Add container block support

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/ActionsIF.java

@@ -11,7 +11,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface ActionsIF extends Block {
+public interface ActionsIF extends Block, ContainerChildBlock {
   String TYPE = "actions";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/Block.java

@@ -33,6 +33,7 @@
     @JsonSubTypes.Type(value = Card.class, name = Card.TYPE),
     @JsonSubTypes.Type(value = Table.class, name = Table.TYPE),
     @JsonSubTypes.Type(value = DataTable.class, name = DataTable.TYPE),
+    @JsonSubTypes.Type(value = ContainerBlock.class, name = ContainerBlock.TYPE),
   }
 )
 @JsonInclude(JsonInclude.Include.NON_EMPTY)

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/BlockElementLengthLimits.java

@@ -20,7 +20,8 @@ public enum BlockElementLengthLimits {
   MAX_TABLE_COLUMNS(20),
   MAX_TABLE_BLOCK_ID_LENGTH(255),
   MIN_DATA_TABLE_ROWS(2),
-  MAX_DATA_TABLE_PAGE_SIZE(100);
+  MAX_DATA_TABLE_PAGE_SIZE(100),
+  MAX_CONTAINER_CHILD_BLOCKS(10);
 
   private final int limit;
 

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/ContainerBlockIF.java

@@ -0,0 +1,95 @@
+package com.hubspot.slack.client.models.blocks;
+
+import com.fasterxml.jackson.annotation.JsonInclude;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.databind.PropertyNamingStrategies.SnakeCaseStrategy;
+import com.fasterxml.jackson.databind.annotation.JsonNaming;
+import com.google.common.base.Preconditions;
+import com.google.common.collect.ImmutableList;
+import com.hubspot.immutables.style.HubSpotStyle;
+import com.hubspot.slack.client.models.blocks.elements.Image;
+import com.hubspot.slack.client.models.blocks.elements.richtextelements.RichTextBlock;
+import com.hubspot.slack.client.models.blocks.objects.Text;
+import com.hubspot.slack.client.models.blocks.objects.TextType;
+import java.util.Optional;
+import org.immutables.value.Value;
+import org.immutables.value.Value.Check;
+import org.immutables.value.Value.Immutable;
+
+@Immutable
+@HubSpotStyle
+@JsonNaming(SnakeCaseStrategy.class)
+@JsonInclude(JsonInclude.Include.NON_ABSENT)
+public interface ContainerBlockIF extends Block {
+  String TYPE = "container";
+
+  @Override
+  @Value.Derived
+  default String getType() {
+    return TYPE;
+  }
+
+  Optional<Text> getTitle();
+
+  Optional<RichTextBlock> getRichTextTitle();
+
+  ImmutableList<ContainerChildBlock> getChildBlocks();
+
+  Optional<Text> getSubtitle();
+
+  Optional<Image> getIcon();
+
+  Optional<ContainerBlockWidth> getWidth();
+
+  Optional<Boolean> getHasHeaderDivider();
+
+  @JsonProperty("is_collapsible")
+  Optional<Boolean> isCollapsible();
+
+  @JsonProperty("default_collapsed")
+  Optional<Boolean> isDefaultCollapsed();
+
+  @Check
+  default void check() {
+    Preconditions.checkState(
+      getTitle().isPresent() || getRichTextTitle().isPresent(),
+      "container block must have either title or rich_text_title"
+    );
+    getTitle()
+      .ifPresent(title -> {
+        Preconditions.checkState(
+          title.getType() == TextType.PLAIN_TEXT,
+          "title must use plain_text formatting"
+        );
+        Preconditions.checkState(
+          title.getText().length() <=
+          BlockElementLengthLimits.MAX_CARD_TITLE_LENGTH.getLimit(),
+          "title cannot exceed %s characters",
+          BlockElementLengthLimits.MAX_CARD_TITLE_LENGTH.getLimit()
+        );
+      });
+    getSubtitle()
+      .ifPresent(subtitle ->
+        Preconditions.checkState(
+          subtitle.getText().length() <=
+          BlockElementLengthLimits.MAX_CARD_TITLE_LENGTH.getLimit(),
+          "subtitle cannot exceed %s characters",
+          BlockElementLengthLimits.MAX_CARD_TITLE_LENGTH.getLimit()
+        )
+      );
+    Preconditions.checkState(
+      getChildBlocks().size() <=
+      BlockElementLengthLimits.MAX_CONTAINER_CHILD_BLOCKS.getLimit(),
+      "child_blocks cannot exceed %s blocks",
+      BlockElementLengthLimits.MAX_CONTAINER_CHILD_BLOCKS.getLimit()
+    );
+    Preconditions.checkState(
+      !isDefaultCollapsed().orElse(false) || isCollapsible().orElse(false),
+      "default_collapsed requires is_collapsible to be true"
+    );
+    Preconditions.checkState(
+      !isCollapsible().orElse(false) || !getHasHeaderDivider().orElse(false),
+      "has_header_divider does not apply to collapsible blocks"
+    );
+  }
+}

