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Amazon Cognitoの認証情報をAmazon API Gateway+AWS Lambdaで取得

Posted at

Goで取得してみます。

APIGatewayの統合リクエストで Lambdaプロキシ統合の使用 にチェックを入れてください。

Go側では、github.com/aws/aws-lambda-go/eventsevents.APIGatewayProxyRequest で受け取ります。
下記のように取れます。

func handler(ctx context.Context, req events.APIGatewayProxyRequest) (*events.APIGatewayProxyResponse, error) {
	claims := req.RequestContext.Authorizer["claims"].(map[string]interface{})
	res := &events.APIGatewayProxyResponse{
		StatusCode: 200,
		Body:       claims["cognito:username"].(string),
	}
	return res, nil
}

func main() {
	lambda.Start(handler)
}

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