118 lines
4.8 KiB
Python
118 lines
4.8 KiB
Python
import subprocess
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import json
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import os
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import shutil
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import tempfile
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import re
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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 abstract
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class __ImageParser(abstract.AbstractParser):
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@staticmethod
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def __handle_problematic_filename(filename:str, callback) -> str:
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""" This method takes a filename with a problematic name,
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and safely applies it a `callback`."""
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tmpdirname = tempfile.mkdtemp()
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fname = os.path.join(tmpdirname, "temp_file")
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shutil.copy(filename, fname)
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out = callback(fname)
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shutil.rmtree(tmpdirname)
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return out
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def get_meta(self):
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""" There is no way to escape the leading(s) dash(es) of the current
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self.filename to prevent parameter injections, so we need to take care
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of this.
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"""
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fun = lambda f: subprocess.check_output(['/usr/bin/exiftool', '-json', f])
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if re.search('^[a-z0-9/]', self.filename) is None:
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out = self.__handle_problematic_filename(self.filename, fun)
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else:
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out = fun(self.filename)
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meta = json.loads(out.decode('utf-8'))[0]
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for key in self.meta_whitelist:
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meta.pop(key, None)
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return meta
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class PNGParser(__ImageParser):
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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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try: # better fail here than later
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cairo.ImageSurface.create_from_png(self.filename)
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except MemoryError:
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raise ValueError
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def remove_all(self):
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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(__ImageParser):
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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 removing metadata completely.
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"""
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def remove_all(self):
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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 == '.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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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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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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class BMPParser(GdkPixbufAbstractParser):
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mimetypes = {'image/x-ms-bmp'}
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meta_whitelist = {'SourceFile', 'ExifToolVersion', 'FileName', 'Directory',
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'FileSize', 'FileModifyDate', 'FileAccessDate',
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'FileInodeChangeDate', 'FilePermissions', 'FileType',
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'FileTypeExtension', 'MIMEType', 'BMPVersion',
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'ImageWidth', 'ImageHeight', 'Planes', 'BitDepth',
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'Compression', 'ImageLength', 'PixelsPerMeterX',
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'PixelsPerMeterY', 'NumColors', 'NumImportantColors',
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'RedMask', 'GreenMask', 'BlueMask', 'AlphaMask',
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'ColorSpace', 'RedEndpoint', 'GreenEndpoint',
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'BlueEndpoint', 'GammaRed', 'GammaGreen', 'GammaBlue',
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'ImageSize', 'Megapixels'}
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