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'''
Care about images with help of the amazing (perl) library Exiftool.
'''
import subprocess
import parser
import shutil
class ExiftoolStripper(parser.GenericParser):
'''
A generic stripper class using exiftool as backend
'''
def __init__(self, filename, parser, mime, backup, **kwargs):
super(ExiftoolStripper, self).__init__(filename, parser, mime, backup, **kwargs)
self.allowed = ['ExifTool Version Number', 'File Name', 'Directory',
'File Size', 'File Modification Date/Time', 'File Access Date/Time', 'File Permissions',
'File Type', 'MIME Type', 'Image Width', 'Image Height',
'Image Size']
self._set_allowed()
def _set_allowed(self):
'''
Set the allowed/harmless list of metadata
'''
raise NotImplementedError
def remove_all(self):
'''
Remove all metadata with help of exiftool
'''
try:
if self.backup:
self.create_backup_copy()
# Note: '-All=' must be followed by a known exiftool option.
process = subprocess.Popen( ['exiftool', '-m', '-all=',
'-adobe=', '-overwrite_original', self.filename ],
stdout=open('/dev/null'))
process.wait()
return True
except:
return False
def is_clean(self):
'''
Check if the file is clean with help of exiftool
'''
out = subprocess.Popen(['exiftool', self.filename],
stdout=subprocess.PIPE).communicate()[0]
out = out.split('\n')
for i in out[:-1]:
if i.split(':')[0].strip() not in self.allowed:
return False
return True
def get_meta(self):
'''
Return every harmful meta with help of exiftool.
Exiftool output looks like this:
field name : value
field name : value
'''
out = subprocess.Popen(['exiftool', self.filename],
stdout=subprocess.PIPE).communicate()[0]
out = out.split('\n')
meta = {}
for i in out[:-1]:
key = i.split(':')[0].strip()
if key not in self.allowed:
meta[key] = i.split(':')[1].strip() # add the field name to the metadata set
return meta
class JpegStripper(ExiftoolStripper):
'''
Care about jpeg files with help
of exiftool
'''
def _set_allowed(self):
self.allowed.extend(['JFIF Version', 'Resolution Unit',
'X Resolution', 'Y Resolution', 'Encoding Process', 'Bits Per Sample',
'Color Components', 'Y Cb Cr Sub Sampling'])
class PngStripper(ExiftoolStripper):
'''
Care about png files with help
of exiftool
'''
def _set_allowed(self):
self.allowed.extend(['Bit Depth', 'Color Type', 'Compression',
'Filter', 'Interlace', 'Pixels Per Unit X', 'Pixels Per Unit Y',
'Pixel Units', 'Significant Bits' ,'Background Color',
'SRGB Rendering',])
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