feat(blocks): add Card, Carousel, and Alert block types (#1865)

Co-authored-by: Eden Zimbelman <eden.zimbelman@salesforce.com>

Author: srtaalej

slack_sdk/models/blocks/__init__.py

@@ -61,8 +61,11 @@
 )
 from .blocks import (
     ActionsBlock,
+    AlertBlock,
     Block,
     CallBlock,
+    CardBlock,
+    CarouselBlock,
     ContextActionsBlock,
     ContextBlock,
     DividerBlock,
@@ -129,8 +132,11 @@
     "RichTextQuoteElement",
     "RichTextSectionElement",
     "ActionsBlock",
+    "AlertBlock",
     "Block",
     "CallBlock",
+    "CardBlock",
+    "CarouselBlock",
     "ContextActionsBlock",
     "ContextBlock",
     "DividerBlock",

slack_sdk/models/blocks/blocks.py

@@ -102,6 +102,12 @@ def parse(cls, block: Union[dict, "Block"]) -> Optional["Block"]:
                     return TaskCardBlock(**block)
                 elif type == PlanBlock.type:
                     return PlanBlock(**block)
+                elif type == CardBlock.type:
+                    return CardBlock(**block)
+                elif type == AlertBlock.type:
+                    return AlertBlock(**block)
+                elif type == CarouselBlock.type:
+                    return CarouselBlock(**block)
                 else:
                     cls.logger.warning(f"Unknown block detected and skipped ({block})")
                     return None
@@ -878,3 +884,149 @@ def __init__(
 
         self.title = title
         self.tasks = tasks
+
+
+class AlertBlock(Block):
+    type = "alert"
+    valid_levels = {"default", "info", "warning", "error", "success"}
+
+    @property
+    def attributes(self) -> Set[str]:  # type: ignore[override]
+        return super().attributes.union({"text", "level"})
+
+    def __init__(
+        self,
+        *,
+        text: Union[str, dict, TextObject],
+        level: Optional[str] = None,
+        block_id: Optional[str] = None,
+        **others: dict,
+    ):
+        """Displays alerts, warnings, and informational messages.
+        https://docs.slack.dev/reference/block-kit/blocks/alert-block
+
+        Args:
+            text (required): The alert message, using plain_text or mrkdwn formatting.
+            level: One of "default", "info", "warning", "error", or "success".
+                Will be "default" if omitted.
+            block_id: A unique identifier for a block. If not specified, a block_id will be generated.
+        """
+        super().__init__(type=self.type, block_id=block_id)
+        show_unknown_key_warning(self, others)
+
+        self.text = TextObject.parse(text)
+        self.level = level
+
+    @JsonValidator("text attribute must be specified")
+    def _validate_text(self):
+        return self.text is not None
+
+    @JsonValidator("level must be a valid value (default, info, warning, error, success)")
+    def _validate_level(self):
+        return self.level is None or self.level in self.valid_levels
+
+
+class CardBlock(Block):
+    type = "card"
+    title_max_length = 150
+    subtitle_max_length = 150
+    body_max_length = 200
+
+    @property
+    def attributes(self) -> Set[str]:  # type: ignore[override]
+        return super().attributes.union(
+            {
+                "hero_image",
+                "icon",
+                "title",
+                "subtitle",
+                "body",
+                "actions",
+            }
+        )
+
+    def __init__(
+        self,
+        *,
+        block_id: Optional[str] = None,
+        hero_image: Optional[str] = None,
+        icon: Optional[str] = None,
+        title: Optional[Union[str, dict, TextObject]] = None,
+        subtitle: Optional[Union[str, dict, TextObject]] = None,
