n8n/packages/nodes-base/nodes/Contentful/GenericFunctions.ts

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

import {
	OptionsWithUri,
} from 'request';

import {
	IDataObject,
} from 'n8n-workflow';

export async function contentfulApiRequest(this: IExecuteFunctions | IExecuteSingleFunctions | ILoadOptionsFunctions, method: string, resource: string, body: any = {}, qs: IDataObject = {}, uri?: string, option: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any

	const credentials = this.getCredentials('contentfulApi');
	if (credentials === undefined) {
		throw new Error('No credentials got returned!');
	}

	const source = this.getNodeParameter('source', 0) as string;
	const isPreview = source === 'previewApi';

	const options: OptionsWithUri = {
		method,
		qs,
		body,
		uri: uri ||`https://${isPreview ? 'preview' : 'cdn'}.contentful.com${resource}`,
		json: true
	};

	if (isPreview) {
		qs.access_token = credentials.ContentPreviewaccessToken as string;
	} else {
		qs.access_token = credentials.ContentDeliveryaccessToken as string;
	}

	try {
		return await this.helpers.request!(options);
	} catch (error) {

		let errorMessage = error;

		if (error.response && error.response.body && error.response.body.details) {
			const details = error.response.body.details;
			errorMessage = details.errors.map((e: IDataObject) => e.details).join('|');
		} else if (error.response && error.response.body && error.response.body.message) {
			errorMessage = error.response.body.message;
		}

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

}

export async function contenfulApiRequestAllItems(this: ILoadOptionsFunctions | IExecuteFunctions, propertyName: string, method: string, resource: string, body: any = {}, query: IDataObject = {}): Promise<any> { // tslint:disable-line:no-any

	const returnData: IDataObject[] = [];

	let responseData;

	query.limit = 100;
	query.skip = 0;

	do {
		responseData = await contentfulApiRequest.call(this, method, resource, body, query);
		query.skip = (query.skip + 1) * query.limit;
		returnData.push.apply(returnData, responseData[propertyName]);
	} while (
		returnData.length < responseData.total
	);

	return returnData;
}