⚡ Make it possible to set credentials to fixed values

packages/cli/commands/execute.ts

@@ -6,6 +6,7 @@ import {
 
 import {
 	ActiveExecutions,
+	CredentialsOverwrites,
 	Db,
 	GenericHelpers,
 	IWorkflowBase,
@@ -100,6 +101,10 @@ export class Execute extends Command {
 		// Wait till the n8n-packages have been read
 		await loadNodesAndCredentialsPromise;
 
+		// Load the credentials overwrites if any exist
+		const credentialsOverwrites = CredentialsOverwrites();
+		await credentialsOverwrites.init();
+
 		// Add the found types to an instance other parts of the application can use
 		const nodeTypes = NodeTypes();
 		await nodeTypes.init(loadNodesAndCredentials.nodeTypes);

packages/cli/commands/start.ts

@@ -11,6 +11,7 @@ import * as config from '../config';
 import {
 	ActiveWorkflowRunner,
 	CredentialTypes,
+	CredentialsOverwrites,
 	Db,
 	GenericHelpers,
 	LoadNodesAndCredentials,
@@ -112,6 +113,10 @@ export class Start extends Command {
 				const loadNodesAndCredentials = LoadNodesAndCredentials();
 				await loadNodesAndCredentials.init();
 
+				// Load the credentials overwrites if any exist
+				const credentialsOverwrites = CredentialsOverwrites();
+				await credentialsOverwrites.init();
+
 				// Add the found types to an instance other parts of the application can use
 				const nodeTypes = NodeTypes();
 				await nodeTypes.init(loadNodesAndCredentials.nodeTypes);

packages/cli/config/index.ts

@@ -54,6 +54,19 @@ const config = convict({
 		},
 	},
 
+	credentials: {
+		overwrite: {
+			// Allows to set default values for credentials which
+			// get automatically prefilled and the user does not get
+			// displayed and can not change.
+			// Format: { CREDENTIAL_NAME: { PARAMTER: VALUE }}
+			doc: 'Overwrites for credentials',
+			format: '*',
+			default: '{}',
+			env: 'CREDENTIALS_OVERWRITE'
+		}
+	},
+
 	executions: {
 		// If a workflow executes all the data gets saved by default. This
 		// could be a problem when a workflow gets executed a lot and processes

packages/cli/src/CredentialTypes.ts

@@ -3,6 +3,9 @@ import {
 	ICredentialTypes as ICredentialTypesInterface,
 } from 'n8n-workflow';
 
+import {
+	CredentialsOverwrites,
+} from './';
 
 class CredentialTypesClass implements ICredentialTypesInterface {
 
@@ -13,6 +16,19 @@ class CredentialTypesClass implements ICredentialTypesInterface {
 
 	async init(credentialTypes: { [key: string]: ICredentialType }): Promise<void> {
 		this.credentialTypes = credentialTypes;
+
+		// Load the credentials overwrites if any exist
+		const credentialsOverwrites = CredentialsOverwrites().getAll();
+
+		for (const credentialType of Object.keys(credentialsOverwrites)) {
+			if (credentialTypes[credentialType] === undefined) {
+				continue;
+			}
+
+			// Add which properties got overwritten that the Editor-UI knows
+			// which properties it should hide
+			credentialTypes[credentialType].__overwrittenProperties = Object.keys(credentialsOverwrites[credentialType]);
+		}
 	}
 
