fix cached precompiler for unicode input

compressor/cache.py

@@ -136,7 +136,7 @@ def get_hashed_content(filename, length=12):
 
 
 def get_precompiler_cachekey(command, contents):
-    return hashlib.sha1('precompiler.%s.%s' % (command, contents)).hexdigest()
+    return hashlib.sha1(smart_bytes('precompiler.%s.%s' % (command, contents))).hexdigest()
 
 
 def cache_get(key):

compressor/filters/base.py

@@ -233,4 +233,4 @@ class CachedCompilerFilter(CompilerFilter):
             return super(CachedCompilerFilter, self).input(**kwargs)
 
     def get_cache_key(self):
-        return get_precompiler_cachekey(self.command, self.content.encode('utf8'))
+        return get_precompiler_cachekey(self.command, self.content)

compressor/tests/test_base.py

@@ -14,7 +14,7 @@ from django.test.utils import override_settings
 
 from compressor import cache as cachemod
 from compressor.base import SOURCE_FILE, SOURCE_HUNK
-from compressor.cache import get_cachekey
+from compressor.cache import get_cachekey, get_precompiler_cachekey
 from compressor.conf import settings
 from compressor.css import CssCompressor
 from compressor.exceptions import FilterDoesNotExist, FilterError
@@ -331,3 +331,9 @@ class CacheTestCase(SimpleTestCase):
     @override_settings(COMPRESS_CACHE_KEY_FUNCTION='invalid.module')
     def test_get_cachekey_invalid_mod(self):
         self.assertRaises(ImportError, lambda: get_cachekey("foo"))
+
+    def test_get_precompiler_cachekey(self):
+        try:
+            get_precompiler_cachekey("asdf", "asdf")
+        except TypeError:
+            self.fail("get_precompiler_cachekey raised TypeError unexpectedly")