n8n/packages/nodes-base/nodes/Aws/DynamoDB/GenericFunctions.ts

import {
	IExecuteFunctions,
	IHookFunctions,
	ILoadOptionsFunctions,
	IWebhookFunctions,
} from 'n8n-core';

import { deepCopy, IDataObject, IHttpRequestOptions, INodeExecutionData } from 'n8n-workflow';

import { IRequestBody } from './types';

export async function awsApiRequest(
	this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
	service: string,
	method: string,
	path: string,
	body?: object | IRequestBody,
	headers?: object,
): Promise<any> {
	const credentials = await this.getCredentials('aws');
	const requestOptions = {
		qs: {
			service,
			path,
		},
		method,
		body: JSON.stringify(body),
		url: '',
		headers,
		region: credentials?.region as string,
	} as IHttpRequestOptions;

	try {
		return JSON.parse(
			await this.helpers.requestWithAuthentication.call(this, 'aws', requestOptions),
		);
	} catch (error) {
		const errorMessage =
			error.response?.body?.message || error.response?.body?.Message || error.message;
		if (error.statusCode === 403) {
			if (errorMessage === 'The security token included in the request is invalid.') {
				throw new Error('The AWS credentials are not valid!');
			} else if (
				errorMessage.startsWith(
					'The request signature we calculated does not match the signature you provided',
				)
			) {
				throw new Error('The AWS credentials are not valid!');
			}
		}

		throw new Error(`AWS error response [${error.statusCode}]: ${errorMessage}`);
	}
}

export async function awsApiRequestAllItems(
	this: IHookFunctions | IExecuteFunctions | ILoadOptionsFunctions | IWebhookFunctions,
	service: string,
	method: string,
	path: string,
	body?: IRequestBody,
	headers?: object,
): Promise<any> {
	const returnData: IDataObject[] = [];

	let responseData;

	do {
		const originalHeaders = Object.assign({}, headers); //The awsapirequest function adds the hmac signature to the headers, if we pass the modified headers back in on the next call it will fail with invalid signature
		responseData = await awsApiRequest.call(this, service, method, path, body, originalHeaders);
		if (responseData.LastEvaluatedKey) {
			body!.ExclusiveStartKey = responseData.LastEvaluatedKey;
		}
		returnData.push(...responseData.Items);
	} while (responseData.LastEvaluatedKey !== undefined);

	return returnData;
}

export function copyInputItem(item: INodeExecutionData, properties: string[]): IDataObject {
	// Prepare the data to insert and copy it to be returned
	const newItem: IDataObject = {};
	for (const property of properties) {
		if (item.json[property] === undefined) {
			newItem[property] = null;
		} else {
			newItem[property] = deepCopy(item.json[property]);
		}
	}
	return newItem;
}