Fix #312 Type hint errors with pytype 2021.4.26

.github/workflows/ci-build.yml

@@ -74,7 +74,7 @@ jobs:
         if [ ${python_version:7:3} == "3.8" ]; then
           pip install -e ".[async]"
           pip install -e ".[adapter]"
-          pip install "pytype==2021.4.15" && pytype slack_bolt/
+          pip install "pytype" && pytype slack_bolt/
         fi
     - name: Run all tests for codecov (3.9 only)
       run: |

slack_bolt/oauth/async_callback_options.py

@@ -91,8 +91,10 @@ def __init__(
             state_utils=state_utils,
             redirect_uri_page_renderer=redirect_uri_page_renderer,
         )
-        self.success = self._success_handler
-        self.failure = self._failure_handler
+        # Note that pytype 2021.4.26 misunderstands these assignments.
+        # Thus, we put "type: ignore" for the following two lines
+        self.success = self._success_handler  # type: ignore
+        self.failure = self._failure_handler  # type: ignore
 
     # --------------------------
     # Internal methods

slack_bolt/oauth/async_oauth_settings.py

@@ -103,12 +103,14 @@ def __init__(
             logger: The logger that will be used internally
         """
         # OAuth flow parameters/credentials
-        self.client_id = client_id or os.environ.get("SLACK_CLIENT_ID")
-        self.client_secret = client_secret or os.environ.get(
-            "SLACK_CLIENT_SECRET", None
+        client_id: Optional[str] = client_id or os.environ.get("SLACK_CLIENT_ID")
+        client_secret: Optional[str] = client_secret or os.environ.get(
+            "SLACK_CLIENT_SECRET"
         )
-        if self.client_id is None or self.client_secret is None:
+        if client_id is None or client_secret is None:
             raise BoltError("Both client_id and client_secret are required")
+        self.client_id = client_id
+        self.client_secret = client_secret
 
         self.scopes = scopes or os.environ.get("SLACK_SCOPES", "").split(",")
         if isinstance(self.scopes, str):

slack_bolt/oauth/oauth_settings.py

@@ -97,12 +97,14 @@ def __init__(
             state_expiration_seconds: The seconds that the state value is alive (Default: 600 seconds)
             logger: The logger that will be used internally
         """
-        self.client_id = client_id or os.environ.get("SLACK_CLIENT_ID")
-        self.client_secret = client_secret or os.environ.get(
-            "SLACK_CLIENT_SECRET", None
+        client_id: Optional[str] = client_id or os.environ.get("SLACK_CLIENT_ID")
+        client_secret: Optional[str] = client_secret or os.environ.get(
+            "SLACK_CLIENT_SECRET"
         )
-        if self.client_id is None or self.client_secret is None:
+        if client_id is None or client_secret is None:
             raise BoltError("Both client_id and client_secret are required")
+        self.client_id = client_id
+        self.client_secret = client_secret
 
         self.scopes = scopes or os.environ.get("SLACK_SCOPES", "").split(",")
         if isinstance(self.scopes, str):

slack_bolt/request/async_request.py

@@ -42,9 +42,21 @@ def __init__(
             context: The context in this request.
             mode: The mode used for this request. (either "http" or "socket_mode")
         """
-        if mode == "http" and not isinstance(body, str):
-            raise BoltError(error_message_raw_body_required_in_http_mode())
-        self.raw_body = body if mode == "http" else ""
+
+        if mode == "http":
+            # HTTP Mode
+            if not isinstance(body, str):
+                raise BoltError(error_message_raw_body_required_in_http_mode())
+            self.raw_body = body if body is not None else ""
+        else:
+            # Socket Mode
+            if body is not None and isinstance(body, str):
+                self.raw_body = body
+            else:
+                # We don't convert the dict value to str
+                # as doing so does not guarantee to keep the original structure/format.
+                self.raw_body = ""
+
         self.query = parse_query(query)
         self.headers = build_normalized_headers(headers)
         self.content_type = extract_content_type(self.headers)
@@ -57,7 +69,7 @@ def __init__(
         self.context = build_async_context(
             AsyncBoltContext(context if context else {}), self.body
         )
-        self.lazy_only = self.headers.get("x-slack-bolt-lazy-only", [False])[0]
+        self.lazy_only = bool(self.headers.get("x-slack-bolt-lazy-only", [False])[0])
         self.lazy_function_name = self.headers.get(
             "x-slack-bolt-lazy-function-name", [None]
         )[0]

slack_bolt/request/request.py

@@ -42,9 +42,20 @@ def __init__(
             context: The context in this request.
             mode: The mode used for this request. (either "http" or "socket_mode")
         """
-        if mode == "http" and not isinstance(body, str):
-            raise BoltError(error_message_raw_body_required_in_http_mode())
-        self.raw_body = body if mode == "http" else ""
+        if mode == "http":
+            # HTTP Mode
+            if not isinstance(body, str):
+                raise BoltError(error_message_raw_body_required_in_http_mode())
+            self.raw_body = body if body is not None else ""
+        else:
+            # Socket Mode
+            if body is not None and isinstance(body, str):
+                self.raw_body = body
+            else:
+                # We don't convert the dict value to str
+                # as doing so does not guarantee to keep the original structure/format.
+                self.raw_body = ""
+
         self.query = parse_query(query)
         self.headers = build_normalized_headers(headers)
         self.content_type = extract_content_type(self.headers)
@@ -56,7 +67,7 @@ def __init__(
             raise BoltError(error_message_unknown_request_body_type())
 
         self.context = build_context(BoltContext(context if context else {}), self.body)
-        self.lazy_only = self.headers.get("x-slack-bolt-lazy-only", [False])[0]
+        self.lazy_only = bool(self.headers.get("x-slack-bolt-lazy-only", [False])[0])
         self.lazy_function_name = self.headers.get(
             "x-slack-bolt-lazy-function-name", [None]
         )[0]