90 lines
3.4 KiB
Python
90 lines
3.4 KiB
Python
import imghdr
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import os
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from typing import Set
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import cairo
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import gi
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gi.require_version('GdkPixbuf', '2.0')
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from gi.repository import GdkPixbuf
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from . import exiftool
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# Make pyflakes happy
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assert Set
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class PNGParser(exiftool.ExiftoolParser):
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mimetypes = {'image/png', }
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meta_whitelist = {'SourceFile', 'ExifToolVersion', 'FileName',
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'Directory', 'FileSize', 'FileModifyDate',
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'FileAccessDate', 'FileInodeChangeDate',
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'FilePermissions', 'FileType', 'FileTypeExtension',
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'MIMEType', 'ImageWidth', 'BitDepth', 'ColorType',
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'Compression', 'Filter', 'Interlace', 'BackgroundColor',
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'ImageSize', 'Megapixels', 'ImageHeight'}
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def __init__(self, filename):
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super().__init__(filename)
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if imghdr.what(filename) != 'png':
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raise ValueError
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try: # better fail here than later
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cairo.ImageSurface.create_from_png(self.filename)
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except MemoryError: # pragma: no cover
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raise ValueError
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def remove_all(self) -> bool:
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if self.lightweight_cleaning:
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return self._lightweight_cleanup()
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surface = cairo.ImageSurface.create_from_png(self.filename)
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surface.write_to_png(self.output_filename)
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return True
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class GdkPixbufAbstractParser(exiftool.ExiftoolParser):
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""" GdkPixbuf can handle a lot of surfaces, so we're rending images on it,
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this has the side-effect of completely removing metadata.
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"""
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_type = ''
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def __init__(self, filename):
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super().__init__(filename)
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if imghdr.what(filename) != self._type: # better safe than sorry
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raise ValueError
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def remove_all(self) -> bool:
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_, extension = os.path.splitext(self.filename)
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pixbuf = GdkPixbuf.Pixbuf.new_from_file(self.filename)
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if extension.lower() == '.jpg':
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extension = '.jpeg' # gdk is picky
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pixbuf.savev(self.output_filename, extension[1:], [], [])
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return True
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class JPGParser(GdkPixbufAbstractParser):
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_type = 'jpeg'
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mimetypes = {'image/jpeg'}
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meta_whitelist = {'SourceFile', 'ExifToolVersion', 'FileName',
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'Directory', 'FileSize', 'FileModifyDate',
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'FileAccessDate', "FileInodeChangeDate",
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'FilePermissions', 'FileType', 'FileTypeExtension',
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'MIMEType', 'ImageWidth', 'ImageSize', 'BitsPerSample',
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'ColorComponents', 'EncodingProcess', 'JFIFVersion',
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'ResolutionUnit', 'XResolution', 'YCbCrSubSampling',
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'YResolution', 'Megapixels', 'ImageHeight'}
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class TiffParser(GdkPixbufAbstractParser):
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_type = 'tiff'
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mimetypes = {'image/tiff'}
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meta_whitelist = {'Compression', 'ExifByteOrder', 'ExtraSamples',
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'FillOrder', 'PhotometricInterpretation',
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'PlanarConfiguration', 'RowsPerStrip', 'SamplesPerPixel',
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'StripByteCounts', 'StripOffsets', 'BitsPerSample',
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'Directory', 'ExifToolVersion', 'FileAccessDate',
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'FileInodeChangeDate', 'FileModifyDate', 'FileName',
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'FilePermissions', 'FileSize', 'FileType',
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'FileTypeExtension', 'ImageHeight', 'ImageSize',
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'ImageWidth', 'MIMEType', 'Megapixels', 'SourceFile'}
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