+        body: Optional[Union[str, dict, TextObject]] = None,
+        actions: Optional[Sequence[Union[dict, BlockElement]]] = None,
+        **others: dict,
+    ):
+        """Displays content in a card.
+        https://docs.slack.dev/reference/block-kit/blocks/card-block
+
+        Args:
+            block_id: A unique identifier for a block. If not specified, a block_id will be generated.
+            hero_image: Link to the top image used on the card.
+            icon: Link to the small image used next to the card's title and subtitle.
+            title: Title of the card. 150 characters max.
+            subtitle: Subtitle of the card. 150 characters max.
+            body: Content of the card. 200 characters max.
+            actions: Action buttons shown at the bottom of the card.
+        """
+        super().__init__(type=self.type, block_id=block_id)
+        show_unknown_key_warning(self, others)
+
+        self.hero_image = hero_image
+        self.icon = icon
+        self.title = TextObject.parse(title, default_type=MarkdownTextObject.type)  # type: ignore[arg-type]
+        self.subtitle = TextObject.parse(subtitle, default_type=MarkdownTextObject.type)  # type: ignore[arg-type]
+        self.body = TextObject.parse(body, default_type=MarkdownTextObject.type)  # type: ignore[arg-type]
+        self.actions = BlockElement.parse_all(actions) if actions else None
+
+    @JsonValidator("At least one of hero_image, title, actions, or body is required")
+    def _validate_content(self):
+        return self.hero_image is not None or self.title is not None or self.actions is not None or self.body is not None
+
+    @JsonValidator(f"title attribute cannot exceed {title_max_length} characters")
+    def _validate_title_length(self):
+        return self.title is None or self.title.text is None or len(self.title.text) <= self.title_max_length
+
+    @JsonValidator(f"subtitle attribute cannot exceed {subtitle_max_length} characters")
+    def _validate_subtitle_length(self):
+        return self.subtitle is None or self.subtitle.text is None or len(self.subtitle.text) <= self.subtitle_max_length
+
+    @JsonValidator(f"body attribute cannot exceed {body_max_length} characters")
+    def _validate_body_length(self):
+        return self.body is None or self.body.text is None or len(self.body.text) <= self.body_max_length
+
+
+class CarouselBlock(Block):
+    type = "carousel"
+    elements_max_length = 10
+
+    @property
+    def attributes(self) -> Set[str]:  # type: ignore[override]
+        return super().attributes.union({"elements"})
+
+    def __init__(
+        self,
+        *,
+        elements: Sequence[Union[dict, CardBlock]],
+        block_id: Optional[str] = None,
+        **others: dict,
+    ):
+        """Displays related card blocks in a horizontally-scrolling container.
+        https://docs.slack.dev/reference/block-kit/blocks/carousel-block
+
+        Args:
+            elements (required): A list of cards. Minimum 1, maximum 10 cards.
+            block_id: A unique identifier for a block. If not specified, a block_id will be generated.
+        """
+        super().__init__(type=self.type, block_id=block_id)
+        show_unknown_key_warning(self, others)
+
+        self.elements = Block.parse_all(elements)
+
+    @JsonValidator("elements attribute must contain at least 1 card")
+    def _validate_elements_present(self):
+        return self.elements is not None and len(self.elements) >= 1
+
+    @JsonValidator(f"elements attribute cannot exceed {elements_max_length} cards")
+    def _validate_elements_length(self):
+        return self.elements is None or len(self.elements) <= self.elements_max_length

