Body encoding sanitation, first pass.

- body/data type autodetection fixed.
- do not repr(body).encode() bytes-ish values.
- support __html__ and _repr_html_ in sanic.response.html().

sanic/response.py

@@ -23,6 +23,17 @@ except ImportError:
 
 class BaseHTTPResponse:
     def _encode_body(self, data):
+        # Replace the entire function with this once past deprecation:
+        # return data.encode() if hasattr(data, "encode") else data
+        # Deprecation fallbacks:
+        if hasattr(data, "encode"):
+            return data.encode()
+        try:
+            # Test if data is bytes-ish (implements the buffer protocol)
+            with memoryview(data):
+                return data
+        except TypeError:
+            # This is deprecated and quite b0rked (issue warning here?)
             return f"{data}".encode()
 
     def _parse_headers(self):
@@ -64,9 +75,8 @@ class StreamingHTTPResponse(BaseHTTPResponse):
     async def write(self, data):
         """Writes a chunk of data to the streaming response.
 
-        :param data: bytes-ish data to be written.
+        :param data: str or bytes-ish data to be written.
         """
-        if type(data) != bytes:
         data = self._encode_body(data)
 
         if self.chunked:
@@ -124,12 +134,7 @@ class HTTPResponse(BaseHTTPResponse):
         body_bytes=b"",
     ):
         self.content_type = content_type
-
+        self.body = body_bytes if body is None else self._encode_body(body)
-        if body is not None:
-            self.body = self._encode_body(body)
-        else:
-            self.body = body_bytes
-
         self.status = status
         self.headers = Header(headers or {})
         self._cookies = None
@@ -226,10 +231,14 @@ def html(body, status=200, headers=None):
     """
     Returns response object with body in html format.
 
-    :param body: Response data to be encoded.
+    :param body: str or bytes-ish, or an object with __html__ or _repr_html_.
     :param status: Response code.
     :param headers: Custom Headers.
     """
+    if hasattr(body, "__html__"):
+        body = body.__html__()
+    elif hasattr(body, "_repr_html_"):
+        body = body._repr_html_()
     return HTTPResponse(
         body,
         status=status,