 	getAll(): ICredentialType[] {

packages/cli/src/CredentialsHelper.ts

@@ -0,0 +1,81 @@
+import {
+	Credentials,
+} from 'n8n-core';
+
+import {
+	ICredentialDataDecryptedObject,
+	ICredentialsHelper,
+} from 'n8n-workflow';
+
+import {
+	CredentialsOverwrites,
+	Db,
+	ICredentialsDb,
+} from './';
+
+
+export class CredentialsHelper extends ICredentialsHelper {
+
+	/**
+	 * Returns the credentials instance
+	 *
+	 * @param {string} name Name of the credentials to return instance of
+	 * @param {string} type Type of the credentials to return instance of
+	 * @returns {Credentials}
+	 * @memberof CredentialsHelper
+	 */
+	getCredentials(name: string, type: string): Credentials {
+		if (!this.workflowCredentials[type]) {
+			throw new Error(`No credentials of type "${type}" exist.`);
+		}
+		if (!this.workflowCredentials[type][name]) {
+			throw new Error(`No credentials with name "${name}" exist for type "${type}".`);
+		}
+		const credentialData = this.workflowCredentials[type][name];
+
+		return new Credentials(credentialData.name, credentialData.type, credentialData.nodesAccess, credentialData.data);
+	}
+
+
+	/**
+	 * Returns the decrypted credential data with applied overwrites
+	 *
+	 * @param {string} name Name of the credentials to return data of
+	 * @param {string} type Type of the credentials to return data of
+	 * @returns {ICredentialDataDecryptedObject}
+	 * @memberof CredentialsHelper
+	 */
+	getDecrypted(name: string, type: string): ICredentialDataDecryptedObject {
+		const credentials = this.getCredentials(name, type);
+
+		// Load and apply the credentials overwrites if any exist
+		const credentialsOverwrites = CredentialsOverwrites();
+		return credentialsOverwrites.applyOverwrite(credentials.type, credentials.getData(this.encryptionKey));
+	}
+
+
+	/**
+	 * Updates credentials in the database
+	 *
+	 * @param {string} name Name of the credentials to set data of
+	 * @param {string} type Type of the credentials to set data of
+	 * @param {ICredentialDataDecryptedObject} data The data to set
+	 * @returns {Promise<void>}
+	 * @memberof CredentialsHelper
+	 */
+	async updateCredentials(name: string, type: string, data: ICredentialDataDecryptedObject): Promise<void> {
+		const credentials = await this.getCredentials(name, type);
+
+		credentials.setData(data, this.encryptionKey);
+		const newCredentialsData = credentials.getDataToSave() as ICredentialsDb;
+
+		// Add special database related data
+		newCredentialsData.updatedAt = new Date();
+
+		// TODO: also add user automatically depending on who is logged in, if anybody is logged in
+
+		// Save the credentials in DB
+		await Db.collections.Credentials!.save(newCredentialsData);
+	}
+
+}

packages/cli/src/CredentialsOverwrites.ts

@@ -0,0 +1,56 @@
+import {
+	ICredentialDataDecryptedObject,
+} from 'n8n-workflow';
+
+import {
+	ICredentialsOverwrite,
+	GenericHelpers,
+} from './';
+
+
+class CredentialsOverwritesClass {
+
+	private overwriteData: ICredentialsOverwrite = {};
+
+	async init() {
+		const data = await GenericHelpers.getConfigValue('credentials.overwrite') as string;
+
+		try {
+			this.overwriteData = JSON.parse(data);
+		} catch (error) {
+			throw new Error(`The credentials-overwrite is not valid JSON.`);
+		}
+	}
+
+	applyOverwrite(type: string, data: ICredentialDataDecryptedObject) {
+		const overwrites = this.get(type);
+
+		if (overwrites === undefined) {
+			return data;
+		}
+
+		const returnData = JSON.parse(JSON.stringify(data));
+		Object.assign(returnData, overwrites);
+
+		return returnData;
+	}
+
+	get(type: string): ICredentialDataDecryptedObject | undefined {
+		return this.overwriteData[type];
+	}
+
+	getAll(): ICredentialsOverwrite {
+		return this.overwriteData;
+	}
+}
+
+
+let credentialsOverwritesInstance: CredentialsOverwritesClass | undefined;
+
+export function CredentialsOverwrites(): CredentialsOverwritesClass {
+	if (credentialsOverwritesInstance === undefined) {
+		credentialsOverwritesInstance = new CredentialsOverwritesClass();
+	}
+
+	return credentialsOverwritesInstance;
+}

packages/cli/src/Interfaces.ts

@@ -1,4 +1,5 @@
 import {
+	ICredentialDataDecryptedObject,
 	ICredentialsDecrypted,
 	ICredentialsEncrypted,
 	IDataObject,
@@ -34,6 +35,9 @@ export interface ICustomRequest extends Request {
 	parsedUrl: Url | undefined;
 }
 