tests/slack_sdk/models/test_blocks.py

@@ -4,9 +4,12 @@
 from slack_sdk.errors import SlackObjectFormationError
 from slack_sdk.models.blocks import (
     ActionsBlock,
+    AlertBlock,
     Block,
     ButtonElement,
     CallBlock,
+    CardBlock,
+    CarouselBlock,
     ContextActionsBlock,
     ContextBlock,
     DividerBlock,
@@ -1551,3 +1554,153 @@ def test_with_raw_text_object_helper(self):
             ],
         }
         self.assertDictEqual(expected, block.to_dict())
+
+
+class CardBlockTests(unittest.TestCase):
+    def test_document(self):
+        input = {
+            "type": "card",
+            "icon": "https://picsum.photos/36/36",
+            "title": {"type": "mrkdwn", "text": "Lumon Industries", "verbatim": False},
+            "subtitle": {"type": "mrkdwn", "text": "Committed to work-life balance", "verbatim": False},
+            "hero_image": "https://picsum.photos/400/300",
+            "body": {"type": "mrkdwn", "text": "Please enjoy each card equally.", "verbatim": False},
+            "actions": [
+                {
+                    "type": "button",
+                    "text": {"type": "plain_text", "text": "Action Button", "emoji": False},
+                    "action_id": "button_action",
+                }
+            ],
+        }
+        self.assertDictEqual(input, CardBlock(**input).to_dict())
+
+    def test_parse(self):
+        input = {
+            "type": "card",
+            "title": {"type": "mrkdwn", "text": "Title"},
+            "body": {"type": "mrkdwn", "text": "Body text"},
+        }
+        parsed = Block.parse(input)
+        self.assertIsNotNone(parsed)
+        self.assertDictEqual(input, parsed.to_dict())
+
+    def test_minimal_with_title(self):
+        input = {
+            "type": "card",
+            "title": {"type": "mrkdwn", "text": "Just a title"},
+        }
+        self.assertDictEqual(input, CardBlock(**input).to_dict())
+
+    def test_minimal_with_body(self):
+        input = {
+            "type": "card",
+            "body": {"type": "mrkdwn", "text": "Just body text"},
+        }
+        self.assertDictEqual(input, CardBlock(**input).to_dict())
+
+    def test_validation_at_least_one_field(self):
+        with self.assertRaises(SlackObjectFormationError):
+            CardBlock().validate_json()
+
+    def test_title_length_validation(self):
+        with self.assertRaises(SlackObjectFormationError):
+            CardBlock(title={"type": "mrkdwn", "text": "a" * 151}).validate_json()
+
+    def test_subtitle_length_validation(self):
+        with self.assertRaises(SlackObjectFormationError):
+            CardBlock(
+                title={"type": "mrkdwn", "text": "Title"},
+                subtitle={"type": "mrkdwn", "text": "a" * 151},
+            ).validate_json()
+
+    def test_body_length_validation(self):
+        with self.assertRaises(SlackObjectFormationError):
+            CardBlock(body={"type": "mrkdwn", "text": "a" * 201}).validate_json()
+
+
+class AlertBlockTests(unittest.TestCase):
+    def test_document(self):
+        input = {
+            "type": "alert",
+            "text": {"type": "mrkdwn", "text": "The work is mysterious and important.", "verbatim": False},
+            "level": "info",
+        }
+        self.assertDictEqual(input, AlertBlock(**input).to_dict())
+
+    def test_parse(self):
+        input = {
+            "type": "alert",
+            "text": {"type": "mrkdwn", "text": "Notice"},
+            "level": "warning",
+        }
+        parsed = Block.parse(input)
+        self.assertIsNotNone(parsed)
+        self.assertDictEqual(input, parsed.to_dict())
+
+    def test_minimal(self):
+        input = {
+            "type": "alert",
+            "text": {"type": "plain_text", "text": "Simple alert"},
+        }
+        self.assertDictEqual(input, AlertBlock(**input).to_dict())
+
+    def test_all_levels(self):
+        for level in ["default", "info", "warning", "error", "success"]:
+            input = {
+                "type": "alert",
+                "text": {"type": "plain_text", "text": "Test"},
+                "level": level,
+            }
+            AlertBlock(**input).validate_json()
+
+    def test_invalid_level(self):
+        with self.assertRaises(SlackObjectFormationError):
+            AlertBlock(text={"type": "plain_text", "text": "Test"}, level="critical").validate_json()
+
+    def test_missing_text(self):
+        with self.assertRaises(SlackObjectFormationError):
+            AlertBlock(text="").validate_json()
+
+
+class CarouselBlockTests(unittest.TestCase):
+    def test_document(self):
+        input = {
+            "type": "carousel",
+            "elements": [
+                {
+                    "type": "card",
+                    "title": {"type": "mrkdwn", "text": "Card 1"},
+                },
+                {
+                    "type": "card",
+                    "title": {"type": "mrkdwn", "text": "Card 2"},
+                    "body": {"type": "mrkdwn", "text": "Some body text"},
+                },
+            ],
+        }
+        self.assertDictEqual(input, CarouselBlock(**input).to_dict())
+
+    def test_parse(self):
+        input = {
+            "type": "carousel",
+            "elements": [
+                {"type": "card", "title": {"type": "mrkdwn", "text": "Card 1"}},
+            ],
+        }
+        parsed = Block.parse(input)
+        self.assertIsNotNone(parsed)
+        self.assertDictEqual(input, parsed.to_dict())
+
+    def test_single_card(self):
+        input = {
+            "type": "carousel",
+            "elements": [
+                {"type": "card", "title": {"type": "mrkdwn", "text": "Only card"}},
+            ],
+        }
+        self.assertDictEqual(input, CarouselBlock(**input).to_dict())
+
+    def test_empty_elements_validation(self):
+        with self.assertRaises(SlackObjectFormationError):
+            CarouselBlock(elements=[]).validate_json()