✨ Add additional possibilities to load workflow

packages/nodes-base/nodes/ExecuteWorkflow.node.ts

@@ -1,5 +1,12 @@
 import { OptionsWithUri } from 'request';
 
+import {
+	readFile as fsReadFile,
+} from 'fs';
+import { promisify } from 'util';
+
+const fsReadFileAsync = promisify(fsReadFile);
+
 import { IExecuteFunctions } from 'n8n-core';
 import {
 	ILoadOptionsFunctions,
@@ -7,6 +14,8 @@ import {
 	INodePropertyOptions,
 	INodeType,
 	INodeTypeDescription,
+	IExecuteWorkflowInfo,
+	IWorkflowBase,
 } from 'n8n-workflow';
 
 
@@ -26,10 +35,50 @@ export class ExecuteWorkflow implements INodeType {
 		inputs: ['main'],
 		outputs: ['main'],
 		properties: [
+			{
+				displayName: 'Source',
+				name: 'source',
+				type: 'options',
+				options: [
+					{
+						name: 'Database',
+						value: 'database',
+						description: 'Load the workflow from the database by ID.',
+					},
+					{
+						name: 'Local File',
+						value: 'localFile',
+						description: 'Load the workflow from a locally saved file.',
+					},
+					{
+						name: 'Parameter',
+						value: 'parameter',
+						description: 'Load the workflow from a parameter.',
+					},
+					{
+						name: 'URL',
+						value: 'url',
+						description: 'Load the workflow from an URL.',
+					},
+				],
+				default: 'database',
+				description: 'Where to get the workflow to execute from.',
+			},
+
+			// ----------------------------------
+			//         source:database
+			// ----------------------------------
 			{
 				displayName: 'Workflow',
 				name: 'workflowId',
 				type: 'options',
+				displayOptions: {
+					show: {
+						source: [
+							'database',
+						],
+					},
+				},
 				typeOptions: {
 					loadOptionsMethod: 'getWorkflows',
 				},
@@ -37,6 +86,70 @@ export class ExecuteWorkflow implements INodeType {
 				required: true,
 				description: 'The workflow to execute.',
 			},
+
+			// ----------------------------------
+			//         source:localFile
+			// ----------------------------------
+			{
+				displayName: 'Workflow Path',
+				name: 'workflowPath',
+				type: 'string',
+				displayOptions: {
+					show: {
+						source: [
+							'localFile',
+						],
+					},
+				},
+				default: '',
+				placeholder: '/data/workflow.json',
+				required: true,
+				description: 'The path to local JSON workflow file to execute.',
+			},
+
+			// ----------------------------------
+			//         source:parameter
+			// ----------------------------------
+			{
+				displayName: 'Workflow JSON',
+				name: 'workflowJson',
+				type: 'string',
+				typeOptions: {
+					alwaysOpenEditWindow: true,
+					editor: 'code',
+					rows: 10,
+				},
+				displayOptions: {
+					show: {
+						source: [
+							'parameter',
+						],
+					},
+				},
+				default: '\n\n\n',
+				required: true,
+				description: 'The workflow JSON code to execute.',
+			},
+
+			// ----------------------------------
+			//         source:url
+			// ----------------------------------
+			{
+				displayName: 'Workflow URL',
+				name: 'workflowUrl',
+				type: 'string',
+				displayOptions: {
+					show: {
+						source: [
+							'url',
+						],
+					},
+				},
+				default: '',
+				placeholder: 'https://example.com/workflow.json',
+				required: true,
+				description: 'The URL from which to load the workflow from.',
+			},
 		]
 	};
 
@@ -67,8 +180,55 @@ export class ExecuteWorkflow implements INodeType {
 
 	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
 		const items = this.getInputData();
-		const workflowId = this.getNodeParameter('workflowId', 0) as string;
-		const receivedData = await this.executeWorkflow(workflowId, items);
+		const source = this.getNodeParameter('source', 0) as string;
+
+		const workflowInfo: IExecuteWorkflowInfo = {};
+		if (source === 'database') {
+			// Read workflow from database
+			workflowInfo.id = this.getNodeParameter('workflowId', 0) as string;
+
+		} else if (source === 'localFile') {
+			// Read workflow from filesystem
+			const workflowPath = this.getNodeParameter('workflowPath', 0) as string;
+
+			let workflowJson;
+			try {
+				workflowJson = await fsReadFileAsync(workflowPath, { encoding: 'utf8' }) as string;
+			} catch (error) {
+				if (error.code === 'ENOENT') {
+					throw new Error(`The file "${workflowPath}" could not be found.`);
+				}
+
+				throw error;
+			}
+
+			workflowInfo.code = JSON.parse(workflowJson) as IWorkflowBase;
+		} else if (source === 'parameter') {
+			// Read workflow from parameter
+			const workflowJson = this.getNodeParameter('workflowJson', 0) as string;
+			workflowInfo.code = JSON.parse(workflowJson) as IWorkflowBase;
+
+		} else if (source === 'url') {
+			// Read workflow from url
+			const workflowUrl = this.getNodeParameter('workflowUrl', 0) as string;
+
+
+			const requestOptions = {
+				headers: {
+					'accept': 'application/json,text/*;q=0.99',
+				},
+				method: 'GET',
+				uri: workflowUrl,
+				json: true,
+				gzip: true,
+			};
+
+			const response = await this.helpers.request(requestOptions);
+			workflowInfo.code = response;
+
+		}
+
+		const receivedData = await this.executeWorkflow(workflowInfo, items);
 
 		return receivedData;
 	}