first commit

packages/nodes-base/nodes/RssFeedRead/RssFeedReadTrigger.node.ts

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+import moment from 'moment-timezone';
+import type {
+	IDataObject,
+	INodeExecutionData,
+	INodeType,
+	INodeTypeDescription,
+	IPollFunctions,
+} from 'n8n-workflow';
+import { NodeConnectionTypes, NodeOperationError } from 'n8n-workflow';
+import Parser from 'rss-parser';
+
+interface PollData {
+	lastItemDate?: string;
+	lastTimeChecked?: string;
+}
+
+export class RssFeedReadTrigger implements INodeType {
+	description: INodeTypeDescription = {
+		displayName: 'RSS Feed Trigger',
+		name: 'rssFeedReadTrigger',
+		icon: 'fa:rss',
+		iconColor: 'orange-red',
+		group: ['trigger'],
+		version: 1,
+		description: 'Starts a workflow when an RSS feed is updated',
+		subtitle: '={{$parameter["event"]}}',
+		defaults: {
+			name: 'RSS Feed Trigger',
+			color: '#b02020',
+		},
+		polling: true,
+		inputs: [],
+		outputs: [NodeConnectionTypes.Main],
+		properties: [
+			{
+				displayName: 'Feed URL',
+				name: 'feedUrl',
+				type: 'string',
+				default: 'https://blog.n8n.io/rss/',
+				required: true,
+				description: 'URL of the RSS feed to poll',
+			},
+		],
+	};
+
+	async poll(this: IPollFunctions): Promise<INodeExecutionData[][] | null> {
+		const pollData = this.getWorkflowStaticData('node') as PollData;
+		const feedUrl = this.getNodeParameter('feedUrl') as string;
+
+		const dateToCheck = Date.parse(
+			pollData.lastItemDate ?? pollData.lastTimeChecked ?? moment().utc().format(),
+		);
+
+		if (!feedUrl) {
+			throw new NodeOperationError(this.getNode(), 'The parameter "URL" has to be set!');
+		}
+
+		const parser = new Parser();
+
+		let feed: Parser.Output<IDataObject>;
+		try {
+			feed = await parser.parseURL(feedUrl);
+		} catch (error) {
+			if (error.code === 'ECONNREFUSED') {
+				throw new NodeOperationError(
+					this.getNode(),
+					`It was not possible to connect to the URL. Please make sure the URL "${feedUrl}" it is valid!`,
+				);
+			}
+
+			throw new NodeOperationError(this.getNode(), error as Error);
+		}
+
+		const returnData: IDataObject[] = [];
+
+		if (feed.items) {
+			if (this.getMode() === 'manual') {
+				return [this.helpers.returnJsonArray(feed.items[0])];
+			}
+			feed.items.forEach((item) => {
+				if (item.isoDate && Date.parse(item.isoDate) > dateToCheck) {
+					returnData.push(item);
+				}
+			});
+
+			if (feed.items.length) {
+				pollData.lastItemDate = feed.items.reduce((a, b) =>
+					new Date(a.isoDate!) > new Date(b.isoDate!) ? a : b,
+				).isoDate;
+			}
+		}
+
+		if (Array.isArray(returnData) && returnData.length !== 0) {
+			return [this.helpers.returnJsonArray(returnData)];
+		}
+
+		return null;
+	}
+}