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import subprocess
import json
import cairo
from . import abstract
class PNGParser(abstract.AbstractParser):
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 get_meta(self):
out = subprocess.check_output(['exiftool', '-json', self.filename])
meta = json.loads(out.decode('utf-8'))[0]
for key in self.meta_whitelist:
meta.pop(key, None)
return meta
def remove_all(self):
surface = cairo.ImageSurface.create_from_png(self.filename)
surface.write_to_png(self.output_filename)
return True
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