileAccessDate',
'FileInodeChangeDate', 'FileModifyDate', 'FileName',
'FilePermissions', 'FileSize', 'FileType',
'FileTypeExtension', 'ImageHeight', 'ImageWidth',
'MIMEType', 'SVGVersion', 'SourceFile', 'ViewBox'
}
def remove_all(self) -> bool:
svg = Rsvg.Handle.new_from_file(self.filename)
dimensions = svg.get_dimensions()
surface = cairo.SVGSurface(self.output_filename,
dimensions.height,
dimensions.width)
context = cairo.Context(surface)
svg.render_cairo(context)
surface.finish()
return True
def get_meta(self) -> Dict[str, Union[str, dict]]:
meta = super().get_meta()
# The namespace is mandatory, but only the …/2000/svg is valid.
ns = 'http://www.w3.org/2000/svg'
if meta.get('Xmlns', ns) == ns:
meta.pop('Xmlns')
return meta
class PNGParser(exiftool.ExiftoolParser):
mimetypes = {'image/png', }
meta_allowlist = {'SourceFile', 'ExifToolVersion', 'FileName',
'Directory', 'FileSize', 'FileModifyDate',
'FileAccessDate', 'FileInodeChangeDate',
'FilePermissions', 'FileType', 'FileTypeExtension',
'MIMEType', 'ImageWidth', 'BitDepth', 'ColorType',
'Compression', 'Filter', 'Interlace', 'BackgroundColor',
'ImageSize', 'Megapixels', 'ImageHeight'}
def __init__(self, filename):
super().__init__(filename)
if imghdr.what(filename) != 'png':
raise ValueError
try: # better fail here than later
cairo.ImageSurface.create_from_png(self.filename)
except MemoryError: # pragma: no cover
raise ValueError
def remove_all(self) -> bool:
if self.lightweight_cleaning:
return self._lightweight_cleanup()
surface = cairo.ImageSurface.create_from_png(self.filename)
surface.write_to_png(self.output_filename)
return True
class GIFParser(exiftool.ExiftoolParser):
mimetypes = {'image/gif'}
meta_allowlist = {'AnimationIterations', 'BackgroundColor', 'BitsPerPixel',
'ColorResolutionDepth', 'Directory', 'Duration',
'ExifToolVersion', 'FileAccessDate',
'FileInodeChangeDate', 'FileModifyDate', 'FileName',
'FilePermissions', 'FileSize', 'FileType',
'FileTypeExtension', 'FrameCount', 'GIFVersion',
'HasColorMap', 'ImageHeight', 'ImageSize', 'ImageWidth',
'MIMEType', 'Megapixels', 'SourceFile',}
def remove_all(self) -> bool:
return self._lightweight_cleanup()
class GdkPixbufAbstractParser(exiftool.ExiftoolParser):
""" GdkPixbuf can handle a lot of surfaces, so we're rending images on it,
this has the side-effect of completely removing metadata.
"""
_type = ''
def __init__(self, filename):
super().__init__(filename)
# we can't use imghdr here because of https://bugs.python.org/issue28591
try:
GdkPixbuf.Pixbuf.new_from_file(self.filename)
except GLib.GError:
raise ValueError
def remove_all(self) -> bool:
if self.lightweight_cleaning:
return self._lightweight_cleanup()
_, extension = os.path.splitext(self.filename)
pixbuf = GdkPixbuf.Pixbuf.new_from_file(self.filename)
if extension.lower() == '.jpg':
extension = '.jpeg' # gdk is picky
pixbuf.savev(self.output_filename, type=extension[1:], option_keys=[], option_values=[])
return True
class JPGParser(GdkPixbufAbstractParser):
_type = 'jpeg'
mimetypes = {'image/jpeg'}
meta_allowlist = {'SourceFile', 'ExifToolVersion', 'FileName',
'Directory', 'FileSize', 'FileModifyDate',
'FileAccessDate', "FileInodeChangeDate",
'FilePermissions', 'FileType', 'FileTypeExtension',
'MIMEType', 'ImageWidth', 'ImageSize', 'BitsPerSample',
'ColorComponents', 'EncodingProcess', 'JFIFVersion',
'ResolutionUnit', 'XResolution', 'YCbCrSubSampling',
'YResolution', 'Megapixels', 'ImageHeight'}
class TiffParser(GdkPixbufAbstractParser):
_type = 'tiff'
mimetypes = {'image/tiff'}
meta_allowlist = {'Compression', 'ExifByteOrder', 'ExtraSamples',
'FillOrder', 'PhotometricInterpretation',
'PlanarConfiguration', 'RowsPerStrip', 'SamplesPerPixel',
'StripByteCounts', 'StripOffsets', 'BitsPerSample',
'Directory', 'ExifToolVersion', 'FileAccessDate',
'FileInodeChangeDate', 'FileModifyDate', 'FileName',
'FilePermissions', 'FileSize', 'FileType',
'FileTypeExtension', 'ImageHeight', 'ImageSize',
'ImageWidth', 'MIMEType', 'Megapixels', 'SourceFile'}
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