+export interface ICredentialsOverwrite {
+	[key: string]: ICredentialDataDecryptedObject;
+}
 
 export interface IDatabaseCollections {
 	Credentials: Repository<ICredentialsDb> | null;

packages/cli/src/LoadNodesAndCredentials.ts

@@ -137,7 +137,7 @@ class LoadNodesAndCredentialsClass {
 			}
 		}
 
-		this.credentialTypes[credentialName] = tempCredential;
+		this.credentialTypes[tempCredential.name] = tempCredential;
 	}
 
 

packages/cli/src/NodeTypes.ts

@@ -15,7 +15,7 @@ class NodeTypesClass implements INodeTypes {
 		// Some nodeTypes need to get special parameters applied like the
 		// polling nodes the polling times
 		for (const nodeTypeData of Object.values(nodeTypes)) {
-			const applyParameters = NodeHelpers.getSpecialNodeParameters(nodeTypeData.type)
+			const applyParameters = NodeHelpers.getSpecialNodeParameters(nodeTypeData.type);
 
 			if (applyParameters.length) {
 				nodeTypeData.type.description.properties.unshift.apply(nodeTypeData.type.description.properties, applyParameters);

packages/cli/src/Server.ts

@@ -18,6 +18,7 @@ import * as csrf from 'csrf';
 import {
 	ActiveExecutions,
 	ActiveWorkflowRunner,
+	CredentialsOverwrites,
 	CredentialTypes,
 	Db,
 	IActivationError,
@@ -648,6 +649,10 @@ class App {
 		this.app.post('/rest/credentials', ResponseHelper.send(async (req: express.Request, res: express.Response): Promise<ICredentialsResponse> => {
 			const incomingData = req.body;
 
+			if (!incomingData.name || incomingData.name.length < 3) {
+				throw new ResponseHelper.ResponseError(`Credentials name must be at least 3 characters long.`, undefined, 400);
+			}
+
 			// Add the added date for node access permissions
 			for (const nodeAccess of incomingData.nodesAccess) {
 				nodeAccess.date = this.getCurrentDate();
@@ -684,6 +689,7 @@ class App {
 
 			// Save the credentials in DB
 			const result = await Db.collections.Credentials!.save(newCredentialsData);
+			result.data = incomingData.data;
 
 			// Convert to response format in which the id is a string
 			(result as unknown as ICredentialsResponse).id = result.id.toString();
@@ -805,14 +811,6 @@ class App {
 
 			const results = await Db.collections.Credentials!.find(findQuery) as unknown as ICredentialsResponse[];
 
-			let encryptionKey = undefined;
-			if (req.query.includeData === true) {
-				encryptionKey = await UserSettings.getEncryptionKey();
-				if (encryptionKey === undefined) {
-					throw new Error('No encryption key got found to decrypt the credentials!');
-				}
-			}
-
 			let result;
 			for (result of results) {
 				(result as ICredentialsDecryptedResponse).id = result.id.toString();
@@ -866,19 +864,17 @@ class App {
 			}
 
 			const credentials = new Credentials(result.name, result.type, result.nodesAccess, result.data);
-			(result as ICredentialsDecryptedDb).data = credentials.getData(encryptionKey!);
-			(result as ICredentialsDecryptedResponse).id = result.id.toString();
+			const savedCredentialsData = credentials.getData(encryptionKey);
 
-			const oauthCredentials = (result as ICredentialsDecryptedDb).data;
-			if (oauthCredentials === undefined) {
-				throw new Error('Unable to read OAuth credentials');
-			}
+			// Load the credentials overwrites if any exist
+			const credentialsOverwrites = CredentialsOverwrites();
+			const oauthCredentials = credentialsOverwrites.applyOverwrite(credentials.type, savedCredentialsData);
 
 			const token = new csrf();
 			// Generate a CSRF prevention token and send it as a OAuth2 state stringma/ERR
-			oauthCredentials.csrfSecret = token.secretSync();
+			const csrfSecret = token.secretSync();
 			const state = {
-				token: token.create(oauthCredentials.csrfSecret),
+				token: token.create(csrfSecret),
 				cid: req.query.id
 			};
 			const stateEncodedStr = Buffer.from(JSON.stringify(state)).toString('base64') as string;
@@ -893,7 +889,8 @@ class App {
 				state: stateEncodedStr,
 			});
 
