Connect Keycloak users and Amazon S3 CSV file in our serverless environment

class KeycloakSourceFindUsers {
    async init() {
        // TODO: Create your keycloak credential
        // More info at https://yepcode.io/docs/integrations/keycloak/#credential-configuration
        this.keycloakClient = await yepcode.integration.keycloak(
            "your-keycloak-credential-name"
        );
    }

    async fetch(publish, done) {
        // TODO: Customize your find users payload
        // See possible options at: https://www.keycloak.org/docs-api/18.0/rest-api/#_users_resource
        const users = await this.keycloakClient.users.find({
            email: "yep",
            exact: false, // An example to search users with email containing "yep"
            max: 100,
        });

        // Each user is an object with content following the structure you can find at: 
        // https://www.keycloak.org/docs-api/18.0/rest-api/#_userrepresentation
        for (const user of users) {
            await publish(user);
        }
        done();
    }

    async close() {}
}

class AwsS3TargetUploadCsv {
    async init() {
        // TODO: Create your aws-s3 credential
        // More info at https://yepcode.io/docs/integrations/aws-s3/#credential-configuration
        this.awsS3 = yepcode.integration.awsS3("your-aws-s3-credential-name");
        // Transforms the items into a csv format
        this.stringifier = csv.stringify({
            delimiter: ",",
        });
        this.targetStream = new PassThrough();
        this.stringifier.pipe(this.targetStream);
        // TODO: customize the Upload content
        // More info at: https://docs.aws.amazon.com/AWSJavaScriptSDK/v3/latest/interfaces/_aws_sdk_lib_storage.options-1.html
        this.upload = new Upload({
            client: this.awsS3,
            params: {
                Bucket: "your-bucket-name",
                Key: "your-file-name.csv",
                Body: this.targetStream,
            },
        });
        this.upload.on("httpUploadProgress", (progress) => {
            console.log(`Upload progress`, progress);
        });
        this.uploadPromise = this.upload.done();
    }

    async consume(item) {
        // TODO: customize the csv row to create from your item content
        const csvRow = [item.value, item.text];
        this.stringifier.write(csvRow);
    }

    async close() {
        try {
            this.stringifier.end();
        } catch (error) {
            console.error(`Error ending stringifier`, error);
        }
        try {
            await this.uploadPromise;
        } catch (error) {
            console.error(`Error ending upload`, error);
        }
    }
}