From 6202958048dd73af55b55e879317d583851fc2e3 Mon Sep 17 00:00:00 2001
From: Sachin Kelkar <sachinkel19@gmail.com>
Date: Mon, 30 Jan 2017 22:50:35 +0530
Subject: [PATCH] Add png parser

---
 mitmproxy/contentviews/__init__.py            |   5 +-
 mitmproxy/contentviews/image/__init__.py      |   0
 mitmproxy/contentviews/image/image_parser.py  |  34 +++
 .../{image.py => image/pillow.py}             |  12 +-
 mitmproxy/contentviews/image/png.py           | 257 ++++++++++++++++++
 test/mitmproxy/contentviews/test_image.py     |   4 +-
 .../contentviews/test_image_parser.py         |  14 +
 7 files changed, 320 insertions(+), 6 deletions(-)
 create mode 100644 mitmproxy/contentviews/image/__init__.py
 create mode 100644 mitmproxy/contentviews/image/image_parser.py
 rename mitmproxy/contentviews/{image.py => image/pillow.py} (75%)
 create mode 100644 mitmproxy/contentviews/image/png.py
 create mode 100644 test/mitmproxy/contentviews/test_image_parser.py

diff --git a/mitmproxy/contentviews/__init__.py b/mitmproxy/contentviews/__init__.py
index 357172e3e..b28f9d8f3 100644
--- a/mitmproxy/contentviews/__init__.py
+++ b/mitmproxy/contentviews/__init__.py
@@ -23,8 +23,9 @@ from mitmproxy.net import http
 from mitmproxy.utils import strutils
 from . import (
     auto, raw, hex, json, xml_html, html_outline, wbxml, javascript, css,
-    urlencoded, multipart, image, query, protobuf
+    urlencoded, multipart, query, protobuf
 )
+from .image import pillow
 from .base import View, VIEW_CUTOFF, KEY_MAX, format_text, format_dict
 
 views = []  # type: List[View]
@@ -170,7 +171,7 @@ add(javascript.ViewJavaScript())
 add(css.ViewCSS())
 add(urlencoded.ViewURLEncoded())
 add(multipart.ViewMultipart())
-add(image.ViewImage())
+add(pillow.ViewImage())
 add(query.ViewQuery())
 
 if protobuf.ViewProtobuf.is_available():
diff --git a/mitmproxy/contentviews/image/__init__.py b/mitmproxy/contentviews/image/__init__.py
new file mode 100644
index 000000000..e69de29bb
diff --git a/mitmproxy/contentviews/image/image_parser.py b/mitmproxy/contentviews/image/image_parser.py
new file mode 100644
index 000000000..8e5762c99
--- /dev/null
+++ b/mitmproxy/contentviews/image/image_parser.py
@@ -0,0 +1,34 @@
+from kaitaistruct import KaitaiStream
+
+from . import png
+
+def get_png(data):
+    img = png.Png(KaitaiStream(data))
+    parts = {'format': 'Portable network graphics'}
+    f = 'PNG'
+    width = img.ihdr.width
+    height = img.ihdr.height
+    parts["width"] = width
+    parts["height"] = height
+    for i in range(0, len(img.chunks)):
+        chunk = img.chunks[i]
+        if chunk.type == 'gAMA':
+            gamma = chunk.gamma_int / 100000
+            parts['gamma'] = gamma
+        elif chunk.type == 'pHYs':
+            aspectx = chunk.pixels_per_unit_x
+            aspecty = chunk.pixels_per_unit_y
+            parts["aspectx"] = aspectx
+            parts["aspecty"] = aspecty
+    return f, parts
+
+def format_contentviews(parts):
+    ret = []
+    ret.append(tuple(['Format', parts["format"]]))
+    if "width" in parts:
+        ret.append(tuple(['Size', str(parts["width"]) + " x " + str(parts["height"]) + " px"]))
+    if "aspectx" in parts:
+        ret.append(tuple(['aspect', '(' + str(parts["aspectx"]) + ', ' + str(parts["aspecty"]) + ')']))
+    if "gamma" in parts:
+        ret.append(tuple(['gamma', str(parts["gamma"])]))
+    return ret
diff --git a/mitmproxy/contentviews/image.py b/mitmproxy/contentviews/image/pillow.py
similarity index 75%
rename from mitmproxy/contentviews/image.py
rename to mitmproxy/contentviews/image/pillow.py
index 57b1fffb2..c48d665a7 100644
--- a/mitmproxy/contentviews/image.py
+++ b/mitmproxy/contentviews/image/pillow.py
@@ -1,10 +1,13 @@
-import io
+import io, imghdr
 
