bump hyperframe and fix protocol error (#1238)

3 files changed, 20 insertions, 33 deletions

diff --git a/src/h2/connection.py b/src/h2/connection.py
index 7cf451a..aa30711 100644
--- a/src/h2/connection.py
+++ b/src/h2/connection.py
@@ -1721,12 +1721,8 @@ class H2Connection:
         """
         Receive a WINDOW_UPDATE frame on the connection.
         """
-        # Validate the frame.
-        if not (1 <= frame.window_increment <= self.MAX_WINDOW_INCREMENT):
-            raise ProtocolError(
-                "Flow control increment must be between 1 and %d, received %d"
-                % (self.MAX_WINDOW_INCREMENT, frame.window_increment)
-            )
+        # hyperframe will take care of validating the window_increment.
+        # If we reach in here, we can assume a valid value.
 
         events = self.state_machine.process_input(
             ConnectionInputs.RECV_WINDOW_UPDATE
diff --git a/src/h2/exceptions.py b/src/h2/exceptions.py
index 388f9e9..e22bebc 100644
--- a/src/h2/exceptions.py
+++ b/src/h2/exceptions.py
@@ -26,7 +26,7 @@ class FrameTooLargeError(ProtocolError):
     """
     The frame that we tried to send or that we received was too large.
     """
-    #: This error code that corresponds to this kind of Protocol Error.
+    #: The error code corresponds to this kind of Protocol Error.
     error_code = h2.errors.ErrorCodes.FRAME_SIZE_ERROR
 
 
@@ -36,7 +36,7 @@ class FrameDataMissingError(ProtocolError):
 
     .. versionadded:: 2.0.0
     """
-    #: The error code that corresponds to this kind of Protocol Error
+    #: The error code corresponds to this kind of Protocol Error.
     error_code = h2.errors.ErrorCodes.FRAME_SIZE_ERROR
 
 
@@ -52,8 +52,7 @@ class FlowControlError(ProtocolError):
     """
     An attempted action violates flow control constraints.
     """
-    #: The error code that corresponds to this kind of
-    #: :class:`ProtocolError <h2.exceptions.ProtocolError>`
+    #: The error code corresponds to this kind of Protocol Error.
     error_code = h2.errors.ErrorCodes.FLOW_CONTROL_ERROR
 
 
@@ -94,7 +93,7 @@ class NoSuchStreamError(ProtocolError):
        <h2.exceptions.ProtocolError>`
     """
     def __init__(self, stream_id):
-        #: The stream ID that corresponds to the non-existent stream.
+        #: The stream ID corresponds to the non-existent stream.
         self.stream_id = stream_id
 
 
@@ -106,7 +105,7 @@ class StreamClosedError(NoSuchStreamError):
     stream has been removed.
     """
     def __init__(self, stream_id):
-        #: The stream ID that corresponds to the nonexistent stream.
+        #: The stream ID corresponds to the nonexistent stream.
         self.stream_id = stream_id
 
         #: The relevant HTTP/2 error code.
@@ -145,13 +144,15 @@ class InvalidBodyLengthError(ProtocolError):
         )
 
 
-class UnsupportedFrameError(ProtocolError, KeyError):
+class UnsupportedFrameError(ProtocolError):
     """
     The remote peer sent a frame that is unsupported in this context.
 
     .. versionadded:: 2.1.0
+
+    .. versionchanged:: 4.0.0
+       Removed deprecated KeyError parent class.
     """
-    # TODO: Remove the KeyError in 3.0.0
     pass
 
 
@@ -181,6 +182,6 @@ class DenialOfServiceError(ProtocolError):
 
     .. versionadded:: 2.5.0
     """
-    #: The error code that corresponds to this kind of
+    #: The error code corresponds to this kind of
     #: :class:`ProtocolError <h2.exceptions.ProtocolError>`
     error_code = h2.errors.ErrorCodes.ENHANCE_YOUR_CALM
diff --git a/src/h2/frame_buffer.py b/src/h2/frame_buffer.py
index 9ca0fe4..785775e 100644
--- a/src/h2/frame_buffer.py
+++ b/src/h2/frame_buffer.py
@@ -6,7 +6,7 @@ h2/frame_buffer
 A data structure that provides a way to iterate over a byte buffer in terms of
 frames.
 """
-from hyperframe.exceptions import InvalidFrameError
+from hyperframe.exceptions import InvalidFrameError, InvalidDataError
 from hyperframe.frame import (
     Frame, HeadersFrame, ContinuationFrame, PushPromiseFrame
 )
@@ -57,20 +57,6 @@ class FrameBuffer:
 
         self.data += data
 
-    def _parse_frame_header(self, data):
-        """
-        Parses the frame header from the data. Either returns a tuple of
-        (frame, length), or throws an exception. The returned frame may be None
-        if the frame is of unknown type.
-        """
-        try:
-            frame, length = Frame.parse_frame_header(data[:9])
-        except ValueError as e:
-            # The frame header is invalid. This is a ProtocolError
-            raise ProtocolError("Invalid frame header received: %s" % str(e))
-
-        return frame, length
-
     def _validate_frame_length(self, length):
         """
         Confirm that the frame is an appropriate length.
@@ -137,9 +123,11 @@ class FrameBuffer:
             raise StopIteration()
 
         try:
-            f, length = self._parse_frame_header(self.data)
-        except InvalidFrameError:  # pragma: no cover
-            raise ProtocolError("Received frame with invalid frame header.")
+            f, length = Frame.parse_frame_header(self.data[:9])
+        except (InvalidDataError, InvalidFrameError) as e:  # pragma: no cover
+            raise ProtocolError(
+                "Received frame with invalid header: %s" % str(e)
+            )
 
         # Next, check that we have enough length to parse the frame body. If
         # not, bail, leaving the frame header data in the buffer for next time.
@@ -152,6 +140,8 @@ class FrameBuffer:
         # Try to parse the frame body
         try:
             f.parse_body(memoryview(self.data[9:9+length]))
+        except InvalidDataError:
+            raise ProtocolError("Received frame with non-compliant data")
         except InvalidFrameError:
             raise FrameDataMissingError("Frame data missing or invalid")