Rename some files to simplify packaging

- the `src` folder is now `libmat2`
- the `main.py` script is now `mat2.py`

libmat2/images.py

@@ -0,0 +1,101 @@
+import subprocess
+import json
+import os
+
+import cairo
+
+import gi
+gi.require_version('GdkPixbuf', '2.0')
+from gi.repository import GdkPixbuf
+
+from . import abstract
+
+
+class PNGParser(abstract.AbstractParser):
+    mimetypes = {'image/png', }
+    meta_whitelist = {'SourceFile', 'ExifToolVersion', 'FileName',
+                      'Directory', 'FileSize', 'FileModifyDate',
+                      'FileAccessDate', 'FileInodeChangeDate',
+                      'FilePermissions', 'FileType', 'FileTypeExtension',
+                      'MIMEType', 'ImageWidth', 'BitDepth', 'ColorType',
+                      'Compression', 'Filter', 'Interlace', 'BackgroundColor',
+                      'ImageSize', 'Megapixels', 'ImageHeight'}
+
+    def __init__(self, filename):
+        super().__init__(filename)
+        try:  # better fail here than later
+            cairo.ImageSurface.create_from_png(self.filename)
+        except MemoryError:
+            raise ValueError
+
+    def get_meta(self):
+        out = subprocess.check_output(['/usr/bin/exiftool', '-json', self.filename])
+        meta = json.loads(out.decode('utf-8'))[0]
+        for key in self.meta_whitelist:
+            meta.pop(key, None)
+        return meta
+
+    def remove_all(self):
+        surface = cairo.ImageSurface.create_from_png(self.filename)
+        surface.write_to_png(self.output_filename)
+        return True
+
+
+class GdkPixbufAbstractParser(abstract.AbstractParser):
+    """ GdkPixbuf can handle a lot of surfaces, so we're rending images on it,
+        this has the side-effect of removing metadata completely.
+    """
+    def get_meta(self):
+        out = subprocess.check_output(['/usr/bin/exiftool', '-json', self.filename])
+        meta = json.loads(out.decode('utf-8'))[0]
+        for key in self.meta_whitelist:
+            meta.pop(key, None)
+        return meta
+
+    def remove_all(self):
+        _, extension = os.path.splitext(self.filename)
+        pixbuf = GdkPixbuf.Pixbuf.new_from_file(self.filename)
+        if extension == '.jpg':
+            extension = '.jpeg'
+        pixbuf.savev(self.output_filename, extension[1:], [], [])
+        return True
+
+
+class JPGParser(GdkPixbufAbstractParser):
+    mimetypes = {'image/jpeg'}
+    meta_whitelist = {'SourceFile', 'ExifToolVersion', 'FileName',
+                      'Directory', 'FileSize', 'FileModifyDate',
+                      'FileAccessDate', "FileInodeChangeDate",
+                      'FilePermissions', 'FileType', 'FileTypeExtension',
+                      'MIMEType', 'ImageWidth', 'ImageSize', 'BitsPerSample',
+                      'ColorComponents', 'EncodingProcess', 'JFIFVersion',
+                      'ResolutionUnit', 'XResolution', 'YCbCrSubSampling',
+                      'YResolution', 'Megapixels', 'ImageHeight'}
+
+
+class TiffParser(GdkPixbufAbstractParser):
+    mimetypes = {'image/tiff'}
+    meta_whitelist = {'Compression', 'ExifByteOrder', 'ExtraSamples',
+                      'FillOrder', 'PhotometricInterpretation',
+                      'PlanarConfiguration', 'RowsPerStrip', 'SamplesPerPixel',
+                      'StripByteCounts', 'StripOffsets', 'BitsPerSample',
+                      'Directory', 'ExifToolVersion', 'FileAccessDate',
+                      'FileInodeChangeDate', 'FileModifyDate', 'FileName',
+                      'FilePermissions', 'FileSize', 'FileType',
+                      'FileTypeExtension', 'ImageHeight', 'ImageSize',
+                      'ImageWidth', 'MIMEType', 'Megapixels', 'SourceFile'}
+
+
+class BMPParser(GdkPixbufAbstractParser):
+    mimetypes = {'image/x-ms-bmp'}
+    meta_whitelist = {'SourceFile', 'ExifToolVersion', 'FileName', 'Directory',
+                      'FileSize', 'FileModifyDate', 'FileAccessDate',
+                      'FileInodeChangeDate', 'FilePermissions', 'FileType',
+                      'FileTypeExtension', 'MIMEType', 'BMPVersion',
+                      'ImageWidth', 'ImageHeight', 'Planes', 'BitDepth',
+                      'Compression', 'ImageLength', 'PixelsPerMeterX',
+                      'PixelsPerMeterY', 'NumColors', 'NumImportantColors',
+                      'RedMask', 'GreenMask', 'BlueMask', 'AlphaMask',
+                      'ColorSpace', 'RedEndpoint', 'GreenEndpoint',
+                      'BlueEndpoint', 'GammaRed', 'GammaGreen', 'GammaBlue',
+                      'ImageSize', 'Megapixels'}