53 lines
1.5 KiB
Python
53 lines
1.5 KiB
Python
# -*- coding: utf-8 -*-
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from copy import copy
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from ..parser import parse_content
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from ..eraser import remove_object_by_id
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from ..plugin import Plugin
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class SPIE(Plugin):
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"""
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Society of Photo-Optical Instrumentation Engineers
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~~~~~~~~~~~~~~~
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These watermarks are shown on each page, but are only defined in one place.
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Also, there seems to be some interference from some of the other
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pdfparanoia plugins causing the deletion of images in the document.
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Side-effects need to be better accounted for.
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"""
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@staticmethod
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def scrub(content):
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evil_ids = []
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# parse the pdf into a pdfminer document
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pdf = parse_content(content)
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# get a list of all object ids
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xrefs = pdf._parser.read_xref()
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xref = xrefs[0]
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objids = xref.get_objids()
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# check each object in the pdf
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for objid in objids:
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# get an object by id
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obj = pdf.getobj(objid)
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if hasattr(obj, "attrs"):
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# watermarks tend to be in FlateDecode elements
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if obj.attrs.has_key("Filter") and str(obj.attrs["Filter"]) == "/FlateDecode":
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data = copy(obj.get_data())
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if "Downloaded From:" in data:
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evil_ids.append(objid)
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for objid in evil_ids:
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# for some reason SPIE pdfs are broken by this, images are randomly removed
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#content = remove_object_by_id(content, objid)
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continue
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return content
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