Add a msgpack content viewer.

CHANGELOG

@@ -2,6 +2,8 @@ Unreleased: mitmproxy next
 
 ** Full Changelog **
 
+    * Add MsgPack content viewer (@tasn)
+
     * --- TODO: add new PRs above this line ---
 
     * ... and various other fixes, documentation improvements, dependency version bumps, etc.

mitmproxy/contentviews/__init__.py

@@ -22,7 +22,7 @@ from mitmproxy.net import http
 from mitmproxy.utils import strutils
 from . import (
     auto, raw, hex, json, xml_html, wbxml, javascript, css,
-    urlencoded, multipart, image, query, protobuf
+    urlencoded, multipart, image, query, protobuf, msgpack
 )
 from .base import View, KEY_MAX, format_text, format_dict, TViewResult
 
@@ -175,6 +175,7 @@ add(multipart.ViewMultipart())
 add(image.ViewImage())
 add(query.ViewQuery())
 add(protobuf.ViewProtobuf())
+add(msgpack.ViewMsgPack())
 
 __all__ = [
     "View", "KEY_MAX", "format_text", "format_dict", "TViewResult",

mitmproxy/contentviews/msgpack.py

@@ -0,0 +1,36 @@
+import pprint
+import re
+import typing
+
+import msgpack
+
+
+from mitmproxy.contentviews import base
+
+PARSE_ERROR = object()
+
+
+def parse_msgpack(s: bytes) -> typing.Any:
+    try:
+        return msgpack.unpackb(s, raw=False)
+    except (ValueError, msgpack.ExtraData, msgpack.FormatError, msgpack.StackError):
+        return PARSE_ERROR
+
+
+def format_msgpack(data):
+    current_line: base.TViewLine = []
+    current_line.append(("text", pprint.pformat(data, indent=4)))
+    yield current_line
+
+
+class ViewMsgPack(base.View):
+    name = "MsgPack"
+    content_types = [
+        "application/msgpack",
+        "application/x-msgpack",
+    ]
+
+    def __call__(self, data, **metadata):
+        data = parse_msgpack(data)
+        if data is not PARSE_ERROR:
+            return "MsgPack", format_msgpack(data)

setup.py

@@ -71,6 +71,7 @@ setup(
         "hyperframe>=5.1.0,<6",
         "kaitaistruct>=0.7,<0.9",
         "ldap3>=2.6.1,<2.8",
+        "msgpack>=1.0.0, <1.1.0",
         "passlib>=1.6.5, <1.8",
         "protobuf>=3.6.0, <3.12",
         "pyasn1>=0.3.1,<0.5",

test/mitmproxy/contentviews/test_msgpack.py

@@ -0,0 +1,46 @@
+from hypothesis import given
+from hypothesis.strategies import binary
+
+from msgpack import packb
+
+from mitmproxy.contentviews import msgpack
+from . import full_eval
+
+
+def msgpack_encode(content):
+    return packb(content, use_bin_type=True)
+
+
+def test_parse_msgpack():
+    assert msgpack.parse_msgpack(msgpack_encode({"foo": 1}))
+    assert msgpack.parse_msgpack(b"aoesuteoahu") is msgpack.PARSE_ERROR
+    assert msgpack.parse_msgpack(msgpack_encode({"foo": "\xe4\xb8\x96\xe7\x95\x8c"}))
+
+
+def test_format_msgpack():
+    assert list(msgpack.format_msgpack({
+        "data": [
+            "str",
+            42,
+            True,
+            False,
+            None,
+            {},
+            []
+        ]
+    }))
+
+
+def test_view_msgpack():
+    v = full_eval(msgpack.ViewMsgPack())
+    assert v(msgpack_encode({}))
+    assert not v(b"aoesuteoahu")
+    assert v(msgpack_encode([1, 2, 3, 4, 5]))
+    assert v(msgpack_encode({"foo": 3}))
+    assert v(msgpack_encode({"foo": True, "nullvalue": None}))
+
+
+@given(binary())
+def test_view_msgpack_doesnt_crash(data):
+    v = full_eval(msgpack.ViewMsgPack())
+    v(data)