-			credentials.setData(oauthCredentials, encryptionKey);
+			savedCredentialsData.csrfSecret = csrfSecret;
+			credentials.setData(savedCredentialsData, encryptionKey);
 			const newCredentialsData = credentials.getDataToSave() as unknown as ICredentialsDb;
 
 			// Add special database related data
@@ -939,12 +936,11 @@ class App {
 			}
 
 			const credentials = new Credentials(result.name, result.type, result.nodesAccess, result.data);
-			(result as ICredentialsDecryptedDb).data = credentials.getData(encryptionKey!);
-			const oauthCredentials = (result as ICredentialsDecryptedDb).data;
-			if (oauthCredentials === undefined) {
-				const errorResponse = new ResponseHelper.ResponseError('Unable to read OAuth credentials!', undefined, 503);
-				return ResponseHelper.sendErrorResponse(res, errorResponse);
-			}
+			const savedCredentialsData = credentials.getData(encryptionKey!);
+
+			// Load the credentials overwrites if any exist
+			const credentialsOverwrites = CredentialsOverwrites();
+			const oauthCredentials = credentialsOverwrites.applyOverwrite(credentials.type, savedCredentialsData);
 
 			const token = new csrf();
 			if (oauthCredentials.csrfSecret === undefined || !token.verify(oauthCredentials.csrfSecret as string, state.token)) {
@@ -968,9 +964,10 @@ class App {
 				return ResponseHelper.sendErrorResponse(res, errorResponse);
 			}
 
-			oauthCredentials.oauthTokenData = JSON.stringify(oauthToken.data);
-			_.unset(oauthCredentials, 'csrfSecret');
-			credentials.setData(oauthCredentials, encryptionKey);
+			savedCredentialsData.oauthTokenData = JSON.stringify(oauthToken.data);
+			_.unset(savedCredentialsData, 'csrfSecret');
+
+			credentials.setData(savedCredentialsData, encryptionKey);
 			const newCredentialsData = credentials.getDataToSave() as unknown as ICredentialsDb;
 			// Add special database related data
 			newCredentialsData.updatedAt = this.getCurrentDate();

packages/cli/src/WorkflowExecuteAdditionalData.ts

@@ -1,6 +1,6 @@
 import {
+	CredentialsHelper,
 	Db,
-	ICredentialsDb,
 	IExecutionDb,
 	IExecutionFlattedDb,
 	IPushDataExecutionFinished,
@@ -14,13 +14,11 @@ import {
 } from './';
 
 import {
-	Credentials,
 	UserSettings,
 	WorkflowExecute,
 } from 'n8n-core';
 
 import {
-	ICredentialDataDecryptedObject,
 	IDataObject,
 	IExecuteData,
 	IExecuteWorkflowInfo,
@@ -372,40 +370,6 @@ export async function executeWorkflow(workflowInfo: IExecuteWorkflowInfo, additi
 }
 
 
-/**
- * Updates credentials with new data
- *
- * @export
- * @param {string} name Name of the credentials to update
- * @param {string} type Type of the credentials to update
- * @param {ICredentialDataDecryptedObject} data The new credential data
- * @param {string} encryptionKey The encryption key to use
- * @returns {Promise<void>}
- */
-export async function updateCredentials(name: string, type: string, data: ICredentialDataDecryptedObject, encryptionKey: string): Promise<void> {
-	const foundCredentials = await Db.collections.Credentials!.find({ name, type });
-
-	if (!foundCredentials.length) {
-		throw new Error(`Could not find credentials for type "${type}" with name "${name}".`);
-	}
-
-	const credentialsDb = foundCredentials[0];
-
-	// Encrypt the data
-	const credentials = new Credentials(credentialsDb.name, credentialsDb.type, credentialsDb.nodesAccess);
-	credentials.setData(data, encryptionKey);
-	const newCredentialsData = credentials.getDataToSave() as ICredentialsDb;
-
-	// Add special database related data
-	newCredentialsData.updatedAt = this.getCurrentDate();
-
-	// TODO: also add user automatically depending on who is logged in, if anybody is logged in
-
-	// Save the credentials in DB
-	await Db.collections.Credentials!.save(newCredentialsData);
-}
-
-
 /**
  * Returns the base additional data without webhooks
  *
@@ -428,11 +392,11 @@ export async function getBase(credentials: IWorkflowCredentials, currentNodePara
 
