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'''
Parent class of all parser
'''
import hachoir_core.error
import hachoir_parser
import hachoir_metadata
import hachoir_editor
import sys
POSTFIX = ".cleaned"
class Generic_parser():
def __init__(self, realname, filename, parser, editor):
self.meta = {}
self.filename = filename
self.realname = realname
self.parser = parser
self.editor = editor
self.meta = self.__fill_meta()
def __fill_meta(self):
metadata = {}
try:
meta = hachoir_metadata.extractMetadata(self.parser)
except hachoir_core.error.HachoirError, err:
print("Metadata extraction error: %s" % err)
if not meta:
print("Unable to extract metadata from the file %s" % self.filename)
sys.exit(1)
for title in meta:
#fixme i'm so dirty
if title.values != []: #if the field is not empty
value = ""
for item in title.values:
value = item.text
metadata[title.key] = value
return metadata
def is_clean(self):
'''
Check if the file is clean from harmful metadatas
'''
for field in self.editor:
if self._should_remove(field):
return False
return True
def remove_all(self):
'''
Remove all the files that are compromizing
'''
for field in self.editor:
if self._should_remove(field):
self._remove(field)
hachoir_core.field.writeIntoFile(self.editor, self.filename + POSTFIX)
def _remove(self, field):
'''
Remove the given field
'''
del self.editor[field.name]
def get_meta(self):
'''
return a dict with all the meta of the file
'''
metadata = []
for field in self.editor:
if self._should_remove(field):
metadata.append(field.name)
return metadata
def _should_remove(self, key):
'''
return True if the field is compromizing
abstract method
'''
raise NotImplementedError()
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