From df3c27d79dec231809deb4e617070a16858c306d Mon Sep 17 00:00:00 2001
From: jvoisin
Date: Sun, 18 Mar 2018 21:42:12 +0100
Subject: Improve the testsuite

---
 libmat2/__init__.py         |   1 +
 libmat2/parsers/__init__.py |   0
 libmat2/parsers/abstract.py |  10 +++++
 libmat2/parsers/pdf.py      | 105 ++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 116 insertions(+)
 create mode 100644 libmat2/__init__.py
 create mode 100644 libmat2/parsers/__init__.py
 create mode 100644 libmat2/parsers/abstract.py
 create mode 100644 libmat2/parsers/pdf.py

(limited to 'libmat2')

diff --git a/libmat2/__init__.py b/libmat2/__init__.py
new file mode 100644
index 0000000..3b3dacb
--- /dev/null
+++ b/libmat2/__init__.py
@@ -0,0 +1 @@
+__version__ = '2.0'
diff --git a/libmat2/parsers/__init__.py b/libmat2/parsers/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/libmat2/parsers/abstract.py b/libmat2/parsers/abstract.py
new file mode 100644
index 0000000..a9129cc
--- /dev/null
+++ b/libmat2/parsers/abstract.py
@@ -0,0 +1,10 @@
+class AbstractParser(object):
+    def __init__(self, filename: str):
+        self.filename = filename
+        self.meta_list = set()
+
+    def get_meta(self):
+        raise NotImplementedError
+
+    def remove_all(self):
+        raise NotImplementedError
diff --git a/libmat2/parsers/pdf.py b/libmat2/parsers/pdf.py
new file mode 100644
index 0000000..f6bc110
--- /dev/null
+++ b/libmat2/parsers/pdf.py
@@ -0,0 +1,105 @@
+""" Handle PDF
+
+"""
+
+import os
+import logging
+import tempfile
+import shutil
+import io
+
+import cairo
+import gi
+gi.require_version('Poppler', '0.18')
+from gi.repository import Poppler, Gio, GLib
+
+try:
+    from PIL import Image
+except ImportError:
+    Image = None
+
+from . import abstract
+
+logging.basicConfig(level=logging.DEBUG)
+
+
+class PDFParser(abstract.AbstractParser):
+    def __init__(self, filename):
+        super().__init__(filename)
+        self.meta_list = {'title', 'author', 'subject',
+            'keywords', 'creator', 'producer', 'metadata'}
+        self.uri = 'file://' + os.path.abspath(self.filename)
+        self.password = None
+
+    def remove_all(self):
+        """
+            Load the document into Poppler, render pages on PNG,
+            and shove those PNG into a new PDF. Metadata from the new
+            PDF are removed via Poppler, because there is no way to tell
+            cairo to not add "created by cairo" during rendering.
+
+            TODO: Improve the resolution
+            TODO: Don't use a temp file
+        """
+        document = Poppler.Document.new_from_file(self.uri, self.password)
+
+        pdf_out = io.BytesIO()
+        pdf_surface = cairo.PDFSurface(pdf_out, 128, 128)
+        pdf_context = cairo.Context(pdf_surface)
+
+        for pagenum in range(document.get_n_pages()):
+            page = document.get_page(pagenum)
+            page_width, page_height = page.get_size()
+            logging.info("Rendering page %d/%d", pagenum + 1, document.get_n_pages())
+
+            img_surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, int(page_width)*2, int(page_height)*2)
+            img_context = cairo.Context(img_surface)
+
+            img_context.scale(2, 2)
+            page.render_for_printing_with_options(img_context, Poppler.PrintFlags.DOCUMENT)
+            img_context.show_page()
+
+            buf = io.BytesIO()
+            img_surface.write_to_png(buf)
+            img_surface.finish()
+            buf.seek(0)
+
+            img = cairo.ImageSurface.create_from_png(buf)
+            pdf_surface.set_size(page_width*2, page_height*2)
+            pdf_context.set_source_surface(img, 0, 0)
+            pdf_context.paint()
+            pdf_context.show_page()
+
+        pdf_surface.finish()
+
+        b = GLib.Bytes(pdf_out.getvalue())
+        input_stream = Gio.MemoryInputStream.new_from_bytes(b)
+        out_document = Poppler.Document.new_from_stream(input_stream, -1, self.password, None)
+        metadata = {}
+        for key in self.meta_list:
+            if out_document.get_property(key):
+                metadata[key] = str(out_document.get_property(key))
+        out_document.set_producer('totally not MAT2 ;)')
+        out_document.set_creator('')
+        print("AFTER")
+        metadata = {}
+        for key in self.meta_list:
+            if out_document.get_property(key):
+                metadata[key] = str(out_document.get_property(key))
+        print("LOL")
+        out_document.save('file://' + os.path.abspath("olol.pdf"))
+
+        print(metadata)
+
+        return True
+
+    def get_meta(self):
+        """ Return a dict with all the meta of the file
+        """
+        print("URI: %s", self.uri)
+        document = Poppler.Document.new_from_file(self.uri, self.password)
+        metadata = {}
+        for key in self.meta_list:
+            if document.get_property(key):
+                metadata[key] = str(document.get_property(key))
+        return metadata
-- 
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