[ENH] Add WebhookMessage class

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "slackblocks"
-version = "1.0.2"
+version = "1.0.3"
 description = "Python wrapper for the Slack Blocks API"
 authors = [
     "Nicholas Lambourne <[email protected]>",

slackblocks/__init__.py

@@ -38,7 +38,9 @@
     WorkflowButton,
 )
 from .errors import InvalidUsageError
-from .messages import Message, MessageResponse
+from .messages import (
+    Message, MessageResponse, ResponseType, WebhookMessage
+)
 from .modals import Modal
 from .objects import (
     Confirm,

slackblocks/messages.py

@@ -5,13 +5,31 @@
 See: <https://api.slack.com/messaging>
 """
 
+from enum import Enum
 from json import dumps
 from typing import Any, Dict, List, Optional, Union
 
 from slackblocks.utils import coerce_to_list
 
 from .attachments import Attachment
 from .blocks import Block
+from .errors import InvalidUsageError
+
+
+class ResponseType(Enum):
+    """
+    Types of messages that can be sent via `WebhookMessage`.
+    """
+    EPHEMERAL = "ephemeral"
+    IN_CHANNEL = "in_channel"
+
+    @staticmethod
+    def get_value(value: Union["ResponseType", str]) -> str:
+        if isinstance(value, ResponseType):
+            return value.value
+        if value not in [response_type.value for response_type in ResponseType]:
+            raise InvalidUsageError("ResponseType must be either `ephemeral` or `in_channel`")
+        return value
 
 
 class BaseMessage:
@@ -75,7 +93,7 @@ class Message(BaseMessage):
     the Slack message API.
 
     Args:
-        channel:
+        channel: the Slack channel to send the message to, e.g. "#general".
         text: markdown text to send in the message. If `blocks` are provided
             then this is a fallback to display in notifications.
         blocks: a list of [`Blocks`](/reference/blocks) to form the contents
@@ -150,3 +168,100 @@ def _resolve(self) -> Dict[str, Any]:
         if self.ephemeral:
             result["response_type"] = "ephemeral"
         return result
+
+
+class WebhookMessage:
+    """
+    Messages sent via the Slack `WebhookClient` takes different arguments than 
+        those sent via the regular `WebClient`.
+
+    See: <https://github.com/slackapi/python-slack-sdk/blob/7e71b73/slack_sdk/webhook/client.py#L28>.
+    
+    Args:
+        text: markdown text to send in the message. If `blocks` are provided
+            then this is a fallback to display in notifications.
+        attachments: a list of
+            [`Attachments`](/reference/attachments/#attachments.Attachment)
+            that form the secondary contents of the message (deprecated).
+        blocks: a list of [`Blocks`](/reference/blocks) to form the contents
+            of the message instead of the contents of `text`.
+        response_type: one of `ResponseType.EPHEMERAL` or `ResponseType.IN_CHANNEL`.
+            Ephemeral messages are shown only to the requesting user whereas 
+            "in-channel" messages are shown to all channel participants.
+        replace_orginal: when `True`, the message triggering this response will be 
+            replaced by this messaage. Mutually exclusive with `delete_original`.
+        delete_original: when `True`, the original message triggering this response
+            will be deleted, and any content of this message will be posted as a
+            new message. Mutually exclusive with `replace_orginal`.
+        unfurl_links: if `True`, links in the message will be automatically
+            unfurled.
+        unfurl_media: if `True`, media from links (e.g. images) will
+            automatically unfurl.
+        metadata: additional metadata to attach to the message.
+        headres: HTTP request headers to include with the message.
+
+    Throws:
+        InvalidUsageError: when any of the passed fields fail validation.
+    """
+    def __init__(
+        self,
+        text: Optional[str] = None,
+        attachments: Optional[List[Attachment]] = None,
+        blocks: Optional[Union[List[Block], Block]] = None,
+        response_type: Union[ResponseType, str] = None,
+        replace_original: Optional[bool] = None,
+        delete_original: Optional[bool] = None,
+        unfurl_links: Optional[bool] = None,
+        unfurl_media: Optional[bool] = None,
+        metadata: Optional[Dict[str, Any]] = None,
+        headers: Optional[Dict[str, str]] = None,
+    ) -> "WebhookMessage":
+        self.text = text
+        self.attachments = coerce_to_list(attachments, Attachment, allow_none=True)
+        self.blocks = coerce_to_list(blocks, Block, allow_none=True)
+        self.response_type = ResponseType.get_value(response_type)
+        self.replace_original = replace_original
+        self.delete_original = delete_original
+        self.unfurl_links = unfurl_links
+        self.unfurl_media = unfurl_media
+        self.metadata = metadata
+        self.headers = headers
+
+    def _resolve(self) -> None:
+        webhook_message = {}
+        if self.text is not None:
+            webhook_message["text"] = self.text
+        if self.attachments is not None:
+            webhook_message["attachments"] = [attachment._resolve() for attachment in self.attachments]
+        if self.blocks is not None:
+            webhook_message["blocks"] = [block._resolve() for block in self.blocks]
+        if self.response_type is not None:
+            webhook_message["response_type"] = self.response_type
+        if self.replace_original is not None:
+            webhook_message["replace_original"] = self.replace_original
+        if self.delete_original is not None:
+            webhook_message["delete_original"] = self.delete_original
+        if self.unfurl_links is not None:
+            webhook_message["unfurl_links"] = self.unfurl_links
+        if self.unfurl_media is not None:
+            webhook_message["unfurl_media"] = self.unfurl_media
+        if self.metadata is not None:
+            webhook_message["metadata"] = self.metadata
+        if self.headers is not None:
+            webhook_message["headers"] = self.headers
+        return webhook_message
+
+    def to_dict(self) -> Dict[str, Any]:
+        return self._resolve()
+
+    def json(self) -> str:
+        return dumps(self._resolve(), indent=4)
+
+    def __repr__(self) -> str:
+        return self.json()
+
+    def __getitem__(self, item):
+        return self._resolve()[item]
+
+    def keys(self) -> Dict[str, Any]:
+        return self._resolve().keys()