 from PIL import ExifTags
 from PIL import Image
 
 from mitmproxy.types import multidict
-from . import base
+from . import image_parser
+
+from mitmproxy.contentviews import base
+from kaitaistruct import KaitaiStream
 
 
 class ViewImage(base.View):
@@ -19,6 +22,11 @@ class ViewImage(base.View):
     ]
 
     def __call__(self, data, **metadata):
+        if imghdr.what('', h=data) == 'png':
+            f, parts = image_parser.get_png(io.BytesIO(data))
+            parts = image_parser.format_contentviews(parts)
+            fmt = base.format_dict(multidict.MultiDict(parts))
+            return "%s image" % f, fmt
         try:
             img = Image.open(io.BytesIO(data))
         except IOError:
diff --git a/mitmproxy/contentviews/image/png.py b/mitmproxy/contentviews/image/png.py
new file mode 100644
index 000000000..5996e3cee
--- /dev/null
+++ b/mitmproxy/contentviews/image/png.py
@@ -0,0 +1,257 @@
+# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
+# The source was png.ksy from here - https://github.com/kaitai-io/kaitai_struct_formats/tree/master/image
+
+import array
+import struct
+import zlib
+from enum import Enum
+
+from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO
+
+
+class Png(KaitaiStruct):
+
+    class ColorType(Enum):
+        greyscale = 0
+        truecolor = 2
+        indexed = 3
+        greyscale_alpha = 4
+        truecolor_alpha = 6
+
+    class PhysUnit(Enum):
+        unknown = 0
+        meter = 1
+    def __init__(self, _io, _parent=None, _root=None):
+        self._io = _io
+        self._parent = _parent
+        self._root = _root if _root else self
+        self.magic = self._io.ensure_fixed_contents(8, struct.pack('8b', -119, 80, 78, 71, 13, 10, 26, 10))
+        self.ihdr_len = self._io.ensure_fixed_contents(4, struct.pack('4b', 0, 0, 0, 13))
+        self.ihdr_type = self._io.ensure_fixed_contents(4, struct.pack('4b', 73, 72, 68, 82))
+        self.ihdr = self._root.IhdrChunk(self._io, self, self._root)
+        self.ihdr_crc = self._io.read_bytes(4)
+        self.chunks = []
+        while not self._io.is_eof():
+            self.chunks.append(self._root.Chunk(self._io, self, self._root))
+
+
+    class Rgb(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.r = self._io.read_u1()
+            self.g = self._io.read_u1()
+            self.b = self._io.read_u1()
+
+
+    class Chunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.len = self._io.read_u4be()
+            self.type = self._io.read_str_byte_limit(4, "UTF-8")
+            _on = self.type
+            if _on == u"gAMA":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.GamaChunk(io, self, self._root)
+            elif _on == u"tIME":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.TimeChunk(io, self, self._root)
+            elif _on == u"PLTE":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.PlteChunk(io, self, self._root)
+            elif _on == u"bKGD":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.BkgdChunk(io, self, self._root)
+            elif _on == u"pHYs":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.PhysChunk(io, self, self._root)
+            elif _on == u"tEXt":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.TextChunk(io, self, self._root)
+            elif _on == u"cHRM":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.ChrmChunk(io, self, self._root)
+            elif _on == u"sRGB":
+                self._raw_body = self._io.read_bytes(self.len)
+                io = KaitaiStream(BytesIO(self._raw_body))
+                self.body = self._root.SrgbChunk(io, self, self._root)
+            else:
+                self.body = self._io.read_bytes(self.len)
+            self.crc = self._io.read_bytes(4)
+
+
+    class BkgdIndexed(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.palette_index = self._io.read_u1()
+
+
+    class Point(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.x_int = self._io.read_u4be()
+            self.y_int = self._io.read_u4be()
+
+        @property
+        def x(self):
+            if hasattr(self, '_m_x'):
+                return self._m_x
+
+            self._m_x = (self.x_int / 100000.0)
+            return self._m_x
+
+        @property
+        def y(self):
+            if hasattr(self, '_m_y'):
+                return self._m_y
+
+            self._m_y = (self.y_int / 100000.0)
+            return self._m_y
+
+
+    class BkgdGreyscale(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.value = self._io.read_u2be()
+
+
+    class ChrmChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.white_point = self._root.Point(self._io, self, self._root)
+            self.red = self._root.Point(self._io, self, self._root)
