feat: External Secrets storage for credentials (#6477)

Github issue / Community forum post (link here to close automatically):

---------

Co-authored-by: Romain Minaud <romain.minaud@gmail.com>
Co-authored-by: Valya Bullions <valya@n8n.io>
Co-authored-by: Csaba Tuncsik <csaba@n8n.io>
Co-authored-by: Giulio Andreini <g.andreini@gmail.com>
Co-authored-by: Omar Ajoue <krynble@gmail.com>

packages/cli/test/shared/ExternalSecrets/utils.ts

@@ -0,0 +1,215 @@
+import { SecretsProvider } from '@/Interfaces';
+import type { SecretsProviderSettings, SecretsProviderState } from '@/Interfaces';
+import type { IDataObject, INodeProperties } from 'n8n-workflow';
+
+export class MockProviders {
+	providers: Record<string, { new (): SecretsProvider }> = {
+		dummy: DummyProvider,
+	};
+
+	setProviders(providers: Record<string, { new (): SecretsProvider }>) {
+		this.providers = providers;
+	}
+
+	getProvider(name: string): { new (): SecretsProvider } | null {
+		return this.providers[name] ?? null;
+	}
+
+	hasProvider(name: string) {
+		return name in this.providers;
+	}
+
+	getAllProviders() {
+		return this.providers;
+	}
+}
+
+export class DummyProvider extends SecretsProvider {
+	properties: INodeProperties[] = [
+		{
+			name: 'username',
+			displayName: 'Username',
+			type: 'string',
+			default: '',
+			required: true,
+		},
+		{
+			name: 'other',
+			displayName: 'Other',
+			type: 'string',
+			default: '',
+		},
+		{
+			name: 'password',
+			displayName: 'Password',
+			type: 'string',
+			default: '',
+			typeOptions: {
+				password: true,
+			},
+		},
+	];
+
+	secrets: Record<string, string> = {};
+
+	displayName = 'Dummy Provider';
+
+	name = 'dummy';
+
+	state: SecretsProviderState = 'initializing';
+
+	_updateSecrets: Record<string, string> = {
+		test1: 'value1',
+		test2: 'value2',
+	};
+
+	async init(settings: SecretsProviderSettings<IDataObject>): Promise<void> {}
+
+	async connect(): Promise<void> {
+		this.state = 'connected';
+	}
+
+	async disconnect(): Promise<void> {}
+
+	async update(): Promise<void> {
+		this.secrets = this._updateSecrets;
+	}
+
+	async test(): Promise<[boolean] | [boolean, string]> {
+		return [true];
+	}
+
+	getSecret(name: string): IDataObject | undefined {
+		return this.secrets[name] as unknown as IDataObject | undefined;
+	}
+
+	hasSecret(name: string): boolean {
+		return name in this.secrets;
+	}
+
+	getSecretNames(): string[] {
+		return Object.keys(this.secrets);
+	}
+}
+
+export class ErrorProvider extends SecretsProvider {
+	secrets: Record<string, string> = {};
+
+	displayName = 'Error Provider';
+
+	name = 'dummy';
+
+	state: SecretsProviderState = 'initializing';
+
+	async init(settings: SecretsProviderSettings<IDataObject>): Promise<void> {
+		throw new Error();
+	}
+
+	async connect(): Promise<void> {
+		this.state = 'error';
+		throw new Error();
+	}
+
+	async disconnect(): Promise<void> {
+		throw new Error();
+	}
+
+	async update(): Promise<void> {
+		throw new Error();
+	}
+
+	async test(): Promise<[boolean] | [boolean, string]> {
+		throw new Error();
+	}
+
+	getSecret(name: string): IDataObject | undefined {
+		throw new Error();
+	}
+
+	hasSecret(name: string): boolean {
+		throw new Error();
+	}
+
+	getSecretNames(): string[] {
+		throw new Error();
+	}
+}
+
+export class FailedProvider extends SecretsProvider {
+	secrets: Record<string, string> = {};
+
+	displayName = 'Failed Provider';
+
+	name = 'dummy';
+
+	state: SecretsProviderState = 'initializing';
+
+	async init(settings: SecretsProviderSettings<IDataObject>): Promise<void> {}
+
+	async connect(): Promise<void> {
+		this.state = 'error';
+	}
+
+	async disconnect(): Promise<void> {}
+
+	async update(): Promise<void> {}
+
+	async test(): Promise<[boolean] | [boolean, string]> {
+		return [true];
+	}
+
+	getSecret(name: string): IDataObject | undefined {
+		return this.secrets[name] as unknown as IDataObject | undefined;
+	}
+
+	hasSecret(name: string): boolean {
+		return name in this.secrets;
+	}
+
+	getSecretNames(): string[] {
+		return Object.keys(this.secrets);
+	}
+}
+
+export class TestFailProvider extends SecretsProvider {
+	secrets: Record<string, string> = {};
+
+	displayName = 'Test Failed Provider';
+
+	name = 'dummy';
+
+	state: SecretsProviderState = 'initializing';
+
+	_updateSecrets: Record<string, string> = {
+		test1: 'value1',
+		test2: 'value2',
+	};
+
+	async init(settings: SecretsProviderSettings<IDataObject>): Promise<void> {}
+
+	async connect(): Promise<void> {
+		this.state = 'connected';
+	}
+
+	async disconnect(): Promise<void> {}
+
+	async update(): Promise<void> {
+		this.secrets = this._updateSecrets;
+	}
+
+	async test(): Promise<[boolean] | [boolean, string]> {
+		return [false];
+	}
+
+	getSecret(name: string): IDataObject | undefined {
+		return this.secrets[name] as unknown as IDataObject | undefined;
+	}
+
+	hasSecret(name: string): boolean {
+		return name in this.secrets;
+	}
+
+	getSecretNames(): string[] {
+		return Object.keys(this.secrets);
+	}
+}