test/samples/messages/webhook_message_basic.json

@@ -0,0 +1,27 @@
+{
+    "blocks": [
+        {
+            "type": "section",
+            "block_id": "fake_block_id",
+            "text": {
+                "type": "mrkdwn",
+                "text": "You wouldn't do ol' Hook in now, would you, lad?"
+            }
+        },
+        {
+            "type": "section",
+            "block_id": "fake_block_id",
+            "text": {
+                "type": "mrkdwn",
+                "text": "Well, all right... if you... say you're a codfish."
+            }
+        }
+    ],
+    "response_type": "ephemeral",
+    "replace_original": true,
+    "unfurl_links": false,
+    "unfurl_media": false,
+    "metadata": {
+        "sender": "Walt"
+    }
+}

test/samples/messages/webhook_message_delete.json

@@ -0,0 +1,41 @@
+{
+    "attachments": [
+        {
+            "blocks": [
+                {
+                    "type": "section",
+                    "block_id": "fake_block_id",
+                    "text": {
+                        "type": "mrkdwn",
+                        "text": "I'M A CODFISH!"
+                    }
+                }
+            ]
+        }
+    ],
+    "blocks": [
+        {
+            "type": "section",
+            "block_id": "fake_block_id",
+            "text": {
+                "type": "mrkdwn",
+                "text": "I'm a codfish."
+            }
+        },
+        {
+            "type": "section",
+            "block_id": "fake_block_id",
+            "text": {
+                "type": "mrkdwn",
+                "text": "Louder!"
+            }
+        }
+    ],
+    "response_type": "in_channel",
+    "delete_original": true,
+    "unfurl_links": true,
+    "unfurl_media": true,
+    "metadata": {
+        "sender": "Walt"
+    }
+}

test/unit/test_messages.py

@@ -1,4 +1,6 @@
-from slackblocks import Attachment, Color, Message, MessageResponse, SectionBlock
+from slackblocks import (
+    Attachment, Color, Message, MessageResponse, ResponseType, SectionBlock, Text, WebhookMessage
+) 
 
 
 def test_basic_message() -> None:
@@ -58,3 +60,61 @@ def test_to_dict() -> None:
         "replace_original": False,
         "response_type": "ephemeral",
     }
+
+
+def test_basic_webhook_message() -> None:
+    with open("test/samples/messages/webhook_message_basic.json", "r") as expected:
+        assert repr(
+            WebhookMessage(
+                blocks=[
+                    SectionBlock(
+                        Text("You wouldn't do ol' Hook in now, would you, lad?"),
+                        block_id="fake_block_id",
+                    ),
+                    SectionBlock(
+                        Text("Well, all right... if you... say you're a codfish."),
+                        block_id="fake_block_id",
+                    )
+                ],
+                response_type=ResponseType.EPHEMERAL,
+                replace_original=True,
+                unfurl_links=False,
+                unfurl_media=False,
+                metadata={
+                    "sender": "Walt",
+                }
+            )
+        ) == expected.read()
+
+
+def test_webhook_message_delete() -> None:
+    with open("test/samples/messages/webhook_message_delete.json", "r") as expected:
+        assert repr(
+            WebhookMessage(
+                attachments=[
+                    Attachment(blocks=[
+                        SectionBlock(
+                            Text("I'M A CODFISH!"),
+                            block_id="fake_block_id",
+                        )
+                    ])
+                ],
+                blocks=[
+                    SectionBlock(
+                        Text("I'm a codfish."),
+                        block_id="fake_block_id",
+                    ),
+                    SectionBlock(
+                        Text("Louder!"),
+                        block_id="fake_block_id",
+                    )
+                ],
+                response_type="in_channel",
+                delete_original=True,
+                unfurl_links=True,
+                unfurl_media=True,
+                metadata={
+                    "sender": "Walt",
+                }
+            )
+        ) == expected.read()