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/src/ExternalSecrets/ExternalSecrets.controller.ee.ts

@@ -0,0 +1,102 @@
+import { Authorized, Get, Post, RestController } from '@/decorators';
+import { ExternalSecretsRequest } from '@/requests';
+import { NotFoundError } from '@/ResponseHelper';
+import { Response } from 'express';
+import { Service } from 'typedi';
+import { ProviderNotFoundError, ExternalSecretsService } from './ExternalSecrets.service.ee';
+
+@Service()
+@Authorized(['global', 'owner'])
+@RestController('/external-secrets')
+export class ExternalSecretsController {
+	constructor(private readonly secretsService: ExternalSecretsService) {}
+
+	@Get('/providers')
+	async getProviders() {
+		return this.secretsService.getProviders();
+	}
+
+	@Get('/providers/:provider')
+	async getProvider(req: ExternalSecretsRequest.GetProvider) {
+		const providerName = req.params.provider;
+		try {
+			return this.secretsService.getProvider(providerName);
+		} catch (e) {
+			if (e instanceof ProviderNotFoundError) {
+				throw new NotFoundError(`Could not find provider "${e.providerName}"`);
+			}
+			throw e;
+		}
+	}
+
+	@Post('/providers/:provider/test')
+	async testProviderSettings(req: ExternalSecretsRequest.TestProviderSettings, res: Response) {
+		const providerName = req.params.provider;
+		try {
+			const result = await this.secretsService.testProviderSettings(providerName, req.body);
+			if (result.success) {
+				res.statusCode = 200;
+			} else {
+				res.statusCode = 400;
+			}
+			return result;
+		} catch (e) {
+			if (e instanceof ProviderNotFoundError) {
+				throw new NotFoundError(`Could not find provider "${e.providerName}"`);
+			}
+			throw e;
+		}
+	}
+
+	@Post('/providers/:provider')
+	async setProviderSettings(req: ExternalSecretsRequest.SetProviderSettings) {
+		const providerName = req.params.provider;
+		try {
+			await this.secretsService.saveProviderSettings(providerName, req.body, req.user.id);
+		} catch (e) {
+			if (e instanceof ProviderNotFoundError) {
+				throw new NotFoundError(`Could not find provider "${e.providerName}"`);
+			}
+			throw e;
+		}
+		return {};
+	}
+
+	@Post('/providers/:provider/connect')
+	async setProviderConnected(req: ExternalSecretsRequest.SetProviderConnected) {
+		const providerName = req.params.provider;
+		try {
+			await this.secretsService.saveProviderConnected(providerName, req.body.connected);
+		} catch (e) {
+			if (e instanceof ProviderNotFoundError) {
+				throw new NotFoundError(`Could not find provider "${e.providerName}"`);
+			}
+			throw e;
+		}
+		return {};
+	}
+
+	@Post('/providers/:provider/update')
+	async updateProvider(req: ExternalSecretsRequest.UpdateProvider, res: Response) {
+		const providerName = req.params.provider;
+		try {
+			const resp = await this.secretsService.updateProvider(providerName);
+			if (resp) {
+				res.statusCode = 200;
+			} else {
+				res.statusCode = 400;
+			}
+			return { updated: resp };
+		} catch (e) {
+			if (e instanceof ProviderNotFoundError) {
+				throw new NotFoundError(`Could not find provider "${e.providerName}"`);
+			}
+			throw e;
+		}
+	}
+
+	@Get('/secrets')
+	getSecretNames() {
+		return this.secretsService.getAllSecrets();
+	}
+}