 	return {
 		credentials,
+		credentialsHelper: new CredentialsHelper(credentials, encryptionKey),
 		encryptionKey,
 		executeWorkflow,
 		restApiUrl: urlBaseWebhook + config.get('endpoints.rest') as string,
 		timezone,
-		updateCredentials,
 		webhookBaseUrl,
 		webhookTestBaseUrl,
 		currentNodeParameters,

packages/cli/src/index.ts

@@ -1,4 +1,6 @@
+export * from './CredentialsHelper';
 export * from './CredentialTypes';
+export * from './CredentialsOverwrites';
 export * from './Interfaces';
 export * from './LoadNodesAndCredentials';
 export * from './NodeTypes';

packages/core/src/Credentials.ts

@@ -1,25 +1,14 @@
 import {
-	ICredentialDataDecryptedObject,
 	CredentialInformation,
+	ICredentialDataDecryptedObject,
+	ICredentials,
 	ICredentialsEncrypted,
-	ICredentialNodeAccess,
 } from 'n8n-workflow';
 
 import { enc, AES } from 'crypto-js';
 
-export class Credentials implements ICredentialsEncrypted {
-	name: string;
-	type: string;
-	data: string | undefined;
-	nodesAccess: ICredentialNodeAccess[];
 
-
-	constructor(name: string, type: string, nodesAccess: ICredentialNodeAccess[], data?: string) {
-		this.name = name;
-		this.type = type;
-		this.nodesAccess = nodesAccess;
-		this.data = data;
-	}
+export class Credentials extends ICredentials {
 
 
 	/**

packages/core/src/NodeExecuteFunctions.ts

@@ -1,5 +1,4 @@
 import {
-	Credentials,
 	IHookFunctions,
 	ILoadOptionsFunctions,
 	IResponseError,
@@ -154,7 +153,7 @@ export function requestOAuth(this: IAllExecuteFunctions, credentialsType: string
 				const name = node.credentials[credentialsType];
 
 				// Save the refreshed token
-				await additionalData.updateCredentials(name, credentialsType, newCredentialsData, additionalData.encryptionKey);
+				await additionalData.credentialsHelper.updateCredentials(name, credentialsType, newCredentialsData);
 
 				// Make the request again with the new token
 				const newRequestOptions = newToken.sign(requestOptions as clientOAuth2.RequestObject);
@@ -244,20 +243,7 @@ export function getCredentials(workflow: Workflow, node: INode, type: string, ad
 
 	const name = node.credentials[type];
 
-	if (!additionalData.credentials[type]) {
-		throw new Error(`No credentials of type "${type}" exist.`);
-	}
-	if (!additionalData.credentials[type][name]) {
-		throw new Error(`No credentials with name "${name}" exist for type "${type}".`);
-	}
-	const credentialData = additionalData.credentials[type][name];
-
-	const credentials = new Credentials(name, type, credentialData.nodesAccess, credentialData.data);
-	const decryptedDataObject = credentials.getData(additionalData.encryptionKey, node.type);
-
-	if (decryptedDataObject === null) {
-		throw new Error('Could not get the credentials');
-	}
+	const decryptedDataObject = additionalData.credentialsHelper.getDecrypted(name, type);
 
