feat(methods): add canvases.create and canvases.getContent examples

Author: zimeg

methods/README.md

@@ -34,6 +34,11 @@ $ mvn compile exec:java -Dexec.mainClass=chat.ChatPostMessage  # Make the reques
 
 - **[blocks.validate](https://docs.slack.dev/reference/methods/blocks.validate)**: Validates blocks, messages, and views Block Kit JSON payloads. [Implementation](./src/main/java/blocks/BlocksValidate.java).
 
+### canvases
+
+- **[canvases.create](https://docs.slack.dev/reference/methods/canvases.create)**: Create canvas for a user. [Implementation](./src/main/java/canvases/CanvasesCreate.java).
+- **[canvases.getContent](https://docs.slack.dev/reference/methods/canvases.getContent)**: Get the content of a canvas as markdown (default) or HTML. [Implementation](./src/main/java/canvases/CanvasesGetContent.java).
+
 ### chat
 
 - **[chat.postMessage](https://docs.slack.dev/reference/methods/chat.postmessage)**: Sends a message to a channel. [Implementation](./src/main/java/chat/ChatPostMessage.java).

methods/src/main/java/canvases/CanvasesCreate.java

@@ -0,0 +1,34 @@
+package canvases;
+
+import com.slack.api.Slack;
+import com.slack.api.methods.MethodsClient;
+import com.slack.api.methods.SlackApiException;
+import com.slack.api.methods.request.canvases.CanvasesCreateRequest;
+import com.slack.api.methods.response.canvases.CanvasesCreateResponse;
+import com.slack.api.model.canvas.CanvasDocumentContent;
+import java.io.IOException;
+
+public class CanvasesCreate {
+
+    public static void main(String[] args) throws IOException, SlackApiException {
+        // Read a token from an environment variable
+        String token = System.getenv("SLACK_TOKEN");
+
+        // Initialize
+        MethodsClient methods = Slack.getInstance().methods(token);
+
+        // Call the canvases.create method
+        CanvasesCreateRequest request = CanvasesCreateRequest.builder()
+                .title("Your Brilliant Title")
+                .documentContent(CanvasDocumentContent.builder()
+                        .type("markdown")
+                        .markdown("> standalone canvas!")
+                        .build())
+                .channelId("C0123456789")
+                .build();
+        CanvasesCreateResponse response = methods.canvasesCreate(request);
+
+        // Inspect the response
+        System.out.println(response);
+    }
+}

methods/src/main/java/canvases/CanvasesGetContent.java

@@ -0,0 +1,29 @@
+package canvases;
+
+import com.slack.api.Slack;
+import com.slack.api.methods.MethodsClient;
+import com.slack.api.methods.SlackApiException;
+import com.slack.api.methods.request.canvases.CanvasesGetContentRequest;
+import com.slack.api.methods.response.canvases.CanvasesGetContentResponse;
+import java.io.IOException;
+
+public class CanvasesGetContent {
+
+    public static void main(String[] args) throws IOException, SlackApiException {
+        // Read a token from an environment variable
+        String token = System.getenv("SLACK_TOKEN");
+
+        // Initialize
+        MethodsClient methods = Slack.getInstance().methods(token);
+
+        // Call the canvases.getContent method
+        CanvasesGetContentRequest request = CanvasesGetContentRequest.builder()
+                .canvasId("F1234567890")
+                .contentType("markdown")
+                .build();
+        CanvasesGetContentResponse response = methods.canvasesGetContent(request);
+
+        // Inspect the response
+        System.out.println(response);
+    }
+}

methods/src/main/java/canvases/manifest.json

@@ -0,0 +1,22 @@
+{
+  "display_information": {
+    "name": "Slack API Methods",
+    "description": "Example implementations to call \"canvases\" methods"
+  },
+  "features": {
+    "bot_user": {
+      "display_name": "Slack API Methods",
+      "always_online": true
+    }
+  },
+  "oauth_config": {
+    "scopes": {
+      "bot": ["canvases:read", "canvases:write"]
+    }
+  },
+  "settings": {
+    "org_deploy_enabled": true,
+    "socket_mode_enabled": false,
+    "token_rotation_enabled": false
+  }
+}