# AWS SNS Slack Message Lambda Subscription

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This AWS CDK Construct is designed to post messages sent from an SNS topic to a Slack Webhook via a Lambda function. The Lambda function accepts JSON text as a message, formats it for Slack, and sends it to the Slack Webhook API.

## Incoming Sample Message

![](./images/example.png)


## Installation

### TypeScript

#### install by npm

```shell
npm install @gammarers/aws-sns-slack-message-lambda-subscription
```

#### install by yarn

```shell
yarn add @gammarers/aws-sns-slack-message-lambda-subscription
```

### Python

```shell
pip install gammarers.aws-sns-slack-message-lambda-subscription
```

### C# / .NET

```shell
dotnet add package Gammarers.CDK.AWS.SNSSlackMessageLambdaSubscription
```
## Example

### Please save it in AWS Secrets Manager in the following format.

get your slack webhook url parts

```text
https://hooks.slack.com/services/<workspace>/<channel>/<whebook>
```

| SecretKey 	 | SecretValue 	   |
|-------------|-----------------|
| Workspace 	 | \<workspace\> 	 |
| Channel   	 | \<channel\>   	 |
| Webhook   	 | \<whebook\>   	 |

### Code

```typescript
import { SNSSlackMessageLambdaSubscription } from '@gammarer/aws-sns-slack-message-lambda-subscription';

declare const topic: sns.Topic;

new SNSSlackMessageLambdaSubscription(stack, 'SNSSlackMessageLambdaSubscription', {
  topic,
  slackWebhookSecretName: 'slak-webhook', // alredy saved slack webhook info.
});
```

```json
{
    "text": ":mega: *TEST*",
    "attachments": [{
        "color": "#2eb886",
        "title": "CodePipeline pipeline execution *SUCCEED*",
        "title_link": "https://github.com/yicr",
        "fields": [
            {
                "title": "Pipeline",
                "value": "pipeline-name"
            }
        ]
    }]
}
```

## License

This project is licensed under the Apache-2.0 License.