feat: support embedded authoring for creation (#1741)

Adds support for creating documents and templates
using our embed components.

Support is super primitive at the moment and is being polished.

packages/trpc/server/embedding-router/verify-embedding-presign-token.ts

@@ -0,0 +1,36 @@
+import { AppError, AppErrorCode } from '@documenso/lib/errors/app-error';
+import { verifyEmbeddingPresignToken } from '@documenso/lib/server-only/embedding-presign/verify-embedding-presign-token';
+
+import { procedure } from '../trpc';
+import {
+  ZVerifyEmbeddingPresignTokenRequestSchema,
+  ZVerifyEmbeddingPresignTokenResponseSchema,
+  verifyEmbeddingPresignTokenMeta,
+} from './verify-embedding-presign-token.types';
+
+/**
+ * Public route.
+ */
+export const verifyEmbeddingPresignTokenRoute = procedure
+  .meta(verifyEmbeddingPresignTokenMeta)
+  .input(ZVerifyEmbeddingPresignTokenRequestSchema)
+  .output(ZVerifyEmbeddingPresignTokenResponseSchema)
+  .mutation(async ({ input }) => {
+    try {
+      const { token } = input;
+
+      const apiToken = await verifyEmbeddingPresignToken({
+        token,
+      }).catch(() => null);
+
+      return { success: !!apiToken };
+    } catch (error) {
+      if (error instanceof AppError) {
+        throw error;
+      }
+
+      throw new AppError(AppErrorCode.UNKNOWN_ERROR, {
+        message: 'Failed to verify embedding presign token',
+      });
+    }
+  });