fix: add multi email transport system (#2942)

packages/trpc/server/admin-router/email-transport/update-email-transport.ts

@@ -0,0 +1,57 @@
+import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
+import {
+  decryptEmailTransportConfig,
+  EMAIL_TRANSPORT_SECRET_KEYS,
+  encryptEmailTransportConfig,
+  ZEmailTransportConfigSchema,
+} from '@documenso/lib/server-only/email/email-transport-config';
+import { prisma } from '@documenso/prisma';
+
+import { adminProcedure } from '../../trpc';
+import {
+  ZUpdateEmailTransportRequestSchema,
+  ZUpdateEmailTransportResponseSchema,
+} from './update-email-transport.types';
+
+export const updateEmailTransportRoute = adminProcedure
+  .input(ZUpdateEmailTransportRequestSchema)
+  .output(ZUpdateEmailTransportResponseSchema)
+  .mutation(async ({ input }) => {
+    const { id, data } = input;
+
+    const existing = await prisma.emailTransport.findUnique({
+      where: { id },
+    });
+
+    if (!existing) {
+      throw new AppError(AppErrorCode.NOT_FOUND, { message: 'Email transport not found' });
+    }
+
+    const existingConfig = decryptEmailTransportConfig(existing.config);
+
+    // Start from the incoming config; backfill empty secret fields from the existing
+    // config (only when the type is unchanged).
+    const merged: Record<string, unknown> = { ...data.config };
+
+    if (existingConfig.type === data.config.type) {
+      for (const key of EMAIL_TRANSPORT_SECRET_KEYS) {
+        const incoming = (data.config as Record<string, unknown>)[key];
+        if (incoming === undefined || incoming === '') {
+          merged[key] = (existingConfig as Record<string, unknown>)[key];
+        }
+      }
+    }
+
+    const config = ZEmailTransportConfigSchema.parse(merged);
+
+    await prisma.emailTransport.update({
+      where: { id },
+      data: {
+        name: data.name,
+        type: config.type,
+        fromName: data.fromName,
+        fromAddress: data.fromAddress,
+        config: encryptEmailTransportConfig(config),
+      },
+    });
+  });