+            self.green = self._root.Point(self._io, self, self._root)
+            self.blue = self._root.Point(self._io, self, self._root)
+
+
+    class IhdrChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.width = self._io.read_u4be()
+            self.height = self._io.read_u4be()
+            self.bit_depth = self._io.read_u1()
+            self.color_type = self._root.ColorType(self._io.read_u1())
+            self.compression_method = self._io.read_u1()
+            self.filter_method = self._io.read_u1()
+            self.interlace_method = self._io.read_u1()
+
+
+    class PlteChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.entries = []
+            while not self._io.is_eof():
+                self.entries.append(self._root.Rgb(self._io, self, self._root))
+
+
+
+    class SrgbChunk(KaitaiStruct):
+
+        class Intent(Enum):
+            perceptual = 0
+            relative_colorimetric = 1
+            saturation = 2
+            absolute_colorimetric = 3
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.render_intent = self._root.Intent(self._io.read_u1())
+
+
+    class BkgdTruecolor(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.red = self._io.read_u2be()
+            self.green = self._io.read_u2be()
+            self.blue = self._io.read_u2be()
+
+
+    class GamaChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.gamma_int = self._io.read_u4be()
+
+        @property
+        def gamma_ratio(self):
+            if hasattr(self, '_m_gamma_ratio'):
+                return self._m_gamma_ratio
+
+            self._m_gamma_ratio = (100000.0 / self.gamma_int)
+            return self._m_gamma_ratio
+
+
+    class BkgdChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            _on = self._root.ihdr.color_type
+            if _on == self._root.ColorType.greyscale_alpha:
+                self.bkgd = self._root.BkgdGreyscale(self._io, self, self._root)
+            elif _on == self._root.ColorType.indexed:
+                self.bkgd = self._root.BkgdIndexed(self._io, self, self._root)
+            elif _on == self._root.ColorType.greyscale:
+                self.bkgd = self._root.BkgdGreyscale(self._io, self, self._root)
+            elif _on == self._root.ColorType.truecolor_alpha:
+                self.bkgd = self._root.BkgdTruecolor(self._io, self, self._root)
+            elif _on == self._root.ColorType.truecolor:
+                self.bkgd = self._root.BkgdTruecolor(self._io, self, self._root)
+
+
+    class PhysChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.pixels_per_unit_x = self._io.read_u4be()
+            self.pixels_per_unit_y = self._io.read_u4be()
+            self.unit = self._root.PhysUnit(self._io.read_u1())
+
+
+    class TextChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.keyword = self._io.read_strz("iso8859-1", 0, False, True, True)
+            self.text = self._io.read_str_eos("iso8859-1")
+
+
+    class TimeChunk(KaitaiStruct):
+        def __init__(self, _io, _parent=None, _root=None):
+            self._io = _io
+            self._parent = _parent
+            self._root = _root if _root else self
+            self.year = self._io.read_u2be()
+            self.month = self._io.read_u1()
+            self.day = self._io.read_u1()
+            self.hour = self._io.read_u1()
+            self.minute = self._io.read_u1()
+            self.second = self._io.read_u1()
diff --git a/test/mitmproxy/contentviews/test_image.py b/test/mitmproxy/contentviews/test_image.py
index 9e7e28f56..000b9da55 100644
--- a/test/mitmproxy/contentviews/test_image.py
+++ b/test/mitmproxy/contentviews/test_image.py
@@ -1,10 +1,10 @@
-from mitmproxy.contentviews import image
+from mitmproxy.contentviews.image import pillow
 from mitmproxy.test import tutils
 from . import full_eval
 
 
 def test_view_image():
-    v = full_eval(image.ViewImage())
+    v = full_eval(pillow.ViewImage())
     for img in [
         "mitmproxy/data/image.png",
         "mitmproxy/data/image.gif",
diff --git a/test/mitmproxy/contentviews/test_image_parser.py b/test/mitmproxy/contentviews/test_image_parser.py
new file mode 100644
index 000000000..d41163927
--- /dev/null
+++ b/test/mitmproxy/contentviews/test_image_parser.py
@@ -0,0 +1,14 @@
+import io
+
+from mitmproxy.contentviews.image import image_parser
+from mitmproxy.test import tutils
+
+def test_png_parser():
+    img = "mitmproxy/data/image.png"
+    with open(tutils.test_data.path(img), "rb") as f:
+        fmt, parts = image_parser.get_png(io.BytesIO(f.read()))
+        assert fmt == "PNG"
+        assert parts
+        assert parts["width"] == 174
+        assert parts["height"] == 174
+        assert parts["format"] == "Portable network graphics"