From 0aa67c67faaaf4c9531b0440706673d0a859f39b Mon Sep 17 00:00:00 2001
From: Anthony Sottile <asottile@umich.edu>
Date: Thu, 10 Dec 2015 11:05:38 -0800
Subject: [PATCH] Disallow arbitrary kwargs in compile()

---
 sass.py      | 15 ++++++++++++++-
 sasstests.py | 34 +++++++++++++++++++++++++++++-----
 2 files changed, 43 insertions(+), 6 deletions(-)

diff --git a/sass.py b/sass.py
index bf2498fd..b98a4b34 100644
--- a/sass.py
+++ b/sass.py
@@ -176,6 +176,16 @@ def compile_dirname(
     return True, None
 
 
+def _check_no_remaining_kwargs(func, kwargs):
+    if kwargs:
+        raise TypeError(
+            '{0}() got unexpected keyword argument(s) {1}'.format(
+                func.__name__,
+                ', '.join("'{0}'".format(arg) for arg in sorted(kwargs)),
+            )
+        )
+
+
 def compile(**kwargs):
     """There are three modes of parameters :func:`compile()` can take:
     ``string``, ``filename``, and ``dirname``.
@@ -456,9 +466,10 @@ def func_name(a, b):
         if not isinstance(indented, bool):
             raise TypeError('indented must be bool, not ' +
                             repr(source_comments))
+        _check_no_remaining_kwargs(compile, kwargs)
         s, v = compile_string(
             string, output_style, source_comments, include_paths, precision,
-            custom_functions, indented
+            custom_functions, indented,
         )
         if s:
             return v.decode('utf-8')
@@ -470,6 +481,7 @@ def func_name(a, b):
             raise IOError('{0!r} seems not a file'.format(filename))
         elif isinstance(filename, text_type):
             filename = filename.encode(fs_encoding)
+        _check_no_remaining_kwargs(compile, kwargs)
         s, v, source_map = compile_filename(
             filename, output_style, source_comments, include_paths, precision,
             source_map_filename, custom_functions,
@@ -515,6 +527,7 @@ def func_name(a, b):
         except ValueError:
             raise ValueError('dirname must be a pair of (source_dir, '
                              'output_dir)')
+        _check_no_remaining_kwargs(compile, kwargs)
         s, v = compile_dirname(
             search_path, output_path, output_style, source_comments,
             include_paths, precision, custom_functions,
diff --git a/sasstests.py b/sasstests.py
index 3829e618..c16402e0 100644
--- a/sasstests.py
+++ b/sasstests.py
@@ -224,6 +224,19 @@ def test_compile_invalid_source_comments(self):
                           string='a { color: blue; }',
                           source_comments='invalid')
 
+    def test_compile_disallows_arbitrary_arguments(self):
+        for args in (
+                {'string': 'a{b:c}'},
+                {'filename': 'test/a.scss'},
+                {'dirname': ('test', '/dev/null')},
+        ):
+            with assert_raises(TypeError) as excinfo:
+                sass.compile(herp='derp', harp='darp', **args)
+            msg, = excinfo.value.args
+            assert msg == (
+                "compile() got unexpected keyword argument(s) 'harp', 'herp'"
+            )
+
     def test_compile_string(self):
         actual = sass.compile(string='a { b { color: blue; } }')
         assert actual == 'a b {\n  color: blue; }\n'
@@ -1023,13 +1036,24 @@ def compile_with_func(s):
 
 
 @contextlib.contextmanager
-def assert_raises_compile_error(expected):
+def assert_raises(exctype):
+    # I want pytest.raises, this'll have to do for now
+    class C:
+        pass
+
     try:
-        yield
+        yield C
         assert False, 'Expected to raise!'
-    except sass.CompileError as e:
-        msg, = e.args
-        assert msg.decode('UTF-8') == expected, (msg, expected)
+    except exctype as e:
+        C.value = e
+
+
+@contextlib.contextmanager
+def assert_raises_compile_error(expected):
+    with assert_raises(sass.CompileError) as excinfo:
+        yield
+    msg, = excinfo.value.args
+    assert msg.decode('UTF-8') == expected, (msg, expected)
 
 
 class RegexMatcher(object):