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/ContainerBlockWidth.java

@@ -0,0 +1,21 @@
+package com.hubspot.slack.client.models.blocks;
+
+import com.fasterxml.jackson.annotation.JsonValue;
+
+public enum ContainerBlockWidth {
+  NARROW("narrow"),
+  STANDARD("standard"),
+  WIDE("wide"),
+  FULL("full");
+
+  private final String value;
+
+  ContainerBlockWidth(String value) {
+    this.value = value;
+  }
+
+  @JsonValue
+  public String getValue() {
+    return value;
+  }
+}

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/ContainerChildBlock.java

@@ -0,0 +1,26 @@
+package com.hubspot.slack.client.models.blocks;
+
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.hubspot.slack.client.models.blocks.elements.richtextelements.RichTextBlock;
+
+@JsonTypeInfo(
+  use = JsonTypeInfo.Id.NAME,
+  property = "type",
+  defaultImpl = UnknownBlock.class
+)
+@JsonSubTypes(
+  {
+    @JsonSubTypes.Type(value = Actions.class, name = Actions.TYPE),
+    @JsonSubTypes.Type(value = Context.class, name = Context.TYPE),
+    @JsonSubTypes.Type(value = Divider.class, name = Divider.TYPE),
+    @JsonSubTypes.Type(value = File.class, name = File.TYPE),
+    @JsonSubTypes.Type(value = Header.class, name = Header.TYPE),
+    @JsonSubTypes.Type(value = Image.class, name = Image.TYPE),
+    @JsonSubTypes.Type(value = Input.class, name = Input.TYPE),
+    @JsonSubTypes.Type(value = RichTextBlock.class, name = RichTextBlock.TYPE),
+    @JsonSubTypes.Type(value = Section.class, name = Section.TYPE),
+    @JsonSubTypes.Type(value = Table.class, name = Table.TYPE),
+  }
+)
+public interface ContainerChildBlock {}

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/ContextIF.java

@@ -13,7 +13,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface ContextIF extends Block {
+public interface ContextIF extends Block, ContainerChildBlock {
   String TYPE = "context";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/DividerIF.java

@@ -9,7 +9,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface DividerIF extends Block {
+public interface DividerIF extends Block, ContainerChildBlock {
   String TYPE = "divider";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/FileIF.java

@@ -9,7 +9,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface FileIF extends Block {
+public interface FileIF extends Block, ContainerChildBlock {
   String TYPE = "file";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/HeaderIF.java

@@ -13,7 +13,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface HeaderIF extends Block {
+public interface HeaderIF extends Block, ContainerChildBlock {
   String TYPE = "header";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/ImageIF.java

@@ -12,7 +12,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface ImageIF extends Block, ImageBlockOrText {
+public interface ImageIF extends Block, ImageBlockOrText, ContainerChildBlock {
   String TYPE = "image";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/InputIF.java

@@ -14,7 +14,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface InputIF extends Block {
+public interface InputIF extends Block, ContainerChildBlock {
   String TYPE = "input";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/SectionIF.java

@@ -18,7 +18,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface SectionIF extends Block {
+public interface SectionIF extends Block, ContainerChildBlock {
   String TYPE = "section";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/TableIF.java

@@ -16,7 +16,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface TableIF extends Block {
+public interface TableIF extends Block, ContainerChildBlock {
   String TYPE = "table";
 
   @Override

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/UnknownBlock.java

@@ -2,7 +2,7 @@
 
 import java.util.Optional;
 
-public class UnknownBlock implements Block {
+public class UnknownBlock implements Block, ContainerChildBlock {
 
   public static final String TYPE = "unknown";
 

slack-base/src/main/java/com/hubspot/slack/client/models/blocks/elements/richtextelements/RichTextBlockIF.java

@@ -6,6 +6,7 @@
 import com.google.common.collect.ImmutableList;
 import com.hubspot.immutables.style.HubSpotStyle;
 import com.hubspot.slack.client.models.blocks.Block;
+import com.hubspot.slack.client.models.blocks.ContainerChildBlock;
 import org.immutables.value.Value;
 import org.immutables.value.Value.Immutable;
 
@@ -16,7 +17,7 @@
 @Immutable
 @HubSpotStyle
 @JsonNaming(SnakeCaseStrategy.class)
-public interface RichTextBlockIF extends Block {
+public interface RichTextBlockIF extends Block, ContainerChildBlock {
   String TYPE = "rich_text";
 
   @Override