 	return decryptedDataObject;
 }
@@ -423,7 +409,7 @@ export function getExecutePollFunctions(workflow: Workflow, node: INode, additio
 			helpers: {
 				prepareBinaryData,
 				request: requestPromise,
-				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> {
+				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> { // tslint:disable-line:no-any
 					return requestOAuth.call(this, credentialsType, requestOptions, node, additionalData);
 				},
 				returnJsonArray,
@@ -477,7 +463,7 @@ export function getExecuteTriggerFunctions(workflow: Workflow, node: INode, addi
 			helpers: {
 				prepareBinaryData,
 				request: requestPromise,
-				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> {
+				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> { // tslint:disable-line:no-any
 					return requestOAuth.call(this, credentialsType, requestOptions, node, additionalData);
 				},
 				returnJsonArray,
@@ -558,7 +544,7 @@ export function getExecuteFunctions(workflow: Workflow, runExecutionData: IRunEx
 			helpers: {
 				prepareBinaryData,
 				request: requestPromise,
-				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> {
+				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> { // tslint:disable-line:no-any
 					return requestOAuth.call(this, credentialsType, requestOptions, node, additionalData);
 				},
 				returnJsonArray,
@@ -640,7 +626,7 @@ export function getExecuteSingleFunctions(workflow: Workflow, runExecutionData:
 			helpers: {
 				prepareBinaryData,
 				request: requestPromise,
-				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> {
+				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> { // tslint:disable-line:no-any
 					return requestOAuth.call(this, credentialsType, requestOptions, node, additionalData);
 				},
 			},
@@ -690,7 +676,7 @@ export function getLoadOptionsFunctions(workflow: Workflow, node: INode, additio
 			},
 			helpers: {
 				request: requestPromise,
-				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> {
+				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> { // tslint:disable-line:no-any
 					return requestOAuth.call(this, credentialsType, requestOptions, node, additionalData);
 				},
 			},
@@ -748,7 +734,7 @@ export function getExecuteHookFunctions(workflow: Workflow, node: INode, additio
 			},
 			helpers: {
 				request: requestPromise,
-				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> {
+				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> { // tslint:disable-line:no-any
 					return requestOAuth.call(this, credentialsType, requestOptions, node, additionalData);
 				},
 			},
@@ -833,7 +819,7 @@ export function getExecuteWebhookFunctions(workflow: Workflow, node: INode, addi
 			helpers: {
 				prepareBinaryData,
 				request: requestPromise,
-				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> {
+				requestOAuth(this: IAllExecuteFunctions, credentialsType: string, requestOptions: OptionsWithUri | requestPromise.RequestPromiseOptions): Promise<any> { // tslint:disable-line:no-any
 					return requestOAuth.call(this, credentialsType, requestOptions, node, additionalData);
 				},
 				returnJsonArray,

packages/core/src/UserSettings.ts

@@ -143,7 +143,6 @@ export async function writeUserSettings(userSettings: IUserSettings, settingsPat
  */
 export async function getUserSettings(settingsPath?: string, ignoreCache?: boolean): Promise<IUserSettings | undefined> {
 	if (settingsCache !== undefined && ignoreCache !== true) {
-
 		return settingsCache;
 	}
 

packages/core/test/Helpers.ts

@@ -2,6 +2,7 @@ import { set } from 'lodash';
 
 import {
 	ICredentialDataDecryptedObject,
+	ICredentialsHelper,
 	IExecuteWorkflowInfo,
 	INodeExecutionData,
 	INodeParameters,
@@ -16,11 +17,25 @@ import {
 } from 'n8n-workflow';
 
 import {
+	Credentials,
 	IDeferredPromise,
 	IExecuteFunctions,
 } from '../src';
 
 
+export class CredentialsHelper extends ICredentialsHelper {
+	getDecrypted(name: string, type: string): ICredentialDataDecryptedObject {
+		return {};
+	}
+
+	getCredentials(name: string, type: string): Credentials {
+		return new Credentials('', '', [], '');
+	}
+
+	async updateCredentials(name: string, type: string, data: ICredentialDataDecryptedObject): Promise<void> {}
+}
+
+
 class NodeTypesClass implements INodeTypes {
 
 	nodeTypes: INodeTypeData = {
@@ -276,12 +291,12 @@ export function WorkflowExecuteAdditionalData(waitPromise: IDeferredPromise<IRun
 
 	return {
 		credentials: {},
+		credentialsHelper: new CredentialsHelper({}, ''),
 		hooks: new WorkflowHooks(hookFunctions, 'trigger', '1', workflowData),
 		executeWorkflow: async (workflowInfo: IExecuteWorkflowInfo): Promise<any> => {}, // tslint:disable-line:no-any
 		restApiUrl: '',
 		encryptionKey: 'test',
 		timezone: 'America/New_York',
-		updateCredentials: async (name: string, type: string, data: ICredentialDataDecryptedObject, encryptionKey: string): Promise<void> => {},
 		webhookBaseUrl: 'webhook',
 		webhookTestBaseUrl: 'webhook-test',
 	};

