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import subprocess
import json
import os
import shutil
import tempfile
import cairo
import gi
gi.require_version('GdkPixbuf', '2.0')
from gi.repository import GdkPixbuf
from . import abstract
class __ImageParser(abstract.AbstractParser):
def get_meta(self):
""" There is no way to escape the leading(s) dash(es) of the current
self.filename to prevent parameter injections, so we do have to copy it
"""
fname = self.filename
tmpdirname = ""
if self.filename.startswith('-'):
tmpdirname = tempfile.mkdtemp()
fname = os.path.join(tmpdirname, self.filename)
shutil.copy(self.filename, fname)
out = subprocess.check_output(['/usr/bin/exiftool', '-json', fname])
if self.filename.startswith('-'):
shutil.rmtree(tmpdirname)
meta = json.loads(out.decode('utf-8'))[0]
for key in self.meta_whitelist:
meta.pop(key, None)
return meta
class PNGParser(__ImageParser):
mimetypes = {'image/png', }
meta_whitelist = {'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)
try: # better fail here than later
cairo.ImageSurface.create_from_png(self.filename)
except MemoryError:
raise ValueError
def remove_all(self):
surface = cairo.ImageSurface.create_from_png(self.filename)
surface.write_to_png(self.output_filename)
return True
class GdkPixbufAbstractParser(__ImageParser):
""" GdkPixbuf can handle a lot of surfaces, so we're rending images on it,
this has the side-effect of removing metadata completely.
"""
def remove_all(self):
_, extension = os.path.splitext(self.filename)
pixbuf = GdkPixbuf.Pixbuf.new_from_file(self.filename)
if extension == '.jpg':
extension = '.jpeg'
pixbuf.savev(self.output_filename, extension[1:], [], [])
return True
class JPGParser(GdkPixbufAbstractParser):
mimetypes = {'image/jpeg'}
meta_whitelist = {'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):
mimetypes = {'image/tiff'}
meta_whitelist = {'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'}
class BMPParser(GdkPixbufAbstractParser):
mimetypes = {'image/x-ms-bmp'}
meta_whitelist = {'SourceFile', 'ExifToolVersion', 'FileName', 'Directory',
'FileSize', 'FileModifyDate', 'FileAccessDate',
'FileInodeChangeDate', 'FilePermissions', 'FileType',
'FileTypeExtension', 'MIMEType', 'BMPVersion',
'ImageWidth', 'ImageHeight', 'Planes', 'BitDepth',
'Compression', 'ImageLength', 'PixelsPerMeterX',
'PixelsPerMeterY', 'NumColors', 'NumImportantColors',
'RedMask', 'GreenMask', 'BlueMask', 'AlphaMask',
'ColorSpace', 'RedEndpoint', 'GreenEndpoint',
'BlueEndpoint', 'GammaRed', 'GammaGreen', 'GammaBlue',
'ImageSize', 'Megapixels'}
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