106 lines
3.3 KiB
Python
106 lines
3.3 KiB
Python
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""" Handle PDF
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"""
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import os
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import logging
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import tempfile
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import shutil
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import io
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import cairo
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import gi
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gi.require_version('Poppler', '0.18')
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from gi.repository import Poppler, Gio, GLib
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try:
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from PIL import Image
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except ImportError:
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Image = None
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from . import abstract
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logging.basicConfig(level=logging.DEBUG)
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class PDFParser(abstract.AbstractParser):
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def __init__(self, filename):
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super().__init__(filename)
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self.meta_list = {'title', 'author', 'subject',
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'keywords', 'creator', 'producer', 'metadata'}
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self.uri = 'file://' + os.path.abspath(self.filename)
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self.password = None
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def remove_all(self):
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"""
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Load the document into Poppler, render pages on PNG,
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and shove those PNG into a new PDF. Metadata from the new
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PDF are removed via Poppler, because there is no way to tell
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cairo to not add "created by cairo" during rendering.
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TODO: Improve the resolution
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TODO: Don't use a temp file
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"""
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document = Poppler.Document.new_from_file(self.uri, self.password)
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pdf_out = io.BytesIO()
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pdf_surface = cairo.PDFSurface(pdf_out, 128, 128)
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pdf_context = cairo.Context(pdf_surface)
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for pagenum in range(document.get_n_pages()):
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page = document.get_page(pagenum)
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page_width, page_height = page.get_size()
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logging.info("Rendering page %d/%d", pagenum + 1, document.get_n_pages())
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img_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, int(page_width)*2, int(page_height)*2)
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img_context = cairo.Context(img_surface)
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img_context.scale(2, 2)
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page.render_for_printing_with_options(img_context, Poppler.PrintFlags.DOCUMENT)
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img_context.show_page()
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buf = io.BytesIO()
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img_surface.write_to_png(buf)
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img_surface.finish()
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buf.seek(0)
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img = cairo.ImageSurface.create_from_png(buf)
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pdf_surface.set_size(page_width*2, page_height*2)
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pdf_context.set_source_surface(img, 0, 0)
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pdf_context.paint()
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pdf_context.show_page()
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pdf_surface.finish()
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b = GLib.Bytes(pdf_out.getvalue())
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input_stream = Gio.MemoryInputStream.new_from_bytes(b)
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out_document = Poppler.Document.new_from_stream(input_stream, -1, self.password, None)
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metadata = {}
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for key in self.meta_list:
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if out_document.get_property(key):
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metadata[key] = str(out_document.get_property(key))
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out_document.set_producer('totally not MAT2 ;)')
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out_document.set_creator('')
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print("AFTER")
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metadata = {}
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for key in self.meta_list:
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if out_document.get_property(key):
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metadata[key] = str(out_document.get_property(key))
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print("LOL")
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out_document.save('file://' + os.path.abspath("olol.pdf"))
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print(metadata)
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return True
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def get_meta(self):
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""" Return a dict with all the meta of the file
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"""
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print("URI: %s", self.uri)
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document = Poppler.Document.new_from_file(self.uri, self.password)
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metadata = {}
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for key in self.meta_list:
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if document.get_property(key):
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metadata[key] = str(document.get_property(key))
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return metadata
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