packages/editor-ui/src/components/CredentialsEdit.vue

@@ -8,7 +8,7 @@
 						Credential type:
 					</el-col>
 					<el-col :span="18">
-						<el-select v-model="credentialType" placeholder="Select Type" size="small">
+						<el-select v-model="credentialType" filterable placeholder="Select Type" size="small">
 							<el-option
 								v-for="item in credentialTypes"
 								:key="item.name"

packages/editor-ui/src/components/CredentialsInput.vue

@@ -34,14 +34,14 @@
 		</el-row>
 
 		<br />
-		<div class="headline">
+		<div class="headline" v-if="credentialProperties.length">
 			Credential Data:
 			<el-tooltip class="credentials-info" placement="top" effect="light">
 				<div slot="content" v-html="helpTexts.credentialsData"></div>
 				<font-awesome-icon icon="question-circle" />
 			</el-tooltip>
 		</div>
-		<el-row v-for="parameter in credentialTypeData.properties" :key="parameter.name" class="parameter-wrapper">
+		<el-row v-for="parameter in credentialProperties" :key="parameter.name" class="parameter-wrapper">
 			<el-col :span="6" class="parameter-name">
 				{{parameter.displayName}}:
 				<el-tooltip placement="top" class="parameter-info" v-if="parameter.description" effect="light">
@@ -97,7 +97,11 @@ import { restApi } from '@/components/mixins/restApi';
 import { nodeHelpers } from '@/components/mixins/nodeHelpers';
 import { showMessage } from '@/components/mixins/showMessage';
 
-import { ICredentialsDecryptedResponse, IUpdateInformation } from '@/Interface';
+import {
+	ICredentialsDecryptedResponse,
+	ICredentialsResponse,
+	IUpdateInformation,
+} from '@/Interface';
 import {
 	CredentialInformation,
 	ICredentialDataDecryptedObject,
@@ -105,6 +109,7 @@ import {
 	ICredentialType,
 	ICredentialNodeAccess,
 	INodeCredentialDescription,
+	INodeProperties,
 	INodeTypeDescription,
 } from 'n8n-workflow';
 
@@ -172,15 +177,20 @@ export default mixins(
 				};
 			});
 		},
+		credentialProperties (): INodeProperties[] {
+			return this.credentialTypeData.properties.filter((propertyData: INodeProperties) => {
+				return !this.credentialTypeData.__overwrittenProperties || !this.credentialTypeData.__overwrittenProperties.includes(propertyData.name);
+			});
+		},
 		isOAuthType (): boolean {
-			return this.credentialData && this.credentialData.type === 'oAuth2Api';
+			return this.credentialTypeData.name === 'oAuth2Api' || (this.credentialTypeData.extends !== undefined && this.credentialTypeData.extends.includes('oAuth2Api'));
 		},
 		isOAuthConnected (): boolean {
 			if (this.isOAuthType === false) {
 				return false;
 			}
 
-			return !!this.credentialData.data.oauthTokenData;
+			return this.credentialData !== null && !!this.credentialData.data.oauthTokenData;
 		},
 	},
 	methods: {
@@ -192,7 +202,7 @@ export default mixins(
 			tempValue[name] = parameterData.value;
 			Vue.set(this, 'propertyValue', tempValue);
 		},
-		async createCredentials (): Promise<void> {
+		async createCredentials (doNotEmitData?: boolean): Promise<ICredentialsResponse | null> {
 			const nodesAccess = this.nodesAccess.map((nodeType) => {
 				return {
 					nodeType,
@@ -211,18 +221,35 @@ export default mixins(
 				result = await this.restApi().createNewCredentials(newCredentials);
 			} catch (error) {
 				this.$showError(error, 'Problem Creating Credentials', 'There was a problem creating the credentials:');
-				return;
+				return null;
 			}
 
 			// Add also to local store
 			this.$store.commit('addCredentials', result);
 
+			if (doNotEmitData !== true) {
 				this.$emit('credentialsCreated', result);
+			}
+
+			return result;
 		},
 		async oAuth2CredentialAuthorize () {
 			let url;
+
+			let credentialData = this.credentialData;
+			let newCredentials = false;
+			if (!credentialData) {
+				// Credentials did not get created yet. So create first before
+				// doing oauth authorize
+				credentialData = await this.createCredentials(true);
+				newCredentials = true;
+				if (credentialData === null) {
+					return;
+				}
+			}
+
 			try {
-				url = await this.restApi().oAuth2CredentialAuthorize(this.credentialData) as string;
+				url = await this.restApi().oAuth2CredentialAuthorize(credentialData) as string;
 			} catch (error) {
 				this.$showError(error, 'OAuth Authorization Error', 'Error generating authorization URL:');
 				return;
@@ -241,13 +268,17 @@ export default mixins(
 
 					// Set some kind of data that status changes.
 					// As data does not get displayed directly it does not matter what data.
-					this.credentialData.data.oauthTokenData = {};
+					credentialData.data.oauthTokenData = {};
 
 					// Close the window
 					if (oauthPopup) {
 						oauthPopup.close();
 					}
 
+					if (newCredentials === true) {
+						this.$emit('credentialsCreated', credentialData);
+					}
+
 					this.$showMessage({
 						title: 'Connected',
 						message: 'Got connected!',

packages/workflow/src/Interfaces.ts

@@ -35,6 +35,27 @@ export interface IGetCredentials {
 	get(type: string, name: string): Promise<ICredentialsEncrypted>;
 }
 
+export abstract class ICredentials {
+	name: string;
+	type: string;
+	data: string | undefined;
+	nodesAccess: ICredentialNodeAccess[];
+
+	constructor(name: string, type: string, nodesAccess: ICredentialNodeAccess[], data?: string) {
+		this.name = name;
+		this.type = type;
+		this.nodesAccess = nodesAccess;
+		this.data = data;
+	}
+
+	abstract getData(encryptionKey: string, nodeType?: string): ICredentialDataDecryptedObject;
+	abstract getDataKey(key: string, encryptionKey: string, nodeType?: string): CredentialInformation;
+	abstract getDataToSave(): ICredentialsEncrypted;
+	abstract hasNodeAccess(nodeType: string): boolean;
+	abstract setData(data: ICredentialDataDecryptedObject, encryptionKey: string): void;
+	abstract setDataKey(key: string, data: CredentialInformation, encryptionKey: string): void;
+}
+
 // Defines which nodes are allowed to access the credentials and
 // when that access got grented from which user
 export interface ICredentialNodeAccess {
@@ -57,11 +78,26 @@ export interface ICredentialsEncrypted {
 	data?: string;
 }
 
+export abstract class ICredentialsHelper {
+	encryptionKey: string;
+	workflowCredentials: IWorkflowCredentials;
+
+	constructor(workflowCredentials: IWorkflowCredentials, encryptionKey: string) {
+		this.encryptionKey = encryptionKey;
+		this.workflowCredentials = workflowCredentials;
+	}
+
+	abstract getCredentials(name: string, type: string): ICredentials;
+	abstract getDecrypted(name: string, type: string): ICredentialDataDecryptedObject;
+	abstract updateCredentials(name: string, type: string, data: ICredentialDataDecryptedObject): Promise<void>;
+}
+
 export interface ICredentialType {
 	name: string;
 	displayName: string;
 	extends?: string[];
 	properties: INodeProperties[];
+	__overwrittenProperties?: string[];
 }
 
 export interface ICredentialTypes {
@@ -644,6 +680,7 @@ export interface IWorkflowExecuteHooks {
 
 export interface IWorkflowExecuteAdditionalData {
 	credentials: IWorkflowCredentials;
+	credentialsHelper: ICredentialsHelper;
 	encryptionKey: string;
 	executeWorkflow: (workflowInfo: IExecuteWorkflowInfo, additionalData: IWorkflowExecuteAdditionalData, inputData?: INodeExecutionData[]) => Promise<any>; // tslint:disable-line:no-any
 	// hooks?: IWorkflowExecuteHooks;
@@ -652,7 +689,6 @@ export interface IWorkflowExecuteAdditionalData {
 	httpRequest?: express.Request;
 	restApiUrl: string;
 	timezone: string;
-	updateCredentials: (name: string, type: string, data: ICredentialDataDecryptedObject, encryptionKey: string) => Promise<void>;
 	webhookBaseUrl: string;
 	webhookTestBaseUrl: string;
 	currentNodeParameters? : INodeParameters[];